大天线X波段双偏振天气雷达数据质量评估

Evaluation on data quality of X-band dual-polarization radar with large antenna

文章使用标准差分析法对江苏苏北地区大天线X波段双偏振天气雷达数据进行质量评估,结果发现大丰、宝应2部X波段双偏振雷达的反射率因子、差分反射率数据较为可靠,互相关系数对衰减和干扰杂波等敏感度更高,数据波动较大;在冰雹天气观测过程中,由于冰雹对散射相位差影响较大,差分传播相位标准差数据波动大于其他类型降水过程观测数据。对不同波段天气雷达进行对比观测发现,X波段天气雷达起到了对低空天气系统观测的加密覆盖,但衰减现象依然明显,最大回波强度低于S波段天气雷达约10 dBZ,衰减后的风暴单体结构有一定变形。

This paper uses the standard deviation analysis method to evaluate the quality of radar data from X-band dual-polarization radar with large antenna in northern Jiangsu province.It finds that the reflectivity factor and differential reflectivity data from two X-band dual-polarization radars are comparatively reliable in Dafeng and Baoying.The number of interrelationship is more sensitive to attenuation and interference clutter, etc.,and the data fluctuates widely.In the process of hail weather observation, the standard deviation data of differential propagation phase fluctuates more than the observation data of other types of precipitation processes due to the large influence of hail on the scattering phase difference.Comparative observations of different bands of weather radar found that X-band weather radar played an encrypted coverage of low-altitude weather system observation, but the attenuation phenomenon is still obvious, the maximum echo intensity is about 10 dBZ lower than that of S-band weather radar, and the attenuated storm monolith structure has some deformation.