Quality Control Analysis and Effect Evaluation for S-band Dual Polarimetric Radar

High quality data is the key and premise for the application of dual polarimetric radar. In this paper, quality control is carried out from three aspects: non meteorological echo, differential reflectance (ZDR) and differential phase shift (ΦDP), then a complete quality control scheme for S-band dual polarimetric radar is established, which was proved by seven large-scale monsoon rainstorm in South China from 2016 to 2020. The conclusions are as follows: (1)The Bayesian algorithm can effectively remove the non meteorological echo combined with the texture features of polarimetric variable; According to the micro raindrop method, ZDR can be easily calibrated online; the quality control of ΦDP is processed by the linear programming mathematical method(LP), which can ensure the cumulative increase of ΦDP and non negativity of KDP in the rainfall area. (2) The evaluation results of CSU-HIDRO(Colorado State University-Hydrometeor Identification Rainfall Optimization) show that the normalized error(NE) is reduced by about 13.90% after the quality control scheme proposed in this paper. The research results can provide technical reference for the operational application of polarimetric radar quality control.