getting ready for picard helioseismology program – decembre 2008 - nice the picard payload data...
TRANSCRIPT
Getting Ready for PICARD Helioseismology Program – Decembre 2008 - NICE
THE PICARD PAYLOAD DATA CENTER
Grégory PRADELS
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PAYLOAD PROGRAMMING PLAN
How is elaborated the measurement plan ?
KERGUELEN
KOUROU
HARTEBEESHOEK
KIRUNA
TOULOUSE
BRUSSELS
Satellite control center
Payload data center
PICARDSATELITE
Data users
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WHAT IS A PAYLOAD DATA CENTER ?
A PROCESSING CENTER TO Create the measurements plan of all the instruments, Process all the raw telemetry, Create the mission products (L0 L2A), Control the instrumental parameters,
A DATA BANK TO Collect the data from various location (CNES, CNRS, PSPT, etc), Disseminate the data to the users (automatic or on demand service), Archive the data (short and long term archive),
AN OPERATIONNAL CENTER TO Verify the measurement plan Take care of the mission data production, Communicate about the mission operations.
So it’s the interface between data users and the instruments.
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THE PICARD PAYLOAD
SODISM Cassegrain telescope,
SOVAP Differential radiometer + bolometric
sensor,
PREMOS 2 absolute radiometers + 3 photometers,
ONBOARD PROCESSING Downlink limited to 325 Mbytes/s Necessity to process the data
SODISM
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(a) (b) (c)
a) full image (2048x2048)b) solar limb (4) with markers (1-3)c) macropixels (8x8)d) flat-field (with internal lens)e) full dark current imagef) dark current limbg) 2 windowed imagesh) small dark current image
a) b)
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d) e) f)
g) h)
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SOLAR OBSERVATIONS SEQUENCE
orbit = 100 minutesday = 14 orbits
years = 365,25 daysmission = 3 years
minute orbit day year missionHelio macropixels (535 nm) 1Helio limb (535 nm) 0,5
minute orbit day year missionHelio macropixels (535 nm) 1 100 1 440 525 960 1 577 880Helio limb (535 nm) 0,5 50 720 262 980 788 940
Ascending node local time : 6h00Altitude : 725 km Inclination : 98.29° Eccentricity : 1.04 x 10-3
Helio sequence
minute orbit day year missionWide limbs (215, 393, 535, 607, 782 nm) 10 144 52 596 157 788Full images (215, 393, 535, 607, 782 nm) 5 72 26 298 78 894Dark current limb 4 58 21 038 63 115Dark current full image 1 365 1 096Flatfield (215, 535, 607, 782 nm) 1 365 1 096
Total 301 989
Non helio measurements
14,4
85,86%Rate
Helio macropixels (535 nm) 77,47%Helio limb (535 nm) 93,22%
Helio measurements rate
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Ascending node local time : 6h00Altitude : 725 km Inclination (i) : 98.29° Eccentricity : 1.04 x 10-3
DISTURBING PERIODS
ECLIPSES 0 to 25 minutes per orbit October to February
ATMOSPHERIC DISTURBANCES 0 to 8 minutes per orbit 1 week per year (october)
SCALE FACTOR DETERMINATION Stellar pointing 66 minutes Once per 3 months
OPTICAL CALIBRATION 12 rotations of 30 deg 936 to 1200 minutes Once a month
+
ND
NA
a
i
XsYs
Zs
N
S
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BILAN
Mean helio sequence duration (out of the eclipse period):- sequence of one macropixels per min ~ 20 min - sequence of one limb per 2 min ~ 1 month
minute orbit day year missionEclipse 22 032 66 096Atmospheric disturbances 806 2 419Scale factor calibration 264 792Optical calibration 12 552 37 656
Total 106 963
Number of minutes used by other activities
RateHelio macropixels (535 nm) 80,86%Helio limb (535 nm) 100,00%
Helio measurements rate with respect to the by default helio sequence
By default helio sequence:One helio macropixel per minuteOne helio limb per 2 minutes
RateHelio macropixels (535 nm) 77,47%Helio limb (535 nm) 93,22%
78,93%
Total helio measurements rate (including other activities) with respect to the by default helio sequence
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TELECOMMANDS & TELEMETRY
TELECOMMANDS MANAGEMENT Automatic process, Triggered twice a week at the Payload Data Centre, Uses orbital prediction and scientific requirements, Produce the measurement plan for the coming 10 days, Checked by an operator, Send by the Satellite Control Centre.
TELEMETRY MANAGEMENT Automatically collected on the CNES server (secured FTP server), Collected continuously (every day) Telemetries are processed at Day+1 to create Level 0 data Level 0 data are processed at Day+2 / Day+3 to create Level 1-2 data Disseminate on payload data centre server (secured FTP server)
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MISSION SCIENTIFIC PRODUCTS
SODISM Level 0, 1, 2A + Quicklook L0, L1 Fits format L0/L1/L2A ~ 4 400 files/day Volume ~ 2 000 Mbyte/day
SOVAP Level 0, 1, 2A + Quicklook L1 ASCII and fits format L0/L1/L2A : 5 files/day
PREMOS Level 0, 1, 2A ASCII format L0/L1/L2A : 11 files/day
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ON GROUND SCIENTIFIC PRODUCTS
OCA’s images Limbs at 393, 535, 607, 782 nm Full image at 393 nm Number function of the observation possibility
LESIA’s images (393 nm) 3 full images at 393.3, 393.4 nm
PSPT’s images 5 full images at 409.4, 607.1, 393.4 nm
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OTHER PRODUCTS
ORBITAL DATA Satellite ephemerids
– With respect to the Sun and the Earth– Inertial reference frame (J2000)
Satellite attitude– Quaternion or Euler angles
Satellite orbital events
Sun ephemerids
Characteristics : ASCII format, 1 file/day
HOUSEKEEPING Instrument housekeeping data Satellite housekeeping data
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HOW TO COLLECT THE PICARD DATA
AUTOMATIC DEPOSIT New data are automatically recorded on the FTP server, FTP server are available for authorised groups, Security = login/pwd (no data coding), Data are compressed (zip files) Old data will be erased (period to be defined)
ON DEMANDE SERVICE A search engine will be available on the Payload Data Centre web site, Criteria = date, data level, instrument, etc From the results page you will be able to :
– Download the files,– Show the images/data (ASCII file, fits header),
Possibility to draw a graph : y=f(x) Services available for authorised people
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WANT TO KNOW MORE ?
PAPER The PICARD Payload Data Centre, G. Pradels et al.SPACEOPS 2008, Heildelberg, Germany
Ask by email : [email protected]
WEB SITES http://smsc.cnes.fr/PICARD/Fr/GP_mission.htm http://www.busoc.be/fr/operationnel/picard.htm
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ECLIPS DURATION vs ALTITUDE
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ATMOSPHERIC DISTRUBANCES