线阵推扫光学卫星外方位元素自检校方法

A Method of Exterior AutoCalibration for Linear CCD Array Pushbroom Optical Satellites

摘要:

在深入分析线阵推扫光学卫星外方位元素误差对几何定位影响特性的基础上，利用俯仰角、滚动角误差引起几何定位误差的方向特性，提出了不依赖地面控制点的外方位元素自检校方法.采用仿真数据验证了方法的正确性，结果表明该方法能够补偿外方位元素误差，有效提升无控几何定位精度.

关键词:几何检校场; 外检校; 自检校; 几何定位精度

Abstract:

An exterior autocalibration method without relying on ground control points (GCPs) was proposed based on the analysis of the errors of exterior orientation elements affecting positioning accuracy. The character that the positioning error caused by pitch angle and roll angle is equal in value but opposite in sign is used as the foundation of the method. Moreover, the proposed method can be verified by the simulation data. Experimental results show that errors of exterior orientation elements can be compensated and geometric accuracy can be effectively improved without relying on GCPs.

Key words:permanent test fields; exterior calibration; selfcalibration; geometric positioning accuracy