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| | | | | | | | | Proba liftoff onboard PSLV | |
Facts and figures
| Mission | | | Launch date | 22 October 2001 | | Launch site | Sriharikota, India | | Launcher | Antrix/ISRO PSLV-C3 | | Orbit | LEO Sun-synchronous | | Orbital parameters | 681x561 km | | Orbital plane inclination | 97.9 degrees | | Orbital period | 96.97 minutes | | Mission duration | One year (planned) | | Number of instruments | Eight | | Number of technological payloads | Six | | Mission operations and ground station | ESA/REDU dedicated 2.4 m dish, average of 4 contacts of 10 m/day, automated evening & weekend passes |
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| | Proba PFM during vibration tests | |
| Spacecraft | | | Spacecraft mass | 94 kg | | Instrument mass | 25 kg | | Technological payload mass | 30 kg | | Shape | 60x60x80 cm box shaped aluminium honeycomb structure |
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Proba-1 platform features
Computing system (highest performance computing system yet flown on an ESA spacecraft)
- ERC-32 (SPARC V7) processor, >80 krad, 10 MIPS, 2 MFLOPS
- TCS 21 020 digital signal processor, >100 krad, 15 MIPS, 45 MFLOPS
- 12 other processors in subsystems/payload
- off-the-shelf operating system (Vx Works)
- full automatic code generation of all attitude control and navigation software (~50 000 lines of code)
3-axis stabilisation (Earth pointing or inertial) by four miniaturised reaction wheels
- absolute pointing accuracy: 150 arcsec
- relative pointing stability: 10 arcsec over 10 s
2-headed star tracker providing arcsec level pointing knowledge
| | | Sriharikota, India - CHRIS image - 8 February 2002 |
GPS sensor providing 20 m position and fly-by knowledge
Spacecraft agility (along- and across-track), enabling multiple payload imaging (typically 5) of the same target in the same pass
Autonomous navigation via GPS and orbit propagation (no propulsion)
GaAs solar cells on five structure faces
- 120 W peak
- 17 W in safe mode
28 Vdc regulated power bus
| | | Mauna Kea volcano, Hawaii - CHRIS image - 15 April 2002 |
9 Ah Li-Ion battery
Passive thermal-control system
1 Mbit/s S-band downlink
4 kbit/s uplink
1.2 Gbit data storage
Last update: 27 May 2009 | |
| | In depth Third Party Missions: Proba-1Spacecraft EngineeringRelated links Indian Space Research OrganisationPolar Satellite Launch Vehicle
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