镜筒热形变对星敏感器测量精度的影响  

Effect of Barrel's Thermal Deformation on Measurement Error of a Star Sensor

作　　者：刘海波[1] 郝云彩[2] 谭吉春[1] 谭威[1] 刘一武[2] 

机构地区：[1]国防科技大学,长沙410073 [2]北京控制工程研究所,北京100190

出　　处：《空间控制技术与应用》2008年第5期22-25,64,共5页Aerospace Control and Application

摘　　要：空间环境温度以及阳光热效应对星敏感器测量精度有一定影响。研究镜筒热形变对星敏感器测量精度的影响,计算温度均匀分布和非均匀分布条件下,圆柱形镜筒和圆锥形镜筒热形变导致的透镜倾斜量和平移量,研究典型星敏感器光学系统中恒星像斑位置和能量分布的变化情况。在镜筒温度均匀分布条件下,温度变化20℃时,圆柱形镜筒和圆锥形镜筒的星敏感器测量误差分别为0.6″和0.9″;在镜筒温度非均匀分布条件下,镜筒上侧与下侧的温差为30℃时,圆柱形镜筒和圆锥形镜筒测量误差约为2.2″和3.3″。计算结果表明,圆柱形镜筒热稳定性优于圆锥形镜筒。Measurement error of a star sensor is restricted by varying ambient temperature and solar irradiance. Effect of barrel＇ s thermal deformation on measurement error of a star sensor is analysed in this paper. The tilting and shifting of the lens caused by barrel＇ s thermal deformation are calculated for a typical optical system of star sensor. Displacement of star image point and its energy distribution are analyzed. When barrel＇s temperatures change uniformly 20℃ ,measurement errors of the star sensor are about 0.6″ and 0.9″ for cylindrical and conical barrel respectively. When temperature differences of barrel are 30℃ , measurement errors are about 2. 2″ and 3. 3″ for cylindrical and conical barrel respectively. Results show that cylindrical barrel＇ s thermal stabilization is better than conical barrel＇ s.

关 键 词：星敏感器 测量误差 热光分析 镜筒 

分 类 号：V245.6[航空宇航科学与技术—飞行器设计]