IN-FLIGHT GEOSTATIONNARY AOCS BASED ON STAR TRACKER

As a conclusion, new AOCS performances are fully compliant to the system requirements and the expected behavior. Compared to the previous generation, AOCS design allows for transfer an on station operation simplification SODERN SED16/26 STR itself has shown a good behavior. Moreover, the tracking robustness has been tested in Van Allen belts during two days with minimum altitude around 6400km : tracking was still maintained and the STR did not meet any difficulties to recover in a few seconds the tracking after the interference with Earth. Tracking robustness has been also tested recently with a significant solar flare peak and no loss of tracking. SB4000 industrialization is well initiated with two another SB4000 launch scheduled before the end of the year and three next year. 3-axis attitude measurement delivered by STR in geostationary orbit is now validated in flight and the next step according to avionics development plan, is to remove the IRES.