INS/DGPS支持的机载线阵推扫影像几何校正

Geometric Rectification of Airborne Linear Array Pushbroom Imagery Supported by INS/DGPS System

论述了利用INS/DGPS系统的导航输出计算外方位元素的原理,介绍了行方位数据支持下机载线阵CCD影像直接和间接法几何校正的基本方法,重点分析并解决了直接法纠正中的目标定位、灰度重采样及间接法校正中最佳扫描行的确定问题。PH I高光谱影像的实验结果表明,文中的校正算法可达到优于1.5m的绝对定位精度及0.7m的相对精度。

The computation of exterior orientation elements using the navigation outputs of INS/DGPS system is addressed, then the direct and indirect geometric rectification of airborne linear array CCD imagery based on the line orientation data is introduced. The emphasis is put on the positioning and resampling problems in the direct rectification and the determination of the best scan line in the indirect rectification. Test results using PHI hyperspectral image prove that the rectification algorithm developed in this paper can reach the absolute positioning accuracy of better than 1.5 meters and the relative accuracy of 0. 7 meters.