用D\|InSAR技术测量地面形变位移三分量

SAR图像按轨道和天线视向划分有升轨左视、升轨右视、降轨左视和降轨右视四种类型，仅采用其中的一种SAR图像测量地面形变，会因为D\|InSAR技术仅对视线方向位移敏感而产生误差.本文在介绍D\|InSAR测量原理的基础上，详细导出了由视线方向形变量计算真实形变位移三分量的一般表达式，分析了用D\|InSAR技术测量形变位移三分量存在的困难，最后给出了可能解决途径.

Measuring three components of surface deformation displacement using D InSAR technique

According to orbit and antenna looking directions,there are four types of SAR images which are the ascending-pass left-looking image,the ascending-pass right-looking image,the descending-pass left-looking image and the descending-pass right-looking image.Because D-InSAR is merely sensitive to the surface deformation in the antenna's line of sight,errors will emerge when only one kind of image is used to measure surface deformation.Based on the introduce of D-InSAR surface deformation measurement principal,this paper works out the general expression for computing actual three components from the looking directional displacement and analyses the existing difficulties for D-InSAR technique to measure deformation three components.Finally the possible methods to resolve the problem are proposed in this paper.