DInSAR技术对不同方位形变的敏感性研究

The Sensitivity of DInSAR to Surface Deformation in Different Direction

以DEM数据为假想的地面目标,只考虑距离对相位的影响,模拟竖直向、距离向和方位向形变的干涉纹图,从而研究DInSAR技术对空间不同方位形变的敏感性。在所有模拟参数和形变位移大小都相同的情况下,三个不同方位形变所产生的相位从0到2π变化的完整干涉环的数目是各不相同的,揭示DInSAR技术对不同方位地表形变的敏感性存在差异,且敏感性由大到小依次为:竖直向、距离向和方位向。

DInSAR technique only measures one dimensional component of the surface deformation in the satellite＇s line of sight, but the real deformation may be not in the satellite＇s line of sight. Can the DInSAR technique be used to measure the deformation.9 For this, this paper has modeled the interferograms of deformation in vertical, range and azimuth direction, using digital elevation model of terrain as given object and only considering the affection of distance to phase, so as to study the sensitivity of DInSAR to deformation in different orientation. The numerical simulation results show under the condition of the same model parameters and the same size of deformation, the number of the whole interferogram ring whose phase changes from 0 to 2π is distinct, modeled by three different deformations. Moreover, the sensitivity of DInSAR to deformation in different direction is diverse and the sensitivity value from large to small is vertical, range and azimuth.