基于R-D模型的星载SAR影像直接目标定位

摘要

For the issue of space-borne synthetic aperture radar(SAR) imagery target geo-location,the paper firstly introduced the principle of Range-Doppler(R-D) model and analyzed different methods according to R-D model and earth ellipsoid model,only using parameters from metadata.It then classified the above methods into two classes systematically: analytical and iterative methods.Finally,all the algorithms were introduced in details and verified,and their position accuracy was elaborately analyzed.The results of experiment indicate that these two types of geo-location algorithm based on R-D model are correct,and have good prospect of application.%针对星载合成孔径雷达对地目标的定位问题,分析了仅利用元数据中的相关参数,根据距离-多普勒模型和地球模型进行对地定位的理论和不同计算方法.系统地提出将现有的基于R-D模型的不同解算方法分为解析和迭代两大类,并对各算法加以介绍和验证,对定位精度作了详尽的比较分析.试验证实了基于R-D模型的两类解算方法的正确性,及其在SAR影像对地目标定位中很好的应用前景.