热-光效应对星敏感器测量准确度的影响  

Thermo-optic Effects on Accuracy Performance of Star Tracker

作　　者：刘海波[1] 黄水花[1] 谭吉春[1] 贾辉[1] 杨建坤[1] 杨俊才[1] 

机构地区：[1]国防科技大学理学院技术物理研究所,长沙410073

出　　处：《光子学报》2009年第7期1835-1839,共5页Acta Photonica Sinica

摘　　要：运用"热-结构-光"耦合分析方法,计算典型星敏感器光学系统(6透镜光具组,f=56mm,相对孔径1/1.3)恒星像斑理想质心位移和亚像元内插质心偏移量,研究温度分布对星敏感器测量准确度的影响.以20℃为光学系统标定温度,计算光学系统均匀温度分布、轴向温差分布和上下侧温差分布三种条件下,星敏感器测量误差.均匀分布温度变化20℃时,星敏感器测量误差约0.07″;轴向温差10℃和20℃时,测量误差分别约为0.17″和0.31″;上下侧温差仅2℃时,测量误差就高达1.46″.计算结果表明,上下侧温差分布对星敏感器准确度影响最大,均匀温度分布影响最小.Thermo-optic effects on position accuracy of star tracker was analysised using opto-mechanical coupling method. The displacements of star eentroids and sub-pixel interpolation errors, caused by three kinds of temperature distribution respectively, were calculated quantitatively in a typical optical system of star tracker. The measurement error of star tracker was about 0.07＂, when uniform temperature changed 20℃. The measurement errors were about 0.17＂and 0.31＂, respectively, when temperature difference were 10℃ and 20℃ in axis. And it was as much as 1.46＂,when temperature distribution difference between top of the optical system and the bottom was only 2℃. The results show that temperature distribution difference between the top and the bottom has serious effects on measurement accuracy of star tracker, and uniform temperature distribution has a little.

关 键 词：光学测量 星点定位误差 热-光学分析 星敏感器 

分 类 号：V445.8[航空宇航科学与技术—飞行器设计]