单幅干涉图像提取震间形变场模拟研究

Simulated study on extraction of interseismic deformation field using a single InSAR image

针对活动断层震间InSAR形变场提取中存在SAR观测数据不足、轨道误差难以合理去除的问题,该文进行了利用单幅InSAR图像提取震间形变场的模拟研究:考虑到InSAR图像中轨道误差和震间形变场的空间分布特征,利用一次多项式模型和深部滑动模型模拟了100组叠加的InSAR形变场;然后采用直接恢复震间形变场、先分离轨道误差再恢复震间形变场、一步法分离轨道误差与恢复震间形变场3种方法对模拟的震间形变场进行了恢复实验。结果表明,基于单幅InSAR图像,利用一步法能够较为准确地恢复震间形变场。

Aiming at the problem of lacking SAR observation, the difficulty of the reasonable removal of orbital errors in the interseismic InSAR deformation extraction of active fault, this paper carried out the simulated study on the extraction of interseismic deformation field using a single InSAR image： consider- ing the spatial distribution features of the orbital errors in the InSAR image and the interseismic deforma- tion field, 100 sets of superimposed InSAR deformation fields were simulated by using a first-order poly nomial model and a dee Psli Pmodel further, three methods, including the method of directly recovering the interseismic deformation field, the method Of first separating the orbital error and then recovering the interseismic deformation field, and the method of simultaneously separating the orbital error and recove ring the interseismic deformation field in one step, were used to carry out the recovering experiment from the simulated interseismic deformation field. Results showed that one ste Pmethod could be adopted to ac- curately recover the interseismic deformation field using a single InSAR image.