由于大视场光学镜头的加工误差和光敏感器件装配误差的存在,星敏感器实际模型与理想模型存在一定的差别.未校正的非线性误差对星点角度的测量影响很大.基于单星平行光入射标定模型,得出测试点与标定点之间旋转角的数学关系.以相邻点畸变误差近似相等为前提条件,完成测试星点的旋转角的畸变校正.结果表明,统计误差由校正前的7.257个像元降低到了0.246个像元.

Because of the processing error from large field lens and assembly error of sensor devices,there is a certain difference between the actual model and the ideal model of star trackers.The nonlinearity error uncorrected impacts the angle measurement of the star point.Based on the model of single star parallel incidence,the mathematical relationship of rotation angels between the test points and calibration points is obtained.The precondition for distortion correction of rotation angels of test points is that the distortion error of adjacent point is approximately equal.The results show that the statistical error is reduced from 7.257 pixels to 0.246 pixels.