Measuring three components of surface deformation displacement using D InSAR technique
用D\|InSAR技术测量地面形变位移三分量

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.