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FLIGHT RESULTS FROM PRISMA FORMATION FLYING AND RENDEZVOUS DEMONSTRATION MISSION

FLIGHT RESULTS FROM PRISMA FORMATION FLYING AND RENDEZVOUS DEMONSTRATION MISSION. Staffan Persson Swedish Space Corporation Per Bodin Swedish Space Corporation. The mission. DEMO OF FORMATION FLYING AND RENDEZVOUS TECHNOLOGY GPS RF sensor Vision Based Sensor

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FLIGHT RESULTS FROM PRISMA FORMATION FLYING AND RENDEZVOUS DEMONSTRATION MISSION

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  1. FLIGHT RESULTS FROM PRISMA FORMATION FLYING AND RENDEZVOUS DEMONSTRATION MISSION Staffan Persson Swedish Space Corporation Per Bodin Swedish Space Corporation

  2. The mission • DEMO OF FORMATION FLYING AND RENDEZVOUS TECHNOLOGY • GPS • RF sensor • Vision Based Sensor • Flight demonstration of motor tech • HPGP propulsion (better than Hydrazine) • Micropropulsion • 2 satellites in LEO (725 km) • Mango (150 kg 6 DOF capability) • Tango (45 kg ACS only) • Mission control from SSC Stockholm Mango Tango

  3. The project prime partners Prime, Mission, system design GNC and OBSW AIV and Operations GNC experiments GPS system and nav S/W POD GNC experiments FFRF nav instrument GNC experiments Vision Based Sensor HPGP motor system MEMS microthruster system

  4. Launch campaign, Yasny, May-2010 • Launch campaign during 20 days • Check-out of 2 S/C • Mating Tango to Mango • Filling/press. of three prop systems • Mating to Dnepr system HPGP fuelling Tango mating Mating to Dnepr SHM

  5. Launch on June 15 • Dnepr launch from Yasny • Dual launch with CNES S/C Picard • Separation over Africas horn • Signal acquisition from Kiruna after 70 minutes • All systems OK Courtecy Kosmotras Courtecy Kosmotras

  6. Commissioning GPS antennas • Systems Check-out • Nominal and Redundant systems, both satellites • GPS relative navigation check • GPS antenna offset perfectly known • Comparison with Precise Obit Determination (ground based)

  7. Tango Separationflight data - view on Mango Careful planningAttitude so that alongtrack motion 200 m/orbitdV after 3 orbits to stop alongtrack diftSafe orbit guidance

  8. Tango Separationflight data - view on Tango Tango ACS by magnetorquers only!! Tango sun acquisition after <10 minutes

  9. Separation, August 11 • SSC separation system • Alongtrack sep velocity 2 cm/s • Compensation dV after 3 orbits • Tango reached sunpointing after only single minutes (predicted 50) • Excellent behaviour of Tango ACS

  10. GPS calibration • Characterization of GPS nav system • Robustness to • Data gaps • dV manoeuvers • Tumbling • Antenna switches • Result after tuning Centimeter accuracy

  11. HPGP first test set • Characterization of HPGP – ”High Performance Green Propulsion” • 2000 thruster pulses fired with different pulse lengths and duty cyces • Preliminary results: • Repeatable and predictable performance • Performance as predicted BETTER THAN HYDRAZINE

  12. FFRF initial check-out • RF-based relative navigation instrument • Very promising results up to 10 km range: • range errror ~ 10 cm • LOS error ~ 1.5º • FFRF open and closed loop FF experiments will follow

  13. Autonomous Formation Flying • AFF in closed loop • Resize, re-orient shift relative orbit • Fully autonomous manoeuver planning and execution • Fuel optimized AFF 9 days complete motion of Mango relative Tango in alongtrack Closest approach 18 meter !!

  14. Images from DVS camera - Techno Systems

  15. Upcoming experiments – Autonomous RVD • Target search/find • Orbit alignment • Autonomous RVD • 100 km to 10 m VBS photos overlayed during one orbit

  16. Upcoming experiments – Proximity Ops • Forced motion between hold points • GPS or VBS Tango LED pattern

  17. PRISMA – the In-Orbit Test Bench Basic systems have proved to be robust Less propellant consumed than expected dV WILL REMAIN AFTER BASIC MISSION NEW EXPERIMENTS CAN BE DESIGNED • Utilize existing S/W – tailor your own rendezvous • Upload new guidance, utilize onboard nav and control • Upload complete new GNC S/W

  18. PRISMA – the In-Orbit Test Bench for FF and RVD INVITATION ! TAILOR YOU OWN USER EXPERIMENTS ON PRISMA Follow the mission on www.prismasatellites.se

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