Abstract：Based on conventional space radiometer method, we integrate the vertical stratification effect of water vapor in troposphere into the correction model, and propose an improved InSAR atmospheric phase delay correction method. To validate the feasibility of the proposed method, the MERIS near-infrared water vapor product is used to reduce the atmospheric phase delay in ground subsidence InSAR monitoring in Beijing. The deformation monitoring results of GNSS stations of crustal movement observation network of China (CMONOC) are used as benchmarks to verify the monitoring accuracy of the improved atmospheric correction method. The results show that RMSE of the improved atmospheric correction method, space-based radiometer method and uncorrected InSAR monitoring results are 0.388 cm, 0.603 cm and 0.685 cm, respectively, compared with the monitoring results of CMONOC GNSS stations, which shows that the improved atmospheric correction method is with higher monitoring accuracy than uncorrected and conventional method, and can effectively reduce the atmospheric phase delay errors in SAR interferograms.
