Abstract
With the star sensor and gyroscope units integrated for attitude determination, it will provide continuous and accurate attitude information for satellites with a high update rate. This integration could take full advantage of each other. In order to guarantee the accuracy of satellite attitude determination, the calibration of its systematic errors is of critical importance. In this paper, a calibration method for the star tracker and GUs integrated system is proposed based on the satellite payload multiplexed. Firstly, the satellite attitude kinematics model is introduced. Then the measurement model with respect to the systematic errors including the installation errors and GUs drift errors is built for the star sensor, the payload and the GUs. Finally, the state model and observation model are established, according to which the systematic errors are calibrated by a Kalman filter. Simulation results indicate that the proposed method is effective at estimating the systematic errors of the star sensor and GUs integrated system.
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