landsat-1 and landsat-2 flight evaluation report · pdf filelandsat-1 and landsat-2:":r_...
TRANSCRIPT
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__-:_ _'""'_ _ _"_ " _ 77SOS 4244-- - 22" AUG 1977
m Documentation Branch_r., Code 256.0
LANDSAT-1 AND LANDSAT-2::r
"_ FLIGHT EVALUATION REPORTc_
23 APRIL 1977 TO 23 JULY 19774a ,;_
1 UU_f-_ I-.,1.41..
• ,-,_ PreparedByu_ ¢_ 4J L)V
.z_ GE LANDSATOPERATIONSCONTROLCENTERt-1 L4 I_
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"__ _ For,r-- f,jt 1;:;1 q)_ .- NATIONALAERONAUTICSAND SPACEADMINISTRATION
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o r. QocldardSpace Flight Center_ ,- \ Greenbelt Maryland20771Q I
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_ GENERAL_ ELECTRIC
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https://ntrs.nasa.gov/search.jsp?R=19780007600 2018-04-27T19:16:18+00:00Z
TABLE OF CONTENTS
Section P_ge
INTRODUCTION ........... . ........... vii
1 SUMMARY LANDSAT 1 OPERATIONS 1 1_ • • • • • • o e • • o • • • e
OP_BrrA_ _METERS ................... _--1
3 POWER SUBSYSTEM ..................... 3-1
4 &TT1TUDE CONTROL SUBSYSTEM ................. 4-1
5 COMMAND/CLOCK SUBSYSTEM ................. 5-1
6 TELEMETRY SUBSYSTEM ................... 6-1
7 ORBIT ADJUST SUBSYSTEM ................... 7-1
8 MAGNETIC MOMENT COMPENSATING ASSEMBLY ........... 8-1
9 UNIFIED S-BAND/PREMODULATION PROCESSOR ........... 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM ............... 10-1
;. II THERMAL SUBSYSTEM ..................... Ii-I
_ 12 NARROWBAND TAPE RECORDERS ................ 12-1
13 WIDEBAND TELEMETRY SUBSYSTEM 13-1• • e • • • • • • • • • • • •
14 ATTITUDE MEASUREMENT SENSOR 14-1
15 W]DEBAND VIDEO TAPE RECORDERS ............... 15-1
16 RETURN BEAM V]DICON .................... 16-1
-_ 17 MULTISPECTBAL SCANNER SUBSYSTEM .............. 17-1
_?_ 18 DATA COLLECTION SUBSYSTEM ................. 18-1
APPENDIX A: LANDSAT-1 ANOMALY LIST .................. A-1
APPENDIX B: LANDSAT-1 SPACECRAFT oRBrr REFERENCE TABLES ......... B-I
-++_APPENDIX C: LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD ......... C-I
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....,.i LIST OF ILLUSTRATIONS I
'. ,j. Figure Page
: 2-1 Effect of Orbit Adjusts on Landsat-lts Ground Track ......... 2-32-2 Local Mean Time of Descending Node ................ 2-5
! 2-3 Predicted Local Moan Time of Descending Node for Landsat-1 and Landsat-2 -
1976, 1977, 1978, 1979 .................... 2-6 [
:;'" 3-I Midday Solar Array Current .............. 3-2
'' , 3-2 IA (Midday) Degradation vs. Day; . _ i ............. 3-3 ['. 3-3 Actual/3 and _ (Paddle) Sun Angles. at 1 ............. 3-43-4 La_sat-1 Prt_llcted Bets. Angle, 1977, 1978, 1979 ........... 3-5
_' Landsat Free History (T 1 etry Vales)4-1 -I n e em u ............. 4-2 j
I4-2 landsat-I Pr6ssure - Boll Gate PMcflon ............. 4-3 *_o 4-3 Landsat-I Remaining Freon Life vs Gating Frequency .......... 4-4
5-1 Landsat-I Spacecraft Clock Drift History .............. 5-2 j5-2 Cumulative Clock Drift ................... 5-3
" 5-3 Drift Rate of Spacecraft Clock" .................. 5-3
°: 9-1 USB Power Output History (Landsat-1) ................ 9-2 [: 9-2 USB (Link 4) AGC Readings at Goldstone with 30' Antenna, Landsat-1 ..... 9-3
o,- II-i Landsat-I Sensory Ring Thermal Profile ............... 11-5
o,/ I
, ,: 13-1 WPA-2 (Link 3) AGC Readings at Goldstone with 30' Antenna - l._xlsat-I .... 13-3
..... 17-1 Computer Map of MSS Scenes for First Three Years Operation - Landsat-I . . . 17-3o ,
I" =_: 17-2 Scenes from End of Three-Year Period to Present Quarter - Landsat-I .... 17-5
: ]::, 17-3 Computer Map of MSS Scenes This Period - Landsai-I .......... 17-7
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I LIST OI.' TABLES
Table I_ag_
I 1-1 In-Orbit Payload _ystem Performance Launch Thru Orbit 25515 (7/27/77)Landsat-1 ......................... I -:_
| 2-1 Landsat-1 Brouwcr Mean Orbital Parameters ............. -'-7I 3-1 Landsat-1Major Power Subsystem Parameters ............ :_-_;
3-2 Landsat-IPower SubsystemAnalogTelemetry (AverageValueforData Received
| inNBTR Playback) .... C"y ................. :}-7.3-.I Landsat-1BatteryRestoration cles.............. " '
4-1 Landsat-1ACS Temperature and Pressure Telemetry Summary ....... 4-5
I 4-2 Landsat-1 ACS Voltages and Currents.. Duty" ; ; : ......... 4-64-3 Landsat-1 ACS Attitude Errors and Driver C el s ......... 4-6
5-1 Landsat-1 Command Clock Telemetry Summary ............ 5-4T
I 6-1 TLM Telemetry Summary .................... _]-17-i Landsat-iOrbitAdjustSummary ................ 7-:37-2 Landsat-10AS TelemetryValues ................. 7-5
II 6-1 MMCA Telemetry Summary (Landsat-1) ............... s-I
S-I Landsat-I USB/PMP Telemetry Values ............... 9-1
i0-I Lartd_at-IAPU Telem Functions ................ i0-I !
11-1 Landsat-1Thermal SubsystemAnalogTelemetry(AverageValue ofFrames forData ReceivedinNBTR Playback) ................. 11-:_
_ 11-2 Landsat-1CompensationLoad lllstory................ 11-612-1 NBR OperatingHours by Modes, Landsat-I ............ 12-112-2 Narrowband Tape RecorderTelemetryValues, Land;at-I ......... 12-1
I 13-1 Wideband ModulatorTelemetryValues,Landsat-I ........... 13-2
14-1 Landsat-1AMS Temperature Telemetry ............... 14-1
17-1 MSS Telemetry Values ..................... 17-D17-2 MSS Response Itistory Landsat-1 ................. 17-I(;
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INTRODU CTION
_ This is the 21st report in a continuing series of documents issued at launch, and quarterly, thereafWr topresent flight performance atmlyses of the Landsat-1 Spacecraft. Previously issued documents are:
._ 72SD4255 ERTS-1 Launch and Flight Activation 18 October 1972Evaluation Report 23 to 26 July 1972
72SD4262 ERTS=I Flight Evaluation Report 28 November 197223 ,July 1972 to 23 October 1972
72SD4224 ERTS-1 Flight Evaluation Report 27 February 197323 October 1972 to 23 January 1973
73SD4249 ERTS=I Flight Evaluation Report 29 May 197323 January 1973 to 23 April 1973
73SD4260 ERTS-1 Flight Evaluation Report 10 August 1973
! 23 April 1973 to 23 July 1973
'r, 73SD4274 ERTS-1 Flight Evaluation Report 28 November 1973-,, 23 July1973toOctober1973
ii 74SD4205 ERTS-1 Flight Evaluation Report 26 February 197423 October 1973 to 23 January 1974
> 74SD4217 ERTS-1 FlightEvaluationReport 18 May 1974,_: 23 January 1974 to 23 April 1974
_-"i 74SD4236 ERTS-1 Flight Evaluation Report 15 August 1974:' 23 April 1974 to 23 July 1974
74SD4255 ERTS-1 Flight Evaluation Report 31 December 1974_!;. 23 July 1974 to 23 October 1974
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•Yl 75SDS4222 Landsat-1 Flight Evaluation Report '}0 April 197523 October 1974 to 23 January 1975
75SDS4228 Landsat-1 and I_ndsat-2 Flight 15 August 1975Evaluatton Report
_=!', 23 January 1975 to 23 April 1975
75SDS4255 Landsat-1 and/andsat-2 Flight 10 October 1975'<" EvaluationReport, 23 April 1975 to 23 July 1975
:_' _ 75SDS4266 Landsat-iand Landsat-2Flight 1 Decemlx,r 1975< : Evaluation Reporto 23 July 1975 to 23 October 1975
.- ..,1 February 1976:7, 768DS4207 Landsat=land Landsat-2Flight '"EvaluationReport
"0 23 October 1975 to 23 January 1976
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76SDS4248 l_ndsat-t and Landsato3 Flight 14 July 1978Evaluation Report23 January 1976 to 23 April 1976
768DS4263 Iamdsat-1 and Landsat-2 Flight 15 October 1976Evaluation Report23 April 1976 to 23 July 1976
768DS4278 Landsat-1 and Landsat-2 Flight 30 November 1976Evaluation Report23 July 1976 to 23 October 1976
77SD84204 I.andeat-1 and I_andsat-2 Flight 22 February 1977Evaluation Report23 October 1976 to 23 January 1977
77SDS4228 l._sat-1 and IJandsat-2 Flight 23 May 1977Evaluation Report23 January 1977 to 23 April 1977
This report contains analyses of performance for Orbits 24193 to 25464.
viii 1,S- 1
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, l: I SECTION 1
SUMMARY
• _:-, LANDSAT-1 OPERATIONS
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'/"_ SECTION 1
(I_ SUMMARY LANDSAT-1 OPERATIONS
Landsat-1 continues to perform its mission nominally, and has completed 5 years of successful operation.
_ The I_ndsat-1 spacecraft was launched from the Western Test Range on 23 July 1972, at 18:08:06. 508Z.; _ The launch and orbital injection phase of the space flight was nominal and dcploymant of the spacecraft
followed predictions.
iI Orbital operations of the spacecraft and payload subsystems were satisfactory until Orbit 147, 3 August
i 1972, when an internal short circuit disabled one of the Wideband Video Tape Recorders (WBVTR-2). ""
_i In Orbit 196, 6 August 1972, the Return Beam Vidicon failed to respond when commanded off. The RBVwas commanded off via alternate commands. I_mdsat-1 continued to perform its imaging mission with
" the Multtspectral Scanner and the remaining Wideband Video Tape Recorder providing image data.
':}! The remaining Wideband Tape Recorder (WBVTR-1) experienced four suspensions of operation, the last_ being in Orbit 9881 on 2 July 1974, and has not been used operationally since.
: ii In Orbit 4396, 3 June 1973, an integrated circuit chip in the TMP failed, disabling four TLM functions.i!
o COi_LSTOR"B" has an intermittent problem with cell 12, and is not being used operationally.
:-" i_i The "B" section of the USB with full power output of 1.5 watts was substituted for the "A" section in Orbit: 10068 15 July 1974, because of excessive decline of transmitter power.
o _ The pitch flywheel stopped for 2 minutes in Orbit 8040, 20 February 1974; and for 8 hours, 2 minutes in,'_ Orbits 11125 to 11130, 29 Se_ember 1974. It has been kept close to zero speed ever since, using pitch-
•. . biascontrol.
o_i I) The RMP was switched from B to A In Orbit 11257, 8 October 1974, as a precautionary measure after. RMP B began showingcurrentvariations.
';":_ The DCS subsystem was turned off after Orbit 12690, 19 January 1975, and the function assumed by DCSin L_ndsat-2.
. _,iI _ Narrow Band Recorder 2 became noisy and was turned off in Orbit 13015, 12 February 1975. Operationof NBR 2 resumed in Orbit 14116, 2 May 1975, until failure in Orbit 15253, 22 Jtdy 1975, when its opcra-
_,.... tionwas terminated.
. _ Battery 6 was turned off from Orbits 13346, 7 March 1975, to 14100,30 April 1975, due to electrical char-o '_ acteristics causing high temperatures. Between Orbits 14780, 18 June 1975 and 15467, 6 August 1975,
:"_;' Battery6was turnedoff againdue tohightemperature. BecausehighcurrenttransientoccurredatBattery6 turn-oninOrbit15467,6 August1975,thebatteryturn-oncommand istemporarilysuspendedfrom use.
"._''!'"_ Sevenbatteriesremain on-llne.'!
_ The pitch flywheel stopped again for 45 minutes in Orbit 15309, 26 July 1975, and :1minutes in Orbit 15312,
: 'i 26 July 1975. Pitch flywheel motor driver duty cycle remained high from Orbit 15191, 18 July 1975 to_ _ Orbit 15393, 1 August 1975, when it returned to normal. MSS operation was suspended during the pitch, ' flywheel anomaly between Orbit 15:109, 26 July 1975, and 15393, 1 August 1975.
; "i,_:__ : Ii Battery 8 was turned off in Orbit 15588, 15 August 1975, due to electrical characteristics causing high. temperature and will not be returned to service because of the battery "ON" command problem. Six
°_, batteries remain on-line.
LS-I 1-1
00000001-TSA08
The roar ACS scanner had intermittent electrical failures beginning in Orbit 19078, 21 April 1976, and itfailed in Orbit 19088, 22 April 1976. The spacecraft was switched to single scanner mode (forward _eann_.r)in Orbit 19089° 22 April 1976, and normal ACS operation wan resumed.
A series of Orbit Adjust firings from October 20 to November 9, 1976; and from January 7 t_ Jantmry :.'_,1977 wore performed to adjust time phasing between Inndsat-1 and I_ndRat-2. 'rhlR al_o changed therepeat cycle pattern coverage of Landsat-1 and Landsat-2 from a 9 day/9 day to a 12 day/6 day coverage,.Landsat-1 wan designated non-operational from October 20, 1976 to January 28, 1977 while the orbit adjustsequ,.n,_,e was in progress.
Battery 5 turned off in Orbit 226o.5, 31 December 1976, duo to electrical characteristics causing hightemperaturt and will not h,, returned to _,,t'_ice because _f the batte_' "On" t,omnland problem. Fivebatteries r, nLain on line.
The position of the sun with respect to the Landeat 1 orbit after five years, cycles in and out of the sun-sensor detector response angle. The solar panels have tracked the sun with periodic offset errors and theresulting sun position and panel tracldng offset errors have reduced the solar array output. The solararl-ay, however, has supplied sufficient power for the spacecraft operation.
Sensors 1 through 6 (Band 1) of the MSS were turned off because of a power supply failure during Orbit23480 on 3 March 1977. The MSS is now operating with only 3 of its 4 spectral bands.
See Table 1-1 for a summary of payload in-orbit operation.
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Table 1-1. In-Orbit Payload System P,,rf,)rnmnco _umch Thru Orbit 25515 (7/27/77) Ltln,lm_t-I
.... lJ .....
IIBV Total Scones Imaged 1,69¢1
Avg. SconorqDay 139TotM Area Imaged (milllnnu of aq. n.mi.) 1,1.7
ON TIME (hr.) 14.0
ON/OFF Cyvlcm 91_,,',Real Time hnagoA 57
, % lieeordcd Imago8 .1:;
,q_ ,) ,#I_, ,_ Total Scenes Images .6., 772|
Avg. Sccne_/Day 1q;:_" Total Arcs Imaged (millions of sq. n. ml.) .,', _,m',,
ON TIME (hr.) 2. 713" ON/OFF Cycles 18,552
.t % Real Time Images 82/,_ Recorded Inl_es 18
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/ DCS Messages at OCC 1,152,045"_ " Non-Perfect MSGS 90,691/_} Max. DCP's ACTIVE/DAY 11.1
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. i Users 44°,I ' Avg. MSG/ACTIVE Orbit 181
t ON TIME (hr.) 21,820.2
?'l'l WPA-1 % Real Time Mode 55t % Playback Mode 45
ON TIME (hr.) 33. 2 it'_-_ ON/OFF Cycles :ll.l
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-i I WPA-2 % Real Time Mode 79": % P/B Mode 21
oNTIME(hr.) 2,G17':°el ON/OFF Cycles 16,304
:1 WBVTR-1 % Record Mode 38
. % Playback Mode 41
/_} % Rewind Mode 20
! ! ,_ % Standby Mode 1
-_ Minor Frame Sync Error Count in P/B (FailedOrbit 9,881)
:: . _ Time lleafl-Tape Contact (hr.) 732.8"" _ Cycles llcad-Tape Contact II,954
.... } ON TLME (hr.) 927.6
' =-,_!: C'
7til WBVTR-2 ,_ Record Mode 38% Playback Mode 41_ % Rewind Mode 20
"! " % Standby Mode 1: MI.'SE Count in P/B (I.'ailed Orbit 1.18)
_' " Time llead-Tape Contact (hr.) 5.1'_,, Cycles llead-Talm Contact 44:: , *t
i,_ : ON TIME (hr.) f;. 5
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-"' I SECTION 2ORBITAL PARAMETERS
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The initial orbit of I_Lndallt-1 r¢_quired nomv currocticn during ¢)rbitn 3h, .t.1, and 59 t4_achl_,w, the dt,r, lr_.dl_-day r_pcat cycle..
During Orbltn 9:IU, 2.lift, II;lllll and 782fi it wa_ necessary to fire tim -X lhrlmtt,r t_i tlw .rhlt adJurtt I_yl_l,,m
to maintain the ground trace in tht, desired Is-day rc,pl,at pattern of _ i c) vml.
On 29 September 1;174, the ACS control _y_tem flJ,c,d g_t_ during a _pacvcraft 4,nmrgvnt:y (pitch fl,vwhv_,lstoppage) which resulted in an unplan ,ed orbit change similar to firing the -X th_'u_tvr.
ID.*
The +X thruster was fired during Orbits 11367, 11.16.1, 13611, 197,17 and 1_,1S71ia order to ma|ntutn theIs-day repeat cycle ground trace within + 10 am.
A 101 day orbit adjust program commenced in Orbit 21613 (20 Oetoix_r 1976) and lasted through orbit 2:1_J07(28 January 1977). This program Increased the time separation between the I_ndsat spaceerafts by 12.17minutes to remain within the operational time limits for ga'ound station turn-around time to track the space-crafts in successive passes. Another consequence of the 101-day orbit-adjust program was the changt_ ofthe Landsat-1 - Landuat-2 combined earth coverage repeat cycle from a nine day - nine day _ehedulc to atwelve day - six day s_hedale; i.e., l_ndsat-2 will pass over a point on earth twelve days afk, r ]._ndsat-l_spassage. Six days after Landsat-2 crosses this point, Landsat-1 will pass over it again.
Current orbital parameters are given in Table 2-1.
Figure 2-1 shows the longitude error as a function of time and orbit maintenance burns, The longitudeerrors have been maintained within + 10 nm in the east-west direction at the equator as planned. Fi_,mr_.2-2 shows mean local time at the descending node. Figure 2-3 shows predicted mean time of descendingnode. Appendix B gives the ground trace repeat cycle predictions.
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ORB,TADJUST5,4T.ROU_.50ORB,T5_,B,_,_oOCT7B)TO23007 (28 JAN 77)
ENTERED 11/7ENTERED 10/8 CYCLE ENTERED 12/B
40 CYCLE CYCLE
_o _, ,,,v, , ,_, , ,\ , ,v , ,__ "10 X '_ '_ ORBIT NUMBER [
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ORBIT ORBIT 21 76 15 OV 76 15 DEC 76 1E JAN 77 /ADJUST ADJUST ACS CALENDAR /
NO. 6 NO. 7 GAS DUMP _ J
+6.20 +6.85 +6.53 _ C
A+"A A r iI I o u> I I I I / I CURRE_REPORTPERIODImlo_'ol.l /,I zm / J
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NO. 10 NC 1 NO. 13 J / NO. 51
I /:_._ I i i I i I I . I I I i I i I I I I I i i I i I i i I I i I i I I I I | I::3 2E 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 B7 El Bl 63 65 B7 69 71 73 75 77 79 81 83 BB 87 939B 97 99101
REPEAT CYCLES
""+. I | I I . I I I I I I +1 I I I I I I I I I i I I 1 I I I I 1 I I I I I I 1 1
: +38 8642 7648 8650 gB54 10658 11662 12666 13670 14674 15678 18682 17686 18690 19694 20698 21702 23208 24253 25238
REVOLUTIONS
Figure 2-1. Effect of Orbit Adjusts onLandsat-l_s GroundTrack
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POWER SUBSYSTEM (PWR)
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._ POWER SUBSYSTEM (P%%q_)
The solar array continued to provide excess energy for the payload and spacecraft load throughout this re-port period. Auxiliary loads dissipated the excess power above the batter3, and load requirements usingLandsat-1 power management procedures. The power subsystem is predicted to have adequate power through1977 for the present Landsat-1 payload usage schedule. No compensation loads were used.
Midday solar array current is shown in Figure 3-1. Figure 3-2 shows actual and predicted midday solar ar-my degradation. Solar array degradation was 35.9e,_ at the end of 60 months in orbit. Figure 3-3 shows actualsun angles to the spacecraft and solar panels. Figur_ 3-4 is a prediction of sun angle through 1977 for Land- _-
_ sat-I and 2.
Since August 30, 1975, the batteries have been kept slightly undercharged to avert the possible recurrence ofa run-away condition. Batteries 5, 6, and 8 were turned off as previously reported. These batteries will re-main off because of the "All Battery On" command restriction resulting from the anomaly reported previously.Five batteries are now supporting operations and are adequate for the current limited payload operations.Temperatures ranged from 15.4 to 31.3°C and battery packs averaged a typical 8.2_ Depth of Discharge(DOD) at the beginning of the report period and 10.3% (DO])) at the end of this report period. Table 3-3 is ao.
' history of Landsst-1 Battery restoration cycles and turn-off.
!_i_ The power system electronics per_orm_l well in this report period with all voltages stable. Table 3-1 showsmajor subsystem parameters and Table 3-2 shows power subsystem tel¢ _etry for selected orbits. Someparameters in Table 3-2 may differ slightly from Table 3-1, because T_ble 3-1 uses a power management
_' time span (night followed by a day); whereas, the time span used in Table 3-2 is the playback period for the
=_,.. NBR.
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Table 3-3. l,m_dt)at-1 Battery Rostoration Cveh,_
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I)ate 3-7-75 6-1_-75 3-2_-77: Batt 6
Orbit 1,t100 15,1U74 ,+On
Date 4-30-75 8-6-75| ......
Orbit t5588Off
: Date 8-15-75i,
Bati ,_ •' Orbit i_
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*Since "All Battery On" htgh eta'rent transient anomaly in/)ri)it 15467on 8-6-75 the "All Battery On" command is restricted. Batteries
::" turned off aftcr that date will remain off
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SECTION 4
ATTITUDE CONTROL SUBSYSTEM (ACS)- LANDSAT-I
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I SECTION 4 iATTITUDE CONTROL SYSTEM (ACS)
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During this report period, Landeat-l's ACS system performed normally in the Forward Single Scanner Mode.
J
Due to the large Beta angle, Landsat-l*s sur. sensors are sometimes unable to maintain solar array attitude, ' for maximum sun illumination. Landsat-l*s orbit has regressed with time and Beta angle (the angle betweez,
the orbit plane and the sun) has increased to a level that sometimes exceeds the sun sensors' fields of view.Figure 3-4 shows Beta angle plotted as a function of time. Tracking errors commenced when Beta was approxi-mately 46.5 o. Historically, solar array tracking errors first appeared in mid-January 1976 and lasted throughMarch .976. They reappeared in December 1976 and continued through Aprll 1977. The Right Solar ArrayDrive (RSAD) sun sensors were partlcularly affected.
.... During this report period, Pitch flywheel duty cycle was stable and averaged approximately 5% in both the clock-wise and counter clockwise directions.
With pneumatics diss.bled, no gating occurred. The remaining freon and gatlng status curves are unchanged.See Figures 4-1, 4-2 and 4-3.
i RMP I functioned normally.
The Forward Scanner pressure continues its slow decrease.
, Pressure/temperature ratios have all been satisfactory.
Tables 4-1, 4-2 and 4-3 are sununaries of telemetry values for Landsat-l's Attitude Control Subsystem.
LS-I 4-I
00000001-TSC02
_1 I l ' ' I I . Ii I '; i
4-4 _-I
00000001-TSC05
00000001-TSC06
!
ORZGV, PAGe;Poo QUALITyTable 4-2. Landaat-1 ACS Voltages and Currents
( _r|Ht
Funt'llOn L'mt_ ;11 5099 llll_,_ I.t_2f_1 2mllll 'I"192_ I,I_.I_ ] 2;ir15,j _:_-I
.... p.-,!, -Ilh_" ('l,ll lhlt_t'l" Nllmllll %-II_ TMV 2. N 2.7m 2.7_ 2.74 '.77 2.7m 2.77 2.77 _""
limlliMP | MTIt %¢)|I_ VDC OFF OFF OFF -:|ILl| -:Ifi,14 -:10014 -_ILI4 I -311.I,I i -3n._lI
I(I_2 lIMP | MTRC_trrcnt Anlps OF'F OFF OFF .It .II fill o. 11 i o, II _i (,.tl10so I(MP I Suppl.v. Volts VLK" OFF OFF OFF -2:1,7m -,|.7,'" q -23,77 -23.7s 23.7_ 'I -2:1.4,,
1/191 lIMP 2 ]tITR Volts VDC -29.7 -29,63 -29.G;I OFf.' O|:| o1:$ OFF ()|.'F (1t
1002 lIMP 2 MTII Currt,at Amps 0. Io o. Io (,. II ¢)FF (H:I.' (_l'l' OFF (Q'F ; ell.'
llffl(I liMP 2 Sttl_ply Volts VDC -2"t. 4 -Z3.41 -23. 5(1 OFF ()FF OF}" OFF' OFF OF "
I::Z0 SADRT MTR WNDNG Volts VDC -4._ -4.2S -3._9 -3._5 -4.20 - 3.70 - 3.0_ - 3.0s - 3.
13t0 SAD LT MTR WNDNG Vo|to VDC -4,_ -4.09 °3.30 -3. |3 -3.65 - 3,57 - 3.52 - 3.37 - 3.
1227 SAD RT -15 VDC Cony. VDC 14.9 14, _tJ 14. _9 11. _7 14. _7 14.05 14. _ 14. '_7 14.
1247 SAD LT -15 VDC Convo _.'IX" 15.2 15. 13 15. 14 13.01i 15.11 15.01_ 15.o9 15._ 15.
tOSh CLB +6 '¢DC 'L'_,|'¢ 2.4 2.35 .'. ;,:_ 2._|3 2°;[5 2.3,5 2.35 2.35 2.
I055 CLB + I0 VDC TMV TMV 2, 70 2.75 2.74 2.74 2. ?3 2.74 2. 73 2. 73 i%
Table 4-3. Landsat-1 ACS Attitude Errors and Driver Duty Cycles
' ]Orblt_ I
L_- i iF_nctlo_ Units 13191_ 13569 14001 15254 _'u.u_l 23_,_2_ • ,, _ _543,_J
l141Pltcl_Fine-Error" . DEG - 0.40 - 0.05 - 0.02 - 2.13 -.11 -0.7_ "_ * 0.o0 1
1143 P/tch Flywheel Sl_ed RPM - 10.49 - 26.86 - 1.21 12.92 -70.17 -36.04 -ol.05 I -61_.70 -$b. ol
1038 Pitch MTR DRVR CCW PCT 4.96 5. 81 4.55 3.2e ". 09 I. 10 2.45 2.7_ ! 1.73
1030 Pitch MTR DI_VI_ CW _CT 2.29 2.17 5.10 19.05 |..1 I1.:13 [ O. 29 0. 12 I O. 20
1030 Roll F/he Error.* DEG ..-.,""" - 0.20 - 0.20 - 2.:_ -_,Tn - 2.47 I - 1.4_ i " 2.7) ' - 2.5_i
1127 Roll Rear F|)_,hee| Speed RPM 715.7_ 7_.92 7_2._ 714.t15 7Jn.J.; 7114.71i 726._2 : 716.42 " 7_.,t2
I '1120 Roll Fwd Fll'wheel Speed IIPM 641. _2 074.4? 003.3! 641.112 64o. _, 030.05 048.01 640.21 640.2_
1022 Roll Rcar MTR DRVR CCW PCT 0. Ot o. 0_ o. 90 .13 .90 o. ()0 [ 0. OS i "0.00 ,. O(i
1025RoIIRoarMTRDRVRCW PCT 4.20 5.22 5.52 4.17 3.01 ,I._ i 5,04 i 4.99 : 4._
1023 Roll )_'d MTR DRVR CCW PCT o. 01 o. 66 o. 72 . o_ . !,9 I,.,H; I o. 04 i 0.(,1 0 ,:
1024 Roll F_.dMTRDRVRCW PCT 4.15 1.94 5.;15 L_'4 :,.t(_ 4.o¢.1 4.27 I 4.21 i 43_
1035 Yaw Tach RPM -206.0H -110.59 - 93.72 -169.52 -2l)ll._l| - I91.1tl -140.7,5 -217.2_ i -'_25,'2t[
1033 Yaw MTR DRVR CW PCT 0.04 1.53 l.q4 .09 .t,:_ u. ll 0.40 U, (1(] _ tLo,i
1034 Yaw MTR DItVR CCW PCT 0.07 1. riO I. 76 .0_ .l,7 0.r_4 ) 0.79 O. fl0 [ ,,. 7:
1221 _D Right Tilth DEG/M1N 0.37 3.37 2..It 3.37 [ ,_.4_, l.;m :1.41 3. 12 [ 3.,1_I i l i11241 SAD Left Ttch DI:G MIN 2,_fl 2, _1 2. _1 ;. 7!1 2.7, 2. ?4 '2.77 2.7_ ';. _i
Nt)'I l:: Tahulatl,.: .1 thclu., lunctiolm began alter thc pitch tl.'whcel lu.)mah (slop|_t.t|} n ¢)rhit ! 112.5.• Pitt'h t'll_t' t.rYIw i_ t'llgh tlUt'tu _t' t_1 |titt'h Ihtst_tt)l_l!t'|_.l_|I'I'BI t_ t,.r.trt,I Pitch _._ht,t,[ 8|a*t_tltt|_
mmlc orhlt_ %ddt.h raise, tilt. avcragt, crror al.mv_ thai of ll,)rnla] attltmh' x*tth*.tt I'lqt.
• ' lloll FIBt' l:rr,_r is high duu t_ u_e. uf Ihgb (lain It_dl lllfftTt'ldt,ll I .I, h,,I,_h ) t'l:llt I I , tllll*,: Iltdl_hcel tq_et'(| I_hlcl' l':ll_l,N 11,t' av¢'ragr i rl'l_l _tl_t,II that ,d |14II'llhtl:lttltuih in _,.I Ill.tJ I,_lll! lb,h |kith I' nit ,;
4-6 l.S-1
O0000001-TSC07
• ¢
" SECTION 5
COMMAND CLOCK SUBSYSTEM (CMD)
Z. LANDSAT-1
o
' i
w
7
00000001-TSC08
.3 t iw
:/t ._ I I ! ! ! i I.r.
f
SECTION B
..i COMMAND/CLOCK SUBSYSTEM (CMD)
The Command Clock Subsystem operated nominally in th_s report period. Figure 5-1 shows the history vf: the S/C clock drift since launch. Figure 5-2 shows the cumulative clock drift, 16,964 seconds slower in
60 months, and Figure 5-3 gives the drift rate of the S/C clock, an average of 0.666 msec slow per orbit.In this period, the drift rate is at the average rate of 0.094 msec slow per orbit. The clock in Landsat-1
: drifts in opposite direction from the clock of I_mdsat-2.
,_ Table 5-1 shows typical telemetry values since launch. All arc nominal.
° ;
o-'.:
° o .
. I I I f ,, I
o.
• , Z_Lt 8_0. _ b
| 99191 8_10,
°,-" _
. " ;
' _ ** _L_Z .LIS_O,'. , **
• I I I I I I i i I l I o
, 1I
O0000001-TSClO
I 1 ' t I I ' I
I 8 16,964IT 25465
_,..., 1614
10 _-.
_ 4 CURRE.T= 2 / R_F'ORT_RIOD/ I I I I I I I
. U 00 4 8 12 16 20 24 28
ORBIT (IN THOUSANDS)
:_. Figure 5-2. Cumulative Clock Drift
!=o), 1.2
'o_ __ 1.0
_ 0n,, 0.8
I-"1 CURRENT REPORT0.6 PERIOD
' 0.4
..... :" _ _ 0.094MSPERORBITr.
_': 0 I I I I I I I I
o- 0 4 8 12 16 20 24 28 ;!ORBIT (IN THOUSANDS) t
Figure 5-:_. Drift Irate of _paeecraft Clouk.oo ,°
'c, L_-I 3-3
v' _
O0000001-TSC11
!/q ORIGINALPAGE lti
OF POORQUALITY/
' Tablo 5-I, Landaat-I Command Clock Tolom_try fiummar_,
,>
" 5-4 LS- l
,2
++", > _ I ' I 1 ..................-................." • I , ..................................._............................................i=,..+.....+.,._..+.:,.+.,-+-+--_---+..--+,+o+: ............... ;_ ..i.i.2, ;,:++.... .,.++,+,,._.................+++................._ ....... ...++:+._........ r.......+ _ ........
_ -.........--,,--'--' • '.................. O0000001-TSCI:
' " SECTION 6 .
TELEMETRY SUBSYSTEM (TLM)LANDSAT-1
i
!
7
a •
6_
00000001-TS( 13
ORtINAh pAGI lfaOFveer QUA rt
ISECTION 6
TELEMETHY HUBHYSTEM (TLM)
Telemetry Sulmystom h/m performed nominally durlnl; tliit4 report pot'iCM,
Lrmdsat-t used Memory St, often 0.0 until Orbit 12,565, 10 January 1975, after whivh it war, rtqDrt,granmlvtl to
Memory Section I, I to be eolnpatll)h_ with Landtmt-2 ielemery nlatrl.x. Mt,tllOi,V Svo|toit I, ] v_mtJtl|l¢._r_bo used in the telemetry matrix.
Table 6-1 shows typical telemetry values since launch.
Table 6-1. TLM Telemetry Summary
Fut_et|on ( q'bdl,'auetlolt Name Unit
No.
35 5099 10592 15233 _.)._'""" 2.|fil_ 25050 2:,1:,:,
9001 Memory Sequencer A Converter _,q)C 6.32i (i. 33 Ii. 3:1 (l, 33 (h 3'! tl. 33 ii 33 i,. ;13
9002 Memory Sequencer B Converter VDC ** ** ¢* ** ** ,* ,* ,*
0003 Memory Sequenet, r Temp °C 19. :,9 21.06 21, 30 2 I. 94 :'-4.09 2it, _2 :2It. 90 '-'l. uu
9004 Formatter A Com'erter VDC 5, 99 5, 90 5, 99 5, 99 tl. IJ2 5.99 5.99 t,...
9005 Format B Cow..erter VDC *• ** * * *, ** •, , • ,,
9006 Dig. Mtix A Converter VDC 10.01 10.94 10.07 10.07 10.07 10.07 lit. o; ILL07
9007 Dig. Mux B Converter _,q3C ** ** ** ,, ** ** ,, ,.
9008 Formatter/Dig. Mttx Temp *C 22.50 2.t, t_9 '25, oo 23, 55 37..t) °7, 31 21;. 9t, 29, !t_)
9009 Analog Mux A Converter VDC 26.0 ! 21.11_ 2ft. 20 21...,' ' " 2ft. 35 2ft, :15 26.35 2b, 35
9010 Annlog Mux B Converter VDC *¢ ¢* ** ** ** ,, ,, ¢,
9011 A/D Converter A Voltage VDC ,0.00 t0.07 10.07 1o,07 10.07 10. tit 10.07 IlL q,7
9012 A/D Converter B Voltage VDC ** ** ** *_ ** ** ** .,
9013 Analog 1Mux A/D Converter Temp *(7 25.00 26. t_3 27..19 25.63 32.50 27. :1_ 27.47 21,. -1t_
9014 Preregulator A Voltage VDC 19, 93 19.95 19.94 19.98 20.00 19. _9 19. u9 19.93
9015 Preregulator B Voltage VDC ** ** ** ** ,, ,, ,, **
9016 Reprogrammer Temp "C 22. ott 22.50 22.53 22.50 32..lt_ 23.61 23.11 25. tJ:_
9017 Memory A Converter VDC 6. 00 5.99 6.00 5.97 6. O0 5.97 5.97 .,. 97
9018 Memory A Temp "C 17.51 17.50 17.50 17.50 19.92 16.83 16.69 17.50
9019 Memory B Converter VDC ** ** ** ** ,, ,, ,, ,,
9020 Memory B Temp *C 17.68 17.63 17.51 17.50 20.61 17.05 16.97 l 7.5 l
9100 Reflevted Power (Xmtr A) dBm 11.95 12.32 12.38 11.37 13.86 12.13 ll.7s 12.50
9101 Xmtr B -20 VDC VDC -19,75 -19.76 -19.75 -ltl, t_-| 10.75 -l!l. 7fi -19.75 -19.75
9102 Xmtr B -20 VDC VDC ** ** ** ** *, ** ** **
9103 Xmtr A Temp *C 20.95 21. 14 22.01 21.9H .11. !lt_ 25, 02 25. 17 29. :,_
9104 ._ntr BTemp "C 21.69 21.95 22.7fi 22.91 43. Io 27. I1 26.35 21o.u_
910_ Xmtr A Power output dBm 25. 12 25.35 25, 24 25. oo 25.10 2,1.7 ! 24.55 2 I, _i2
9106 Xmtr B Power Output dBm ** ** ** ** *, ** ** **
*Units not vsed since prelaunch
6-1/2
00000001-TSC14
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)LANDSAT-1
:1
O0000001-TSD01
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
The Orbit Adjust Subsystem has been fired 51 times, 26 times using the -X thruster and 25 times using the+X thruster.
The subsyetem pressure/temperature parameters continue to bc normal. There are 64.43 pounds ofhydrazine fuel remaining from an initial pro-launch load of 67.00 pounds. Figure 2-1 shows spacecraft
ground track drift from standard orbit tracks and the effects of orbit adjustment• T_ble 7-1 is a summary
of OAS performance to date, and Table 7-2 gives average telemetry values for the off (quiescent) state.
l
t
!
:, I_-I 7-I/2
" 00000001 -TSD02
i 1 1 t 1 ! ' I'i_i- _ 1 i_ 1
OP_GINAI_PAGE I_OFpoor QU,_Yt'Y
/i I 1 l t I ' I '
•' :.
m _. I
1,8-1 7-5 6
• ' ....... _'."_"_'_"_=_-... ..... _c:2&-_-_'-,Y":.",.Z- _'..:'_.-:_ ".'. ""L_ _:."......... _'-'_---_-':,_............... ..... _'_';_'_._.:-_..._.'.-', - ,"_'_.........;.. .... ,.?_-_--,,,, "- '--_ -='_:--_'_._. -............................._:,#__.=.,_ ...... ;, _:_. ,_:, .. 5 _
00000001-TSD05
5
=" SECTION 8
<' MAGNETIC _IOMENT COMPENSATING ASSEMBLY (MMCA)
:: LANDSAT-I
.t
r5'_
%' _
0000000]-TSD06
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA}
From launch through this report period Landsat-lVs MMCA has been energized eleven timcs in sevenorbits, i.e., Orbits 73, 85, 110, 220, 11181, 11185* and 11186*. The MMCA was opcraWd in tilt. early
orbits to reduce +Roll pneumatic gating. {*Energized 3 times in one orbit).
In Orbits 11181 and 11186, it was energized in the plus and minus Yaw dipole configuration respectively
in order to save freon gas by reducing the amplitudc of the Pitch flywhccl orbit frequency oscillation. Ina short successful test during Orbit 11185 the plus Roll dipole was temporarily energized to determint, if a
" positive roll dipole at the poles could unload the pitch flywheel. Upon test completion the Roll dipole was
returned to 500 pole-era.
No dipole adjustments were made during this report period.
The current dipole values are:
" Pitch +2950 Pole-Cm
" Roll -500 Polc-Cm
Yaw -3600 Pole-Cm
Telemetry Measurement shown in Table 8-1 shows that the dipoles are holding sk, ady without drift.
Table 8-1. MMCA Telemetry Summary (]_andsat-1)
Orbits
Number Name Units 35 _099 la}1_2 15254 20364 2292_ "401_ 25t#5_m 25t55i
4001 A1 BoardTemp °C 19.77 19.03 19.II 17-'59 16.69 18.05 15.50 15.f_(_ It;.14
: 4002 A2 Board Temp °C 23.5e4 23.05 2:1.13 21.83 21,05 22.26 21,.u_ 20. 17 _tl.,_,,
4003 Hall Current "rMv 3,41_ 3..Is 3.4s 3..17 3.,Is 3.47 3.47 3.47 3. t_
4004 Yaw Flux Density TMV :3.11 3.11 3.15 4.02 4,03 .1. I).1 l.t,4 4. |,-I 1.,,I4005 Pitch Flux Density TMV :3.13 2, 51 2,52 .."5". 2,52 2. .5". '2.52 .." ,J.c" 2. :,_
I 4l)00 Roll Flux Denstt_' TMV 3.19 3. 19 3. 2t} 3. 28 3.2s 3.2_ 3. 2_ :1.2_ :1._'
It
f
b,!
I
LS-I s-I�2
O0000001-TSD07
,r
• J
J
o,J
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'_ SECTION 9w
UNIFIED S-BAND/PRE MODU LATION PROCESSOR (USB/PMP)
• • I._NDSAT-1
6
&
¶
L _j
m_
m_
m_
,i°
i..... . i................ t ......... _ J.... _. J_ ................ _:...........
00000001-TSDO8
..-, SECTK)N I)
UNIFIED S-BAND/I_I_EM(IDULATI(_N PROCEt4SoR (USI_ / PM P)
The USB Subsystem l_rformed all functio'ts nominally during this pcricxl.
Table 9-1 shows telemetry values since launch. All are non_lnal,
?: Figure 9-I shows the USII l_wcr outlmt history since launch, l.'ig_tt_ !)-'2 shows AGC readings atC,oldstone for a constant reference orbit in each cycle since launch.. '111_scatter of data pointsreflect variations in fl_e ground station calibration and readout.
%,i : Table 9-1. Landsat-1 USB/1)MP Telemetry Values
i i
i ";_'_' ...... . Functions Orbit" '
i : _ No. Name !Units 35 5099 10592 15233 20364 2292_ 24611_ 25050 2.5456i.
11001 USBRcvr AGe DBM -122.78 -131.99 -129. t$1 -lO5.41-132.06-127.95 -121*.62 -121%93 -126,09o,
.' 11002 USB Xmtr Ihvr WTS 1.60 0.29 1.54 1.53 1.56 1.56 1.53 1.5(; 1.44
_dr11003 USBRcvr Error KqIZ 21.79 -21.32 -23.25 -lg.01 -21.7(; -21.44 -21.94 -'2'2.44 -23. o2
:,_; 11004 USB Xpond Temp DGC 22.92 22.64 _ 25.64 25.11 25.37 37.31 21;.61 26.51 2_,..59
lu. ,). 15.94 :tO 16. 16. t)t! 16. I16 16. 19:i _,::;i 11005 USB Xpond Press PSI 15.91 15.91 " ' " 15. 72
¢_ 11007 USBXmtrA-15V VDC -15.20 -15.20 ** ** ** ** ** ** **
i,_. 11008 USBXmtr 1_-15V VDC +* ** -15.20 -15.21_ -15.20 -16.21_ -15.20 -15.211 -15.?t)
!:i_!,i' 11109 USBRange-I5V X_C -14.76 -14.76 -14.5_ -14.6s -14.5s -14.6_ -14.5._ -14.5,_ -14.5_=.
11101 PMP I_¢¢rA Volt VDC -15.12 -15.1S ** "* ** '* ** ** **
i . o.
i ° " 11102 PMP l_r BVoK _C ** ** -15.12 -15.12 -15.12 -15.11 -1,%12 -15.10 -15.12o
i-
.... : 11103 PMP Temp A DGC 30.44 30.23 26.6o 2ft. 0t, 26.6'2 43.53 2,% tt_ 2_,. fie 32. ,;7
i! 11104 I_MPTemp B DGC ** *¢ 31.64 31.67 31.12 47.5s 33.39 33.21 37. fM
.=
; : **Units Not in Use
ti:: /
} _?• .
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" " " " ....... ' " '...... 00000001__TL''1.[l/OijU=
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O0000001-TSDIO
SECTION 10
ELECTRICAL INTERFACE SUBSYSTEM (EIS)" LANDSAT-I
<,
a .
,', • o
%1;,, • ,
•,. Q =
,, " ,, _. ',, .,_.,,, " .. . . . ' ..." ' i_ " . . _ o . ' . , , ",,,.', ,',_." " _,,:.:_,",__,. ,, ,_',°T _, °" , ', , . t. ,,, _'
00000001-TSD12
_ECTION t 13
ELECTlilCA I, 1NTEI:tI,'A('I", HUBSYWI'EM (I';!_)
AuMliavy Proeestsing Unit {AIPU) t,onHlstlng of 8eavt,h Travk Data, Tlnu, Code Dttttl, m_d l_..kup 'lim(.v:,,
operated satisfactorily th/'t)nghout thlt_ ceport period. Tplt, rmq 'y for th(: APU its tfla_)',vn m TI,Idp 10-1. 'l'hoAPU Its In Normal mode,
Table lit-l, l,mldsat-1 APU Tt,lt,mt,tr_' l:unotlo,mt
( Wl)lt .................................. i
I ....
'_ qll ) I ¢) O11_20(I AI't', -2,l,r_ VIII.' -2.1,!)111 -2.|.!1(1 -21.!H -21 !Jr) -.I,, 11 _..1.30 ] -.4.8,1 I -.4._3 -2,1._'!1VI)C . !
13')01 APt', -12 VDt' =I2. lls -12,11_ -12.07 -12.0H =I').0") [ -12,1)5 [ -12.08 1 l,) (,r, -12. o.Volta
"' I I I.h. __ 35. :|;') .....132(12 AI)U Tt, nlp. LK;L' ..)..|,1 ')(1.115 27.15 ')' " 27.31 27.57 27.113 ')S ')q
The Power Switching Module (PSM), containing the switching relays for prover to Oroit Adjust, MSS. \_BVTIt
No. I and No. 2., RBV and PRM, functioned normally. The 1_I88 power circuits have been operating on _t
reffular basis throughout this report lx_riod. The power relay for tile RBV remained in a failed clo_t)tl t.t)n-dition since Orbit 196.
The Interface Witching Module (1SM) performed all switching normally during this report lx, viod.
ORIGINAL PAGm ml
. OF POOR QUALI'_
,i
LS-I II)-l, '
7
|• .=
0000000q-TSDq 3
" SECTION II
THERMAL SUBSYSTEM (TIIM)
, [ LANDSAT- 1
.t
L
,It
O0000001-TSD14
SECTION 11
TtIERMAL SUBSYSTEM (TItM)
The "l_crmal Subsystem continues to operate satisfactorily.
Since the time of launch, the right sun sensor on Laadsat-1 has registered temperatures higher thanexpcctcd. This is due to the p_ "ttcular location and bonding techniques used for the sensor. DuringOrbit 4396 (3 June 1973) telemetry function 7101 (TItM 'I2-I07ST1) became disabled when fo'_rtelemetr_ gates mounted on one integrated circuit chip failed.
Landsat-1 experiences an annual cycle of high and low temperatures due to a combination of high sunintensity and sun _ngle, and to longer satellite days. The cycles of sun angle and length of satelliteday reach higher and higher peaks in successive years due to the drift in the satellitets orbital plane.During February 1977, Landsat-1 experienced high temperatures, especially along bays 11 through 17,which are normally warmer than others.
During this report period the sun intensity ranged between 0. 989 and 0.969 of the mean annual valueand the spacecraft temperatures decreased. Figure 11-1 shows a typical thermal profile for averagebay temperatures of the sensory ring at the end of this report period.
Table 11-1 shows average analog telemetry values from data recorded on the NBR, for selectedorbits since launch.
The compensation load configuration on Landsat-1 has been switched several times to balance tem-peratures among spacecraft components. A history of compensation load switching is given inTable 11-2.
LS-1 11-1 2
........... o ......................... ,, .; .... . ". _"k'V'" J ot ........... :.o°.°',:,.o °o _;%"o _, ,
00000001-TSE01
00000001-TSE02
i/ I 1 ! ", I I , It
OF POORQ__
........ _ ".-'.--T'--_3 p"_'" ..... " ...... "....... - ...... -"............ _: " " ... J ..... , "Y-.-._?.'. .... .i'. ;,: .. " " __°_:""
00000001-TSE03
-^ot , ...... ...... ....... ..... ..... ...... : ...... ...... ::: ....... : ..... .....
00000001-TSE04
t ', I I I '., I
ORIGINAL PAGE I5OF POOR QUALITY
Table11-2, Landaat-1CompensationLoad History
CompensationLoad Status*
Orbits 1 2 3 4 5 0 7 8
Launch 0 0 0 0 0 0 0 0
2 0 0 x x x. 0 x x
6 x x x x x 0 x x
118 0 0 0 0 0 _J 0 0
156 x x x x x 0 x x
194 0 0 0 0 0 0 0 0
197 x x x x x 0 x x
701 x x 0 x x 0 x x
1410 x x 0 x x 0 0 x
3484 x x x x x 0 0 x
3644 x x 0 x x 0 0 x
3646 x x x x x 0 0 x
4177 x x 0 x x 0 0 x
6872 x x x x x 0 0 x
6966 x x 0 x x 0 0 x
8291 x x x x x 0 0 x
8348 x x 0 x x 0 0 x
8449 x x x x x 0 0 x
8472 x x 0 x x 0 0 x
8538 x x x x x o o x
8928 x x 0 x x 0 0 x
9898 x x x x x 0 0 x
10410 x x 0 x x 0 0 x
11125 0 0 0 0 0 0 0 0
11126 x x 0 x x 0 0 x
11127 0 0 0 0 0 0 0 0
11133 x x 0 x x 0 0 x
12604 x x x x x o 0 x
13206 x x 0 x x 0 0 0
15584 x x 0 0 x 0 o o
22487 x x 0 0 0 0 o o
23113 0 0 o o o o o o
*Note: x ._ ON; 0 OFF
I.S-j
,................. ,_........... 1............... _ ...... : ....... / _............... _........ : ......
00000001-TSE05
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I t2.
4,
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oY
_" I SECTION12NARROWBANDTAPE RECORDERS (NBR)
LANDSAT-I
t
I
-_?: .!
\
00000001-TSE06
1 + I ) It , i
SECTION 12
NAIiROW BAND TAPE RECORDERS (NBR)
Narrowband Recordcr-A operated satisfactorily during this report period, and llas provldcd coverage tor
MSS real-time operations ,as well as approximately 3-1/2 hours dally of normal orbital telemetry recording
and playback functions.
Table 12-1 gives cumulative operating hours for both recorders by modes, mid Table 12-2 gives typical tele-
metxT values.
Table 12-1. NBR Operating ltours by Modes, I_ndsat-1
NBR ON OFF Playback Record
A 17,980 25, 960 722 17, 258
B* 11,909 12,666 476 11,433
* Not used since Orbit 15, 25:_, 22 July 1975
Table 12-2. Narrowband Tape Recorder Telemetry Values, Landsat-1
Functlo_ Typical Telemetry Values - c )rbits
3730-
...J.H 24615 25036 2._36_No. Name 6 "1751 111e$02 15-':++; _o;J75 +'_'"
10001 A - Motor Cur. (ma)Record 190, I0 189, 20 186, 31 192.63 l'.ll_. 2O 1 _3.26 1 _4.34 1_6.2o 1 _3.21_
P/B 180,00 178.69 18(L 00 N.A. 102. (i0 18(141 lS6.41 178.30 1!,_. 41
10101 B - Motor Cur. (ma)Rcoord l!)'l. 26 lt;.+l,o+t 198.9;_ ltlP(. !h-) * + * * *
.)].°P/B 188.18 185.44 187. _(.I " '_ I + * * + +
10002 A - Ihvr _up. Cur. (ma)Record 3"+0. _'d; 3;;8.2(t 3:it,. 81 31:;.2.1 :H;;.-o [{HL l_J 343.1'+ 343.24 341.74
P/B 535.78 568.38 7_;7.7.', N. A+ 572. tit, 570.97 7)67. ,tit 569.4, 7,76.97
10102 B - I_vr Sup. Cur. (ma)Record 317,02 336,05 :_'dL (It) 3.16,75 * " * *
PiB 570, 78 55;1. (13 7d;7.50 5++0.7)1 * " * *
22..b '-'210003 A - Ik'c°Temp. (DGC) .."5.17 3.1.40 23.t_u 22Jm 21m._u 2o. 4"| 2'2.o2 ,, . _-
101(13 P, - lit,('. TomlL (IK;C) 21.5_ 2;I. 11 23.+tl 2;Lla 1%.|o 21.2,; 17.42, 17.;,:_ l..4t_
1000-| A - 8uppl+v (VDC) -2 l+ 17 -24.1.1 ' "_ -2 t.1+2 h 1,o -24. -24. ;,h -24. _,7 - 24.5-
101Ill II - SUl)l)l 5 (VI)L') -21.,1| -21+7)1 -21.2!) -21.+,7 -21.?q, -21.71 24.71 -':4.71 -24.7:_
N.A. - Data not avallahk,+ - Nt) data. NBIt-B t)t|t t)| +.)L,l+vict'
i
" ';,":':-'_'-" "+++-Tw"+%+'_"_'X+_-_-:++ +-'++.'=+:'::'=:-_', .... +:__._:+>.:,___'_-".?- ��5œ�<�-=--:'--++:,_-:+,:::..__=_<++-:__;::-_-+-.... + + :-- ,-._.+0:+ .+ "+ • + , ,:, ,+. ,,,,_ .....' : ++_:. . - ..... _+_ _ . .,,L ,+ •.... + , , , , .
0000000] -TSE07
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WIDEBAND TELEMETRY SU BSYSTEM (WBTS)
• !- LANDSAT-I
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00000001-TSEO8
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i'_ . SECTION 13
! WIDEBAND TELEMETRY SUBSYSTEM (WBTS)°_"; 1
i The Wldeband Telemetry Subsystem hlts operated nominally in this report pc,rlod., ,' Table 13-ishows typicaltelemetryvaluessincelaunch. Allarc nominal.
_ ' 'I statlonFigurecallbr_tlon13"listheAGCandreadout•hlst°ryatGoldstone. The scatterofdatapointsreflectswLrlationsIntlu,gr.und
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00000001-TSE11
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' SECTION 14
:_:' ATTITUDE MEASUREM ENT SENSOR (AMS):::;! LAI_SAT-I
I
_ ,
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O0000001-TSE12
I 1 I Ir i I
HECTION I,I
ATTITUDE MEA,S'UREMENT HYHTE.M lAMt'il
The AMS sulmvntcm was la,.mehed In the OFF mode trod energized in lit'bit II. I11-_Ilt'l'l'H'lll_llll 'l' I-,ill('l'Orbit II im_ heen without Incident. Attitude measurements mnth_ with tim AM! ,trl; ill I-_)lbll II}._l'l.'(tlll{'lll
t with AC8 fine _lttitudo error me:murcmelJt_,ITable 14-1 gives typical AMS tole.ntctrv valut_n. All :ire. n_m_hml.
t Table 14-1. l,nndsat-1 AMS Tempernture 'l't.lcmetrv
i ()rbttu!
.2J._ 2461_ !
4
Function Description Units 31 5099 101 _2 15254 20364 '_', ', °,Sq_.,u " ....
t 3004 Case-Tempi DGC 18.92 19.42 19.71 1_.54 1_.23 19.5'J 17.112 11;._.. 17.2-t
3005 Asseml)ly-Temp2 DGC 19.15 19.76 19.96 1_.73 1,_.51 11_.9u 17.24 17._3 17..',.1
.i
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F
00000001-TSE13
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS 6VBVTR)LANDSAT-I
O0000001-TSE14
I I ' 'i I l , _ I
SECTION 15
WIDEBAND VIDEO TAPE RECORDERS (WBVTR)
WBVTR-2 has not boon operat_i since its failure in Orbit 1,i8, 3 August 1972.
WBVTR-1 wa_ removed fa'om operational service aRcr Orbit 9881p 2 July t974, because of high minorframe my'noerror counts. The recorder has remained inactive since suspension of cn_'tnecrhlg testsafter Orbit 10861, 10 September 1974.
LS-I 15-1/2
00000001-TSF01
• !.
...._ SECTION 16 .
• RETURN BEAM VIDICON (RBV)- i?oS I._IM3AT-1
o
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SECTION 16
RETURN BEAM VIDICON (RBV)
The RBV has not been reactivatedsince Orbit 196, but itiscapable of o,_eratlonthrough individual
component power switching. An assessment of the RBV performance was _[vcn in ERTS-I FlightEvalua-
tlon Report 2;3July to 23 October 1972.
' I
.1
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SECTION 17
* MU LTISPECTRAL SCANNER SUBSYSTEI_I _ISS)
__ '-. LANDSAT-I
o
t
00000001-TSF04
SECTION i 7
MUI.TtSI_ECTRAI. SCANNEII SUI_SYSTEM (MSS)
'Hie XISS Suhsystem is now operating in only three of its four Slmctral hands, all above u. fi micr_J-meters wave length. Band 1 (0. 5 to o. d m|cronleters), tile g,t'eeli band, was turned .ff heeause _Jla fqilure, probal_lv in tile ±lSV power supply, on March 3, 1_a77during Orhtt 234_.
t)_ I '¢MS8 was returned to service, 3 bands only, during Orbit .3,H_,D.n 7 April 11J77. The Cal I,ampcurrent shows a drop from 1.12 to 1. lo TMV. but this telemetry point ruflucts grt_und returnsfrom other current to cause this apparent drop. Computer printouts of sensor response tt_ eal1.'m_pgeneration of the eal wedge show identical response lovel before and after the failure. °lhe19 VDC supply shows a rise of 70 ms, consistent with the hvpothesls of a partial short in thc_ .15VDC power suppl_'.
Fig:tre 17-1 shows the number of scenes imaged at each geographical location in he first threevear.q of operation. Figure 17-2 shows the numl_r of scenes imaged since the first three _,ears.Figure 17-3 shows scenes imaged in this report l_riod. In these maps, only those se_nesreceived b_' tI. 8. ground stations are showr,. Scenes transmitted to Canada. Brazil m_d Italy(44'; of totall are not shown.
Table 17-1. shows typical _I8$ TelemetPy Values fo_' this Pepopt pm-iod. Table 17-2 shows tile histor_ ofsensor :'esponse to a constant tnlxtt _'adtanee level. Each sensoP is sampled at .5Padi,'mee levels, andall ._how essentially tl_e same trends. Only one of these levels (the second highest) is listed inTable 17-2. Sensor" 20 has declined most (24C) since launch. "I'l:is is twice the avePa_e sensm" decline.
Line lenlzth history is also shown in Table 17-2.
&m calibrations, pePformed every two weeks, continue to show nominal l_ePtbrmanee.
I.S-I 17 1,'=
00000001-TSF05
i ..... \
..........................i...........;...._......_ __i_......._ _ ............i.:,,:.. :..............!..:........ "_:.:_:_:_:._!_:_*.1_*_r_r :_._,_::,:.._:,_,:._:,_:,:_:,_:,........... i
4_
1 "'".............................................,..,..,............,,..,o.,.,.,,,..._.---.----"------'---•---"•- -" .-" _- . . - i-:.
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00000001-TSF06
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i Figure 17-1. Computer Map of M,'-;SScenes for
First Three Years (;1_eration - l.:mdsat-I ]_ OF I_OR Ol'Ahl'r,/
Q : _: " •...... TII II_"-_ " I"F-'_IIII'T
O000000]-TSF07
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f ::::::::::::::::::::::::::: ... ;::_..-;;.:1.
...o. ........... . ..o .... _ _* **¢ "'s *_
ORIGINAL PAGE lb
OF POOR QUALITY
_ . ,____........ o........., _r I11l'J'lJ-LL I ,!:-"_','_'::;_i
00000001-TSF08
• o
_o.oo..ooo.o.....o. ............ ..........
+ 'io 1_+ *+
+:_ |o,, ,+,, .o..,+ *.+,,',+,,''d,,t .,, .o. "+ +
,++-
i "t+.
+:'_ i ?i".iti .-+
*.+++.,+
*++.
. .+o_L+._ + ++++1.._1._..... +l,+.+t+*tt_............................................................. -k %. ................................. ....................................... +
Figure 17-2. Scenes frum End tff 'l'hrec-Year
Period to Present Quarter - Lantlsat-1
I_-1 17-:,, fi J
, OPUGNALP,4GI_/_OF POOR QUALI'I'y
00000001-TSF09
• " ;, Ft
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+: _ +++- +°.o..°.*+.o+°°.+
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+++:.-::+_++:+_--_ ........ -+_..... , ..... + o+ + ....... +++,_+:........... +..... ++..... + + ++ + .... - ++ - ....
O0000001-TSF10
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TgT&_l lbl_ 3t70 tT_) t_qb t_b
i,: ORIGINAL PAGI_lbOF POOR QUALITY
00000001-TSF11
I ) !I _ ,
1+,,
L:- t_, l Table 17-1, MSS Tolomutrv \':tluu_
Tahh_' 17-2. .M,%_ Ih,_lmn_t' Ili_toKy ].'md_nt-I
(Juanttmt L,t, vt, J [or _t_,l_.ctt,d Weird ((J Blacl_: 113 _,Vhlt_,)
_----_l_t Yt,.'u' D _;.Jn(I 3'_,_lrlP q:Wd V,,10r-lm, W'--ltl_ YoaJ,-Ii.11-_:,lh Y_,;_v_-D ' ('hg.- ' 'l'lthi 511t;"t'
Iktlld _,.lllfl{)l' I,l|Ullt-'ll 2-'1 (ttllLI °, ,_-h (_ltitil'o _J- l;. _ (_IIILI °. |',l-li; Idlllll', 17" 19 (LIIlal', {_I.IlIFI(/!' lditllli'h
1 ,13 :19 39 :l_ it7 :_',
2 t.t 311 10 to 39 ;;n, 5 pi IWI' l{
;1 13 :1_ ,11) lib :19 :L_*.,_:_l'lq'l)f
1 I Ill 3½ ;19 3il :1_ 117o;P
5 ,tl :16 :15 ill :12 31 I,A I,l,,I I
6 ,t3 119 .11 ,11 ,I 0 :_9
7 .t7 .t3 t3 12 ,11 .11 II - 1,,
_5 .16 .11.5 11 ,11 Ill 39 3_ .-1
9 t7 .1.1 t2, 5 12 tl I11 ;19 _ ,
2 I0 t6 t2 -11.5 tl 11 1(_ |(i -13
11 47 -12, fi 12 42 .11 II .tl .-1;;
12 t5 t2 42.5 12 .t2 11 .t2 - 7,q
13 46 16 19 51 52 ,3 , ,4 1
1.t 44 12 42 t2 -1'-' 4;I 43 - 2
15 15 12.5 t2 II 11 .I1 t2 - 7
3 llJ t0 117.5 117.5 :17 37 ;;7 3_ 5
17 42 39 10 10 IO 41 .tl - 2
18 .t4 t0 40. 5 tl 41 .11 41 _ d
19 2_ '-)-_ 27 25 -,)..... i;; ....... 21
20 25 26 25 23 21 2o I_, -;24
21 26 27 26.5 25 23 2'2 2l -1',
4 ..')') 211 .,,o,, .')2 21 19 19 1 ", ---
2:i 22 22.5 2q 21 21 2o 2_) - 9
21 2t: 2:1.5 2t 21; 22 22 21 - 1;_
I 0 oo .l.inc Et,ngt.h .I..1 11219 :1217 ;;216 °,.1'"- :;21,; 321,, -. 1,,
;.
17-10 I.- I
O0000001-TSF14
• r,
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_'__ SECTION 18
_"'! DATA COLLECTION SUBSYSTEI_I (DCS)° LANI_AT-1
v }
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...: I)ATA C(H.I,ECTION SLrRSYSTE1M(1)CS_
-7. I0
o, The Data CollectionSuhsysten_was turnedOFF .'ffterOrbit12(lu0on lltJ/tnuary I,q75and tilt,l)atqC_dlectlon mission was assumed hy Landsat-2atthnttime. 'lllcl,andsat-IDataCollecticmSub-I
,, _ ' ,_Vsium Jt_ Ctl|)til)le of resullljng opcrationai sttlttltdf if desired.rl
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00000001-TSG02
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AI
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APPENDIX A
LANDSAT-I ANOI_LALY LIST
a
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00000001-TSGO3
1 I ' I!I
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ORIGINAL PAGE IbOF POOR OUAI,_'r_'
U
00000001-TSG04
: ': L L
ORIGINAL PA(;I.; Ib
I_'_-I A I,"-
,,.,/-,,_ _' _,_o _ ,:_o._,,,,o.. ,,_:(.,.,o " -' , _, _ o .. ,., 0. ..... _,o _ ' co" ,,uo,, _ x"<x,_,, . o"_ _ .,
00000001-TSG06
,,i I
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:. v_.
_' APPENDIX B
" LAI_'DSAT-ISPACECRAFT ORBIT REFERENCE "FABLES
'°_, .|
:/
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O0000001 -TSG07
LA RrDSAT- 1
SPACECRAFT ORBIT REFERENCE TABLES
' FROM JANUARY 1977 TItROUGH JUNE 197_
ORBIT 22622 TItROUGIt 3O235
FLIGHT DAY 1623 TRROUGtt 216t_
I
' LS-I
" • _' • o" ,; , v v-v ^ o -, ,_ _, o • . " _ ^ " o "_ '
00000001-TSGO8
• _' i.,ANDBAT._, DI_GINM., PAGR I_OF POOR Q[IAI,rrY
dANle 1977
DgiBlliggiDilgOgODQmiDDIOigSmiIDiilgDm_iDiOIQBOiQDIR_imDmWliUmg
I I GMT I ELIGHT I sPACECEAFT I REFrR_hCE I _EF I CYCLr II DATF I DAY I DAY I _|TS I bRd|T_ I OAY I _Ue I
i_l_mggmm_logolmeo_g_gogegm_a_l_g_u_g_o_lO_l_D_m_g
P I 2 167; P2_3o-_b_q
_ 5 16_7 C_o7o'cco_1
7 I 7 16_9 d270_'_719A I 8 1630 _7_U'_73_q _ 9 1631 _73_'_7;7
10 1 10 lo3_ _7_0"_76t11 l 11 1633 _276_'_77_|P 1 12 163_ _77_-_78_
_ 13 _ 13 163_ _790"_80_1_ i 1; 1636 _80_'_eI_ RECER_NCE FRAME _EIN_
....' tR i tS 1637 _d17"_3_ S_IFTED THREE DA_1h ¢ 16 1638 _o31°_0_ rNeV 76 - dA_, 77)I7 i 17 1639 _o_b._o5X
Po i _0 16_8 _E_7"_Oo
o, _7 I _7 16_9 _2_86-_99R..o P_ 1 _8 lo50 _)9"_3J1_'_, P9 I E9 lbbl _3vL_'£30_k
30 4 30 166_ _3u_l-_O
_':_
I
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00000001-TSG09
1
_- I t _MT t ELIuNT t 5PALLL_AFT I hEF_:JFi - I .EF I CVCL._ II DATE I _Y I ,_Y I _7 _ _ __"_:,TT_ l ,:_V _ '_e I
6 I 37 1_59 t _31E_'_a137 ?tn._P3 1_ 927 I 38 16_0 i _313o'_31_I _P_.?_7 17 9_& 1 39 1601 I _15='ca1_'_ 23_-_1 1_ 9_9 I #0 16b_ t _315_'E3179 I" 1 _ 1 93
10 I _1 16_3 I _31_'_319_ 1_ = E_ E 9311 1 _ 16b_ I _319_=_3_07 _q- _ 3 931_ _ _3 1605 t _3_0°'_3_ _- 5b _ 9_t3 I _ l_b I _3¢2_'_323_ 57- 70 5 93t_ ( _5 16o7 I _3_3_'E3_9 7_- _ e 9315 _ 46 1bo8 I _3_5_'_3_b3 8_- 9_ 7 93lb 1 _7 1_9 I _3_b_'_327_ 9q'111 8 9217 t _ lo70 =3=77"EJ_?0 11_-125 _ _218 t _9 _b71 _3=_-233_,_ 1_-139 lO 9319 1 50 167_ =3e3_°_31_ 1._-153 11 9320 _ 51 1_73 _3al_'EJ_3; 15_-1_7 l_ 9321 _ 52 1_7_ _3_3==_33_6 leA-l_l 13 93_ F 53 It75 cj_7"_j3_ 1_-195 i_ 93_3 l 5W lb76 R3_i'_J37_ 19A-_39 15 93P_ l 55 Ia77 _337o=_a_ba E1n-2_3 le 93P5 t b6 lo78 _3_=c3_3_ 2_=P37 17 932b 1 57 i_79 E3*_-_I_ 23_-_01 l_ 93
I,_-1 l;-;;
_ i _ I. I,
LANDi_AI",,_,
MA_$1977
mmQallgog_mDQmm_m_lagommmoQilloimlowi_s_glm_gom°li°m°m_I_
t t _MT-t-E61bHT t- _PALLC_APT t REFrR_NCE I REF t CY_LF tI DAT_ I DAY I DAY I _n_S I _IT_ I DAY I %U, I
"'''''''''1 I 60.... "'''''''''''':_:;_:5;''1_2_3_ .... Pq-''''''_2 ........... 3 9;''"
6 l _S 1667 _361b'335E7 9q-111 8 96
& I b7 lbb9 _3b_'_355R ]2k-13_ 10 9_9 l b8 1690 _365b'_3569 1_n-153 11 9_
10 _ _9 lb91 _367_-_3583 15_-167 12 9_11 i 70 le92 _358_'_3597 16A-181 13 9_1_ I 71 1o93 2369b'2aoll 1_-195 1_ 9_13 ; 7_ lb9_ _1_'2362_ 19A-P09 15 9_t_ l 73 1b95 _3¢2_'23639 21_opp3 16 9_
_: 15 1 7_ 1696 _3=_'_3653 22;-P37 17 9__. 16 1 7_ lb97 _3pS_'23_b7 23A-_51 18 9_
1_ I 77 1_99 _3t,_=-23_9_ 1_" p8 2 9519 t 78 1700" _o9b'23709 _q- _2 3 b520 _ 79 1701 _3710"_72_ _ 5u _ 95
. 21 I bO 1702 _72_-23737 57- ,0 5 9_2_ ¢ _1 1703 _=7_¢'_751 71- 6_ b 95
_' P3 I b2 170_ _375_'d_76_ 8K- 9_ 7 _52_ _ _3 1705 _37b0"_778 9q-111 _ 95_5 I o_ 170b c377_._3792 11_-IP5 9 _
_: 2_ 1 b5 1707 _379_-23_0_ 12ko13_ lb 95E7 i _b 1708 _3e_7-_3_0 1,n-153 11 _52_ # _7 1709 t _3_2]'_3_3_ 15_-1_7 12 95p9 ! b8 1710 I _363b-_36_ lbR-1_l 13 953_ t 89 1711 I _30,_'_3_b_ laP-l_b 1_ _5_t I 90 171E I _3063-_87_ 19A-P09 15 95
B-4 l.S- I
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;;_ " ,, '> " :' :-;_':-., '_'9 ', ' :,. -' " .... ;" :_,°i " "_'":, _ ,::" ;)' _'/I° ° ':; " ':'; "..........
O0000001-TSG11
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dULl1977
I DA?_ ! DAY I DAY I UH_|T$ I ORBITS I DAY I _Oe I
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00000002-TSA03
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....... I 1_ I 257 lb7S _619_°_6205 1_- 28 2 105....._; 1 iS t _58 1880 _b_Qb'_b219 _qe _ 3 105
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I a_ i _73 1_95 _b_l='_b_2B 23A-_51 1_ 105
,: LS-1
O0000002-TSA04
_ANDSAT._
UGTB1977
m_IIDmlgtQIIDOOQgQQ_mO_mQ_I_DImDIQIIItemQgmD_mgQDQQII_Bm_mtgU
; ;-GHT-t--£LIGNT-I _- 8_AC[C_AFT t--R£_rR_NC[--t-REF t CYCLF l ....I DATE _ DA_ I DAY I U_|t$ I _RBZTS I DAY I _, I
t I 27¢ 1896 I _6¢2_'26¢¢R I- 1# 1 I 106" R I 272 1897 t _6¢¢=°26¢5k tq" 28 2 I 106
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I 278 1900 I _b485°_b_gR 5?- 70 5 I 106....... 6--_ 279 190_ t 26_'26512 71- 8_ 6 t 106
- 7 I 280 1902 I _o513"26526 8R- 98 7 I 106I 261 1903 t 26627"_b539 99-111 8 t 106
I 9 I 2B2 190_ 1 26b_0"_6553 11_-125 9 I 106-t-- IO I 283 1905 i _655_-_6567 126-139 ;0 t 106
tl ! 28t 1906 1 g656b-26581 1_n-153 _1 1061P t 265 1907 I 265S2"26595 15_-167 _2 106
I 1_ I 286 1908 I 2659b'_6609 16A-181 13 106--t- 1_ _ 267 1909 t _6010"_b623 18P-195 1_ 10&
I IS I 288 1910 I _662_'_b637 19k-_09 15 106_t---16 f 289 191_-- t _6b3b'2bb51 21_-223 1_ 106
t7 t 290 1912 I _6bS_*_b66_ 22_-_37 17 1061A I 291 1913 I gbb6_'26679 23AeP51 18 10619 t 292 191_ I _6080"_bb93 I- 1_ 1 102_0 ! 293 1915 I _6_9_'26707 1K_ 2_ 2 10221 t 29_ 1916 I _70_'_6721 29- _2 3 102
.. _P-. _ 295 1917 t _b72_'2b73R -_-5b _ 10723 ; 296 191_ I _b73_'_67_9 5?- 70 5 102
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00000002-TSA05
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-! I DATE ! OAY I DAY I _O|TS I _R_]TS I OAY I _Oo I
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I 29 t 333 1955 I _7_5_°_7_6_ 7_- _ I 6 109_ 1 30 I 33_ 195_ 1 _7_bb'_7_79 I 8_- 98 1 ? 109
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I I I 335 I 1957 E7_80i2729_ I ?qi111 8 I 10_! _ ! 33b I 1_5_ _7_9_'_230h I 11_w12b 9 I 109 ,..
3 1 337 I 1959 _7a0t'E7320 I 12_-139 _0 I 109..... _- -t-338-1-- 1960 ..... _7J21°_733_-t-,-1_not63 LI_-t - 109
b t 339 1961 27_3b'_734A 15_olh7 12 1096 I 3_0 1962 _7_giZ736a 16A-181 13 1097 I 3_1 19o3 27ab3°27376 1bP-195 I_ 109
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.... IO I 3_ 19_b _7_0b'_7_lA 2_-237 17 109; 11 1 3_§ 1967 _7_9-_7_32 23A-_51 18 109
1_ I 3_6 1968 g7_33-_7_ I- 1_ 1 11013 8 3_7 19_9 _7_71_7;60 1;- 28 _ 110
- 1_ _ 3_8 1970 _7_bli_7_7_ 2q- _ 3 110lS _ 3_9 1971 _7_7b'_7_SR _- 50 _ 11016 _ 350 197_ _7_-2750_ 57- 70 5 11017 I 35_ 1973 _7503°_751_ 71- _ b 1101R ¢ 35_ 197_ _7517"_7530 8_. 98 7 11019 I 353 197S _7631i_5_3 9_-111 8 110_0 ( 3b_ 197b _7b_._7557 11_.12_ 9 110_1 t 3_5 1977 _7_50"_7571 1_k-13_ 10 110
l _? t 356 19_6 _7_7_'_75_ 1_n'153 11 110_3 I 3b7 1979 _7_b-_7_9 1_-1o7 1_ 110
-- _ I 358 1980 _7_00°_7613 16A-181 13 11025 I 359 1961 _701_'_7_7 lb_-195 1_ 110_b ; 3e0 198_ _7b_o-_7b_! 19_-209 15 110_7 1 3b_ 1983 _7_-_7_55 _1_o?_3 lb 11028 _ 30_ 19_ _7bSo-_7_bg 22_-?37 17 110_9 I 363 19_5 _7_Tv-_Tb_3 23_-?_1 I_ 110
t _0 i 3_ 19_6 _764_i_7697 I- 1_ 1 111I al I 366 1987 _769_*_7711 1K- _8 _ 111
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00000002-TSA07
I.ANI)EAT.I
dAN,1978
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00000002-TSA09
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LS-1 B-19/20
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APPENDIX C
LANDSAT-1 DOCUMENTS ISSUED THIS REPORT PERIOD
i.
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00000002-TSA14
APPENDIX C
I,ANDSAT-1 DOCUMENTS ISSUED TIIUS ItEI_(_ll'I ' PERIf)D
No, Document No, Title mid Date*
1 1HII-U-1N45-203 Tentative C_m_parlson of Uplhlks, Goldstoue vs.Santiago), u._tng l.andsat-1/2 Iluceivcrs, ch_tcd4-29-77.
: LS- 1 C- I '2
NNNNNNN'__TR_n_
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lrlt1_lNO PAe,_ I_T,ANK N,r,' PTt_I_
TABLE OF CONTENTS
Secti.___2.n Page
INTRODUCTION ........................ _IL
I SUMMARY - LANDSAT-2 OPERATIONS ............... I - ]
2 ORBITAL PARAMETERS .................... 2-I
3 POWER SUBSYb"rEM ...................... ::-l
4 ATTITUDE CONTROL SUBSYSTEM ................ I-J
5 COMMAND/CLOCK SUBSYSTEM ................ 3- l
6 TELEMETRY SUBSYSTEM .................... 6-1
7 ORBIT ADJUST SUBSYSTEM .................. 7-l
i8 MAGNETIC MOMENT COMPENSATING ASSEMBLY ............ _-1
9 UNIFr_D S-BAND/PREMODULATION PROCESSOR ............ 9-1
10 ELECTRICAL INTERFACE SUBSYSTEM ............. 10-1
I II THERMAL SUBSYSTEM ..................... 11-i
12 NARROWBAND TAPE RECORDERS ................ 12-I
I 13 WIDEBAND TELEMETRY SUBSYSTEM .............. 13-1
+_ 14 ATTITUDE MEASUREMENT SENSOR .............. 14-I
.t15 WIDEBAND VIDEO TAPE RECORDERS ............... 15-1
: _ 16 RETURN BEAM VIDICON .................. 16-1
17 MULTISPECTRAL SCANNER SUBSYSTEM 17-I
+ ,L
APPENDIX A - LANDSAT-2 ANOMALY LIST ...... , ............ A-1&
I I APPENDIX B - LANDSAT-2 SPACECRAFT ORBIT RE FERENCE TABLES ........ B-I
, APPENDIX C - LANDSAT-2 DOCUMENTS ISSUED THIS REPORT PERIOD ........ C-I)
"r:, , L
L:J I
LS-2 iil
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O0000002-TSB02
LIST OF ILLUSTRATIONS
I,'ig_,rc Pag e
2-1 Effec! of Orbit Adjusts and Pitch Position Bias Orbit Mahltcnm_ee on l.andsat-2'sGround Track .................... __ . .-._"
b
" " Local Mean Time of Descending Node - Landsat-2. 2-32-3 Predicted Local l_Iean Time of Descending Node for i_lldsat-1 and Landsat-2,
;, 1976, 1977, 1978, 1979 .................... 2-62-4 Drift in the Angular Plmsing Between Landsat-1 m_d Landsat-2 ...... 2-7
3-1 Landsat-2 (Midday) Degradation vs Days .... ' '_/ 3-2 Landsat-2 Midday Solar Array Current ............ 3-3
_:__ 3-3 Landsat-2 Actual fl and _ (Paddle) Sun Angles ............ 3-43-4 Predicted Beta Angle for Landsat-2 - 1977, 1978, 1979 ......... 3-5i
4-1 Landsat-2 Gating History ................... 4-34-2 Landsat-2 Gating F_xluency vs Time ............... 4-5
i ,_ 5-1 Landsat-2 Drift History ................... 5-1• 5 2 Cumulative Clock Drift 5 2-- • • • • e • • • • • • • • • • • • • • --
_, 5-3 Drift Rate of S/C Clock ................... 5-2
: 9-1 USB (Link 4) AGC Readings at Goldstone with 30' Antenna - Landsat-2 .... 9-1
11-1 Landsat-2 Sensory Ring Thermal Profile .............. 11-2
13-1 WPA-2 (Link 3) AGC Readings at Goldstone _th 30' Antenna, Landsat-2 . . . 13-2
15-1 Landsat-2 _R-2 Tape Usage thru Ol_it 12722 ........... 15-1
17-1 Computer l_Iap of MSS Scenes This Quarter - Landsat-2 ......... 17-317-2 Computer Map of I_ISSScenes Since Launch - Landsat-2 ......... 17-5
i18-1 DCS Message IItstory .................... 1_-2
iv 1._-2
)2' •.'"
O0000002-TSB03
j!t I t ! I t
LIST OF TABLES
Table Page'.31
1-1 In-Orbit Payload Systems Perfomance Launch thl_ Orbit 12, 71_3(7/27/77)Landsat=2 ........................ 1-2
:; 2-1 Landsat-2 Bl_uwer hi•an Orbital Paramctcrs ............ 2-++
3-1 Landsat-2 Batter), Restoration Cycles ............... 3-63-2 Landsat-2 ]_Iajor Power Subsystem Parameters ........... 3-7
_:. 3=3 Landsat-2 Power Subsystem Analog Telemetry (Average Value for Data+° : Received in NBTR Playback) .................. 3-8 _,
4-1 Landsat=2 Pitch Position Bias Quarterly Pneumatic Gating Summary .... 4-1_ 4-2 Lands•t-2 Subsystem Temperature and Pressure Averages ........ 4-7
: i 4-3 Landsat-2 ACS Voltages and Currents ............... 4-8+° 4-4 Landsat-2 ACS Attitude Errors and Driver Du_, _vcles ......... 4-8
Command/Clo k Telemetry Summary Lane at5-1 c , s -2 .......... 5-3
° 6-1 Largisat-2 TMP Telemetry Values ................ 6-1
- 7-1 Lands•t=2 Orbit Adjust Smnmary ................ 7-1_: 7-2 Lands•t-20AS Telemetry Values ................ 7-2
:J 8-1 Landsat-2 MI_ICA Telemetry Values ............... 8-1
+ 9-1 Lands•t-2 USB/PI_IP TelemetxT Values .............. 9-2
° ; 10-1 Lands•t-2 APU Telemetry Functions ............... 10-1
11-1 Lands•t-2 Thermal Subsystem Analog Telemetry (Average Value for Frames_ of Data Received in NBTR Playback) 11 3
o6"
11-2 Landsat-2 Compensation Load History .............. 11-4
+ by i_Iode 12 1.... 12-1 NBR Operating Ilours ................. -_o_, 12-2 Narrowba_d Tape Recorder Telemetry Values, Lands•t-2 ........ 12-2
+:./ " 13-1 Typical Widebaa_d Subsystem Telemetry .............. 13-1
.... try:, 14-1 Lands•t-2 AiXISTemperature Tel•me .............. 14-1
°:: 15-1 _3VTR Telemetry Values .... _I_\:TR-I'Te'I m _': ....... 15-215-2 Function Values by Mode, Lands•t-2 e et ....... 15-3.... 15-3 Function Values by l_Iode - Lands•t-2 WBVTR-2 Telemetry ....... 15-4i
": 16-1 RBV Telemetry Values .................... 16-2: 16-2 Camera _ 1 (Blue) Telemetry (Values in TMV) ............ 16-3
; _i 16-3 Camera _2 (Yellow) Telemetry (Values in TlXIV) ........... 16-3;: 16-4 Camera # 3 (Red) Telemetry (Values in TI_IV) ............ 16-4
_ + "i 17--1 _'SS Telemetry - Land_at-2 17-7
° :;_ -|, 17-2 iXlSSResponse Ilistory - Lands•t-2 ............... 17-_
°_+_ 18- 1 DCS Telemetry _'alues lS - 1• o • +* • (* • * • • • i • ¢ • • . • • •
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LS-2 v,vi
'i+
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O0000002-TSB04
IINTRODUCTION
"! This is the 11th report in a continuing series of documents issued at launch, and quarterly thereafter.' to present flight performance analyses of the Landsat-2 spacecraft. Previously issued documents are:
Document No. Title Date
75SD8t214 Landsat-2 Launch and Flight Activation 21 March 1975Evaluation Report, 22 to 26 January 1975,
+" Launch through Orbit 50 and Orbit AdjustOperation.
75SDS4228 Landsat-1 and Landsat-2 Flight Evalua- 15 August 1975 _.tion Report, 23 January 1975 to 23
_, April 1975.
-, 75SDS4255 Landsat-1 and Landsat-2 Flight Evalua- 10 October 1975tion Report, 23 April 1975 to 23 July
' 1975.
75SDS4266 Landsat-1 and Landsat-2 Flight Evalua- 1 December 1975tion Report, 23 July 1975 to 23 October1975.
76SDS4207 Landsat-1 and Landsat-2 Flight Evalua- 29 February 1976t/on Report, 23 October 1975 to 23January 1976.
76SDS4248 Landsat-1 and Landsat-2 Flight Evalua- 14 July 1976tion Report, 23 January 1976 to 23 April1976.
76SDS4263 Landsat-1 and Landsat-2 Flight Evalua- 15 October 1976tlon Report, 23 April 1976 to 23 July1976.
76SDS4278 Landsat-I and Landsat-2 Flight Evalua- 30 November 1976tion Report, 23 July 1976 to23 October 1976
77SDS4204 Landsat-1 and Landsat-2 Flight Evalua- 22 Fabruary 1977tion Report, 23 October 1976 to22 January 1977.
t
77SDS4228 Laudsat-1 and Landsat-2 Flight Evalua- 23 May 1977tion Report, 23 January 1977 to23 April 1977.
This report contains analysis of performance for Orbits 11461 to 12732 for Landsat-2.
LS-2 vii viii
.!
O0000002-TSB05
"' I
I!
-'p_ ]ii ° SUMMARY
: LANDSAT-2 OPERATIONS
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O0000002-TSB06
I SECTION I
SUMMARY 12_NDSAT-20I_ERATItlNS
I*)*; * *Tht, l.m_sat-2 spacccr,'fft was launched from the Western Test Range _m Jmluarv 22, 1975, at u,...17,
55:51, (;¢|,1. 'lllt, httmclt ,'la(I orhlt injection phase of the space flight were nominal and depltt_ ntt, nt ofI, the slmvCt'l'|lfi followed predictions,
I All Systems continue toperiorm normally except l,'orwardScmmer Pressure, Forward Sca/itlcl"Pl_vssurc Telemetry, mid Widebm_d Video Tape l{eeozxier No. 1 (WI_V'rR-1). The Forward ScannerPressure luxd begun leaking before launch but will not affect scanner performance. The Forward
Scmmer Pressure (Function 1003) telemetzT became erratic In Orbit 2244 on 2 July lIJ75.i! WBV'ITt-1 failed to rewind Juring Orbit 1021. 5 July 1975. and had intermittent operation until Orbl!
90'..3S. * July I975. when normal operation was resumed. _BV'I'R-1 had a new anomaly in Orbit
f 26s3 on August 3. 1975 Imcause of failure of one of the 4 heads. As a result, it could not be usedwith MSS data. but pertbrmed satisfactorily with RBV data (because RBV provides a synchronizing
! pulse which permits data from the bad head to be Isolated and eliminated). The loss of 257: of the
data was obscured by substituting an adjacent line of data maintaining usefulness of the scene for
I most purposes. After Orbit 7181 on June 20. 1976. the recorder was used retpalarly in serviceJ recording RBV data until failu_'e of a second head in Orbit 10064. 13 January 1977. All operation
of WBVTR-1 lmve been discontinued since that date.
WBVTR-2 started to rewind but stopped prematurely in Orbit 1919, 9 June 1975, and again in Orbit3_54. 26 October 1975, with the cause unknowll. Unit remains operational. Occasional slippage in
the power supply causes motor speed changes and high bit errors, but these are quickly corrected
I hy simple operational procedure.a
Batteries 1, 2. 5, and 6 have been turned OFF for restoration cycles and returned to service "after
l a few weeks. Battery I, tutamd OFF, in Orbit 12562 on 11 July, I:J77, remained off thru this reportperiod.
The Spacecraft continues to perform its mission satisfactorily. Table 1-1 shows cumulative in-orbit
I payload system performance.
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!_ Table 1-1. In-Orbit Payload Systems Performance Launch thru Orbit 12.7M3 (7/27/77) l,andsnt-2
ItBV Total Scenes Imaged 2506Avg. Scenes/Day In Operation 7
: Total Area Imaged (million sq. n ml.) 21. si ON TL_E (hr.) 24.2
v- _ ON/OFF Cycles 313'_;,Real Time Images 70[,/,,_l_ecorded Images 30
MSS Total Scones Imaged 187.77sAvg. Scenes/Day 188 .'.Total Area Imaged {million sq. n. mi.) 1354ON TIME (hr.) 2035ON/OFF Cycles 12. 755%Real Time Images 75% Recorded Images 25
., DCS Messages at OCC 1. 108.684Users 48
ON TIME (hr.) 22, 004
WPA-1 % Real Time Mode 69" % Playback Mode 31
ON TIME (hr.) 103
ON/OFF Cycles 671
i ' WPA-2 c,_oReal Time Mode 70J %P/B Mode 30_-_, ON TI_IE (hr.) 1809
_. ON/OFF Cycles 9925
_/* WBVTR-1 _, Record Mode 38, %Playback Mode 41
_, %Rewind Mode 20%Standby Mode 1Time Head-Tape Contact {hr.) 121.7Cycles Head-Tape Contact 1950ON TIME (hr.) 154
_-' WBVTR-2 % Record Mode 38_0Playback Mode 41% Rewind Mode 20% StandbyMode 1MFSE Count in P/B --I0Tlmc llead-Tape Contact (hr.) 787
• _ Cycles ttead-Tape Contact 10.01.6ON TIME (hr.) 996
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O0000002-TSB09
SECTION 2
ORBITA I, PARAM ETE RS
During this report period, Ltmdaat-2's ground track has decreased t_ within 0, 45 n, m, longitudeerror at the equator. This was accomplished by controlling the ACS Pitch gatcH through use ofthe Pitch Position Bias mode. (Me Section 4 also), Therefore. no orbit maintcnanut., hum of the
()AS was required during the current report period.
The errors in longitude since launch as a function of tim. and orbit maintenance burns arc shown: in Figure 2-1. Figure 2-2 shows the mean local time at the descending equatorial crossings,
As of 23 July 1977, Landeat-2 has descending equatorial crossings at approximately 09:08.39 mu'_nlocal time as opposed to 08:21:23 AM for Landsat-1, A projection of mean local time at the descend-
' tag modes for both spacecrafts is given in Figure 2-3.
• The difference in orbital periods between Landsat-1 and Landsat-2 caused a drift in the angulari phasing between the two satellites with Landsat-1 converging on Landsat-2. Landsat-l's orbit was
" adjusted between 20 October 1976 and 28 January 1977 in order to increase the time (angular)separation between the Landsat spacecrafts to 29.73 minutes. Figure 2-4 shows this phasing
i pattern, showing I.tmdsat-2 leading Landsat-1 by 00,21.49, an orbital equivalent of about 76%
The Brouwer 1_ean Orbital Parameters for Landsat-2 are given in Table 2-1. Appendix B gives
- ground trace repeat cycle predictions.
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O0000002-TS B11
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F ORBIT ADJUST
10 F NO, 109 8,99
8 ORBIT ADJUST START ACS PITCH BIASNO, 9 MODE OPERATION
7ORBIT ADJUST +8,88
•_ 6 NO, 85
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"i 3= ': 9 -3, 24
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: - 6 OPERATION
-7
°"" - 8 ADJUSTS 1 THRU 7 (25 JAN- 12 FEB 75)=.. r- To ACHIEVE NOMINAL PARAMETERS AND
; - 9 _1 PROPER PHASING WITH LANDSAT-1
-10
° _12 I I I I I I I I I I I 1 I I I I I I I I 1 1 1 I I I I__L_" 0 I 2 3 4 5 6 7 8 9 I0 11 12 13 14 15 16 17 18 19 20 21 22 23 24 2.5 26 .'/ 28
REPEAT CYCLES
_ II I i I I I i I i I , I _ I i I I I I I I I, , I , I , I _' 0 311 813 1315 1817 2319 2821 3323 3825 4327 4829 5331 5833 6335 6837: REVOLUTIONS
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OPERATION i ]CURRENT REPORT PERIOD i
.1 I I I I I I I .I. I I I I I I I I 1 I I I I I I I i I L I I 1_0 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 J9 49 50_LES
_L__L_..L..l i I i I i I I. I , I i I ,... I I 1 i I, l i I, I , I ,5331 _33 6335 6837 733978418343 88459347 904910ssl ,o8_3_35__8_0 _24_
Figure 2-1. Effect of Orbit Adjusts ml(l PitchPosition Bias Orbit Maintenanceon Lm_dsat-2's Ground Track
t,s-2 2-:_/.t
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_ POWERSUBSYSTEM(PWR)'',
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00000002-TSC04
SECTION :l
I_OWI.'.I{ SUBSYSTEM (PWR)
The Power b_bsystcm on I,andsat-2 has l_erformed satl,_factorlly throughout this report period,
The solar arrays continued to provide cxccs,_ enurg_ above spacecraft and payload rcquircmcnt,_and are expected k_ support the Iamdsat-2 mission through V,17,r, The percentage degradation ,.,f
the arrays is plotted as a function of days in orbit in Fll_mrc 3-1, along with the pro-launch p)'_,-dieted array degradation. The array degradation at the end of :it) months in Orbit was 16o 9',.
which is higher than predicted. The projected values of midday array current arc plotted inFigure 3-2. Ilcre the array current is adjusted for sun intensi_, and array degradation, a._ wellas sun angle. Along with the same curve is plotted the actual telemetry values observed untilthe end of the current report period.
The battery packs on-line averaged 10 to 11_ depth of discharBe (DOD) during this report period.When any battery reached high charge-to-discharge current ratios (C/D) it has been tura:ed ()FFfor a restoration cycle of a few weeks, leaving 7 batteries on-line at all times. The history ofthese restoration cycles is shown in Table 3-1. Batter)' 1 was in such a restoration cycle at
the end of this report period. All other battery-pack performance remained satisfactory. Bat-tery voltages have been mai,..ained within suitable limits with Landsat-2 power management pro-cedure, excess array energy being dissipated through auxiliary loads. Temperatures rangedfrom 16.7 ° to 25.9°C during this report period.
The power subsystem electronics have performed well during this report period with all regulatedvoltages stable. Table 3-2 shows major subsystem parameters and Table a-a shows power sub-system telemetry for selected orbits. Some parameters in Table 3-2 may be slightly different
from those in Table 3-3 because Table 3-2 uses a power management time spa,1 (night folloxved
by day), whereas the time span used in Table 3-3 is the playback period from the NBR...The shunt limiter on Landsat-2 has operated several times since launch and has held the solararray bus voltage at specified levels.
Figure 3-3 shows the actual variation in sun angle to orbit plane and solar panels for Landsat-2.
: Figure 3-4 is a prediction of the sun angle through 1977 fur Landsat-1 and 2.
LS-2 2 !
00000002-TSC05
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O0000002-TSC06
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00000002-TSC08
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O0000002-TSClO
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{ORIGINAL PAGE
i OF POOR QUALITYTable 3-2. Landsat-2 Major Power Subsystem Parameters
Pwr. MgTnt. Os4,jt No. 50 2r_10 5100 71;11) {I)1!12 11912 1231J 1:_'7;:2.... _: .... _. i|
Bgtt 1 Max 33.4:l 33.25 33.66 :l:t,.a 32.57 ¢JFI -:12. :{i ¢)i.'F2 Chgo 33. ,10 33.14 33._3 a:;,.r, ;12..r,.i -:;2. _4 -a_. 41, -:{_. _;,
,,) ¢,) ,, ,
3 Volte :13. :I5 3:I.09 33. fi7 33. o0 32, .57 -32. q7 -.I.. ,)0 - I., {.,1 33.45 33. 211 32.60 :13.2o 32.59 ' ' _' -,I... ,JI -;_5 .q3.,12 33.2,5 33. (;5 :|3. IJ_ 32.56 -32. ¢,5 -32. _D! -,;.t. :Pt6 33.,1i 33.24 33.64 :'_(.79 32.56 -32.3¢; (,I'F :;..'.9,,
,$..,,L{ -l{;!. 911
7 113..15 33.28 32.68 Ill|. {1 :{2.59 -3;_. ,;_ - ' ', ¢.8 3:|, 15 :111.27 32.68 :{3.10 32.59 -3;.'. ¢;_ -.{...D | -:12.',:_
Aver_,gv :r,L{' 3:{.21 92._}5 :{:{.10 '_2.57 -'' '_ -:12.11. _,{-- . ,{" IJl'l,'Batt 1 End-of-Night 29.92 29.06 29.06 "9. o6 2H.9_ ( {FI' .,M ,
)' '_ 29 2M.3 Volt.s_ 29.;l_ ..{.1. 29.04 .12 05 -_. 70 -2% o I -'_..9,'*{ 3 29.32 29.07 39.07 2!{. 07 28. _9 -2_. ,;4 -2,,. :{_ -2',. 9_,
4 29.34 29.09 29.09 29.09 28.91 -2_. ,t; -29. olin -2% 91' " 5 29.40 29.06 29.06 29.06 28.97 -2_.6:{ "' ' -2_.-..J. Ill) ¢.)7
6 29.31 28.96 28.96 2_. 71 28. 88 -2_. ¢;2 OFF -2_. 9_;t 7 29.34 29.08 29.08 29.00 29.00 -2% {;5 -29. ¢1¢1 -2_.hU¢)
• t 8 29.34 29.00 29.0O 29. 00 28.91 -2_. ¢;,5 -2!). _lo -2_. 91• Average 29.34 29.05 29.04 '29.06 28.94 -2_. ¢;5 -2s. 91 -2_. 91;' Bat/. 1 Chgo 12.76 12.13 12.43 15. 51 13.74 OI,'F 13.65 ()F-'_
-_ ' 2 Share 11.68 12.45 11.42 13.54 11.44 15.31 13.91 1:{._;6i ] 2 (_) 12.24 13.67 12.48 14.13 12.41 14.116 13.77 13. _4
l 4 11.99 12.50 11.76 1"1.97 11.81 1:L 94 13.42 13.5o., 5 12.84 11.52 13.24 14.32 12.95 14. U4 14.37 l,i. 1,5
" 6 13.35 13.20 14.32 ** 15.14 16.35 OF F 1:,. ¢;2° | 7 12.90 12.81 12.97 14.3o 11.74 13.10 14.41 ]3. _:)
] 8 12.24 11.72 11.38 1'{.14 10.77 12.49 13.46 14. "5Bat| 1 Load 12.60 11.35 11.80 12._i 11.16 OFF 14.51 OFF2 share 12.70 13.99 13.34 15.60 14.14 11.63 16. '_1 15. _:1
• • o,)_.. 3 (c_) 12.67 14.38 13.74 15.11 13.94 1,5.72 lb... 17_._:|_ I 4 12.44 12.99 12.48 14.71 13.00 14. _4 14. _2 15. ;,_; ;
{ 5 12.34 i1.58 12.36 13.60 9.011 14.64 13. !{,l 1t..3: 6 12.70 11.30 11.56 ** 15.27 14. I;7 OFF 13. l,;
.,/ 7 12.47 12.35 12.70 14.03 11.33 13. 04 11. _7 12. ,;:l_ I 8 12.04 12.06 12.02 13.72 11.21 12. 46 11. _2 11.15
{ Bat| 1 Temp 21.46 21.34 21.94 21.17 22.71 1.). _ 21. I;,; 19.31!_ 2 ill 20.25 21.44 19.94 19.90 20.30 21..7 20. I;5 19.6',)
3 (Oc) 18.60 19.18 17.86 17.79 17.52 17..11 17.73 17.01= _:;i 4 20.83 20.91 20.36 20. :_7 20.,'{6 20.01 20.2tl l.q. _3
,_,, ' 30.49 ')'). 29 22. _1 23. ]3
5 24.98 22.31 27.27 --. (){ -": _' 6 24.26 23.01 27.28 20.49 27.69 ...'_"7_ 2¢_.97 ...'"'''J.{
.... . .}0 24.50 227 24.71 23.62 26.32 ')" ¢ 27.01 22.75 21.8 23.63 22.71 24.41 22.40 24.55 21. _¢; 2,t. 4O 23.54
°: | Average 22.34 21.81 23. i7 21.01) 23.83 21. _0 21.4!{ 2I. 21
_;' [ S/C Re{{Btm l)wr. (W) * 185.0 149.3 146.12 154.49 1.16.o 175.7 13l._,Comp Load Pwr. (W) * 41.2 24.8 17.6i 6.64 ,. I;4 ¢;.04 ,;. ,; l]D/L Hog Bt_ Pwr. (W) * 9.6 9.8 I1. _1 9.59 9.5 '21.._ li.',
=_ _ C/D Ratio 1.15 1. lO 1.11 1.15 1.24 I. 1_ 1. l'J I. 17
._.t._; Total Cha_o (A-3_ 271.9 noT. _,5 2_3.46 239. 11 ...L 51 23|.1;11 232.7G 222. I1._,_. Total DiBoharge (AoM) 237.2 244.33 201.45 207.47 |_0.84 l!{tl. ¢;i; 19}.'.tl l,_'J. ;,9
=__/_ Solar Arra_ (A-M) 1106 981 1003 _92 939 _31. _ _1 I. _ _,;¢,. _ {8.A. Peak I (Amp) 16.05 14.67 14.43 1;1.il 13.2,5 12.¢1:1 12. {7 12.5:_ {Mlddsy Array 1 (Amp) * 13.88 13.72 12.7_ 12. st; 12. 31 12. 24 12.31_ _ Angle (Dog) * -1.22 8.35 t). 11 lO. 7 ¢).3 (). I 3. ;,
"_ _ l_.x 14 Pad Temp _C) * 59.60 63.30 5% 40 5s. 4o 5¢;.,,,, ,'_. 4,, :, |. ! -o_; Mln R Pad Temp (vC) * -38.00 -35.00 _:_% |,. -:_4.4o -:_7. it, <{7. I,, -:,,..,,
i, Max L Pad Temp (oC) * 56.92 62.15 3{L 92 ¢;2.15 5,. !t2 7)7. i;!, 7,i;. :_2.... [ Mln L Pad Temp (o(2) * -45.00 -42.14 - t5.71 -39.43 - I{. 29 -4b. ¢)11 -11%2!1
_: { * Data not processed and unavailable-'_ • * Bat 6 was turned off for a restoration cycle
• ** Bat 5 was turned off for a restoration cycle• ***Bat 1 was turned off for a restoration cycle, I
i
LS-2 3-7
........ : ............ =. :.... ..... : : :: :,, : , =.... , .... ::: = = : :: ...... : :: :....... ,: ....... : :: :, :::
_" ,,' " "'. ..... =_-- --"-:.'_ _:_.:-'_'--_-_............. ' ................. .< .---.'::r ............. :_A............. _- - ..-....r._.....'._-I. - _ ._'_'::",,'"_"_-_" .................. "-"""'- ...... . _':.,
O0000002-TSC11
ORIGINAL PAGE Ib i> OF POOR QUALITY
; . Table 3-3. LImdsat-2 Power Sulmystem Analog 'relemctry(Average Yqilue/'orData lleecivcdinNIVrli llJnyhllt,JQ
;.
- ' I } I'lllil+
! l,'u1)ctlon |}oH Prl|l|llln I'lt|| _11) 3[132 {i 11)3 /i;ll ll|l!l,, 11_7; ' 1:'3:'11 1:';';_2
1_1)1)[ llzlll I |;|lPl{) | A|IIli |,ill (1t1_+# i),?, I ipi_,, il ,,,_ *till t77 ,llil
IHll|_ '.) ' I, ill (|+ |17 D, N'I I, Ih! II, I,. , ++:1 • p+l+ , 4,h
" (iil1):l 3 l. Illl |J• |111 II, I+? I, III II, Ib I , h+k , +1"_+ ¢!I_1
I|1)11.1 '1 | • 1)11 I1• 113 II, 7'+ I,o 'l, II. hll '+I ,7;'P . I I
1111113 ,5 1)+ 1111 1)+l'_'l II 71,I If+ ;I l II, I'," * +_'| , +i';' , '+'.
i I]1)1)11' I; |, 113 II, PIIi tl, 7:1 ' II, 'i1! • i'_:t i IIII , ',1:
I;1)117 ? I• IIII 1), II I Ill IMI II, !I+' II+ ;i,! . _I , II l • '1'','+(]1)IIH H II, 117 II, M7 II. 7t; I1oI,III II, ,I,_ . 71 0I+'| . I++
111111 BI_.I I I.'|_ | Anlli 1).,|? 1)•:,? (I, I_ li° ;+.++ ii, II, .ill •11_ ,ll;i
601 '-i- _ 41. ,13 1). :17 II. :|ill II+ Ill II, :|_ . 1:2 , llil i 'l:i
IJ01_ ++l 0•4+ tl,l;l II,,13 ll• 1_ II, Ill .110 ,,,h'l . lh
" 60|4 4 II, '1,1 1)• ;J? tl. 39 II. 17 0° ;l{I • f_ll ,5+, • '1+,
- ,',L 11015 5 11.47 1)•r_ II,,I,I lio I _ II° I,r, ,l;ll .#;l • I+7
! _'" 6016 # 6 0. ,19 O• 61) 1)• ,17 II, I!l • 119 . Oi; • ;,:P
6017 7 0.,|7 1)•111) O. |3 Ii• Is i;+ I11 • 57 .lilt • II;
; 6018 I_ (I..l_, 1)+_r) I}, 31'i II° I I 11. :|I_ . :i'l . ,_I; • ,|l,
L 6021 Bait I Volt VDC 31.50 :111•95 :ll•ll ;;l, 12 :lll,Tll -211.75 -:lo•++m -_%1;;I602,)+ o+ 31+,1H 3u.1+q} :ll.llll :;1. I1 :;ll. mo -3l, ll| -:Ill. :_ -:ll. |1
: 60_3 :. 31..19 30,91 31.111 :i 1..1:; 3,hXl *31. I)3 -30. I+[I -31. l;I
• 60')4 +1 :|l.+19 30•91 31•11) :ll, I;; ,lllo bll -31.03 -3u+b9 -;11• 12
:+: 6025 5 :11.50 30°92 31.11 :11• I;I :lll,_'!t -31.11,1 -311.5:1 -:4|• I;t'_ 1|0_6 t ( :11. |_J 31).|11) :11.08 3_, h+J 3ll, _O -3|.111 +'+'% 2_ -31. I1
; 6027 31.3_2 30•94 :li, 14 :11, |11 :111+½3 -31°ill| -311,|j| -3l. l;I
611;_8 .+i 31..19 3(1.112 31,1l :tl° I;; :ill. _I -:iL If3 -till• :itl - :I|, 3tl
60:11 Ball ;.Temp DGC 21,59 -'_0,,q3 21,9l 210 |z+ 22.11_" I'P,IIII _l•_.p+ |ti,;I'.l
Ii03_ '.+ 211.5LI 20,75 l!i. 91) 1!I, '_ll 211. ,IG 2tl. ; | _II• 9"; 19+ 51
611:15 3 18.10 11.1i6 17.77 17• 1:_ 17.51 17. I!1 lT.l,'_ Ih._i
60_4 | 211.1111 211• h_l 211° :13 211+31 "ll+ I_J 211. :++_ 211• '_1 IU° I,_'
6035 5 25. IG ..,..')'_'+'+ 27, l _q 22, li2 :;il. _'L._ +1_.!+II _+ ++_ _:{. |;I
:" :." 6036 l| 211. _J? 22, _,.I 21". | !1 Jllo I+_ 2_+°l.;' _+ +s3 '+ill+I.I 1 :J3• II l
6037 7 2+1. _3 _3+36 ')-GoI.II li• _+i) _ilL _I,+ +'_. !lh J I• h | _ lo L_h
: '+ " 6038 S 23,73 ,,0)•5'+" 2.1,36 2,2'+311 2 I. 1!i 21, 91 2;i,II; Z;;,',',
' 61)40 l_i. Pad Tcmp DGC 2tl. _ '_6. lli 3o° 91) 25. :| | 211. l I 2;I. "_ 25.2_+ :l l.. I
._. : 60.tl RI. l)adVM VIX' :1:1.72 :13. Pd; :12._l; :;1,0o ;ll,ll :l:;.lt 112.7:} A,i. ,n,
. ! 6042 Bt, Pad VN VDC 3:1..16 "i3.1 _ :12, i! ;;:), 17) 31.27 ;i2° _l) :12. :l!) :l I. ;u
6044 Lt• Pad 'l'emp DGc .,..'_556 21.111 ._J•'l..,+ 22.5;; 211. I1 21.3- 214, _1_ .;l• ,_,i
6045 Lt• Pad VF VDC .'t4.40 33.80 33.152 ;;l. ;|15 :4:t. 31, 33.75 :t3.21 ;| I• :l_
+ 6046 I1, l)ad VG _.'IX? 34..18 33.91 33,91 ;:1, 1_ 3:|,45 33. u4 L;,4.31 ;it• ta,
•-:' 6050 SiC UR Bus V VDC 31.73 31. I,t 31.:13 :;1• I111 :111,_1:| -31.19 -3i,. 71 -;ll° ¢,,;
,_ , 60_.,1 _/C Rt; Bus V vDe 54.57 2.t.57 2+1.5_ 21. 5_ 2t.57 -"4.57 -24.57 -'-'-1.;+"
6052 Aux Reg AV _,'IX" 23.36 23•40 2:l..l+l 2;;. I:: 2:1..l.t -23. 13 -2:+. iA ~23. It
'_"". 605:| At_ lleg BV "VDC 23, :I? 2 ti,39 2;I,.l.l 21,,l i 2:i..13 -23, 44 -23, .I -2;+,.Ii
'+ 6054 Solar 1 Amp 14.81 1:1.711 I:L tl, 12. ;17 12.2f_ 11.1i9 12.1,1 11. _03
6tl_| S/C 11(; Bus J Amp 7+23 7, 17 11+2_ 5• !1, _;, I I 5. 119 7.17 5• t7
•., I;|15,_ Pt: ModTl DC-C 21.67 2l•tl½ 211.77 2ll° 1!1 21,°11_ PJ._3 21•31, 1%97
60'59 I_,_ ,Mod T2 _ 20.,t,t 30.53 19•51| l!l. ::_1 11,. ll+ l_o ":1 lg,.t,| 1'% tl
61)711 1)/ L lt(; PIII_ _' VI)(" ')4,1|1 21o1111 _4.ltll 21° t|:_ ._|, 5!t "21_.61 -2-l.hil -_,l,l,_
'i 6071 l ) t. t'R Bus V V]_._ 31.tl5 :11•21 31.411 31, 711 :111.!17 -31*2 _ -311•7. - :11. ;,',
" ;_ 6073 l } Arm A% %'IX' 23• .17 2:3, 51 23.51 2:1.51, 2:|. 5o -23.51 -23.51 - ,'3• ;, l
(;0?4 PAux BV x."L_ 23.411 23•51 2:|. '51 23o 511 ;:|.5o -2"L 5_ -23.51 -+A.5|
(10"/'5 PII Mod Tl DGC 211. _,| 'l ', _ I ) _+0•21 m, _ ' 211. li3 ;21.7 _ 1'. _:_' 21. :12
,'_ , 21o72 II _1•_. :22•;,', _ L,,126076 Pit Mod "1"2 I)(_' ... 1 I ..'_'_,,1_1' 21,7,q 21.
.' 6079 Fuse Blow %' VIR' 2,1. ,PJ 20|•+|s 2.|o |!0 2 I. 51 ++',l. |- -'.I• ,it, -;_ i. |7 -" I. I,
!i 6080 Shunt I I Amp 0• 0 o, o ,,. m) I,. i, o. ,m . .., . ,., . ,,u"_ 6081 _ II• I) Iio II 11oqlll II. (I II IIII • ill, , llll . l,tl
• 'i (JO_3 _I (i• |I (I• {I (Io il(l (i• II 11, lill o"t+ . tnl . ,li+6(}8:1 ,| tl• (I tl, |1 |1o IIII I)o ql II. IIII o III} , IIII . IIII
61)8ot 5 (1• 1) I1.11 (10Ill} I10 II II. Iili o IIII . I}11 . IIII
,-t, , (|11115 (| I1• II 1)• I) {10(111 IIi II qi. IIII o IIII . Oil • +Ill(ili.ll(i ? II, II II. II |1oI}11 I10li I1oIIII 0 IIII o IIII o IIII
>>, 611_7 q I1oII I10li II, Illi II. II I}+ Oil . IIII 0 IIII 0Illl
..,. _. 1111111 |l L' 1+ |1(| lllUS X Anli) I,}t ;Ill I10I_,ll 1), 5 | Ill I,; i1+ |li • I+ll, . _ -- • I_i
TotiiJ Nu• Maiur I.'rii.ines I. 1"11} :1911 3tt7 7q'5 3x4 ti_,i7 ',ill 7_,', 7 17
v "' * I|altt'rv I| v,lis l!.lrlll,iI lltt hlr ;i I i..'4|llrli|llill (,%i,It,.
-;< ;7
?':011
.... i;'.'..2 ....... ,_+_--_:..'_+=____ ....... . .-.----++ .'++ ++;'--.,;+ uj.;£.+ ,':x.. il. .............. +.-+.- • :_i ..+..__. _.-." .._+.-_z k_.+_+2._+L._.;_"_ +-_T+.-_+ -_-+..... _'++'_--._'_z ..... _ _-+_+_f_._.._..L%.. + .. --- ,. . . . .... +.++--+ , . . ...... .
00000002-TSCI 2
_o
m
SECTION 4
. ATTITUDE CONTROL SUBSYSTEM (ACS)LANDSAT-2
,i
o
00000002-T$C13
I
J
j ,'-;ECTi( JN ,t
NrT|TI.[IH,I ('t]NTIOJi, ,";UJ]_Y:'dI,:M _A('_)
I.alzd,_lt-',!t:_ AttJttidi' ('tllltr,}l _V:.I¢'III Iml'f_Jrlm,tl lloVIIHIIIV :-,ill_'l' Ipllll;'h _li}d h{I;-, l'l_ll,-J, h,l|il\ ill:,ll}-
llllnt_tl {q)l'r('(-'{ 51)lit't*(-'l'llft _l|.iJ[ildL'.
I,I)W I)l't';-iHlll't ' ill tht' I,'t_r_;lrd ,_CIIIIlI('I' I't'Htl]lJl)l_ , I'l'l)lll {! prl'-I{lllll('il h'{ll_ h;l:-, il:lll lilt I'lh'{'l {ill lht'
a{.'_ _%'btL_l|_l ! ,*4 lit'l'fl,ll'llttUIt'L '.
Tim i}rol-,;ranl imldcnmnted in _L,iJtt,mlmr 1975 t_ tllininli_t, r',lmCec'r_lll JP,l'lJllll(I trm'k ill'ill h,, t'¢)lllf_,l_l|lZl._I)ih'h _zliJll_ W{l_ ('liiltJlltlt,(I illll'ilij._ Ihl,_ tltlZll'|l.'l', 'l'_tldt, .I-I 711111111=ll'j/l'7.thl' I_ih'll lliu.itiim 15l:1
Inollo ,_t_ClUtql(,_,_imllh.qlltqltt,(I tlii,_ ,V('|tr {1_ I)LII'I ,if thJ,_ IH'()l_,l'{[lil, ;llld I,'it;urt, 2-I ill _q,_'lll,ll _ ..htJ%%!the efL'eetz_ of ]'itch I._tl[|lll._ eulztl'u] (in Lilt, _l)a(.'t,t'l'ai'ti,_ orbital I.!,l'()tlll(I ll'n('l,, II,'il't.
Table .1-1. lamdsat-2 Pitch Position Bias (_uarterly lh_t,umalic Gating4 ,_unlnrlry
PPB hnp|emcntatkm l)uration ('enteredI't_,riod..... Sequun¢c About Satellite Rc,_ullill_ Average
Fror,l 'ro orbit Ntunber Midnight Numb_,r of Pitch
Orbit Orbit NO Nol 1 No-t2 (llliliuLt'.'_l Gates l)cr Day
: 10265 10626 3n
27 ,)ml 77 22 Feb 77 _2.0 0. O 42.0 Alternate ()rbit:_ (; to 7 (_ 1')
;_J 10627 10723 '
_:L_ 22 Feb 77 1 Mar 77 o.o 0.0 0.0 - 12 (_ Ill
1072.1 10919
1 Mar 77 15 Mar 77 2.9 2. 9 2.9 .1,_ 2 to 3 (_ 1))
:. 10920 1122615 Mar 77 6 Apr 77 2.0 2.0 2.0 .t,_ 1 to 2 (_ P)
_:: .........:_ 11227 1132"t
:" 6 Apr 77 13 Apr 77 2. l) 2.0 2.0 50 1 to 2 (._P)
11325 11503
;-: 13 Apr 77 26 Apr 77 ') 2.9.. 0 2.0 ,1s 0
:.. 1150.t 11685
26 Apr 77 9 May 77 +2.9 *2.9 -_2.9 .!s 3 to .1 i-P)
; - .;, 11686 11991
9 May 77 31 May 77 +2.9 _2. 9 12.9 52 (; i-P)
; 11992 12035
31 May 77 3 Jtme 77 _2.() -t2.0 _2.0 50 1 ( l)}
12036 12075
3 June 77 6 June 77 -_2.0 _12.9 .12.0 .15 _l
*_,,) i)1.2071; 1._8.
(; JUllC 77 20 ,hmc 77 _2.0 _2.9 ,2. ;) 5,) o
1..,_3 129(;6
20 .huge 77 ,_ Aug 77 2.0 2.0 2.1) 5i) 1 h, 3 (_ lh
i,S-2 l - I
• 00000002-TSC14
As a result of the ground track drift maintenance program, Frcon Usable Impulse declined at alower rateas shown inFigures4-1 and 4-2.
l{MP2 commanded intooperationshortlyafterACS acquisitionas theprimary controloftheYaw
subsystemhas functionednormally,
Both SolarArray Drives(SAD)performed normallyand maintainedpropersolarpanelalignmentwiththesun llneduring_atclliteday. Motor voltagesand temperaturesarc withinspecifications,
Typically,flywheeldutycycleshave averagedsevenpercentor less. Pitchand Yaw flywheel
speedshave averagedlessthan-150RPM whiletheRollFlywheelshaveaveragedd760 RPM.Sun transientresponsecluetodualscannermode operationhas been normal.
Tables 4-2, 4-3, and 4-4 show typical telemetry. All are nominal
52
R48
44
SEPT£ MBER
40 1975I BEGIN GROUND DRIFT
I CONTROL. ViA PITCH / +P
RATE CONTROl.
3e I
I32 i + PITCH8
x(n
- _ 28 -ROLL
i_.' Iu
20 I REMAININGUSABLE IMPULSE
I16 IR
I12
I '
I '' I
+ROLL +R
-PITCH Io
IO 20 30 40 50 60 70 80 90 1oo 11o t15 120 125ORBITS (IN HUNDREDS)
Figure 4-1, Landsat-2 Gating History
• LS-2 4-3/4
00000002-TSD02
1
i_-i in ID
- 14
t"-q I-,,,4 I-I _l i,,I
_ j i'" " * l°,,J " ,_
r_ ,,-; _' "_ I /1 "-.r-.,-.:- >" "'_,1 L.. I L- I 1 .j"'l _J'l r "-'J" - ..... r
2//,,/,l i. J I / I _ ,, i _-_..:/}j.t
w,.,,..:, $ j Lsi.. '* pTij_i:i_
"£'.N'.. \\.', .
I I i I I J i I lr , I I i Ir I I I i i I I I I I I ! I I I I l I_'*1 ] i I I I I i ! ; I 1 i I I i I I I I I I " I 41 I I I I I ;
1975 1176
" 5
-i"
........ , _ ......._r _,ooi_e.u_tt_.
00000002-TSD03
: IrOZ,Z:_O,z,_,AM'_
¢4
Figmre 4-2. Landsat-2 Gatit_
: Frequency vs Time
"_ 1,_-2 !"5/B
".: OI_IGIN, AI " ,,.
-. '_.,, ............. _ ........, ', '_,_._ .................. I .......... :,._ '......................!.............. !................ ...2 .. .... _:_i'_ _; ,. __J___._:_ .-_._..".r_.,....-o.-, -_..:' ..-- -h.'-'
:' ' 00000002-TSD04
'l _ ORIGINALPAGE Ib._, ,_t__ _ __"_' POORQUALITY-..._- - _-.F-a OF
I !
"" I II
8 _
. • . . . • o . , . . . o • • • • , • o , • • . .
_ ° _
q,_ -
• _,
- __
I,N-2 1- 7
00000002-TSD05
/ t I I i , l I
Table 4-3. Landsat-2 ACS Voltages and Currents
( )rblt
1l"unc'tloll UnltN ,,i "_' " 51o2 76,t 1 I i}191.,I.I. I 1"'7 I 17:1211
1081 liMP I MTll %'olt_ VIX" OFF OFF OFF lll"F OFF +1)11 .ilU olin
1082 liMP 1 MTII Curll, nl Amps OFF OFF (IFI." tiI.'F OI.F . iiii , liil . IIII
"'7 10110liMP 1 ,_Ul_)ly VolI_ VIX' ()I"1" ()I"I" ()I"F ()i"1' O1" 1" -17.5t " l'i. Sli - IT.;,',
1091 IIMI I .'l MTIi Volts VIK' ..I.'" _JJ_ .J°')_'.l.I .,i.'_'.i." ..I."' _i7 "9. _7 L,I."_7 '"-.I. 'j, i "..). 'I I
1092 liMP 2 MTR Currc, nt AnlliS 0.10 0. lit II. lit II. 11 it. Ill o111 . llJ . In
1090 P_IP 2 Supply Volts VDC -23.6:1 -2:l. fil ,), r_ -..l..i,t -2:1,5_ " _'
.> 1220 SAD liT MTR WNDNG Volt_ VDC - 5.47 - .i,51 - ,1.,17 - -1.22 - 4.{)lj - _.ll,i .- t.ll_ - 1.;'11
12.10 I_D LT MTR WNDNGVolts VDC - 5.08 - .t.70 - 4.72 - t.5.t t..',_ 5.15 ".,10 - 1..;,3 a..
.; 1227 LCJkDliT -15 VDC Con,,' VDC 15. 14 15.15 15.16 15.13 15.15 15. 12 15. 1t 15. 1;1
L 1247 SAD LT -15 VDC Cony VDC 15.2"1 15.22 15.21 15.20 15, ,,7 15. 211 15.23 15.22
1056 C LB +_6 VDC TMV "2.35 2.35 2.3i_ 2. :18 2. _._l 2. lit 2..tt} ". ll]
1055 CLB + 10 VDC T,M%' I 2.88 2.90 ') 9 '_ '_ _' ., c "_ ' ') '2.-- , . ..... i,I ...t4 .. J.t ...t I9-I
_. ot c_o *) I -.,: 1057 CLB Power Supply Volta TM3," 2.97 2.9.t " _ 2. _l -, J7 " '_ "' '" "' '_;
_, Table 4-4 Landsat-2 ACS Attitude Errors and Driver Duty Cycles.i
)rbtt
FuncUon Units 26 2532 51il2 764__ IIl19_ 11_71 123_u 177"u
10.tl Pitch FincError DEC; o. 15 - O. ll - 0.13 I- I._8" - 0. a2 - 2.2s - 1.:ill 1.3T
>;; 1043 Pitch i.'lywhccl Speed I{I)M -17_l. 12 -198.41 -li12. !i7 21.t. 1.t 3. :l_.i 200.3" - l tu. _7 - 157. ;15
1038 Pitch Mtr Drvr CCW PCT fi. I;.1 7.35 IJ.05 -i. 2.t 4.3:1 .t. t17 7. fill ,. ,,
1039 Pltc]_ Mtr Drvr CW Pt'T 2.0"1 2. llll 1. _ti} ,_._1 :l. _7 k. 92 3° II_ . II t
1030 Roll Fine Error DE(; 0.13 0.09 - 0.1.t - 0.1,i _i.'-,1 - . Ill I. li.t _, - . 1i
°it 1,1_ _ t I? 1027 Roll licar Fl)_vhccl SPD IIPMI 729.30 7,,J.75 7.18..'_l 7.!2.88 -, ', ',_ 733.92 7il5.7,_ _ 7_5. Ill
"_ 1026 Roll l"wd Flywheel SPD RPM 7ii3.ii2 725.23 7:15._1 721.t1:1 737. 1.1 7.t1.:J4 7"4.511 ! 75i,.ili;
• . .J I1022 Roll Rear Mtr Dt_r C('W PCT 0.67 0.39 0. fi:l 0..II it. _7 55 .- . .li.;I
_ 1025 lloll Rear Mtr Drvr t'W PCT 7.,M 5..17 G. :..t 6.80 If. li!i Ii. :i5 I;. :12 i 7.57
102"} Roll Fwd .Mtr Drvr CCW PC1' 0.70 11.,17 0.87 0.till li. 72 .77 ._i:l i .7.
102.1 Roll l._vd Mtr Drvr CW 1)CT 5..Ill .t.7.t .1.ill 3._t2 t. :ll 3.75 3. 12 I 3.71
, ,it I,I L _lll_ ,l_y, 10:15 Yaw Tach IIPM - 05.73 -t1.57 -:;-.1_; - 11.03 ]li:l.lli -175._3 - .3._. i -
" 1033 Yaw Mir D_r CW PCT l.!i_ 1.77 7.i_1 1.76 1.91 - 1.4_ l.,l_ ". lUI
103.1 Yaw Mtr I)rvr L'CW PCT ') |u 1.72 _._.111 1.6+1 J. lit " 2k 1.1i5 _ :_. 13 i
. 1"2'21,_%1)Right Tach D,;M it. ;,_ '.I. :i_ :I..;_ 3. ',t_ :'. 37 3.3_ 3.37 3. :it; I
1---J 12.11 SAD Loll "rach D,,M :I. I;_ :I. fi:l 3. ,'_l it. 53 3. -1_ :l. 57 3. 5i; 3. ;,t;
+Pitch l'os. ltlli_ lnllllcnlcnh'd llurlng This ()rhll
ORIGINAL PAGE II_., OF POOR _UAI,II"Y I,s-_
4-8
00000002-TSD06
' I I ' IT
, !| jpi
m_
m_
m.
m_
t
w_
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SECTION 5
_' COMMAND/CLOCK SUBSYSTEM (CMD)
-- LANDSAT-2
"t
00000002-TSD07
!t I I 1 ! t I ! ': Ii
! SECTION 5
COM MA NI)/CI,OCK SUI;SYS'I'EM (CM D)
The Command ('lock Subsystem operated nominally in this report period. 1.'igurc 5-1 shows tilehistolT of the S/C clock drift since latmch, I.'[gurc 5-2 shows file cumulative ehlck drift, 12° 502seconds faster in 30 months; and I,'lk_.lre 5-11 gives drift rate of S/C clock, Im average of 0.9x2
msee fast per orbit. In this period, the drift rat_, is tm, reasing and is tit thu avcragc rate of I. 2_:1msee fast per orbit. The clock of l_mdsat-2 drifts in opposite direction from the clocl, of l.andsat-l.
Table 5-1 shows typical telemetry values since launch. All arc nomimd.
+3000 +2844_' +2 504
i ,: +2500 I +2178 A
° .. _ +2000 I /1<,, /i®= .= ,+=1"I I_ I_ +1720r. _ o_ to = /,
, _ +_50o . I,.. l= /o-
,,x I F-- Ig _"g RBIT 12733I_. = " =z-" g +Iooo - In" Io o =
_ i I?/ l/ i/ I/ __/ V' /iu +500 I +_,l"' hi
i J_ GMT F +1178 +158 +143; _ -500 -1
Ld -782
F- -lOOO
• _' _ CURRENT: -1500
; _ f * INCLUDES ADJUSTMENT REPORT PERIOD
' _" FOR INTERNATIONALL=' tO -2000 TIME CHANGE (GMT)!..
-2500 I I I I I I i 1 I I I I J0 1 2 3 4 5 6 7 8 9 !0 11 12 13
ORBITS CK103)
o
Figure 5-1. Landsat-2 llrift lllstot3
5-1I.S-:,
00000002-TSD08
- 14
- 12 12.502
4
_ _Jr. CURRENT2 REPORT
PERIOD= ._ I I I I I I I I I_: I I IO 0 1 2 3 4 5 6 7 8 9 10 11 12 13U
ORBITS (IN THOUSANDS) '
Fit,'arc5-2. CunmlativcClockDrift
--1.4
--I,2 1.283 MS/ORB
_,.0
_! CURRENTREPORT
J PERIOD_ I [ I I_ 1 1 1 l J 1 I .... I I I
0 I 2 3 4 5 6 7 8 9 10 11 12 13 14
ORBITS (IN THOUSANDS)
I.'lt,,ltrv 5-:_. I)rift l{ate of 8/C Clock
5-2 1,,_-2
ii j _ I t I I i '., Ii
i ................ l i, ,
_ o el
i
1 '
. _ _ _ I_ _ _ _ _ _ _ _ _l_ _11_ _,,'_,,_ _I,,,,,,_,,_ _ _ _ _ _ _
LS-2 5 -3/4
ORIGNAL PAGP,I_, OF POOR Of rll ITY
00000002-TSD10
! .
',' t_
SECTION 6
, TELEMETRY SUBSYSTEM (TLM)
...... LANI_SAT -2
mlb
:j/ I I , I I ', i
ORlo PAO! . : SECTION(i I)1_]I_OR QUALI2T
: TELEMETRY I_UII_IY_TEM (TLM)
The TLM hat_ operated noniinally in tiffs report lx.,rlod.
tj ,q'al)lo 6-1 SIlows typical lelemetry vnluo_ since hlmleh, All are nolntnttl. I.'unctlont4 I,.t,,| (Thovnu,I Shl,,hl 5
Tenipct'atttrc), 4002 (MMCA llottrd 2 Tvml_Ol'aturo) and 13200 (APU 2,1 Volt |nput) wt, vt* doftq,livi, hvhu,,,
launch but verification of tiles(, functl,ms I_ /IVCOl)ttilfl¢; by adjav(,n! lt, llllK, l'llltll_, mid tlowlli-i|voliln v, dl:,r,,'
: measuroments reslx_ctlvely,
The memory section of the telemetry lllatl'Lx i'omalns In the 0.0 Inod(_.
:, ,, Table 6-1. Landsat-2 TMP Telemetry Vahtcs
_ Func. i Irbit
No. Function Name Unit 35 2467 5091 7,111 Ill, 192 ll_7l 1232(I 12712
9001 Memory Sequencer A Converter %'IX' .l, 45 ,l. 45 .l, .15 .l, .l ;_ .I..t5 .1, .15 .I, .1.5 1, t5
9002 Menlory Scqucnccr B Converter VDC ** ** ** ,* ** ** ** **
: oC_, 9003 Memory SequcncerTemp 20.00 20.77 21.37 2o..16 21.31 19.o5 19.a.t 19.,,:'
,' 9004 Formatter A Converter VDC 4, 52 4.51 4...5" 4.5o .I. 52 ,l. 51 .l. 5o 4.51
)005 Formater B Converter VDC ** ** *¢ _, ** ** ** **
9006 Dig, Mu_ A Converter VDC 4,22 4,22 4.22 1,21 1.22 4,21 4.22 ,1.22
!=_' " 9007 Dig. MUX B Converter VDC ** ** ** +* ** ** ** **• ,#, ,),,., _ 24.2G .3..3 _2.1..t7
! 9008 Fornlatter/Dig Mttx Tcmp °C 25.00 23.91_ 27. So .... J 1 29.75-: i_ .1. o5 .1. o5 |.uS
1009 Analog Mux A Corn,error VIX" .1.02 .t. 05 .t. 05 i. o5 i. ,t._
9010 Analog Mux B Converter VDC ** ** ** *"- 4, 03 ,1. o3 t. u3..: 9011 A/D Convcrtmr A Voltage VDC 4.02 4.02 .t. 03 .1. o4 .I. ut
9012 A/D Converter B Voltage VDC ** ** ** "" **:. ' 25.It0 2.1. 711 25. U1
_.-_ . 9013 Analog Mux, A/D Cony. Temp °C 25.00 2.t. 91 27.33 25. ell 27.,t.t,7,. . + 4. O(! 4. U0 |. m)-. :. 9014 Preregulator A Voltage VDC 4.00 4.00 4. co 1. co .I. till
,, 9015 Preregulator B Voltage VDC ** ** ** _ ' **: ...3. 21.77 ....,
' 9016 Rcprogranlmcr Tcmp °C 22.50 oo "7 2.1.7,1 21._9 25.17° _ 7 .1..t 5 -t..t 5 1..17,
! ,: 9017 Memory A Converter VDC 4.45 4.45 4.45 4.45 .t. t5 ts. 75 16.54 l,;. 51
z ,9018 Memory A Tcmp °C 17.50 17.33 17.17 15.fi2 17.lii •, ,. ..
- 9019 Memory B Converter VIX" ** ** ** *¢ ** 15,97 lii. 77 Ill, 7,1
__ 9020 MenlotS" B Tcmp °C 17, 50 17.2_ 17.-I 1 17..15 17.5u 14, u:l 13. su 11. u.
i .:.,, 9100 Hcflcct_._t Power (Xnltr A) dBnl 18.29 13. (;t_ 14.18 13. _ 1.1.53 3.97 3.97 3. :iT
"<. " 9101 Xmtr A-20 VDC VDC 3.80 :1.98 :1.97 3.97 ;i. I*_ *.... *
' 9103 Xmtr A 'l'cnlp °C 27.7:1 20.97 26..Ill 21. {m :ltl. 37 21, 3.t 21. "7 21.92
910.1 Xmtr B Tcmp °C * 22.07 27.7.1 22. 13 31.7t 22. :is "2.3_'_ 2;2. 'J!,
.I,,.,I ,, , i :211. 19 " " 2fi, 3u9105 Xnltr A Power OUtlmt dBnl 27, 73 2li, 19 " ' ')' .it. ],l 2U. i 1
-_- , ' " 911)6 Xintr II Power OutpUt dllln *) ** ** **. i}j .....
i_ - ', _, *Not llvlilhibh* dtu' to softwiii't'• *Not iul'nt,d till slnt'o lll'l,|lt/inch
!
.,o LS--2 13-1/2
im,
o_
• .. , " ., " - ...... _-.-::-.,_...'_, =. , . - ..... :.. r........ • - .. t_ ...... ___._._..l!.. ..... -. . __.2_.1......... _-:._:_l._--..-._--'_i .......... - . .a..__.____.._..._-.i..-..,_ - - • t.-- _- .. _ .." , .... " , " ... "_ ._'.. '., ° t', Y -- ,.. ' .... .
00000002-TSD] 2
.° ,
m,
SECTION 7
ORBIT ADJUST SUBSYSTEM (OAS)
LANDSAT -2
m_
v..
\
00000002-TSD13
' I ' I I I , IN
,";E¢'/'1( jN 7
lbl¢l*,ll All, ll 5'1 ,_l'lLk, Yhll .M It,A>)
/'hd' IIl'ljll I_dtll;_l _tljjtl_li[l'lll |Ill I.;lllcI_;ll-_ hI_,l; }11'1'11 Illl'ai I('il Ill V!, :,11t1', l;Iolll h, I, Ill, I ' ,,, II, V Ih_ :'.
IhFL_B|I'I' _lllo[ j I|llllq_ UBIIIlt_ , |ht' '_ I_II'Ily_|VI'. I)jlt. _II'|HI _, I_j _1"11' _'. 7¢11, l _', _}ll Hbl! I ,:iq I_ '?.,I I'll ;ljl, h' , )
|}jll¢' dltV _l'(lll||/I l l'IIl'l ¢, I'_'l)l':ll I_llt_'l'll, Thl'_'q' X Ill IIIl.¶V _.',_'1 I' I,_1 "1 I,ll I_ .llll|l |l:llll I'.
NI_ Ill'lllP, Ill III1' ():%.S _,',I1:4mIl, h' dlll'lllR Ihl:; I o'lHIl'l I'o'l ll.I (_'_'I' _t','ll,_/l ' ,ll: _j.
|'hi,_IIl)l.IVilt*,lllill'lIVll),_ _Int'l,I;.lllIIVIl|H _Ilnlll1:ll'l_.l,llill'l':lhh,7-I, A l,_l;ll,,Ir_.47 11,1,.,,IIi',d! :,,'In,I.
I_t,_,ll t,xpt, lldt,d ,go fill' I1'¢_1_ Lht' pl't,-ltlllll_'h h*:ld .l I;7 |h_,
'1'}|(' I)A8 I(,li,illt,lry }1as t'onst,'.itt,llllv nhowl| iI(ll'tnIll pl't.'bl,qUl'(' I('II,III'I'ZlIIII'I I,:ll'Iilll_ tt I'.",. A . :llt:l,]lln ,..I.,
( _lAlllt' i,,.I _IVq.'I1 |Jl Tal)h, 7-', 'l'h(, VIll'latJ(;lIH ill tht' lhz'u_t uhan_ h,r Li.II:t_ rIltula/,,-. In lahh ', " :_r, , ,,r : ,
_ ilh tilt' Vtll'latl(Hl8 bl Still ilH*'llSlt% ;tll(I ,_tlll ang'Jt'.
'I'ahlt, 7,.1. l,_uxlsnt-2 t )rl)lt -'_dlU,'q._unima_5
Orbit I_urn Engine I'u_ l I '1am, 1 ,mh
I AdjUst Ignition I)uration _ Aa Perfornmnce _ _,d Pr, ._ur,. I ,'rap, ra_ur, : :,r_ ,,,_rb|t No. Epoch ._econds_ ,M,,ters, l".ffh.lt, ncy ,l.b., ,1,_-I \, ," 1 , _ ,
32 l 25 Jan 75 .I. _ 39 1 _1. '_ ,u._)2 5:t',. '.. 72.,_ -'..
_103.1 _0. ,.,7t 2 "7 ,]llJl 75 I. _ -:ll; !oIl. 1 q. "2 , ;7. i I; 7 ,. ", ",,
l _,_57 n0,
79 3 2_ .Jan 75 420. o 3155 1._7._1 1.¢_2 517. i,: 7';.., ',.
| 09 ,t9 00.
'_I; 4 28 Jall 75 120.0 32;1:1 1,17.._ 1.51 3o2. 1,, 73.5 .21 13 00.
lf13 5 3 t'cb 7G .120.0 -2"71 '.,7.u I. t2 t_i.. 75 "5.,, ,i0 3/;00._
i 191 _ 5 Feb 75 :1_1_1._1 -'.'421 ',7.3 1. 15 13.. 71 7",. ,, '..I0 51 00.8
I 0 ._ , ,I, 72_.0 '.
_l_ 7 G Feb T5 30t_, _ -20I)9 !*_. ,; 9;) | I_i. 2122 31 00.
I_0 _ 2G Mat' 75 12. _ '_2 luT._; 'Ln_ '397. 17 7,h :_ _\,
[ 21 14 O0.s
rI 1_'32 I_ 19 May 75 24.0 • 1r,I I ,_7. ,_ n. n7 _ ,_1.21 7'_. :, .I 8 54 00. a
2958 10 22 Att_ 75 22.0 14fi llu. 3 0, 07 404.96 73.5 -X22 II 58.t_
1
Initial l.'uvl Capacity - _;7 lbs.
t
I.S-2 1
, I .......1 ................, ....................................',. ............._ ..............................:..................._,i........i...........i_......._ ...L........_--_---!......... ':..... ?'_,""--"-_"....
.......;, .-......._._.?--._-_.....;........."..,_-,,.............._....._ .....,=W"..........."_.'-........ .00000002-TSDI4
! f If I ,,, I
]],
,,,-_
m_
,w -
SECTION 8
MAGNETIC MOMENT COMI:_ENSATING ASSEMBLY (MMCA)
I_NDSA T-2
m o
Z
Q •
.L
6_
m,"
OI
m_
O0000002-TSE02
• I ! !.
SECTION 8
MAGNETIC MOMENT COMPENSATING ASSEMBLY (MMCA)
The spacecraft was corrected for unbalanced magnetic moments inorbits 293 and 321 as reported earller.
These adjustments were made on the pitchmagnetic rod ofthe MMCA.
No adjustment to the MMCA dipoleswas made during thisreport period.
Orbital averages of MMCA telemetry functionsfor selected orbRs are given inTable 8-1.
Table 8-1. Landsat-2 MMCA Telemetry Values
Orbit
Function Name UnRs 50 2t_32 5102 7641 10191 I1_72 1232 ° | 27."1;
,,, is
4001 A1 Board Temp "C 20o5fi 19._2 19.47 19,20 1_. 1: I,_o _3 l'J. o;: 1 _. 7,'J
............... 4002 .... A2 Board Temp * C * * * * • • * *
: _ 4003 Hall Current TI_Pv' 3.40 :1.40 3.40 3.40 " .i. [i, ....... :L40 :1.40 3°40
; -_ 400i Yaw Flux Density TMV 3.05 3. o7 3.07 3.07 :;. t_7 3.07 :1. ()7 3.07
4005 Pitch Flux Density TI_Pt" 3.15"* 2.90 2.90 2.90 2. '.,,, 2.90 2.00 2.90
': 4006 Roll Flux Density T_rs' 2.99 2.08 2.97 2.97 :._,7 2.97 2.97 ".97
• Defective Telemetry Function (Pre-launch)
• *Post la_¢l_ _l_ot,_y drift.
LS-2 s-1/2
i
OOOOOO02-TSEO3
/
" I ]
SECTION 9
"' UNIFIED S-BAND/PREMODULATION PROCESSOR (USB/PMP)
Q
., g
m.
: ... ," "
o,
e
O0000002-TSE04
1 I + Ii '%-,, I i i
SECTION 9
UNIFIED S-BAND/PRI':MOI)ULATION PHOCESSOI{ (USB/I)MI))
The USB Subsystem has operated nominally in this rupotg period.
Table 9-1 shows telemetry values since launch, All are nominal. I h(.transn_ittcr has maintained
a steady indicated power output of about 1.4 watts since launch, l.'iguJ,t)-Ishows AGC rettding._tJf
Goldstonc for 2 constant positions in space, The scatter of data imlnts reflect variations in the
ground station calibration and readout,
-78 as QDRANGE = 1068 KM
-82 AZ- 307° gEl-= 57° O
° oo o • o-86 a a u a • nO a
o o •-90 o 0 a OooO Ct
o o 0 0oo
• 0 O0 0 0 o
-94 ' o • iOoOOO oII a,m _+ v• •
-98 • 0 • 0 0Zm • 0 • O0 0D •I +-102
_< RANGE., 2152 KM oAZ- 90°-106 EL 17°
- 110 CURRENTREPORTPERIOO
-114
-118
I i i l I . J i l I I i J0 4 8 t _ 16 20 24 28 32 36 40 44 48 52
CYCLES (OF Z$_ ORBITS EACH)
Figure 9-1. USB (Link +t) AGC HL,ttdings at (;ohlstone with 3o' Antcnlm - 'lJxndsat-2
t,S-2 _t-1
O0000002-TSE05
I I t " •
-il
I t
g,,I.
i
[.
SECTION 10
ELECTRICAL INTERFAC E SUBSYSTEM (EIS)
.it, LANDSAT-2
.t
"tl
?
O0000002-TSE07
=i SECTION 10t
ELEC'rI{ICAL INTERFACI,_ SUI_SYSTEM {EIS)! LANI)_A'I'-2
The Auxiliary I)roccsMng Unit (APU) con_l_tlng of Search Traek Data, 'rime c'utlt, Data, and Back-up Timers operated satl,_faetorlly throughou! this report period, Telt.metry l_,r the A|)i ' i,_ ._hottnin Table 19-1.
Table I0-I. l_mdsai-2 APU Tclemettv l,'mmtlons
Orbit
Function Description Unit 21 2532 8102 76.11 10192 1i8-10 12340 12720 _"
13200 APU, -24.5 VDC TMV * * * * * * * *
_ 13201 APU, -12 Volts TMV 2.42 2.45 2.45 2.45 2.45 2,45 2,45 2.45
, 13202 APUTomp DGC 27.44 26.60 27.70 26.21 2_.78 26.'>9. 2(;.02 ,6"'.,0')
• Defective Telemetry (l_elaunch)
The Power Switching Module (PSM) containing the switching relays for power to the OAS, MSS,_! WBVTR No. 1 and No. 2, RBV and PRM, functionednormally.During this reportperiod, the
; MSS as well as WBVTR No. 2 power circuits, have been operated on a re6mlar basis. RBV and
_ WBVTR No. 1 power circuits have been used for limited operation.
The h_terface Switching Module performed all ._witehings normally during thi._ report period.
* ,)
t
O0000002-TSEO8
]]
J
,,mat,
: i
..... SECTION 11
' .. THERMAL SUBSYSTEM (THM)
_, LANDSAT-2
J
_,,
v'
= .15! ,
o,
O0000002-TSE09
l ) I II I I
SECTI()N II
'I'IIEIIMALSUI3SY.WI'I.;._I('filM)
Tht.The,finalCcmtrol Mub,_y,_temis_l.;md_at-2ha,_pr,wldt,,l,_atl,_f_wt_,iTc,¢,i_tn',d¢_fall ,_l_:_c',,_'r_,li
eclulpmcnts_Incc,launch.
Table 11-1 g_ve_ avcl'agt, subsystem tclemt, try value,_ l'_r ,_c.Vt,l'_ll rt, i)rt,,_t, nt_ilivt, _rhlt: ,lurillg lht,_$(1I]l()l|ths of opcrtltlon of Lluitl._at-2. Avt, l.agt 0 tcmpt, t-attlrc,,_ uf thL, ,_t,n._(._l'_ I'Jllg h_t%',_Itl't, idtJllt,,I
in l.'|l_mrc 11-1.
l)uring thi._ n't,port period, the ._un lnt_,nlslty varied from q). :J_J to (I. _.)(;IJuf tht, m_,;m value attd tht,average spacecraft tcmpcraturc._ clccrca._ed. _"
A history of compcnsation load switching ,_lncc launch is shown h_ Table 11-2.
71:. ORI{]INAL IS
OF POOR UI_;Ayr_'
lTable ll-l, LlmdtttlI-2 ThermM+ P.ahmdlttem Aim.log Telcmct W (AvtlrlxKe Vltlut., for FramcP_ of
Dnto l+:2_.oivcd in NBTR Playbttck)
...... ..............IMm_'II+m F ttill.| i_j)_ .......... t+rl_tt_. , --Nit Ilt'_, I I|il,,ll I lilt ,rI ,'_ I,' +|,1,' ?_,'| ] I1_1_t,? l|_ It)
-_ -I::TL.,_.__. ,.- ,,TI101 'IIIP+I I|l+ll h]+l ]J(+l lid la_ 10 t,_l l!I '++. l+s.a, I ',!l I% l I I-_+.+,`, -- _,+ 1
I70O;I llllSl 1'11o,! gI1(l liT+ 17 |Is I"._11 17 17 l? 111 l?.lil+ I';+71, I ,
7003 TIIM ]ll(l'l l_'I+l Ii4' l" 71 Ill I'I I" ,il 17+7,I It+ I,', |% |1 I", +i i , ,+(llbl filM +I'II10 'l('II Im_ l!i tI+ |_I +II I" II l'l,lp.I lit 'II I% +" I'++ l" I+,.70Oti IlI,M 'llli+l t111 Ill+' I'+ ill 17 tt,+ It, 'It, |l++:l+l lit l,, t. I;. _" la,.
_llll_ TIIM +lllalS 111111 11,1' 17, |' |+ ll, Ii, I,+ II,.+,,' dt'l'l 11,.,_ i i ,7, l,+ .I711117 (IA-+_ Tilltlt*l¢,Ir 1144' Ill I111 •'11 .r,m I!l l,'t +Ill,If+! I'll I,, I'+, ,, L'P. l,
_O0# TIIM rIllMi-P;'l'll Ill4 + II 7m II 7? l, Ill l'l,?m ,7 l,+,t,, l,, ,+ i_, _'
?111111 'IIIP.I 'I'II(10 t4111 I"_(" 111 Im I!I Im In II lU III, Ill 17+'l_ I ,'+I I ,1 1
711111 rll,_f HIll? _1+1 lli+_' Im tlm lm .'I_ l? II IT,+d+ II l",,i,,l It,. +i, ', ,
71111 TIIM Tllo+i P++I+(I li<4' Ill l,I ,'II .'+p lql +' I III,T,I IIII I'I,,,I, l'p,,'l I++ _+
7111J 11151 I•1109 P+III 111_' .,I "II .'I rot+ +,I r.11 +o lim +',_,+.14 ,'+_.<,t, ,_,,'+.' ',, +,T01',I I'IlM TIIld P+BII Ikll l_l ,N II+ ,rA, II+ ,ItI II_, II% l+q.%+i l_,r,T I',.. + I,. ,,
7014 1'11%1Tl||l ,+'¢'1'1 I_l_t' .'l I)% 21, l'; .+I !it '+O,t_l _Z,'_+_ _tt.;t- _"'. l.' .,,,.,
TOll+ T]IM TIll2 P_|(I |)i_ • ;Pl oi _" II ,;I l,k _l, _13 2(_,1,# 22. o'+ .'1.I ',' ,,. +
?017 llI_% Ik+l_l t'Ir 1,11 II4K' jo,,ilq 2o,;I,1 l!l !i+, _Ii+11_) J(1. lli i_._i I_. +._ I-, ,_?0111 TIIM TIll4 8T<i DI_(+ +4 I" +'I ,_t+ •'+, l t 2l.,Io _li.li4 21. l.l ,'l.:, , ,',', II
7010 NIIII llafl (lutl)<l Ill Dii(' _ 7.' :I, Jll +' !It J.;ll J.44 ;_,+:'; "+"_ i,""
I ?0_0 FIIM TlrlfJ 14111 DI_(+ _;|, 0? _| I:| 2,+ :+f+ 10. II 117 ;_,+,++, _'i,, +,:, ,'I, +"'
7021 TIIM I1111681"I DI_+" 2:1 _lJ 22 ._+.I .:!+,,II+ _It.|17 2t_,+S? 21+21 +'i*'+'+ 21+ 1, 7022 TIIM Till7 |+Ill Dt+(" Jl ?T _l•J 2 J l 71 20.31 221.75 72,_.;'1 +:'+.'+', I+',',
702:1 T;tM TIIII_ t_O Dt;I.' _1. ¢)7 _1..It) Z:l .0, _ll+.:+0 :+:l.li9 2r+._% -'+:+,_" . t. ,'70.'IO TIIM TH03 But" DI;£" 7%. r_ll 111.211 I!+. l| II+._l I5.M| li,.'., |1,+ "" I',. 1"?0.a:l 1lilt +l'Ill2 Iktr IX_t" 2:1 <15 _l TO 21 :,+.t _1,44 27.14 2.,,, +, +:i. I ,:l. ',_'_
L 20_I+_ TIIM Till++ Ilttr IX+t' Ill _:I l_l ;12 _'ll Ill |9.0f, i Jtl. J0 I% _', l,+. +' I.. %|?040 ?TIM TIT01 T(+'11 IXR" l;l 12 |,+l,?. I,L +. + 16. U.,+ I|l. tlI_ l. ,_+ I '++.," I'.'.
hr, 7_ I TIIM TIIO_ "IX'D+ DGI--" 17. '%5 IS. 0;2 17 ,It. I?. Illi I 17.4_ |7. _)7 I:. I" 1:. '".704= TIIM l"HO:l 'l+_B DIE" IlL .5 Ill, 221 lh ,12 10. :I? IM. 114 | .. +,.i +.+ ; I | 7+ ; -704:1 TIIM TIlO.l IX'b Dr;(." I+.I,O11 211. I15 I'l II |_+_1 Itl+l,l_ l_l+++: |',.+ I 1_.).,,17044 1+11},ITIIo5 TI.'B DI_(+ lli..++_ IlL 21 15 7(+ I_.47 1+,.44 l_. ',', I ,. I,, I ,. +,,
I ?04t+ _'I1M THO_ TI.'B DIa." l?.?l_ I_. l_ 17 A.I 17_.1"74 t?.l.1 1_,+:t IT,",, 11,. ,".. , 71146 TIIM rllo9 "1+(.°B D(I • It) ,ill l;l..tl i+t kl it< l}.+l I?l. IS2 Ik.;_+, I-. +I l'+ ++'
?o4s TII.M Tilt! Tt'B Ix+(." +'.|, _2 2:.4t) 72,t.71 Z2.o? 24.!,9 2:. 1,, :|+" .',:.'"
o 7049 ?TIM TIIX_ T(211 D<;(" 2;L n-I 211.0_ 2,I, ttl ._l,. ;|4 26. I_3 .it. 'l.t _:,,. , .,,....+ ?0_0 TIlM Till+ T(+'I+ Dii{' 2J. Pill 21l..|l _4 t,7 -111.46 J?.l+l +'alo,| , 2"* +',. . n,. ":
I 7051 TIIM THI4 T(.'B Dii¢" 25 ll7 "+2. lI +IT l,!l 22.22 ;tl. IT ..:.. IT 2.. :+. .':. ,,
70,'_2 TIIM Tlll6 +I_1_ X+(" "2 2_ 21 511 . | ;_l ._ti. li4 J._ liJ *'l. +2+ 2.:. I', • ;. ',705.71 THM Till? I'('1t rK_{" "4 ,2 2+2 70 +'l .*, 22. ?'+1 ;:_ t_ ._. !t_ :._.',; . _.t,ITO.+_I TIIM Ttlle T('li [ItK+ +20,ili 20 0:, d0 !,!, 20.3? 2l+,II 1%77 2"._I l% '
' 70110 TIIM _JIl_tltltrl"l+J), I l)t:l+; 22 71| ;24 't.) ;I,.I,., 15.4_1 27,:16 1 ,+..t ltl.;l| It+ ,t7061 TlIM_lttlterB_,2 DI.I; 19 ,It +24.75 Jl II IT.f,0 1?+e¢9 IT..*, I_. t_+ IT. 'l
706.71 TIIM +%ltL_L_.rB)' 4 l}l:(; I t .9 ._lJ. :172 .11. ,_tl 33.02 712•911 :l _. :,'. ,_1. -I I _,_o. +4,_
7064 TIIM _Itltter B 5. 5 DEL; 7 _+,II I_ 07 ;. 0,1 2. t_l_ .o - i. '_ +2.,,7 I. ":70_5 TII.%| _tutter By 7 D!.:(; 17 00 J_'. 5_ 1|,11 ltd. 116 tl0_t1+ 11+,')7 |,,. |'t ".l"7111"/ T|IM +tlttet B+i 9 DE{; :|.i 7'+ :t++22 I* I12 33.75 :|:I, 70 :II. i,_ +'+2°.' I P. t,
,.,, ?11_11 TILT+1+"_utk.r 1_ 10 DE(; +l*/ 41_ ,14r_ 17 I)!1 :i_l.;|J 411*1J4 ,_11_ ._t_._,, t,ot
t ?069 TIIM _tutl_r B)' 11 i DE(I 5+' +_:_ |1| |(i 17 1!1 I 3o119 22. _ll t%'lt, ;I.I : "o "1
70?0 THM _ltttter By 12 DEt_ ,;1 :_ 41_ 211 1_7, |1, I 4++,.%11 _(177|1 -1".4" 4: +"l |% '1,
, 71171 THM I_lutler I_, 1;I DE(; li'l i,u 4r, ?1 ,+ *t, I 4_..tb,lt}. 22 I 72._11"_9!11 47.:';,_.la ._',.t+'°II,,. t1'%'"I.,._' _UC_ IHlkt_Ixtlt_er I_' t4 ; lit+t+ .,!I 4-t 4tL4,1 +,. ,lI,
..,: ?07;| TItM _hllltt.r It'+ 15 DEI; 67 7+.1 ft:l. ?+1 '+2 _ 4++.0'_ +1:1.*+T %.1.4 . ,'.to 1+* , ,. I"70'14 +I_IM _lUt1_,r By 16 I)}+_(; 4E_ _'o -|,I1611 li| 14 :01. :+r, i |_+:10 14oli'_ Iio I" ,a,. 1'
': _1 701"5 THe.! _l_uttt.r B5. 17 I)t+:(_ $7 +Ill _,2 111 +77 I_+; ¢)0°l_ li_.li? ,t5...t ., I+ "1 ' ,, *
L ?0?6 TIt_+I _ult_t" B1 114 |Jr.:l,; 4(I.4!t I+., 12 IlL kl 40.4? 47.4tt _,l+T,t 12..tl , ....
?0_0 TtIP.t(_t T Zont, r %' Xl}t" t..,, 4 17:+ t _, **.IS% 47_% _._•, t..t, ,,.o70111 TIlMq= 'F Zelter X ++IX" 4 tII i |10 4 !lll 4.q+_ 4.911 ,l.+It, ,|.'.li, I.%''?0_+ ,TlI.%I +_3T Zel_vr %' %'DC ;+ Ish p),_'_ t_ 11:, ',+.04 :_.t14 +',.tt'A ',+".+ .t
?0513 TIIMQI _t _.pni0r V %'LM+• ,I +.17 4 BIt I _lll 4.91_ 4o+.Ni .l.tl') .I, ''I, I._,
I ?O1_4 _H_| t_'_ {4_+_tlt.P 1%* +%'t_L_ -| t)k 4,tlm | !I!I 4,98 |.+.IS I.!" |.In+ I.',-- : 70A5 I+IIM_3 + Zt,ner % %Dr' :, I :_ +, 1_, , I , 5. I++ ,, I+, ,. I', ,. I_ ,o +,
?0_0 rll.%l I'+_M ._tmmt DI_ ;1 ii_ _1, (l_J +_171 1_1.ti:| 21 +29 l_+. I I }'lo"i I 'o1":- : 7091 FHM |I_I ._illlt_+ Ix_(' l;. 7:+ l+_ 1111, 17 #| II++,';_ 111.+.I1% ll;, %', II,o ,,." II,. :,'
o Tl_t PIIM HBX l{lldIMor l)t£ + I_ iiI l_i ill Ill _I |4.41_ II,,71 I|o; k II.,:J 11.
7003 FIT|it It11%'(" £'tr Bm l)q_' -,i ? I 2u _ |!' _l 17.91_ It+. 44 I'. 'i +:.',| I:. ,"
I ?694 PIIM WIIX+I_I Hm+t DI_.' 1.1 7+ 14•, t, "2 It, _+I+ I;I.!O1 I;:. I++ I..II I+.'"T095 I'II,%I%%q+%THHa_lt'l IX&" + I74 I !+!+ ',, ,, ;_.21 4,1h loT,+ .t.;', ,;,
, 71_111 I'll+%|Vi'l+%TII 81r_p I14_ • l:l !III If, tl+, 17 I,,I 13,1 _ I,p.2_+l I,i.:1 I 'o7'_ , ,o ,'
I TO_7 [lIM_l_%tt 1_% 1 I+_',C "2 91 +2 It, +.' t_l 21,211 ll,,17 I',* || I'..'4 I',o'_:_. 70911 rlIM %%'BP_Itltl;itv I DILL' .,+, ,17 I+.I 211 +2,+,II lm,?l I,, +'I II+'" I',. "+ II,"',T+, Is I. II;•¢,!t IT. T_I I+', ,++ I '...t,, I_, '
7099 rll%l Wll% TIT _'p .I l_(_' l" lit I,_, 2J+ +_ I"+ '+ +,,. t.'L 7100 film WII%I'll +tlt_ 17 DI+(' Jl ' I . :,+, 2.i ,,1 1_.'.tl++ -' * '"
,.. ?I01 PII+%IWI|_ Tit 1 t'(,nt Did' -._ 1:_ .!1 11 . t 7_ It++',!l 211+_L; I% I" 1", _" i °, "
I 7102 rll+%t_VI_XTll2 l_a_' DI.t" 17 +t 17 I;!, I + .", 11;, I% )7,1,| 1' . I }.. ' ,i.. I+
o 710:1 I'II+_I X%11_TII12 11315 ll<A' +I :+ 2,1 ll_i +" +' It,.ll ",i, ili I'_,II :"+I i i"+
TII_I FII_IX_q_ FIt+: ¢'|1' 1)t_" +', ?| .'1 i,+ . ,I _7.?:+ I!t._t t .t- i'._ X . ,
710P+ I'111%1.NI|+TI! II _l+•pI_ llq_4 IT "+' I: !,I. + +,, I I I I?.+:_' I' • I . ;'. , i' . I;
+1_ PIt%I _;141'1t I+ _'p I l"& : I1 't, :t_ . . 1',.'" 2t ',2 I',+t, ,'%, I +',.71117 I]I1%1NIil'It Itm ('tl' Ill4 +,, '+ +',1 I| . I • I I Ira' :It+ "_' '" i'.." )°. : t'•?IOA I111M ._tSN.%|(1_tnt14 Ill_( %'I I'+ t" +' +' It+,2r' 2,+, ++, I+o ' l'+ ' I'o"
- 71011 1+tIMtl+++- <_' '11+lU_t_,l 111_' ., a,t I '+" , " , 21J Ill| 2,1 il| . .+.,., * ;• , • ++i71111 I|IM 1%|+_S%_II%11( 14111l+t,t' 11, ; • |+ ',I , ! 11, 'I? ll'.i+l I '* I+ I , " I ,
l 7111 l'li+%t().+X'X I+lli-xi_l+,l fill 'i. i, I'l +2 ,' I' 1+',+'" 17 +1 ll,. , I o' i,•i'Tl:lli "1'11+%1,,%li_I'1 'I IW,t' +l i_ I, +l ,, i,+ + t, l,' i,I :+,,+ ,. i, ..
:: T1;11 "rll%| .%ill+I..! '] |i,1' ., _lll +, + L i _._ --_• ,t_ L_ ,. ii, L ,.i. i ' II ''_.
L_-I tl-3i
+' i '+ : !
O0000002-TSE12
I I ; I I t ', nI
Table I I-ft. LaJldmd-fi Compe_l_ldmn 1.4,ud lily, tory
('onq_'n_liti.n I.uud ._talu:_*
f........ F; 'Orbll._ I .1 :, i I 7
Lal_ncll 0 (t (I (l II (i 01 ql
X X X X X t_ X X
237 X X X X X o o o
27_ X X X X X 0 X X
3O6 X X 0 X X 0 o q_
572 X X 0 X X o o X
1367 X X X X X 0 ¢9 X
1645 X X 0 X X o o N
1657 X X X X X o o X
4202 0 0 X X o o 0 o
4372 0 0 X X 0 0 0 X
6735 0 X X 0 0 X 0 0
8312 X X 0 0 X 0 j 0 0
9753 X X 0 0 0 O_ 0 0• Note "-"
X= ON0 = OFF
i' 1 1..t
I ,S. '_
- "__:_................ '_:.... : ................. _,........... _".............. J. i_......... _ 0_ : _ ....... "
O0000002-TSE:I 3
8EC'rI_ )N 12
" NARI1OWBANI) TAI'E IU.;COI_I)I.'.I{S (NBI{)
" - Lands at-2
.a
q
O0000002-TS E14
_ , I t 1 I I I
_ SECTION 12
_;:i' NARROWBAND TAPE RECORDERS (NBR)
,_.' The Narrowband Recorder Subsystemoperatedsatisfactorily throughout the cnttrc period, bothRecorders:-_,_" alternating 1_1Record and Playback m_lcs with a nominal one minute overlap.
'._':_:_ Table 12-1 gives cumulative operating hours for both Recorders by mode, .nd Table 12-2 gives typical_? telemetry values.
Table 12-1. NBR Operating IIours by Mode
-' NBR ON OFF PLAYBACK RECORD h-
_i; A I 1550 10440 448 11102
.,:, B 11550 10440 448 11102
! o_'i",
i"!?' :7'
:5
o
; '" /2
i o ,;'
:, eL
!-- o_
I i
o
" i "
_,' _ _'_ _1 _=_ e_l _'_ I I
•=I ¢9 _,11_I I I
1
,='_ _'_ ¢',,1 '_ I I
"_ [,_ I I I I I I I I"o '
..... " 12-2 l,S-_
I
O0000002-TSF02
tm
,4
o
I
!
"" SECTION 13
..... W_IDEBAND TELEM ETRY SU BSYSTEI_I (WBTS)I.d_I_AT-2
_r
r
M *
!
O0000002-TSF03
• SECTION 13
i WiDEBAND TELEMETRY SUBSYSTEM (WBTS)LANDSAT-2
?
The WBTS has operated nominally in this report period.
Table 13-1 shows typical telemtry values. All are nominal.
Figure 13-1 is the AGC history recorded at Goldstone with the spacecraft successively at the same two pointsin space. The scatter of data points reflect variations in the ground station calibration and readout.WBPA-2 has been used more consistently and is presented in this figure. Values from WBPA-1 are nearlyidentical when that power amplifier is used.
o'
Table 13-1. Typical Widcband Subsystem Telemetry
r
._, Function Orbit
...., (I) Name 20W 47 2462 5091 7501 10641 11838 12089 12340_ 12001 Temp TWT Coll. (DGC) 33.6 34.38 35.00 F 35.63 20.00 19.37 19.71 19.46
': _ 12101 31.2 30.00 37.14 32.16 26.69 18.40 21.35 23.58 21.40
12002 Cur. Helix _iA) 3. 85 4. 29 4.51 F 4.06 F 3.47 3.48 3.49: " 12102 4.56 4.41 4.48 4.59 4.63 4.61 4.69 4.65 4.71
i= '__ 12003 Cur. Cath (MA) 46.10 46.04 45.12 F 45.05 F 40.41 40.41 40.44: _ 12103 46.78 46.42 45.24 46.00 t4.66 44.07 45.68 45.06 44.91
i _ 12004 Fwd. Pwr. (DBI_I) 42. 68 42.83 42.77 F 42. 7t_ F 42.25 42.73 42.48_ 1210_ 43.71 43. 81 43.69 43. 61 43. 56 43.51 43.70 43.65 43.64
12005 Refl. 1%vr (DBM) 27.0 26. 50 26. i0 F 25. 85 F 25.34 26.33 25.32_ 12105 36.45 :_7.50 37. 14 37. o_ 36.50 36.90 37.37 37.18 37.23
12227 Con Volt Loop Strcss i. 54 2.14 1.12 F i. 60 1.60 1.48 1.31 1.39o (MHz)(2)
1222g 2.5:_ 1.51..0.01 -0.22 0.41 0.28 -0.19 -0.24 -0.10
12229 Temp. Mod(DGC) 19.5 1_.51 20.88 17.97 17.71 17.41 19.02 20.22 19.33
:-.* 12232 +15 VDC P_T 8ply ('I_IV) .." 65 2,65 2.65 2.65 .." 60 -.° 65 2.63 2.63 2.63
" 12234 -15 VDC P_T Sud (TMV) 4.07 4.27 3.94 4.04 ;. O; 3.99 4. 05 4.03 4.04
i 12236 +5 VDC l_vr Suply (TMV) 3. 55 3.57 3. 5! 3. 51 3. 50 3.50 3.53 3.53 3.51
• _ 12238 -5 VDC P_q.T_d (TMY) 4.0g 4.20 L 01 ;. 07 4.02 4.02 4. 05 4.04 4.04
..: 12240 -24 VDC Unre_ P_r (TMV) 5. 86 6. 20 5. 66 5. 90 5. 91 5.92 5.87 5.82 5.86
12242 Temp. Inv. (DGC) 23.7 24. 12 23.79 .,o _.. 20. 90 22.18 22. 10 22.99 22.47
5.48 5.42 5.46I
t
.. _o
ii / •
• LS-2 13-1
O0000002-TSFO
13-2
O0000002-TSF05
!k ' 1 1 ' ' 1
4,m_
SECTION 14
"" ATTITUDE MEASUREMENT SENSOR (AMS):: LANDSAT-2
"r
O0000002-TSF08
• SECTION 14
ATTITUDE MEASLrI'LEMENT SENSOR (AMS)
_ The AMS is _ passive radiometric balance sensor which operates in the l.t-l_i micron El band. AMN ToIo-
_ ,_ metry Values are shown in Table 14-1.
The AMS was launched in the OFF mode (CMD 774), turned ON during Orbit 0. and has bccn performing,: normally since then.
Table 14-1. Lzmdsat-2 AMS Temperature Telemet_'
OrbitNumber
i ,.... _ Function Description Units 50 2532 5102 7641 10191 11840 12340 12720
' 3004 Case Temp 1 DGC 19.00 1.9.02 18.68 17.87 18.36 17.92 17.77 17.48
i ::: 3005 Assembly- DGC 18.70 18.71 18.30 17.45 17.97 17.48 17.28 17.09°_ Temp-2
i'
:_ "[,
_o, IN-2 !t- I/2
Ii
00000002-TSF07
! I i ,' ,
!]
]
"t"o
I
J SECTION 15
_l WIDEBAND VIDEO TAPE RECORDERS (WBVTR)LANDSAT-2
I
i
i
I
i:\
I
t
,i
J
O0000002-TSF08
:" SECTION 15
', WIDEBAND VIDEO TAPE RECO]IDEII_ _VBVTR)
WBVTI{-I ha_ not been in use during thi_ reporting period because of failures of two of it_ l{et,ord/lqavhael_: heads (head 1, Orbit 2683, 3 Auh_u_t 197,5; head 3, Orbit 10064 on 13 J:muary 1977).
_l_,vlcc in 1975, lor an tmdetcrmint_l reason, WBVTR-2 stoppc_l Rewind prumat_welv: ont't_during ( u'lnt,! 191;i on 9 June and again during Orbit :1_54 on 26 October. This abnormali_' ha,_ not oceurr(_! ,_ince.
,,._ The power-supply frequency eotmt-do_a_ chain of WBVTR-2 occasionally slips pha_c, increasing motorspeed, resulting in high bit error counts and footage over-runs. Simple operational procedures eorrt'uithis condition wl_n it occurs and normal operation can be l'esumt_l, m..
Table 15-1 gives t3-pical non-modal telemetry values for $_VTII-I and WBVTR-2. Tables 15-2 and 1;',-3showthc modal telemetry values for Record, Playback, I_cwind, and Stmzdby operational modes.
Figure 15-1 shows tape usage for WBVTR-2.
i _ i t 1 I I ', I
')RIGINALPAGE Ib_)PP(R)R QUALITY
!
p.. e=g v-_
L
\
: '_' ' ' "_ i 'r ilaa _ - ................ tIlimII ' ---- ........
O0000002-TSFIO
.I
; ORIGINAL PAGE I_
:", OF POOR (_IIALI'I_
I_-2 17,-;_
• [ °q
O0000002-TSF11
_1 ' i I I I I ', Id
I,*
!_" ORIGINAL PAGE lb
OF POOR QUALITY
. SECTJON 16
RETURN BEAM VIDICON (RBV)
LANDSAT-2
O0000002-TSF13
,. Si.'["l'lf Ib,* I_i
III,."I'UI{N ]51._AM VIDI{'¢ j:', (1(1_\)
'rhl.'uLIl_huLlt thit_ l'_-,l}fil't I}['}'i_}d I¢11\* wlt:_ ll:_c.,_.lIll lhu j'l,_ll-lil}_o I_l_du _ml',..\11 I{ll\ _,l..r:d t_m:, dt0r_nl, tt,,..
I'f-_||t)l'l I'I('I'J{iLI WL'I-'{' lliH'llilliLI, |J.ll{I I('h'.'moll'_' (J:ll;l With Iltil'lJi;ti,
'l';lldl.' iiF-I I.'i_.'_-'_L)'I)Iu;sl |t-'lL'ill(Jll',_' \lihll.'l_ Jill" l.hl? I{I_V :'_till:,%'_4lt'lll, I:dd*':, l(, ,'., I1;-;; hlltl Ih I J'i ,, I_ h
IIIL'|I'_' V;IILII'_-_ J'l)l' llr(,I)lll'¢,_ ]luhl0 :lll{I Ih,;id ili(l{IL,:-i iJJ Ih¢., Ihl'(,{, Ill'\ ( {lljll.|{l:,,
O0000002-TSF14
I l { 'I ! , i
i ORIGINAL PAGE lbti _ OF POOR QUALITY
° °._:- [ Table 16-2. Camera _ 1 (Bluo) Telemetc/(Values h} TMV)
Function Orl)it _J"' ) No. N_tmo Mode 05.1 2;171 5¢;6;I 7¢17! 10157 llX:}_ 121m9 12:|10
l]o]d 0.65 0.70 (). 6.9 O,G;| 0.65 0.65 (). (;" o.(;5
1.t101 Focus I Prep 1.68 1.75 1.7,1 1.¢_7 1.67 1.6_ l.I;7 I.I;7Read 2._0 ').90 2._5 ') _1) ') 2...... 80 2. s() 77 2. _i)
Pt_p IJ._o (I. _1 _1.7_ _).77 0.80 o.77 o.77 _).77
,_': 14109 Grid V Read '_ 42 2..t.1 '_..1" '_..15 2.45 2.45 2..t2 2..t5..... l[old :1.95 .1.00 :1.98 11o,15 3..35 3.95 :;. _15 " , _• 4 ,), ,|,1
).:
. llold 0.118 0.40 0.117 o. :17 0.37 0.37 i}. '17 It. ;t7:: 14111 Cath I Read 0.83 0.85 0.83 * 0.85 0.85 o. _-. ,. _2
°_: Prep 3.05 3.10 3.02 3.02 3.05 3.02 3. o2 .,."o_')o .:
• _! Hold o. 00 0.00 0.00 0.0o 0.00 o. o0 o. o¢J _. fie: 14112 llor Def Prep I. 75 1.80 I. 77 1.80 I. 77 i. 77 1.77 I. 77o,'
_ Read 3.25 3.30 3.25 _ 3.21 3.22 % 25 3. __
_ " 14120 +500 V Prep 0.85 0.90 0.90 0.91 0.92 0, 90 0.9o o, 9¢)
• _.i; Read 4.05 4.10 4.05 4.03 4.05 .t, 05 .t. 05 t. u5
"_-_';: * No data due to slow TLM sample rate (1/16) which does not always get a sampk, for sh_,rt "on tim(.."
, i'., Table 16-3 Camera #2 (Yellow) Telemetry (Values in TMV)
: < Function Orbit
• , _ No. Name Mode O_ 2371 5663 7671 10157 11838 12089 123-Io
!_ :;i Hold 0.54 0.60 0.53 0.50 0.54 0.50 0.50 o. 50.._' 14201 Focus I Prep 1.56 1.60 1.54 1.50 1.50 1.50 1.50 1.5"• 0 0 *) "')_. Read 2.65 2.70 2.65 2,62 2.65 2,65 ..6. ., (,,
. . 9:"
_-'S-i._--_ P1_p 0.75 0.85 0.80 0.77 0.80 0.75 0.77 o. 7714209 GridV Read 2.25 2.30 2.22 2.25 2.25 2.25 2.25 2,25
¢$i Itold 4.05 4.10 4.11 4.07 4.11 4.07 4.07 .t. 1)7
,._,:::, Itold 0.37 0.35 0.35 0.37 0.35 0, 35 0, 35 o, 35.... 14211 Cath I Read 0.95 1.00 0.95 * o. 95 0.95 0.95 o. 95._.
Prep 3.05 3.10 3.05 3.05 3.05 3, 05 3, o5 :l, O5
" llold 0.00 0. o0 o. 00 0. oo 0.00 o. 00 o. oo o. oO_. 1.t212 llor Def Prep 1.85 1.90 1.87 1. _7 1.87 1. s5 1.._5 1. _5
I Read 3. °5 3.30 3.31 _ 3.24 :L 3o ;L 3o 3. :}_)"O1
':__" 1.1220 +500 V Prep i.15 I.20 I.14 I.l-I I.15 I.12 I,12 I,12
Read t. 25 -t. 311 1.27 .t. 27 .t. 27 .1.27 1.27 4.27- _., ,_ , -
,'_::_ '. * No data due to slow TLM sample rate (1: 16) which does not always get a sample for ._h,)rt "on time"
=. ,'.
,i
t , ..
'Tv "_0_ " . , ._ _._ . ,." ,"..,,, ..' ,.,. ...... ' ' s, ......... ' ...."" 00000002-TSG02
Table I_;-,I.t'amera ff:_(Red) Telemetry (Valuc._in'I'3D.')
l.'tuu,tion tiHJit
No. Nmnc, IXh_dc, (ff_,l 2371 5f;l;:_ 7+;71 10157 ll_'i._I l'.'_P,_912;flip7
Ilohl 0.65 q).7o (_.72 o.65 0.69 o.(;5 o.(V/, 4P.(;5
1,1301 l"oeus 1 i_l'('p 1,79 I._:_ I. '_.J 1.77 1.77 1.7a 1.7._ 1.75lIc'ad +_.85 2.90 ,_t., 2.85 'J85 ' .... _"_. _ I Me ' +if_. 3. ;+'."-J
Prcl) 0.75 (1.8(I I).75 11.77 0.77 o. 77 ql. 77 H. 771.1:10!) (;rid V Read 2.65 2.71' 2.66 2.71 2.66 .." "J1) _%7 ..... .. '',_
llol_! .I.(l_ I.18 4. 13 1.1},9 ,I.12 I.l(m I.lqJ I.I0
llold 0.39 0..t0 0..10 o..10 0.40 o. 1o o..to _. 1_, _"1.1311 Cath I Read O, 51 O, 55 o. 55 * O, 55 (}, 55 o, 55 i), 55
• • ,)+) ._+;Plop % "5 3.30 3.22 " "" 3.23 3. "" 3... 3.
Ilold 0.00 I).00 0.¢}0 O.00 0.00 0.0U 0. t)() t).(m..(J. ()21.t312 11or Dcf Prep 2.05 2.10 2.07 2.06 2.07 2. t)2 ' " 2.
Read 3.35 3.,15 ., 9•,. 4., * 3.42 3.10 3.40 .LIO
14320 +500V Prep 1.15 1.20 1.15 1.15 1.15 1.15 1.15 1,15O *)
Read .1.25 .t.30 +1.27 4.27 4.27 ..1. .t,25 .t,25
• No Data duc to slow TLM sample rate (1/16) whtch does not always get a sample for short "gn time".
ORIGINAL PAGE
oP Poor QUALITII
16- 1 I._:_:_
+" .
+ -+ . ,: +,, ,.+::. ::, ---, : ._-%..._ + . + ..:+,,..:, ;,_:.*:_++,.,:, +-+,+ - _+• ,+_.+ + + + o , _ ,] _' +_ ,+, o + _ _o ,_: . I_+ ,+ .,, , _ ' o
00000002-TSG03
i.i
' "! m_
i_,,: SECTION 17
, MULTISPECTRAL SCANNER SUBSYSTEM (MSS)
i....... LANDSAT-2
o'
l I
:....._: :._.__---.- .........."--",-" -L_I!:__' --7-- ..._ •., ,,-7-": _ "_.°:_ ..'_.._'o " , .., ....... . °..
O0000002-TSG04
:; i]0
.,' MUI.'I'I,_lq.:CTIIAI. SCANNI,:I¢ _UIIHYHTI,:M IMHSI
": I 'l'hc, MSN ,_uli,_y_t.,In ha,_ operated nonlhlally Ill tilt. period without im,ident, l,'tgur¢, 17-1 :_ho_,-, thl,,.: iiUllll)pl' of _t'ene,_ imaged at ¢qlt,h geogralihi(, h)uation lhlh quarter, aild l,'ik'urt' 17-2 hh(,l_.<, IIIIIII_,I'_-
HIIII:,(, Illwll'h. In lhest, InilJlS, (llllV tho,_t' _eene._ t'eet, lvlql by 1.... and Pak|blllll gl'OUllil ,_Ulliollb I11'1 '
"' [ ._hown. ._:'ene,_ ll'illlHlilllil'll [I) ('lUlllIIII, liril/,i| and Italy 1,117:o1' UilaI) lll't' IIIll Hllll%li'll,
'l'ablt, 17-1 ._how,_ typi¢.al telemt,tz'y value,_ ,_int.t. l:lunt'h. All al'e nominal. 'l'abh, I7-2 hllow._ the
_i ] hl._l¢lry of _em_or respou,_e to a t'on_UllR input rmlhmt.e h:vel, l,:m'h ben._.r i,_ ._ampJt,d at 5 rml|-anee levels and all ,_lm_v t,,_entlally the _amt, trt.nd,_, only on¢ ° ¢_f the,st, h,vel,_ (the _euoml higlr,._,l¿
is listcql in Table 17-2. Line length hlstoIT is also nho_n ill Tablt, 17-2 and i,_ nominal.
. }
; [ Sun calibrations, pcr[ormed every t_vo week_, _how i_¢lmil_al performance.
,,p
o'.
-° :"A
_ v,
_,, ib
.;: 1,,N-2 17 -1 "2
1
f:,,'l......... '" ,- '........... - '_ nnnnnnno_TQ_-n_
?
4
00000002-TSG06
_ OPPOORQUAMTT•,.._ n,_,_........... .,_,._.............. ,.,,,•.............. .,.""_:................ . ................................ ,
iZ; ......
.................. . i2;i
00000002-TSG07
]"ll_tll't' IT-I. (qlllirlll|(,l, Xhlt_ ,_l SI,_ ,_('i<'lit':- Th,'
ORI(IINAL PAGE I_ c,t,:_i_.r - I,:iJl, h "il '*
I IF' Pt_ ill uUAI,ITY
00000002-TSG08
!i I I ! I I J
o*,,
,q
-:
..................."&_,_._,.**o.,o..,oo,'*'° ............_ ......... _;;:,;,_;*o.o:..,.,o .... ; . .,_,
iii-_ .,.,.._..._.,_..,._.,.,,,,o., .._. ....... , .... ,,..., .....................
_ • • , • , , •
..................... i! ;::_ o _.......+_,'._..... . .... . ,................ ._
;}......... -; .... ..............
1
• .,.. o,..oo _,^..... ;:.._ .........*;X._.
e •
I . .......... i1
1• ...................... o.o ...... ,.,**. .* ............. o..oo,_O
j '-r
. ::._
I
00000002-TSG09
• o
4
...................................................... ,.:'2 ' .._' .;"," '**. ...... , , ,, .... , , ,
_o. , o o ,......o .o_° ,,° ....oo, ...°. ,o° .o.. ........... ,...
+o •o ",. " . . .
.._..,.. ...... , ....... �4� �,.
._+L_.. )_'.a;,: $��(�.....
.° . . + °° °..
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: ,...........
ORIGINAL PAGP; Ib_)F P_)IIQI_AI,I'rY
00000002-TSGI0
* /._. : ".:-'_.:i:.".:. '._,:" ::'.' ,':"'- .,.;'_ :" ": . "' ',: ,),i, .:_i.':,.;' _ ,::- ."_
:tv-
4_4
, , , , ,, ....... , , - . .
; ..... .,..._o.-.,..o, ";2 k'C5"/,'5 ... , •
e_.o
• " :: ORIGINAL PAGE [b
" _,GEIb :- OF POOR QUALITY" A,I,ITY :::...a .....
0,,,:, ., 1
-,, l,mmcll I :_,.I, :d-2
° ..... _ _:_:....._ *'_0," ¢_".........................'*_ '...._........._ _:..............°...............:,......II....................._...._; .............. . 0 , ........ .., o II.......
00000002-TSG 11
, t I I ,
oRIGINAL PAGP_ laOF POOR _IUALrIT
LS-2 I T 7
_:.:.................. -_-ir-_.-'.-_._--;; ......._-_ ..... _ =='._ ...... ___=jl_ -..___ ........,T_,---_._.....,
00000002-TSG12
•{I ' ' ' ' + ' 'i,
%,
" Tahle 17-2, MSS ltu_,lmw,t' lli_to;'x - Lalld_al-_
(SIllllltllA lag OI |Ol' _phq'lell W+wl.
.,. (0 P,hjcl_ ; oi3 WhH(.')
A_ (,)'al;t, V;dn)'
' I l|ldll|_l _;t'll'..l)l' Idtltlt('h II;I _l'lqtV L_||II _lqlV I _jlh (ttllll' 'l'h|: 4,Ill',11' ( I|:1,_:'._. ?_tl_'( I ,_1,_ l,
-- ! !
I 13 Ill 39 I :I_ :I, _ '.,
" 2 I I II) 3D 3? ;I'_ II)
' I iI 46 13 12 II II - II ,,' 1, ,tfi 15 ,lli I,I I I I
+1
._ 7 '['7 Ii, I:, 15 I;, I,11 10 II lo 11
I) lM Ill Ill 1(; I;, _,
" '-'. I I) .)0 ,IM 1.,_ ,t7 hi , ,'-
1 I ,t_ 47 17 17 17 - 2
12 ,t7 It l t 13 12 - 11
,, 13 l'-' .I0 l(i 39 :P.I - 7
"'" 14 t ,l,l+ .tit l2 ,ll It -7i
15 t ,1.7 U) 17 t7 17 ,)%, 3 16 ,t7 45 . D; .I:5 15 • 1
, 17 [ 48 16 i -1:6 _ -l(i l(i -.1i 18 .16 lI ii .15 14 t/) -2
' -- ................. -t .............. + ................ !....................19 25 25 25 25 25 o
" 20 26 27 , 27 2U 2G o21 32 :12 32 :11 31 -3
• +t 22 29 30 30 "' ')'
_' I] 1 .,1 .,1 i)
'/ 23 32 33 33 32 32 ,)24 28 2_ ' 2_ 2S 2,', _)
. i j_,tile Lclll.,rt]l a250 :12.t9 _ 32.t8 :12-t(i ' 32•LG | _). o,;
J ............................ _1_................ --1............
_ 't ORIGINAL PAGF, t-OF..pOOR _t'.:'-,tF'
k).'-,. '. _ ,,,-a -- " . ....... o, + ................... .... .... -................... +...., ,,+++(,+, ...... • ,+,,..+::..... ,.......................+..............,,,:+:+,<,.++::,+:+:,.:.o......... _+_.......,(+_+: ,+, ,, ' ,,+.,.,. _ , +.,,,, .,.+,,.,
...... 00000002-T$G13
I i _ I ' I
ILVI°A CtHAA'_C'FI(_N _YSTI"M (l_t'_b
I,A NII_.VI'-2
|"
q
00000002-TSG] 4
' I I l , I 1 i I-i
@.
SECTION 18
DATA COLLECTION SUBSYSTEM (DCS)
, The _,C,S ff,uLsystem performed nominally during this rcport period, continuing message collcctio_ nt thenorlnal I',to.
Flhmrc 18-1 shows the ntm_ber o1' DCS lnossngcs received In each 1S-day cycle at OCC. The large number ofnlcs_affes shm_ for cycle 21 (February 1975) was due to an accidental mode selection for one of the ttTound
trans_,'dtters, DCS-6402. Active DCPts in the field remain about 90. Theperccnt,sge of good messages are: above9tI%.
Ther_are48usersinthedatabase. 257DCP's havebeenshippedwltl,255inthedatabase.
: T_tble !?-i shows telemetry values since launch. All are nominal.
Table 18-1. DCS Telemetry Values
........... 1
_ Orbits mi
" _.t_. No. Name 5 2462 5091 7641 10192 00840 12320 [ 12721
?. 16001 Receiver 1SigStrength 0)BM)* -123.34 -124.81 -122.02 -123.16 -123.06 -121.07 -124.62 I -12.L99!" iu009 Receiver I Temp k_)GC) 22.54 24.20 24.37 25. 12 24. s2 23.37 23.13 ] 23.12
o I'
16003 Rec-I l:NvrInputVolt CqDC) 2.35 2.36 2.36 2.37 2.37 2.36 2.35 ' 2.3.5
._.. 16004 Receiver 2 Slg Strength {DBM_ F F F F F F F F
I I16008 Receiver 2 Temp (DGC) F F F F F F F i° i F
. 16n_b [ Receiver 2 InputVolt (VDC) F F F F F F F [ F
i- ' *This value ' r, . _ . ._' "'_": It is notvalid during DCSmessagc reception
F ,_W.
,,'i
o'
%; I
o "p
. LS-2 1_- 1
v , -t
$.. ...... _ ., . ( _
00000003
?m "_ I
_ I I I I I I I I I I I o
(SONVSnOHI NI) a3^1:30":1_1S3OVSS3_
Is-2 LS-2
00000003-TSA03
!!
.
.L
t
_[ APPENDIX A
LANDSAT-2 ANOMALY LIST
.J
: !
b
00000003-TSA04
OaIG_-L pA6_ u_
i OFI_OR QUALr_
:oilt_
m
00000003-TSA05
• " _;.,.3 ;..3;-.'.3 _;:::1 '_;.3
in |
ORIGINAL PAGF, lbDI_,POOR QUAI,I1"Y l.s-'., A-l,/:'.
00000003-TSA06
II1I] ..
I]_
APPENDIX B
LANDSAT-2 SPACECRAFT ORBIT REFERENCE TABLES
_-- 4 .
,j
.i
b#
_n'"r.;, q n_ _ _n_ 4 _4 n
nf
O0000003-TSA07
LANDSAT-2
SPACECRAFT ORBIT REFERENCE 'I'ABLE_S
FROM JANUARY 1977 TIIROUGH JUNE 1978
ORBITS 9890 TIIROUGI! 1750.t
FI,IGIIT DAY 710 THROUGH 1255
00000003-TSA08
,,, ORIGINAL PAGE I_J ** ,t * ,_ t *.4_1+¢ --4 +t.+ ,* * , * + _¢ _i 1"11¢_, I_10, _ r ! I'_j _$
I.,). +_--' :" ' , .I" , 21" .._ .- .l I , , , : ' ' *" ' ' • . , _" " , 4" ' l+ _--_--|)_"POOR QUALI'T_
,,. _ p._ _r_ ...+ O.+re_ +. t.+% _1" -_t._, t'-) +,-.+¢. '"+ .1+I_+ ,_. f..t.. ,¢:%:,'_ lr _", 4_ r,+- c,
." .*_. ' ...... f*J f"_ .-1 ._ _, c"+, .:_lf_ , '1"1 4, P'.+.rl " % ,3.,,,| i_l ,
rl k, ."+ V r'.l _"¢ : ....... V ..............................
.f, r-. f'_ f- P.. f- r . f . P-. f .I _ =- ".. _ • _+ . +* P P * r- _ f . P I'-
_ '" : +. :" .. '.+; _ r ," o I,. I+" ;" d _ t .4_ t_ C-t:+ ;. d, _, J, [ ,: +'; ._ '4_ .:+ .1+ _ I" 1 t 4 ,;. ;; d ,1 ;; +_+ ,J +:+ t;, _J',
(_ _ ,el _, el "el .+" a" _1" -1" .J" 4r %J (_. f_. I_ f'_ *, (r, .'P, (*, _+ *+_ ,_1 ._r, t .11" _1"
4)• J" J :_ fl t • _ $ _ t ", :
.+.1 _ C.l OJ CJ _x+ ° : ,t, . .! . + ( ,
..; ......... . .,2 ............, . ++++
•JL _ _ ' ' " ", _+ • .. ., .. o I _| , . + , ',+ + *. , *.
P ', _ *- *+ • _I, r _ + * "_*+ + : " :- _ . •+ + . • : • I : .
I r_ ' , ". • " + "t -' * t .+ p +
.... .: +" •................... ; ....... "+. . u+-_ - +.* _+ _-* _ _ e-+ ++ +_ .+ +¢ +.+ v, + .+
_ _ .+ + +' . .+ : • ....... r-. . , , + , + ..... ;_._ , .- _j * ** _ : ++ + _p .* j+ ? +" . , + * r + * -* t # ' t * _ ,* P
• _. ..J .++.-+ .+ .+ .* .. -- o+ .- Pt ....., , , ..* ++ .- • + ...,..++.-+++ ,i .. ++
r, f . -. . . , r + "- . " . t ; ". "" +-u-_ , _ . +'u " " _ _ _ .... _.* . _ " : ": _ .
g ; "42 _ " " _, .... 2 ...............•" 3' \" _ + +•* _ f " _ , * 4 " "_ t ,r, /" *_ t* +" -_ . _ ' * _r+
k
_ ,,J _ "_, .4 _I",+" ".+ 7) "-3 .J. t'+ +,.+.',.% ,_ _. .+ (1 .7 r) %. .+ _ t + .. . ."+ '_ _,.1
r% 4_ +%+ I
-+" +J._** _ZJ +'4 + 4 ++ m m *--e t_ C; +,1 ++| , +I• ,_ ." $ I I I l t l I I I e I l I I I I I I I I I I t I I l l
_+_ I" _ _. .+ p n . ,£ o+. p .. ,., :+. _ ,.% _. ++ ++, _ _ _. _ +. 1 ', ,, . r O.• _J. I) "+. "_ J +* _ ++ ,," P'_ ( I." • • ,% ' +:} 4", t, _ ; _ "+.+r _ +,. _P ' _ '.,.7"*
+ - Jl+ '; ++: _ _+ + • -, ++ t z ._ ( "_ *¢ _ t p +_ t t., + _- *' +" .,+• . + +_ , ; +_ .+ *-_
+, I_ + _) ) _ + ) _ .3 ) + _) l ) ) • -) _ • ._ l + ) . + .I J • . ;_. .J -.-4 ,_,.-,,i.wl * t -4 .-4 ,*-4 ¢ 4 ..-4 -4 + 4 -4 -4 +4 .-4 +4 *l , ¢ .s * I *4 * I .¢ . I t t + +
_l +; l l l t l + l l e e I I l I l I I l l I t I l I t l l t_, J E x_ _ ) • • + + + * : +" _ _ _+ ,4 ,1 +'+ '_ "- 4 +_ -x *1 _'_ . * + "_ T ' _J % ._ + " + .; " * , _- I. I +4 _ * - • _ + , ,' * f + +', *
I _* _+ ++ " * ) + ** +* "* +* " P - ' "" + ) * .... • ' : *
• 4+4 *4 ** +1 .¢ .'I *4 .+.s *+ ++ *¢ ++ .+ ++ ++ * t -4 .+., + ¢-* +4 .+ .++
k*_:_+' +" • ++ "+ r p " _) *" 0 %1 ) •* n ,', # +, +(_ P" + _ • - * "t "P, • + 4_ %+ P
? "- * t _ P J+ 2 P ' +" , + • ! " "* . _ • _, + _ _ J _ ++, ."" "+:. ','.*-+-f".:-f_-, f.I- P'--,+" r-P'- , ..... f-'. "-f'-,-P" ._-t'_P...'. P_ .'- p+
I
!
a.+ t I *'I 'l '_ "' +1 ,_) ,,_* ,_I 4_ .IP t J" _P f_ t t t t I ._ ,+ + ,, -,' *+ .l: • , ++ + ++_T) k.
I
" _ ----I ....... ; ........................l
L. I
'_, i "3 e', ' II i
I_-2 -- ' B-3 i...
.......:'...............! , t I , n ::
O0000003-TSA10
,'_I(I_;I'/A!', PAP,E I_:_,I" _',. If( ql A ,ITY
I _ , l I + l t I" _ I # I t I+ I 4 4 ++ I I ++ : t / '+; "
ij +
I
., ._ _P I:'I I-_ F" I+ _' + . _ , I t + • t
;+ I
++st ¢II _' I II '+ f , .4 ( , ¢_ I r i _, I+ ' _ , I i r _ li - I-I - (;I l+t_
+I _I -I ,-_I tl " p _ _ _ + ' + + | - I ¢ _ I + I t I ¢ i ' i+ i fl . _ • 4 _i I_ I ¢ I I . i I I , I , I i • I I , i , , , . . i , i . + I 11
,% :, p+ ,+ ; ,. r , * ,,+ • + ,+ , _ + + • ' ' I,
,+ m • • . m *_ +_ ++ . .. • +I ++ .i m m _ ,+ , ++ m - • - +i il m +++
p t I + ; , , ,I , I + , .+ , ' it , ,r l I + i l I • + + ¢ t l t : ,,
i+ .t .+ ++ • , . . m
,I. ,|I +_, ,: 'v _* "_ • I .I -I +l _I+ l.'l*l ,$" I. _ I+/I U! ++ ' ,.* - ';' _. +' I I I I
I+ • , + • _ I+ , +++ . , + +.
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