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随着青藏铁路的开通,对青藏高原地区进行形变监测显得尤为重要,由于ALOS卫星PALSAR传感器采用的是L波段,相干性得到明显改善,适合于地形较复杂区域和冻土地区监测。本文选择了青藏高原地区部分时间段的PALSAR数据,采用外部DEM,运用GAMMA软件进行二轨法差分干涉测量,获得该地区的形变图。结合实地情况进行定性分析,其形变较好的符合冻土的物理变化规律,证明了PALSAR数据在青藏高原冻土地区运用于形变监测具有良好的前景。
With the opening of the Qinghai-Tibet Railway, it is very important to carry out deformation monitoring of the Qinghai-Tibet Plateau. Since the ALS satellite PALSAR sensor adopts the L band, the coherence has been significantly improved, which is suitable for the monitoring of more complicated terrain and permafrost regions. In this paper, the PALSAR data of some time periods in the Qinghai-Tibet Plateau are selected. The external DEM and GAMMA software are used to perform the two-track differential interferometry to obtain the deformation map of the area. Qualitative analysis based on the field conditions shows that the deformation is in good agreement with the physical variation of frozen soil, which proves that PALSAR data has good prospects for deformation monitoring in the frozen soil area of the Qinghai-Tibet Plateau.