航天器扫描镜成像位置误差补偿技术

贾英宏; 徐世杰; 陈统

航天器扫描镜成像位置误差补偿技术

北京航空航天大学宇航学院, 北京 100191

详细信息

中图分类号: V 448. 22⁺ 2
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出版历程
- 收稿日期: 2010-10-18
- 网络出版日期: 2012-02-29

Imaging position error compensation of scan mirror for spacecraft

School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

摘要: 研究地球静止轨道航天器两自由度扫描镜成像位置误差补偿问题,即通过对扫描角的补偿,使光轴在地球表面的成像点位置与标称位置相同,消除探测区域的位置偏差.在考虑扫描镜法线偏移、姿态偏差以及轨道误差条件下,推导了光轴成像点的地心经纬度计算公式.给出了上述3类误差的具体描述方式,并分析了各种误差对光轴成像点位置的影响关系.基于角度误差的小量假设条件,给出了扫描镜的步进角/扫描角补偿量的显式算法.针对法线偏移信息一般难以准确测量的问题,提出了一种利用扫描镜在特定工作模式下的光轴惯性空间定向能力和法线偏移的长周期特性对其进行估计的方法.仿真结果表明,所提出的补偿方案和算法能够显著提高成像点位置精度.
- 扫描 /
- 成像 /
- 地球静止轨道卫星 /
- 误差补偿 /
- 误差估计
Abstract: An imaging position error compensation algorithm was proposed for a two-degree-of-freedom scan mirror of a geostationary spacecraft. The investigation aimed to eliminate the detecting area error on the earth surface by compensation of the mirror scanning angles. The formulas for calculating the geocentric longitude and latitude of the imaging point were deduced in which three types of errors, the mirror normal deviation, satellite attitude error and orbit error, were considered. Then the descriptions of the error sources were presented, and the effects of the errors on the imaging point position were analyzed. Based on the small quantity assumption of the angular errors, the compensation algorithms for east-west scanning angle and south-north stepping angle were proposed in explicit formulations. As the normal deviation was difficult to be measured accurately, an estimation algorithm for normal deviation was proposed based on the ability of accurate orientation determination of the optical axis in special operation mode and the long-period characteristic of the normal deviation. The simulation results indicate that the proposed compensation scheme and algorithm improve the imaging position accuracy evidently.
- scanning /
- imaging /
- geostationary satellites /
- error compensation /
- error estimation

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参考文献(12)

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