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Function/Performance Evaluation Test for Attitude and Orbital Control System of ASTRO-F (FM)

Status Report From: Institute of Space and Astronautical Science (ISAS)
Posted: Saturday, March 22, 2003

The function and performance of the ASTRO-F satellite’s on-board equipment for attitude and orbital control were evaluated at Building C, Attitude System Testing Laboratory, from August 19 to December 13, 2002. In order to evaluate satellite behavior in outer space, attitude and movement of the satellite in orbit were simulated by connecting the Attitude Orbit Control Unit (AOCU) to a Dynamics Simulator computer. In the test, simulated signals of on-board equipment such as sun sensor, star tracker, gyro, etc., were input into the AOCU. The AOCU executes computation for attitude/orbital control based on the simulated signals and the specified command signals, and then outputs the driver signals to the reaction wheel, magnetic torquer, and propulsion-system thrusters. Linking these AOCU signals with the Dynamics Simulator allows us to simulate movement of the satellite in orbit, and to realize a testing environment known as the Static Closed Loop Test (SCLT).

Besides the AOCU, in order to evaluate individual on-board equipment such as sensors, when necessary, real signals from the equipment were used instead of simulated signals. The test was carried out in a plain setting with the satellite equipment and the Dynamics Simulator simply connected to each other on a desk.

We would like to express our gratitude to all those who helped us throughout the test.

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