基于矩心算法建立了星敏感器定位精度模型,从理论上分析了星敏感器定位精度的主要影响因素,推导出温度、积分时间和开窗大是影响星敏感器定位精度的主要因素,利用所研制的ST-1型星敏感器,通过实验定量地测试出了不同的温度、积分时间和开窗所带来的定位精度误差,并选择实验所得到的参数,通过ST-1型星敏感器进行野外实测,实测结果证明合适的温度、积分时间和开窗大小是获得高质量定位精度的前提。

A mathematical model of the position accuracy is built based on centroid arithmetic. The factors that restrict the position accuracy of star sensor are analyzed. The result shows that the size of the window, integral time and temperature are important factors that restrict the position accuracy of star sensor. The error of the position accuracy caused by those factors is tested by ST-1 star sensor. The result shows that the integral time, temperature and the size of window that fit the star sensor are the premise of the high position accuracy.