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Flygteknik, Oktober -10 FLIGHT RESULTS FROM PRISMA FORMATION FLYING AND RENDEZVOUS DEMONSTRATION MISSION Staffan Persson Swedish Space Corporation Per Bodin Swedish Space Corporation
Flygteknik, Oktober -10
FLIGHT RESULTS FROM PRISMA FORMATION FLYING AND
RENDEZVOUS DEMONSTRATION MISSION
Staffan Persson Swedish Space Corporation
Per Bodin Swedish Space Corporation
IAC 2010, Prague 27 Sep
The missionDEMO 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
IAC 2010, Prague 27 Sep
The project prime partnersPrime,
Mission, system design
GNC and OBSW
AIV and Operations
GPS system and nav S/W
POD
FFRF nav instrument
Vision Based Sensor
HPGP motor system
MEMS microthruster system
GNC experiments
GNC experiments
GNC experiments
IAC 2010, Prague 27 Sep
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
Tango matingMating to Dnepr SHM
HPGP fuelling
IAC 2010, Prague 27 Sep
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 KosmotrasCourtecy Kosmotras
IAC 2010, Prague 27 Sep
Commissioning
• 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)
GPS antennas
IAC 2010, Prague 27 Sep
Tango Separationflight data - view on Mango
Careful planning
Attitude so that alongtrack motion 200 m/orbit
dV after 3 orbits to stop alongtrack dift
Safe orbit guidance
IAC 2010, Prague 27 Sep
Tango Separationflight data - view on Tango
Tango ACS by magnetorquers only!!
Tango sun acquisition after <10 minutes
IAC 2010, Prague 27 Sep
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
IAC 2010, Prague 27 Sep
GPS calibration
• Characterization of GPS nav system
• Robustness to–Data gaps–dV manoeuvers–Tumbling–Antenna switches
• Result after tuning
Centimeter
accuracy
IAC 2010, Prague 27 Sep
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
IAC 2010, Prague 27 Sep
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
IAC 2010, Prague 27 Sep
Autonomous Formation Flying
AFF 9 days complete motion of Mango relative Tango in alongtrack Closest approach
18 meter !!
• AFF in closed loop• Resize, re-orient shift
relative orbit• Fully autonomous
manoeuver planning and execution
• Fuel optimized
IAC 2010, Prague 27 Sep
Images from DVS camera - Techno Systems
IAC 2010, Prague 27 Sep
•Target search/find
•Orbit alignment
•Autonomous RVD
•100 km to 10 m
Upcoming experiments – Autonomous RVD
VBS photos overlayed
during one orbit
IAC 2010, Prague 27 Sep
•Forced motion between hold points
•GPS or VBS
Upcoming experiments – Proximity Ops
Tango LED pattern
IAC 2010, Prague 27 Sep
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
Auto/Command
Auto/Command
Auto/Command
Auto/Command
Safe
ManualAFF
AutonomousFormationFlying
ARVAutonomousRendezvous
PROXProximityOperations
FARMApproachand
Recede
Command
Command
Command
Default
DLRFormationFlying
CNESFormationFlying
Command
Command Command
Command
Auto/Command
Auto/Command
Auto/Command
IAC 2010, Prague 27 Sep
PRISMA – the In-Orbit Test Bench for FF and RVD
INVITATION !
TAILOR YOU OWN USER EXPERIMENTS ON PRISMA
Follow the missi
on on
www.prismasatellite
s.se
