DEM精度对D-InSAR提取地表形变的影响分析

DEM Precision of D-InSAR Extract the Influence of the Surface Deformation Analysis

从双轨法D-In SAR形变测量的原理出发,理论分析了外部DEM对双轨法D-In SAR提取地表形变的影响,得出外部DEM精度与地表形变误差之间存在线性函数关系,在其他参数不变的情况下外部DEM高程中误差越大所引起的形变误差就越大;探讨获取地表形变的技术流程,并结合实例分析了外部DEM对双轨法D-In SAR提取形变精度的影响,分析指出不同精度的外部DEM会直接影响到干涉条纹的数量、密度和质量。

Based on the principle of double track D-InSAR deformation measurement,theoretical analysis of the external DEM of double-track method D-InSAR extract the surface deformation,the influence of external DEM accuracy and there is a linear function relationship between the surface deformation error,in the case of other parameters constant external DEM elevation in the greater the error caused by the deformation error; This paper discusses the technical process of obtaining the surface deformation,and combined with examples and analyses the influence of external DEM two-track approach D-InSAR extraction effect of deformation,analysis shows that the accuracy of different external DEM will directly affect the quality,density and quantity of interference fringes.