Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979engm.repts.....&link_type=abstract
Final Report Engins Matra, Velizy (France).
Astronomy and Astrophysics
Astronomy
Extreme Ultraviolet Radiation, Satellite Design, Systems Engineering, Ultraviolet Astronomy, X Ray Astronomy, Data Transmission, Instrument Orientation, Onboard Data Processing, Satellite Attitude Control, Spacecraft Power Supplies, Telemetry, Three Axis Stabilization
Scientific paper
The EXUV satellite power storage/conditioning system, communication subsystem, data handling subsystem and attitude determination/control subsystem are described. During the launch and acquisition phases batteries supply all power required until the solar array is oriented towards the Sun. During the second year of operation the payload must be switched off for battery recharging. The telemetry system transmits 14 Kbits/sec scientific data to ground stations and 2 Kbit/sec housekeeping data. A 750 bit/sec telecommand rate ensures a 33 s sky map reloading. About 0.25 sec is required for two on/off commands. The onboard data processing system which is under ground control handles satellite orientation, payload activites, satellite housekeeping and scientific data transmission. Three axis stabilization is achieved by continuous x axis pointing towards the Sun with a simultaneous roll motion at nearly constant rate.
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