Abstract To solve the problem of large monitoring error caused by insufficient spatial distribution of permanent scatterers when PSInSAR is applied to non-urban surface deformation monitoring, we propose an improved PSInSAR algorithm based on partial time scatterers(PTS). Firstly, the image is denoised by edge preserving filtering based on the improved empirical mode decomposition. Then, the PTS target is extracted by the credible probability estimation. Finally, the PTS phase is separated by parameter difference estimation and the deformation rate is calculated to obtain the surface deformation of the monitoring area. The experimental results show that the extracted PTS target basically keeps the spatial distribution characteristics and temporal variation trend of traditional PS points, which improves the spatial distribution density of non-urban target points and verifies the effectiveness of the algorithm.
