基于两种计算模型的星载SAR定位对比分析

摘要

距离-多普勒(R-D)模型和有理多项式(RPC)模型是星载SAR定位常用的两种计算模型,通过计算机模拟两种模型的实现过程,利用两景高差不同的radarsat-2数据,分别采集高程在45m以内的控制点和高程在128m以内的控制点,对R-D模型和RPC模型定位精度进行对比分析.分析结果表明,随着高程的增加,R-D模型定位精度提高,而RPC模型定位精度下降,因此基于R-D模型的星载SAR定位较适用于高差大的地区.%The range-doppler (R-D) model and the rational polynomial coefficient (RPC) model are two common computer models for space-borne SAR positioning.These two models are implemented and simulated by utilizing two scenes of radarsat-2 images with different elevations.The positioning accuracy for both the R-D model and the RPC model are compared and analyzed,based on the control points collected within the elevation 45m and 128m.Experimental results indicate that with the increasing of the elevation,the positioning accuracy for the R-D model will also increase,however,for the RPC model it will decrease.Therefore,the R-D model based space-borne SAR positioning work better in the areas with drastic elevation differences.