中文摘要：

为探究D-InSAR技术监测矿区沉陷能力，在SRTM DEM外还用到ASTER GDEM作为外部DEM进行二轨法差分。基于6景TerraSAR-X数据的干涉实验结果表明，长基线像对失相干严重，选取像对进行沉陷监测还需特别考虑时间基线和空间基线的影响；利用短基线像对基于GDEM、SRTM的二轨法差分结果表明，两种DEM均能够很好地监测到矿区发生沉降位置，随着开采情况的进展，两者监测得到的干涉条纹在边缘、细节及所能监测到的最大沉降量等方面有所差别。

英文摘要：

In order to research into the monitoring capability of D-InSAR technique on mining subsidence, ASTER GDEM was applied beyond SRTM DEM as an external DEM for two-pass differential method. An interference test based on 6 TerraSAR-X images was carried out. Results showed that image pairs of long baseline decorrelated seriously, thus special consideration should be taken to temporal and spatial baseline on selecting image pairs to monitor subsidence. Two-pass differential method based on GDEM~SRTM wasused by image pairs of short baseline. Results showed that a- bove two kinds of DEM both could monitor the mining sub sidence accurately. However, with the processing of the mining activities, there were differences among the genera- ted interferograms in aspects of edges, details and the maxi- mum settlement.