Abstract:Through the study of relaxation parameter, access order, stop rule, non-negativity constraints, as well as the characteristics of water vapor tomography, this paper proposes water vapor tomography constraint ART algorithm (WVTART) based on grouping and sorting. In order to obtain the global solution efficiently and robustly, observation equations should be sorted by the principle of un-correlation. The results verify that the WVTART method can improve the convergence speed and the accuracy of the solution.