Study on the Backscatter Differential Phase Characteristics of X-Band Dual-Polarization Radar and its Processing Methods

The differential propagation phase (ΦDP) of X-band dual-polarization weather radar (including phased-array radar, X-PAR) is important for estimating precipitation and classifying hydrometeors. However, the measured contains backscatter (δ), which poses difficulties application from radars. This paper presents following: (1) simulation characteristics analysis based on disdrometer DSD (raindrop size distribution) measurement data; (2) an improved method specific (KDP) estimation linear programming elimination; (3) effect elimination X-PAR. results show For raindrop equivalent diameters D > 2 mm may cause a between 0 20°; in particular, varies sharply with 3.2 4.5 mm. Using or smoothing filters to process could suppress phase, but it hard completely eliminate phase. Backscatter correction improve calculation accuracy optimization was verified by self-consistency polarimetric variables, correlation estimations S- quantitative estimation. X-PAR deployed Shenzhen showed good observation performance potential be used mosaics S-band radar.