光学学报, 2015, 35 (5): 0511002, 网络出版: 2015-04-03
基于光线追迹逐点匹配的航天时间延迟积分CCD相机机动成像快速几何校正算法
Fast Geometric Correction of Space Time Delayed and Integration CCD Camera Dynamic Imaging Based on Ray Tracing Point Matching
成像系统 机动成像 像移 地面像元分辨率 快速几何校正 imaging systems dynamic imaging image shift ground sample distance rapid geometric correction
摘要
基于线阵时间延迟积分(TDI)电荷耦合器件(CCD)机动成像原理,分析了灵巧卫星在姿态机动过程中动态成像的几何畸变问题。由于地球曲率及姿态机动因素导致像面空间几何映射形状不断改变,通过光线追迹逐点匹配算法推导出了机动成像方式下的空间成像几何关系数学解析表达式。利用小卫星姿态控制系统物理仿真平台对TDI CCD 相机机动成像快速几何校正算法进行实验验证,姿态角确定精度与姿态稳定度优于0.05°、0.005°/s。结果表明,在卫星最大扫描角为45°时,所设计的算法能够解决机动成像几何畸变问题,提高成像质量。
Abstract
Based on the linear array of time delay integration (TDI) charge coupled device (CCD) imaging principle, geometric distortion is analyzed in the process of attitude maneuver while the flexible satellite dynamic imaging. Because of the curvature of the earth and the attitude maneuver factors , the mapping shape of space geometry on focal plane is constantly changing. Dynamic imaging mode of space imaging geometry relationship between mathematics analytic expression is deduced based on the ray tracing point matching algorithm. Then using small satellite attitude control system simulation platform to verify experimentally TDI CCD camera mobile imaging fast geometric correction algorithm. The attitude determine angle accuracy and attitude stability is better than that of 0.05° and 0.005°/s. Results show that when the maximum scan angle of satellite is 45°, the designed algorithm can solve the problem of dynamic imaging geometric distortion and improve the quality of imaging.
杨飞, 曲宏松, 金光, 郑亮亮. 基于光线追迹逐点匹配的航天时间延迟积分CCD相机机动成像快速几何校正算法[J]. 光学学报, 2015, 35(5): 0511002. Yang Fei, Qu Hongsong, Jin Guang, Zheng Liangliang. Fast Geometric Correction of Space Time Delayed and Integration CCD Camera Dynamic Imaging Based on Ray Tracing Point Matching[J]. Acta Optica Sinica, 2015, 35(5): 0511002.