卫星转动条件下APS星敏感器星像目标中心提取精度分析

空间控制技术与应用

卫星转动条件下APS星敏感器星像目标中心提取精度分析

李晓1，赵宏2

1.北京控制工程研究所，北京100190；2.中国空间技术研究院，北京100094

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-08-26 发布日期:2009-08-26

Analysis of Star Image Centroid Accuracy of an APS Star Sensor in rotation

LI Xiao1，ZHAO Hong2

1.Beijing Institute of Control Engineering, Beijing 100190，China；
2.China Academy of Space Technology, Beijing 100094, China

Received:1900-01-01 Revised:1900-01-01 Online:2009-08-26 Published:2009-08-26

摘要/Abstract

摘要： 目前对星敏感器星像定位的研究多限于静态情况，而卫星转动过程中，在曝光期间星像在像平面不断移动，从而影响星像定位的精度，重点分析动态情况下APS星敏感器星像目标中心的提取精度。首先分析采用质心法计算星像目标中心的误差源，提出动态精度的估计方法，并推导相应的计算公式；进而以给定的APS星敏感器参数为基础，研究了计算窗口、曝光时间等精度影响因素的选择方法；最后通过仿真进行了验证。

关键词: 动态精度, 星像目标中心, APS星敏感器, 质心法

Abstract: Most studies of star image location of star sensors are limited in static state conditions at present, however, the star spot is moving during exposure as a result of satellite rotation, thus influencing the location accuracy of the star image center. In this paper the accuracy of star image center location in dynamic state is analyzed for active pixel sensor (APS) based star sensors. First of all, sources of the location errors produced by the centroid algorithm are analyzed, a dynamic accuracy estimation method is proposed, and corresponding formulas are deduced. Then choice of the calculation window and the exposure time influencing the dynamic accuracy is analyzed based on given APS star sensor parameters. Finally, corresponding simulations are made to validate the conclusions.

Key words: dynamic accuracy, star image center, APS-based star senor, centroid algorithm

中图分类号:

V448.22

李晓1，赵宏2. 卫星转动条件下APS星敏感器星像目标中心提取精度分析[J]. 空间控制技术与应用, 2009, 35(4): 11-16.

LI Xiao1，ZHAO Hong2. Analysis of Star Image Centroid Accuracy of an APS Star Sensor in rotation[J]. , 2009, 35(4): 11-16.

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