“Against the backdrop of increasingly serious surface subsidence problems in the Beijing Tianjin Hebei region, this paper uses Sentinel-1A data to address the issue of inconsistent Doppler centers between TOPS mode images. By utilizing external high-precision POD orbit and DSM data for frequency shift filtering iterative registration, and integrating and optimizing a large-scale surface deformation monitoring method based on point target time series analysis, reliable application accuracy is provided for large-scale surface subsidence investigation and monitoring.”