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根据星敏感器的误差来源和组成,提出了对甚高精度星敏感器的瞬时误差(TE)、高频误差(HSFE)、低频误差(LSFE)三项误差的测试方法。针对星敏感器TE的测试,利用统计高精度静态光星模和基于高精度单星模拟器的星点质心定位误差的方法,得到星敏感器TE的误差;针对星敏感器HSFE的测试,利用高精度转台和单星模拟器,以微步距采集星点弥散斑在不同成像位置时的能量变化,计算星敏感器高频误差;针对星敏感器LSFE误差的测试,利用双轴转台,并且分别旋转转台的两轴,计算星敏感器星像坐标在像面上的变化来获得LSFE的误差。最后文中以某甚高精度星敏感器为例进行试验,结果表明测试方法有效。
According to the source and composition of the star sensor, a test method of three errors of instantaneous error (TE), high frequency error (HSFE) and low frequency error (LSFE) of very high precision star sensor is proposed. According to the test of the star sensor TE, the error of the star sensor TE is obtained by using the statistical high-precision static optical star mode and the positioning error of the centroid and centroid based on the high-precision single-star simulator. For the test of the star sensor HSFE, High accuracy turntable and single-star simulator to collect the energy variation of the speckle spots at different imaging positions with micro-step distance and calculate the high-frequency error of the star sensor. For testing the LSFE error of the star sensor, a dual-axis turntable is used, and Respectively rotate the two sides of the turntable to calculate the change of the star sensor star image on the image plane to obtain the error of LSFE. In the last article, a very high precision star sensor is used as an example to carry out the test. The results show that the test method is effective.