The brain of the satellite
Abstract
The on-board computer of the IRAS is characterized. The computer comprises two identical units provided with ROM (3K 16-bit work words) and RAM (32K 18-bit words) and linked so that either has access to the RAM of the other. The computer controls the data flow for telecommands, telemetry and housekeeping, experiments, and attitude control via a bus system. All RAM programs can be added to or corrected from the ground to give maximum flexibility, and provision is made for automatic switchover from one unit to the other on the basis of hardware self-tests, software tests, an attitude-control-limit test, or an overcurrent-protection criterion.
- Publication:
-
Ruimtevaart
- Pub Date:
- August 1983
- Bibcode:
- 1983Ruimt..32..127V
- Keywords:
-
- Airborne/Spaceborne Computers;
- Infrared Astronomy Satellite;
- Satellite Design;
- Spacecraft Control;
- Housekeeping (Spacecraft);
- Random Access Memory;
- Read-Only Memory Devices;
- Satellite Attitude Control;
- Self Tests;
- Spacecraft Communication;
- Spacecraft Instrumentation