采用地基合成孔径雷达技术提取DEM的方法研究

Study on DEM extraction with ground-based SAR interferometry

文章研究了基于地基合成孔径雷达技术的两种DEM测高模型——近似测高模型和改进测高模型,根据星载雷达测高原理推导了这两种模型,并分析模型的精度。通过对近似测高模型中的平行射线近似处理方法进行量化分析,指出近似处理方法引入的高程误差不能被忽略。本文对改进测高模型中各参数的误差传播系数进行了仿真分析,结果表明改进测高模型提高了理论测高精度,并可采用增加基线长度和缩短斜距的方法提高测高精度。

Two altimetry models extracting DEM with GBSAR （Ground-Based Synthetic Aperture Radar） technology were studied in the paper. The approximate altimetry model and the improved altimetry model with GBSAR were derived based on the principles of spaceborne radar altimetry technology. The error caused by the parallel ray approximation in the approximate model was analyzed quantitatively, and the results showed that the errors cannot be ignored for the ground-based radar system. Meanwhile, by analyzing the elevation error with the baseline and range distance, the results showed that the improved altimetry model could improve the theoretical accuracy and the accuracy could be improved by adjusting the baseline and shortening the slant distance.