An Applicability Analysis of Sentinel-1 Data in Polarization Time-series InSAR Technology

Sentinel-1 data have been widely applied in the Time-series Interferometric Synthetic Aperture Radar (TS-InSAR) technology. To assess the applicability of dual-polarization data from the Sentinel-1 satellite in Polarimetric Persistent Scatterer Interferometry (PolPSI) technology, based on 47 dual-polarization Sentinel-1 images, the surface deformation of Shenzhen and Zhongshan is monitored using both the TS-InSAR technology and the PolPSI technology. The results show that the PolPSI technology using Sentinel-1 data can identify a greater number of Persistent Scatterer (PS) candidates by analyzing the polarization information (scattering mechanism or statistical characteristic) of pixels. The PolPSI technology exhibits lower average temporal coherence on the reference network arc, but it can provide a greater number of high-quality arcs (with a temporal coherence greater than 0.6) . The PolPSI technology can increase the density of PS in urban surface monitoring. In summary, PolPSI technology utilizing Sentinel-1 data can provide more detailed and accurate deformation monitoring information on urban surface compared to TS-InSAR technology.