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Deformation detection performance analysis of SBAS-InSAR technique

SBAS-InSAR technology can extract the time deformation series of the surface by using the multi-navigation SAR data covering the same area, and a large number of research results show that the accuracy of linear deformation rate estimation can reach the magnitude of millimeter, the accuracy of DEM elevation measurement error estimation can reach the level of meter with SBAS-InSAR technology. However, the theoretical limit of specific estimation accuracy is not given clearly. To solve this problem, this paper derived the Cramer-Rao boundary of DEM elevation measurement error and linear deformation rate estimation in SBAS-InSAR technology through theoretical modeling, and quantitatively analyzed the impact of various non-ideal factors such as correlation coefficient, baseline distribution and residual atmospheric phase on the SBAS-InSAR deformation detection performance with Monte Carlo simulations.