analysis and application of X-band dual-polarization parameters of ground clutter

In this paper, X-band dual polarization radar is taken as the test platform at Key Laboratory of Atmospheric sounding of China Meteorological Administration. Statistical characteristics of dual-polarization parameters of ground clutter and weather echoes are presented with analyzing clear and precipitation radar echoes in 2010 at Chengdu. The results show that the correlation coefficient of most ground clutter are less than 0.85, while the correlation coefficient of most weather echoes are greater than 0.90; The differential reflectivity of ground clutter is randomly polarized, the intensity distribution covers -20 ~ 20dB, and the mean concentration is 0 dB and the weather echoes are concentrated at -3 ~ 6dB; The KDP of ground clutter covers the entire g interval, and the KDP of weather echoes are concentrated from -6 to +6 deg/km. Test data show that the KDP distinguishes the difference between clutter and weather echoes obviously. The important parameters of identifying ground clutter are KDP, ZDR and ñhv. Base on occurrence possibility of polarized parameters about clutter and weather echoes, fuzzy logic is utilized to identify ground clutter. Furthermore, the calibration of ZDR is taken with ground clutter recognition. The short-term mean of ZDR bias was -2.15dB, and the standard variance of ZDR bias was 0.28dB within four hours.