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青藏铁路多年冻土区域路基稳定性关系到青藏铁路能否长期安全运营,因此对铁路沿线冻土区进行形变监测有着非常重要的意义。近年来,雷达差分干涉测量(D-InSAR)技术已发展成为监测地表形变的一项重要技术手段。本文利用此技术结合重复轨道ENVISAT ASAR雷达影像数据,获取青藏铁路羊八井-当雄区冻土形变结果,所得形变结果与冻土冻胀融沉的物理变化规律非常符合,说明采用D-InSAR技术提取铁路沿线冻土区域大范围地表形变信息的效果良好。
The stability of the subgrade in the permafrost region of the Qinghai-Tibet Railway is related to the long-term safe operation of the Qinghai-Tibet Railway. Therefore, it is of great significance to carry out deformation monitoring of permafrost regions along the railway line. In recent years, the technique of radar differential interferometry (D-InSAR) has been developed as an important technique for monitoring the deformation of the earth’s surface. In this paper, we use this technique to obtain the frozen soil deformation of Yangbajing-Dangxiong area of Qinghai-Tibet Railway by using ENVISAT ASAR radar image data of repeated orbits. The obtained deformation results are in good agreement with the physical changes of frost heave and thaw settlement in permafrost, indicating that D-InSAR The technology of extracting the large-scale surface deformation information in permafrost regions along the railway is effective.