合成孔径雷达影像几何处理方法对比实验研究

Experimental Study on Comparison of Geometric Rectification Methods of SAR Images

合成孔径雷达(SAR)由于其全天候、全天时的工作能力,成为近几年来摄影测量与遥感领域的研究热点。概述了合成孔径雷达影像的三种几何处理方法:多项式法、多项式正射纠正法及距离-多普勒方法,对以上三种方法的算法进行了描述;并基于C++程序进行了计算机实现。利用ERS-2数据和RADARSAT数据进行了实验,并对实验结果进行了比较,结果表明:多项式正射纠正方法和距离-多普勒方法纠图精度较高,且纠图精度相差不大;而多项式法在山区纠图精度相对较差。

Due to its capacity of all-weather and all-rime, Synthetic Aperture Radar（SAR） technique has been currently a hot topic in the area of Photogrammetry and Remote Sensing. This paper summarizes three geometric rectification methods of SAR images： polynomial rectification, polynomial orthorectification and range-Doppler rectification,describes the algorithm of the three methods above. Programme has been designed and written in C＋＋. At last of this paper,the programme is tested with ERS-2 and RADARSAT data and the result is compared. The result indicates that the accuracy of polynomial orthorectification and range-Doppler rectification is higher and the difference of the accuracy is little, but the accuracy of polynomial rectification is lower.