合成孔径雷达影像地形校正半经验模型  

A Semi-empirical Model for Correction of Terrain Influences in SAR Backscattering

作　　者：鲍艳松[1] 王军战[2] 张友静[3] 屈建军[2] 张伟民[2] 陈晨[4] 

机构地区：[1]南京信息工程大学气象灾害省部共建教育部重点实验室,江苏南京210044 [2]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000 [3]河海大学地球科学与工程学院,江苏南京210098 [4]江苏省地质调查院,江苏南京210018

出　　处：《测绘学报》2011年第4期483-488,494,共7页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(40701130;40830639);国家自然科学基金重点项目(Y011441001)

摘　　要：结合SAR成像特点和数学理论知识,给出左视、右视两种侧视成像情况下影响地形起伏区域SAR后向散射的本地入射角理论计算模型,基于微波散射物理模型AIEM,模拟不同雷达入射角下地形坡度、坡向对SAR数据后向散射的影响,结果表明雷达入射角相对较小的SAR数据受地形起伏影响较小,是地形起伏地区SAR应用的最佳数据源。并提出一种SAR影像后向散射系数的地形校正半经验模型。地形校正过的SAR影像分类总体精度较未校正SAR影像提高12%。A simple semi-empirical model was proposed for the correction of terrain influences in SAR backscattering.Firstly,the calculation model of local incidence angle was derived based on the SAR imaging characteristics.Secondly,the effects of the terrain slop and aspect on the SAR backscattering in three different look incidence angles were simulated by the advanced integral equation model（AIEM）,the results show that low incidence angle SAR data was affected less by the terrain influences,so it is the optimum data for the applications in the topographic relief regions,and there is a good quadratic function relation between the SAR backscattering coefficient and the local incidence angle,and hereby presents the semi-empirical model for the correction of terrain influences.Finally,the semi-empirical model was validated by both of the simulation data and the ASAR data,the correct results show that the semi-empirical model will offer help to the application of SAR data.

关 键 词：合成孔径雷达 地形校正 先进积分方程模型 半经验模型 后向散射 

分 类 号：P237[天文地球—摄影测量与遥感]