全局环境改正法和永久散射体法在地基合成孔径雷达大气改正中的应用

Application of Global Environment Correction Method and Permanent Scatter Method in GBSAR Atmospheric Correction

地基合成孔径雷达(GBSAR)变形监测技术,能以mm级精度获取大面积连续地表形变,在大坝、滑坡监测方面具有极为广泛的应用前景,是近年研究的热点。但GBSAR测量受大气影响严重,针对如何减弱或去除大气影响问题,该文探讨了两种主要方法,即全局环境改正法和永久散射体法,并结合某大坝的GBSAR变形监测数据进行了相应的计算与分析。初步结果表明两种方法各有局限性,对于气象条件复杂的区域来说,永久散射体法要比全局环境改正法校正精度高。

The ground based synthetic aperture radar （GBSAR） deformation monitoring technology can obtain the large area continuous surface deformation with mm level accuracy. It has a very broad application prospects in the fields of dam and landslide monitoring, and it is a hot research topic in recent years. But it is effected by the atmosphere seriously. In view of how to reduce or eliminate the impact by the atmosphere, this article discusses two main methods, these are the global environment correction method and permanent scatter method. And combined with the GBSAR deformation monitoring data of a dam, the corresponding calculation and analysis are made. The initial results show that the two methods all have its limitations, but in the area of complex weather, the accuracy by the permanent scatter method is better than it by the global environment method.