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为了提供高精度星敏感器姿态测量精度,对三轴定姿受恒星自行影响产生误差的机理进行研究,将恒星自行量分成Ⅰ-Ⅸ级存储在导航星库中,并深入分析不同恒星自行量级在20年间对三轴姿态角输出的逐年变化情况。仿真实验结果表明:利用QUEST方法在20年内对三轴姿态角进行校正后精度可提高75″以上,在星等相近时优先选取自行量级较小的恒星进行姿态解算,使新条件数达到最小,大大提高工程上星敏感器姿态测量的精度和稳定性的要求。
In order to provide high-precision attitude measurement accuracy of star sensor, the mechanism of three-axis attitude error caused by the stellar self-study is studied. The stellar self-volume is divided into Ⅰ-Ⅸ and stored in navigation star database. Level changes in the three-axis attitude angle over the past 20 years. The simulation results show that the accuracy of the three-axis attitude angle can be improved by more than 75 "after 20-year calibration with QUEST method. When the magnitude is similar, the star of smaller order of magnitude is preferentially chosen to solve the attitude, and the new condition number is reached Minimum, greatly improving the accuracy of the attitude sensor on the star and the stability of the measurement requirements.