Monitoring Ground Displacement in Mining Areas with Time-Series Interferometric Synthetic Aperture Radar by Integrating Persistent Scatterer/Slowly Decoherent Filtering Phase/Distributed Scatterer Approaches Based on Signal-to-Noise Ratio

During the interferometric synthetic aperture radar (InSAR)-based ground displacement monitoring in mining areas, overlying land is mainly covered by low vegetation and arable land, which makes interferograms acquired InSAR techniques easily susceptible to decorrelation, resulting quantity density of highly coherent points (CPs) are not enough reflect spatial location spatio-temporal evolution process displacement, hardly meeting requirements high-precision monitoring. In this study, we developed an approach for areas integrating Persistent Scatterer (PS), Slowly Decoherent Filtering Phase (SDF), Distributed (DS) based on signal-to-noise ratio (SNR) increase CPs. A case study a area Heze was carried out verify reliability feasibility proposed method practical applications. Results showed that there were four significant CPs maximum 6.7 times conventional PS-InSAR technique 2.3 SBAS-InSAR technique. The increased significantly. information presented more detail. Moreover, results consistent with extracted methods terms trends magnitudes.