基于GAMMA软件的二轨差分原理及实验数据处理

合成孔径雷达干涉测量技术（SAR）经过10多年的发展，现已广泛的应用于地球学科的各个领域.目前主流的GAMMA解算软件，采用二轨差分的方法，对实验区的SAR数据进行配准、滤波、去平地效应、相位解缠、差分等处理，最后得到垂直形变图，实现了地表形变的监测.本次研究SAR数据为欧空局的ERS-2卫星数据，DEM分辨率为30 m，采用最小费用流法解缠，得到于雷达视线方向上的形变量，再通过计算与转换，生成垂直方向上的形变图.结果表明，研究区城市中及其周边发现明显的沉降中心，在山区地带基本没有沉降.

THE GAMMA-BASED TWO-TRACK DIFFERENTIAL PRINCIPLES AND EXPERIMENTAL DATA PROCESSING

The technique of synthetic aperture radar interferometry (InSAR),with development more than a decade,has been widely used in various fields of earth sciences.GAMMA,one of the most popular application software,adopts two-rail differential approach to process the SAR data in the experimental area with registration,filtering,flat-earth removal phase,unwrapping and differential treatment,and finally get vertical deformation map,achieving surface deformation monitoring.The SAR data of this study is from ESS-2 satellite,with DEM resolution of 30 meters.The minimum cost flow method is adopted to unwrap the deformation in the direction of radar sight line,and then generate the vertical deformation map.The result shows that subsidence is notable in the city and its suroundings in the study area but rare in the mountainous area.