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为解决由于色温不匹配对星敏感器光信号定标精度产生的影响,提出一种光谱连续可调星敏感器地面标定系统设计方案.该高精度准直光学系统的光谱范围为500~800 nm,像质测试结果表明,全视场畸变小于0.08%,MTF在60 1p·mm~(-1)处大于0.6.基于DMD光源系统的组成和工作原理,对光谱分辨率和光谱曲线模拟精度进行分析,设计了一套光谱分辨率全谱段优于2nm的Czerny-Turner分光系统.测试结果表明,星点位置精度优于7″;光谱分辨率为10 nm和20 nm时光谱曲线模拟精度分别优于2%和5%,有效降低了由于色温不匹配对星敏感器标定精度的影响.
In order to solve the influence of color temperature mismatch on calibration accuracy of star sensor optical signal, a design scheme of ground calibration system for continuously adjustable star sensor is proposed.The spectral range of this high precision collimating optical system is 500-800 nm , The image quality test results show that the total field distortion is less than 0.08% and the MTF is greater than 0.6 at 60 1p · mm -1. Based on the composition and working principle of the DMD light source system, the spectral resolution and spectral curve simulation accuracy A set of Czerny-Turner spectral system with better spectral resolution than 2 nm was designed and analyzed.The results show that the accuracy of the position of the star point is better than 7 ", and that of the spectral curve at spectral resolution of 10 nm and 20 nm respectively Better than 2% and 5%, which effectively reduces the influence on the calibration accuracy of the star sensor due to the color temperature mismatch.