R-D与共线模型在星载SAR影像正射纠正应用中的对比分析

对常用于星载SAR影像正射纠正的R-D模型与共线模型的原理及各解算步骤中存在的共性与异性进行了分析,并利用实地布设的角反射实验数据对两种模型的解算结果进行了对比。分析表明,两种模型建立在不同的原理、假设基础之上,其内部相同物理参数的解算结果也有差异,但两个模型的精度输出基本一致。

Difference Analysis of R-D and Collinearity Model Used for SAR Image Ortho-rectification

For the two commonly used orho-rectification models in spaceborne SAR, which are collinearity model and range-Doppler (R-D) model, we proposed an analysis for the common and opposite characteristics existing in their principle and solving steps in sequence. Moreover, we made a comparison for the computation result based on the on-site experiment data obtained by corner reflectors as well. Experimental results illustrate that although the two models should not only be based on entirely different principles of hypothesis, but also own different computation results with the same internal physical parameters, the output accuracy of the two models are basically the same.