InSAR高程模型及其精度分析

提出了一种改进的InSAR高程模型，建立了高程和干涉相位的直接关系，并对公式推导中一般采用的平行射线近似处理方法所引入的高程误差进行了量化分析。结果表明，对于星载雷达而言，平行射线近似误差不能忽略。给出了近似误差与基线参数的确定性关系及相应的误差传播曲线，有助于误差纠正和重建高精度DEM。另外，基于改进的高程模型，推导出了高程测量误差传播公式，明确了基线长度和方向对测高精度的影响，对合理选择干涉像对具有指导意义。

An Elevation Model of InSAR and Its Accuracy Analysis

An improved elevation model of InSAR which expresses the direct relationship be-tween height and phase has been developed based on the InSAR elevation model of Currie and Baker.The errors introduced by the parallel ray approximation applied in the improved mod-el are analyzed,and the results verify that it can not be ignored for satellite radar system.The error propagation curves and the relation between elevation errors and baseline parame-ters are also given which can be used to rectify the approximation errors and reconstruct the high accurate digital elevation model(DEM).In addition,based on the improved model and error propagation law,an elevation error estimation formula is derived.It gives the definite effect of the baseline length and angle on the elevation accuracy.