升降轨PSInSAR观测反演沉降与水平向位移试验

Experimental study of vertical and horizontal displacement retrieval by joint analysis of ascending and descending PSIn SAR data

In SAR观测的解算值为雷达视线向形变量,在具备多个方向独立观测的条件下可利用最小二乘方法反演垂直、东西甚至南北方向的形变量。由于难以同时获取上下、东西和南北3个方向上的独立观测值,因而可利用升降轨模式实现对垂向和东西方向移动量的估计。以PSIn SAR监测所获取的形变速率为观测值,利用二维简化模型求解地面沉降量和东西方向移动量。结果表明,研究区形变以沉降为主,水平方向移动微小,证明了升降轨PSIn SAR在地面沉降中的适用性和可靠性。

Multi-track InSAR measurements provide the potential for 2 D and 3 D displacement field retrieval and are commonly applied to coseismic deformation and earthquake source parameters estimation. Actually it is not possible to estimate 3D displacement vector since we can＆#39;t generate 3D observations for the same area. Joint analysis of ascending and descending PSInSAR data enables the retrieval of vertical and horizontal displacement according to the sensitivity of InSAR measurements in different directions. In this paper, the authors made an experimental study of vertical and horizontal displacement retrieval by joint analysis of ascending and descending PSInSAR data. A novel model has been adopted to estimate vertical and east - west displacement with the ascending and descending data. The retrieval displacement indicates that the difference between ascending and descending PSInSAR measurements is not clear and the single track PSInSAR can be well applied to subsidence monitoring.