A PS Deformation Estimation and Error Compensation Algorithm Based on Temporal Coherence for GNSS-based InBSAR

Global Navigation Satellite System-based Bistatic Synthetic Aperture Radar Interferometry (GNSS-based InBSAR) uses on-orbit satellites as transmitters. Therefore, its cost is much lower than that of spaceborne InSAR system. Meanwhile, its repeat-pass time is shorter lead to faster monitoring frequency. However, the system characteristic of low SNR leads to low accuracy of deformation phase extraction. In this paper, A PS deformation estimation and error compensation algorithm based on temporal coherence is proposed. The interferometric phase model of PS in line of sight direction is established. The coherence coefficient is introduced to iteratively estimate the atmospheric phase, deformation rate and deformation acceleration. The IGSO raw data of Beidou navigation satellite are processed. the experimental results show that the average accuracy is 19.48 mm, where the optimal accuracy can reach 16.14 mm.