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光学系统星点定位精度是表征星敏感器性能的一个重要指标,像差对该精度有一定影响。分析光学系统像差对星点定位精度的影响,在计算典型中等精度星敏感器光学系统星点定位误差的基础上,提出用实际测得的星点光斑能量质心位置计算理想位置的误差补偿新方法。计算结果表明:像差对高精度(如角秒级)星敏感器姿态测量精度的影响不可忽略;采用星点定位误差补偿后,星敏感器三轴姿态测量误差RMS值分别为0.38″,0.38″,5.77″,仅为原来的1/17。
Optical system star point positioning accuracy is an important indicator of the performance of the star sensor, aberration has an impact on the accuracy. Based on the calculation of the star point location error of a typical medium precision star sensor optical system, the error compensation of the ideal position is calculated by using the actually measured position of the star point spot energy centroid method. The calculated results show that the influence of aberrations on the attitude measurement accuracy of star sensor with high accuracy (such as angular seconds) can not be neglected. The error of three-axis attitude measurement error of satellite sensor with the compensation of star point positioning error are 0.38 “and 0.38 ”, 5.77", only 1/17 of the original.