Abstract
Global navigation satellite system (GNSS)-based interferometric synthetic aperture radar (InSAR) can be considered as a distributed system. Traditional persistent scatterer (PS)-InSAR technique cannot be directly used due to the large point spread function (PSF) of GNSS-based InSAR. In this paper, a PS point selection algorithm based on edge detection and PSF comparison is proposed. First, the PSF of the strong points are extracted based on the edge detection. Then the coherence coefficient is calculated based on the theoretical PSF to obtain the PS candidate (PSC) points. Raw data is used to verify the effetiveness of the proposed algorithm in GNSS-based InSAR.
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