星敏感器姿态计算精度的仿真  

Simulation of Attitude Precision of Star Sensor

作　　者：张辉[1] 袁家虎[1] 刘恩海[1] 郭昌清[2] 

机构地区：[1]中国科学院光电技术研究所 [2]中国矿业大学理学院,江苏徐州221116

出　　处：《中国矿业大学学报》2008年第1期112-117,共6页Journal of China University of Mining & Technology

基　　金：中国科学院“十五”预研支撑技术项目(42201020101)

摘　　要：星敏感器姿态测量精度是评价星敏感器性能的最重要的指标之一.文中分析了影响星敏感器姿态计算精度的各种因素,给出了对星敏感器姿态计算精度进行仿真的方法,并对各种因素的影响规律做了细致的仿真.仿真结果表明:多参考矢量定姿算法带来的误差可以忽略不计;对于16°×16°视场的星敏感器,选取在视场内分布均匀的9颗星参与姿态计算,是较好的选择;在保持像素分辨率不变的条件下,增大视场可以提高滚动角的精度,但CCD像素数目却增大了.因此,选取视场内均匀分布的较多恒星参与姿态计算、提高星点位置精度都可以提高姿态计算精度.Attitude accuracy is one of the most important parameters to evaluate the performance of the star sensors. The factors which affected the attitude precision of star sensors were studied, and simulation method was described, by which these influencing factors were simulated. The results show that the multiple reference vector algorithmic error is negligible, and it＇s a good approach for star sensor with a 16×16 deg field of view （FOV） to choose 9 stars, which are distributed uniformly in FOV, to calculate the attitude. Under the condition of invariable pixel subtense, a larger FOV reduced roll uncertainties but increased pixels of CCD array. Hence, attitude accuracy can be improved by identifying more stars distributed uniformly and improving star centroiding accuracy.

关 键 词：星敏感器 姿态 精度 

分 类 号：V448.25[航空宇航科学与技术—飞行器设计]