Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985stin...8627170k&link_type=abstract
Final Report Royal Netherlands Aircraft Factories Fokker, Schiphol-Oost. Inst. of Sound and Vibration Research.
Astronomy and Astrophysics
Astronomy
Computer Programming, Infrared Astronomy Satellite, Onboard Data Processing, Random Access Memory, Read-Only Memory Devices, Satellite Attitude Control
Scientific paper
After the nominal end of the IRAS mission, in-orbit experiments to demonstrate IRAS reconfigurability aspects and to assess long term performance were initiated. In a computer memory reconfiguration, 3 blocks of 16k 16-bits RAM memory became available for data storage. In the original configuration, 2 blocks of these belonged to the redundant 32k computer system. Since during the operational mission no back-up mode was needed, a ROM implemented back-up mode for the normal safe mode was operated. The back-up mode software in ROM was called by RAM software to provide experiment specific data storage in the extended memories. This approach was also followed for the last experiment in which the satellite recovered from a deliberately saturated reaction wheel (23 Nms). All systems (not including the telescope) operated without substantial degradation.
Ely R.
Gourlay J.
Hameetman G.
Karsten L.
Slippens C.
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