センサ融合による衛星姿勢決定系の広帯域化

概要

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This paper discusses a bandwidth extension of a spacecraft attitude determination filter. It supposes an offline determination by the ground processing with on-board sensor telemetry data. The bandwidth of the filter is extended via sensor fusion, where an attitude sensor, a low-bandwidth angular rate sensor, and a high-bandwidth angular rate sensor are used. The bandwidth of each sensor is different and each bandwidth involves a common frequency region. A high-bandwidth attitude determination filter is proposed. The angular rate input for the low-bandwidth attitude determination filter is extended to the high frequency range with a complementary fashion. The complementary filter has a flat gain property and a zero phase property. By numerical simulation of three-axis spacecraft attitude vibration, both the bandwidth extension and the accuracy improvement of the attitude determination filter are verified.