Wide-Area Spaceborne TOPSAR Interferometric Registration Processing Method

In order to meet the high-precision registration requirements for TOPS mode with multiple Burst images, this paper conducts an investigation into the interferometric imaging methods for multi-Burst data and proposes an improved Enhanced Spectral Diversity (ESD) algorithm registration technique on the basis of Sentinel-1A satellite data. First, the single look complex (SLC) data are subjected to deramping processing, which transforms the azimuth signal into a baseband signal, facilitating next registration processing.The second step include both coarse and fine registration. Some residual systematic offsets still remain after the coarse registration, which need fine registration to compensate.The fine registration presented in this paper has been improved based on the traditional ESD algorithm, simplifying the overall process and enhancing the registration accuracy.Finally, the effectiveness and superiority of this processing method have been verified through experimental validation.