Abstract
This paper presents the design and flight experiences of the Attitude and Orbit Control Subsystem (AOCS) for the Marine Observation Satellite-1 (MOS-1), which was launched in February 1987. Three major topics for regulator design are solar paddle flexibility control by thrusters, nutation damping by Momentum Wheels, and continuous magnetic unloading for attitude stability. The flight data and their evaluation results are shown for the initial acquisition, and normal operation. As one of anomaly experiences, safety mode transition related to Earth Sensor presence signal loss is described.
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