Comparison and Validation of Reflectivity of Dual Linear Polarization SA Radar and CINRAD SA Radar

Abstract—This paper uses Haikou ’s dual linearly polarized SA bond radar (Z9898) and Dongfang’s SA band new generation Doppler weather radar (Z9072) to compare and analyze a precipitation process that occurred in Hainan Province on July 2, 2019, and carefully compared the relationship between the reflectivity factors of the two radars to study the detection ability of dual polarization radars. Considering the consistency of radar observations, this study selected the reflectivity factors near the mid-perpendicular line of the two radars for comparison, and used the bilinear interpolation method to interpolate the radar reflectivity volume scan data in the spherical coordinate system to the grid under coordinate system to obtain the CAPPI (Constant Altitude Plan Position Indicator), and compare the reflectivity factors of the same height, and then draw and analyze a scatter plot of the reflectivity factors. At the same time, two The probability distribution of the reflectance factors of the two radars in the selected area is compared, and the mean, standard deviation and correlation coefficient of the observation data of the two radars in the area are counted. Finally, the rainfall estimation is performed according to the Z-R relationship. Experiments show that for areas of the same distance from two radars, the observation data of dual-linear polarization radar is significantly larger than that of CINRAD-SA radar; and through statistical analysis, the average value of dual-polarization radar is 7.7 dBZ greater than CINRAD-SA and the standard deviation is 0.32 lower, indicating dual-linear polarization radar performance is better than the CINRAD-SA radar; finally, the rainfall calculation result of the dual linear polarization radar is greater than that of the CINRAD-SA radar.