星敏感器质心定位的S曲线误差补偿  

S-curve error compensation of centroiding location for star sensors

作　　者：魏新国[1] 徐佳[1] 张广军[1] 

机构地区：[1]北京航空航天大学仪器科学与光电工程学院精密光机电一体化技术教育部重点实验室,北京100191

出　　处：《光学精密工程》2013年第4期849-857,共9页Optics and Precision Engineering

基　　金：教育部新世纪人才支持计划资助项目(No.NCET-10-0037)

摘　　要：由于S曲线误差是星敏感器质心定位系统误差的重要组成分,本文结合质心定位的物理过程及仿真对S曲线误差来源进行了分析。研究了各项误差来源产生的影响,并采用频域分析法得出了S曲线误差的理论解析式。用星敏感器产品进行了实验,采集视场中心S曲线误差并用正弦模型进行补偿,分析了同一补偿模型对全视场S曲线误差的补偿效果,并对标定数据进行了S曲线误差补偿。实验结果表明:视场中心S曲线误差的标准差为0.048pixel,补偿后标准差为0.027pixel,质心定位精度提高了43.8%;进一步采用视场中心正弦补偿模型对全视场S曲线误差进行补偿后,全视场质心定位精度提高了35.7%以上,全视场标定精度提高了31.7%。由实验结果可知:S曲线误差是星敏感器的一项重要误差源,采用正弦模型对S曲线误差进行补偿能够取得显著的补偿效果。As the S-curve errors are important parts of centroid location errors for star sensors, this paper explored the sources of S-curve errors combining with the physical process of centroid location and a simulation. The specific effect of each error source was analyzed and an analytical expression of S-curve errors was calculated by a frequency domain method. The experiments using a star sensor were performed and the S-curve error in the center of the Field of View （FOV） was collected and was compensated using a sine model. The compensation effects on the S-curve errors in the whole FOV were analyzed by the same compensation model and the calibration data were also compensated. Ex- perimental results show that the standard deviation of S-curve error is 0. 048 pixels in the center of the FOV, and 0. 027 pixels after compensation, therefore the precision of centroid location is improved by 43.8 ~//0. Furthermore, after compensating with the same sine model in the center of the FOV for whole field-curve errors, the precision of centroid location in the whole FOV is improved by 35.7% at least and the precision of calibration is improved by 31.7%. It concludes that the S-curve errors are impor- tant errors of star sensors and they can be significantly compensated by using the sine model.

关 键 词：星敏感器 质心定位 S曲线误差 频域分析 误差补偿 

分 类 号：V448.22[航空宇航科学与技术—飞行器设计]