标定型星模拟器设计与关键参数测试

为了完成高精度星敏感器关键参数的地面标定,研制单星指向误差优于3″、星间角距误差优于5″的标定型星模拟器。根据标定型星模拟器的工作原理,设计高精度的准直光学系统,从设计结果分析,光学系统有效视场为37°,全视场角内准直光学系统相对畸变≤0.1%,MTF达到衍射极限,可以实现对星点位置的准确模拟。提出单星指向、星间角距等关键参数的误差计算方法并进行测试,实验结果表明:设计的标定型星模拟器的成像精度符合设计指标要求,整个设备可以满足高精度星敏感器地面测试的使用需要。

Design of Calibration Star Simulator and Test of Key Parameters

In order to complete the ground calibration work of the key parameters for high precision star sensor,a cali-bration star simulator whose single star pointing error is better than 3" and interstellar angular error is better than 5" is developed. According to the working principle of the calibrated star simulator, a high precision collimating optical sys-tem is designed. From the design results, it can be seen that the effective field of view is 37° , the relative distortion of the collimating optical system in the whole field is ≤0.1％,and the MTF nearly reaches the diffraction limit. So the design results of the collimating optical system can realize the accurate simulation of the star point position. The error calculation method of key parameters such as single star pointing, interstellar angle and so on is put forward and the practical experiment is done. The experimental results show that the design accuracy of the calibration star simulator meets the requirements of the design index, and the whole equipment can meet the ground test need of high precision star sensor.