Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gdss.rept...51h&link_type=abstract
In ESA, Ground Data Systems for Spacecraft Control p 51-55 (SEE N91-22189 14-17)
Astronomy and Astrophysics
Astronomy
Availability, Ground Based Control, Hipparcos Satellite, Reliability, Satellite Control, Spacecraft Recovery, System Effectiveness, Contingency, Countermeasures, Payloads, Satellite Guidance, Spaceborne Astronomy
Scientific paper
The Hipparcos satellite, launched on 8 Aug. 1989 is described. The Hipparcos mission was planned to prepare catalogues of the position of stars to accuracies at the milliarc second level. In order to achieve this ambitious aim, a continuous uplink of instructions to the payload is necessary. This imposes severe availability and continuity requirements. The effect of these reliability requirements in the ground control system is discussed. The failure of the apogee boost motor firing had the consequence that the geostationary orbit could not be reached. Modifications to the ground control system to accommodate the recovery mission are described. Preliminary figures on availability and continuity since the start of the mission are given which demonstrate how the requirements are being met.
Harborne J.
Head Nigel C.
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