基于斜角坐标系变换的星载SAR直接定位算法

在研究现有距离-多普勒(RD)定位模型解法方法的基础上,发展了一种基于斜角坐标系变换的RD模型直接定位分析算法,并在定位过程中引进了数值解算方法,使该定位算法兼有了纯分析法和纯数值计算法的特点.利用一景ERS-2 SAR SLC数据比较评价了所发展算法与现有算法的定位效果,结果表明,该算法不仅定位精度较高,而且执行效率比纯粹的基于很多迭代过程的数值分析算法有了很大的提高.

The algorithm for direct geo location of spaceborne SAR imagery based on slant angle coordinate transformation

After detailed investigation of the currently available SAR geo-loeation algorithms, an analytical geo-loeation methodology with slant angle coordinate transformation as the major characteristic was developed, and a numerical iteration method was integrated into the geo-loeation process. So this new geo-loeation methodology has the features of both the pure analysis method and the pure numerical method. The geo-loeation accuracy was evaluated using a scene of ERS-2 SAR SLC imagery with the other three published geo-loeation as comparisons. The validation results show that the new geo-loeation algorithm can achieve high geo-loeation accuracy, while the efficiency of geo-location processing is much higher than the pure numerical geo-loeation method built upon many iteration mutes.