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Research on Calibration Technology of Star Sensor Installation Error Angle

WANG Xin;CAI Shan-jun;WU Liang-hua;HU Qi-lin;Beijing Institute of Automatic Control Equipment;  
The star sensor is a kind of instrument with autonomous high precision attitude measurement ability, whose output attitude accuracy can reach the arc-second level. However, the installation error angle of the star sensor often reaches the arc-minute level in the practical navigation applications. This error is far greater than the instrument error, which restricts its quality of measurement. Therefore, it is necessary to model and calibrate the installation error angle. In this study, it suggests that there is an inseparable coupling relationship between the installation error angle and the inertial attitude error. This paper proposes an installation error angle calibrating method using the attitude, the position of inertial navigation system and the star sensor's attitude to establish observed information and a Kalman filter model is used to fast calibrate the installation error angle on the ground. The simulation results show that the carrier needs two axial attitude maneuvers to estimate the three-axis installation error angle of the star sensor. Compared with the method of calibrating by external reference attitude, the proposed method is faster, more efficient, and of stronger operability.
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