sansa space operations: history, services and...
TRANSCRIPT
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SANSA Space Operations: History, Services and applications of satellite technologyE Avenant
24 February 2016
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History of Hartebeeshoek(HBK) Tracking station
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Sputnik 1- 1957
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The Satellite Applications Centre had its origin in 1958, when the National TelecommunicationsResearch Laboratory (TRL) of the CSIR agreed to operate and maintain a Minitrack station on behalfof the American Naval Research Laboratory (NRL) in South Africa. South Africa was strategicallysituated relative to the launch facilities in Cape Canaveral, and would give early confirmation that asatellite launched from Cape Canaveral was indeed in orbit.
1958: Minitrack establish at Esselen park
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The Minitrack system was installed with the help of engineers from the Naval Research Laboratoriesand became operational in January 1958. It is history that the Soviet Union launched SPUTNIK 1 inOctober 1957. The Joburg Minitrack Station - as it was known - tracked its first Project Vanguardsatellite, code named 1958 Beta, in February 1958. Although the emphasis was on determining theposition of the first satellites accurately, this soon became of secondary importance as moresophisticated instruments were placed in orbit to measure a host of physical and geo-physicalphenomena. To receive telemetry data from instrumented satellites soon became the primaryfunction of the Minitrack Network - including the "Joburg Minitrack Station".
1958: Project Vanguerd Satellite tracked by NITR
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In 1960 operations were transferred from Esselen Park to Hartebeesthoek, and the Joburg SatelliteTracking and Data Acquisition Network Station (JOBURG STADAN) was born. This became one of thebusiest network stations in the GSFC satellite tracking telemetry and command (TT&C) network. Itwas eventually equipped with three receiving links at 136 Mhz and later S band and two powerfulVHF transmitting systems.
1960: Minitrack moved to Hartebeeshoek
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To meet these new needs, a number of fundamental changes were made to the Minitrack network.
• Site changes, closures and additions• Adding larger 12 meter and 26 meter dishes at some sites• Adding the Goddard Range and Range Rate tracking equipment (GRARR)• Adding new automatic tracking telemetry and command antennas (SATAN)• Larger and more automated ground communication links between stations
The resulting network was called the Spacecraft Tracking and Data Acquisition Network, or STADAN.
STADAN
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1960 the start of a Minitrack station moving towards a STADAN
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SATAN
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During the 15 year as part of the GSFC network “JOBURG STADAN” received more than 8 millionminutes of data, tracked 400 000 satellite passes and supported over 250 NASA launches.
1961-1975 Supported NASA missions
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In 1963 a 12m hydraulic X/Y mounted parabolic antenna was installed with 400 MHz and 136 MHzreception and mono-pulse tracking capabilities. Shortly afterwards “S” band reception and trackingcapabilities were added. Two 5 kW 148 MHz transmitters were added each having its own antenna.At the same time, two hydraulically driven X/Y mounted arrays were installed. During this time a newbuilding was erected and all telemetry equipment and activities transferred. A sophisticated tripleredundant timing system was installed and later the first PCM data handling equipment, and digitalcommand encoder.
1963: 12M Antenna established
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1963 First parabolic antenna UHF/VHF feed
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NASA ceased operations in South Africa at the end of October 1975. The CSIR then used theremaining equipment and a core group of personnel to establish the Satellite Remote Sensing Centre(SRSC) in 1976 for reception of geo-information from satellites.
1975: NASA terminates activities.
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• 1961 - 1975: Support of NASA missions• 1975: NASA terminates activities• 1976 CSIR takes control• South Africa move towards Earth Observation data• Meteosat• Landsat MSS• Noaa data• Spot 2• CNES Partnership
History continues
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Meteosat imagery 1977
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Landsat MSS (Multispectral Scanner) The Multispectral Scanner (MSS) sensor acquired imagery of the earth from July 1972 to January 1999 on board Landsats 1 through 5.
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SINCE 1984
National Oceanic and Atmospheric Administration (NOAA)
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1983: Part of CNES network S Band
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• New building • New LSX antenna• South Africa starts to see the value in remote sensing• More launch supports for the French Ariane 4 program
1988 SRSC Satellite Remote Sensing Centre
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CSIR and Boeing venture into KU/DBS and Ka band Space Operations
1998- 2002 leap into the Space Operations
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• 1998: Ku/DBS band capability• 1999: SA first satellite• 2002: Ka-band capability ( first ever Toss)• 2003: MODIS and NOAA upgrade• 2004: 5.4m X band antenna• 2006: SPOT-5 direct reception• 2010: 7.3m X band• 2010: SumbandilaSat SA second satellite• 2010: Established Mission control for Sumbandilasat• 2010 Established Orbcomm facility• 2011 Established Ksat facility• 2012 New Skytrax facility • 2012 Established new C Band facility for Intelsat• 2013 Established a new IOT facility for SANSA
Space Operations History
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Demand for Earth Observation Data requires more antenna 2004- 2007
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Space Operations gets more antennas
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Service offerings at Hartebeeshoek
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SANSA has four directorates:
• SANSA Space Science (Hermanus)• SANSA Space Operations (Hartebeesthoek)• SANSA Earth Observation (Pretoria)• SANSA Space Engineering (Pretoria)
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National Geo-space Laboratory & Research Platform
• Wide geographic instrument network• Wide instrument variety• Extensive data stock & distribution network• Continuous monitoring of space from the ground
Research, Development & Applications
• Space Environment Research• Model development and simulations• Space weather • GIC research• Antarctic space physics• Extensive collaboration in Africa and overseas• Magnetic technology development
Product & Service Offerings
• Magnetic Technology Support• Compass calibrations and ground navigation support• Space weather provision• Magnetic Field modelling
Space Science Programme
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Sensor Portfolio Management• Archive dating back to 1972 • Spot 4,5 & 6; Landsat 5,7 & 8; Modis• Distributor Portfolio: Digital Globe; GeoEye; Terrsar X
SAR; Tandem X SAR• Direct reception: Spot 5,6 & 7; Landsat 7 & 8; Modis,
CBERS-4 (2015)Data management• Support the SAEOS• Data acquisition, processing & archiving• Data distribution to public entities (multi-user
licensing)• Support the GEO, GEOSS, CEOS & AfricaGeospatial informatics• Land-Cover Applications: vegetation; agriculture;
water; soil; • Land-Use Applications: settlements; urban mapping;
planning; performance monitoring; mining• Health, Safety & Security: Disaster management,
national security
Earth Observation Programme
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ARMC • South Africa• Nigeria• Kenya• Algeria
RSA: ZA-EOSAT-1• Optical• Operational• Addressing subsection of user requirement
Previous satellites:• Sunsat• Sumbandilasat• TsepisoSat
Space Program Division
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SANSA Space Operations
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© CSIR 2006 www.csir.co.za
Ground station background • 52 years in the business, reputation as top quality TT&C service
provider• Over 422 supported since 1984• Frequency Bands: L, S, Ext C, C, X, Ku, DBS and Ka,• 7 full motion TT&C antennas, 4 Remote Sensing systems• 24 x 7 operations• Dedicated Ku-band IOT antenna • Dedicated IOT test facility• Earth station verification
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Telemetry, Tracking & Command (TT&C) services
• Launch support• Transfer-orbit support• In-orbit testing• Lifecycle support• Emergency support• Carrier monitoring• Antenna verification• Hosted infrastructure• Mission control• Remote sensing TM reception
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Value chain: TOSS, IOT & hosting services
Launch vehicle support
LEOP and TOSS
SupportIOT Support Routine
Operations Hosting End of life De-orbiting
• Lift off to separation
• Position the satellite safely in the correct orbit
• Critical operation
• LEOP: from satellite separating (from the launch vehicle) until satellite is safely positioned in its nominal orbit
• Critical operation
• IOT campaign measures the accuracy and stability of the satellite
• Assessing the quality of the signals
• Results gathered will set a benchmark throughout the satellites’ operational life
• Monitoring TM (currents, voltages, temperatures, status data, etc.) measured by on-board instruments
• Daily supports• Normal
operations• 24x7
• Hosting of space related infrastructure
• Providing maintenance to third party assist
• On-call support for emergency maintenance
• Manoeuvre satellite from normal position to de-orbit phase
• The satellite needs to burn out or send to graveyard orbit
• Critical operation
SANSA Space Operations – Vision, Mission & Strategy
SANSA as a whole – Vision , Mission & Strategy
Make sure each and every Value Add is accounted for
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TT&C Support 2014
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Telemetry Tracking and Command
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SANSA Space Operations:• Hosts ground station for TT&C and data download• Responsible for Mission Control• Establishing an S/X system dedicated to (ZA-EOSAT-1)• Drives Space-Ground interface in definition phase• Suited to download data from other satellites in the regional constellation
Regional offerings: ARMC
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Satellite Navigation
EU – SA Space DialogueAFSAGA ESESA EGSA
2011
SATSA
2007 2008 2012 20132009 2010 2014 2015
• January 2009 Initial EU-SA Space Dialogue South Africa• February 2010 – Nov 2011 ESESA • July 2010 Joint Program Office, SANSA Establishment• February 2012 – September 2013 SATSA • Joint Statement signed by EC VP Tajani and RSA Minister Naledi Pandor 21-3-2012• July 2012 EU-SA Space Dialogue meeting: Task force established• January 2013 Task Force Document• February 2013 GLUG workshop• September 2013 SATSA Final Dissemination event• January 2014 Conclusion of GNSS contribution to EU-SA Dialogue• April 2015: SBAS Africa
SAFIR
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Possible SBAS-Africa EvolutionPhase Description Schedule
0 12-month UKSA-funded SBAS-Africa project Apr 2015 – Mar 2016
1 24-month extension with live signal-in-space (SIS) Apr 2016 – Mar 2018
2 SBAS L1-only OS in RSA Apr 2018 – Mar 2020/2022
3 SBAS L1/L5 OS in RSA + SADC Apr 2020 – Mar 2025
4 potential SBAS L1/L5 OS and SoL service in SADC Apr 2025 - onwards
2015 2016 2017 2018 2019 2020
ph0: SBAS AFRICA
ph1: 24-mth EXT
ph2: RSA SBAS OS
2021 2022-onwards
ph3: SADC SBAS OS
Ph1 RSA extension decision
Ph2 RSA OS decision
Ph3 SADC OS decision
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Infrastructure
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Geographic area
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• Be ready to support requests from public and private sectorto use expertise to address issues pertaining to satellitesystems
• Examples:– Sacommsat study– Space debris re-entry
Regional offerings: Ad-hoc
IMPACT
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• Re-purpose SumbandilaSat ground infrastructure for tracking Cube-Sats• Initial mission: CPUT CubeSat-1• Become part of international network• Provide training internally to Operations Technician interns and externally to tertiary
students
Regional offerings: Cube-Sats
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• Internal SANSA Earth Observation SANSA Space Science Project office
• National: Navigation Communication DOD DST DTI DOT
SA CAA PRASA SAMSA
ATNS Denel
Internal & National Stakeholders
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• Internship Programme Operations Technicians
• Science Advancement Man in the making CellC Take a Girl Child to Work
• Science Awareness Science festivals and exhibitions School/Learner Programmes
• Guest Speaker (Gladys Magagula) Women in Engineering Conference Women in STEM Convention
• Community awareness School donations
Outreach initiatives
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Application of Satellite technology
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• NOISE vs SIGNAL vs INTERFERENCE• Antenna/Telescope• Wavelength/Frequency• Orbits and Applications• System block diagram• Modes and states• LEOP, IOT and ESVA activties
Applications of satellite technology
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Application
Orbit CommunicationEarth Observation Navigation
Search and Rescue Science Astronomy
LEO(100 -1000km)MEO (1000-30000km)GEO(36000km)
L1-L5Other(Earth or Sun orbiting)
Orbits and Applications
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Communication Earth Observation Navigation/Positioning/Timing Search and Rescue Science Astronomy
LEO Orbocmm Spot DORIS
COSPAR SARSAT: NOAA,METOP GRACE HUBBLE
Iridium Landsat Satellite ADS-B SORCENOAA Satellite AIS OCO Fermi Gamma-ray Space Telescope
NROLL Swift Gamma Ray Burst ExplorerSumbandilasat AGILEZA EOSAT 1 AstrosatARMC NuSTARMETOP
MEO Polar GPS GALILEOGLONASSBEIDOUGalileoGAGANQZSS
GEO Intelsat GOES WAAS GOESEutelsat INSAT EGNOS INSATSES Astra MSG GAGAN MSGData comms QZSSTelephonyDTHVSAT GSM Backhaul
L1-L5 DSCVR SOHO Herschel Space ObservatorySTEREO (L4,L5) Planck
Other THEMIS SpektrXMM-NewtonSpitzer Space Telescope
Orbits and Applications: Examples
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Front –End detail
TLT
TWTA
TWTA
Mode Launcher
E1
LNA 4
LNA 3
LNA 5
LNA 1
LNA 2
E1E1
TransmitRejectFilter
TransmitRejectFilter
CombinerNetwork
PowerSplitter
TurnstileOMT
Power Splitter
20-30 Ghz Diplexer
20-30 Ghz Diplexer
Coupler
CouplerCoupler
Coupler
Coupler
CouplerCoupler
Coupler
50dB
50dB
10dB
10dB
40dB
40dB
40dB
40dB
LHCP/H
RHCP/V
trackingcoupler
90 deg Polarizer
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Sub-systems Major ComponentsAntenna unit Main Reflector
Sub-ReflectorMechanical structureFeed housing
Transmitter TWTA unitsReceiver Telemetry Downconverter
Tracking DownconverterRF Feed Polarisation selection
Redundancy switchingFeed hornLNAs
GPS Unit GPS ReceiversSwitch-over unitDistribution Amplifier
Monitoring and Control Local unitEquipment Interface unitFibre Optic linkRemote unit
Antenna Control Antenna Control UnitAntenna drive cabinetLocal control unitReference OscillatorDual speed resolversDC Motors (permanent magnet)
Electrical Furnishings Antenna lighting protectionEquipment groundingCablingAir-conditionerWaveguide pressuriser
Acquisition Aid ParabolaLNB
Main components and modesOFF
START-UP
STANDBY
ACQUISITION
TRACK
Step-track Monopulse (Autotrack)
Memory Track Program Track
Command Position Manual Rate Scan
STOW
Az/El track Intelsat NORAD (4 models)
Augmented Steptrack
Star Track
Smart Track Augmented Autotrack
Augmented Scan
Polynomial TrackGeo Scan
Autophase
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Antenna sighting considerations
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• Pre-launch dataflows in order to verify compatibility of groundstation to mission
• Tracking of Spacecraft providing time stamped antenna pointing information to satellite operator
• Ranging to spacecraft: Providing time stamped distance information from the groundstation to the spacecraft
• Commanding: Relaying commands to spacecraft from ground network, see diagram
• Telemetry: Receiving spacecraft telemetry from the spacecraft for relay to the ground network.
LEOP Activities
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Transfer orbit support
ELSCC: 7th MISSION
W2A-LEOP Mission_YT_V1.0_13/03/2009restrictedrestricted to to eutelsateutelsat internalinternal use use onlyonly
W2A LEOP MISSION MAIN EVENTS
Geo-Transfer OrbitAltitude Perigee 5 010 km i = 20.7°
Period = 11.9 h
intermediate Orbit 1Perigee altitude 14 200 km i = 8.3°
Period = 15.3 h
intermediate Orbit 2Perigee altitude 31 500 km i = 0.9°
Period = 22.1 h
W2A Drift near to Geostationary orbit
until arrival at theIOT longitude 1.7° E
Drift & fine StationAcquisition Manoeuvres
BAPTA switch-on
Final Earth Acquisition
Wheel Run-up
Solar ArraysTotal Deployment
Sun Pointing
Apogee Boost Attitude
GyroCalibration
Solar Array Partial
Deployment (To+2h30)
1st Sun Acquisition
CPS Venting
Proton-M/ Breeze-M LIFT-OFF at 16:27 UT (To)
Monday 30 March 2009 (DAY 0)W2A Separation at To+ 9 h 10mn
LDR & West Reflectors
Deployment
SUN
1st Apogee Engine Firing, at Apogee 22nd Apogee Engine Firing, at Apogee 43rd Apogee Engine Firing, at Apogee 6
W2A mass = 5 922 kg at launch
(DAY 1)
(DAY 6)
(DAY 8 - 9)
(DAY 6)
W2A
(DAY 2)
POSITIONING SEQUENCE: AS PLANNED
AEF 3
AEF 2
AEF 1
1st Telemetry receptionat separation time of W2A
(To+ 9h 10 mn)via Fucino (I) and Pretoria (S.A.)
(DAY 3)
(DAY 5)
(DAY 9)
(DAY 6)
(DAY 6)
Eclipse zone
698 m/s 145 mn
620 m/s 104 mn
96 m/s 14 mn
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• Test all subsystems on the spacecraft• Verify transponder characteristics• Verify satellite power handling capabilities• Map antenna footprints from the spacecraft
IOT Activities
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ESVAAntenna
Verification
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South African National Space Agency (SANSA)
SANSA (@SANSA7)
South African National Space Agency (SASpaceAgency)
www.sansa.org.za