基于RD模型的SAR影像正射纠正研究

Study on Orthorectification of SAR Image Based on Range-Doppler Model

介绍了基于RD模型进行SAR影像正射纠正的基本原理,并将不同方案的试验结果进行定量分析。实验研究表明,利用RD模型进行SAR影像正射纠正是正确、有效的,利用稀少控制点便能获得高精度。不使用任何控制点和DEM,只利用卫星参数进行纠正,导致系统误差大,在实际生产中的应用不广泛。高程误差对平面位置误差影响较大,DEM的高程误差越小,DOM精度越高。参考DEM的高程误差是DOM产品精度的关键因素。

The basic principles of orthorectified SAR image based on RD model are described.The quantitative analysis of different experiment results has shown that the orthorectified SAR image through RD model is correct and effective,while the rectification only through satellite parameters without control points or DEM will result in the systematic error and less effective application to the production.The height error has great influence on the plane position error-the fewer height errors DEM has,the more accurate DOM is.Therefore DEM height error is a key factor to determine DOM precision.