摘要
对房山X波段双线偏振天气雷达的天线性能、接收动态范围、噪声系数、系统定标能力以及接收双通道一致性进行测试分析,结果表明:天线增益和交叉极化隔离度最小值分别为44.73dB和36.1dB、双通道差分反射率ZDR和差分传播相位ΦDP标准差分别为0.02dB和0.26°、双通道的噪声系数最大平均值为2.02dB,均满足该雷达系统相应的指标设计要求;双通道的动态曲线特征和回波强度定标性能一致性存在差异,会对雷达系统探测数据质量造成不利影响。同时对该雷达系统的差分反射率ZDR标定方法进行了探讨,对雷达探测降水个例数据进行了分析。
Beijing Fangshan dual-polarization weather radar＇s antenna performance, receiver dynamic range, noise factor, system calibration ability and the consistency of receiving dual channels are tested and analyzed. The minimum values of the antenna gain and cross polarization isolation ratio and the standard deviation values of the dual channels＇ differential reflectivity ZDR and differential transmission phase are 44.73 dB, 36.1 dB, 0.02 dB and 0.26%, respectively and the maximum average value of the dual channel noise coefficient is 2.02 dB, which all correspond to the index design of the radar system. The differences of dual channels＇ dynamic curve characteristics and the consistency of echo intensity calibration performance will adversely affect the quality of radar system detection data. In addition, the differential reflectivity calibration for the dual-polarization weather radar and an actual detecting precipitation weather case are also analyzed.
出处
《气象科技》
北大核心
2017年第5期776-786,共11页
Meteorological Science and Technology
基金
北京市气象局科技项目(BMBKJ201501001)
北京市科技计划课题(Z161100004516018)
灾害天气国家重点实验室基金(2016LASWB19)
中央级公益性科研院所基本科研业务费专项(IUMKY201703)共同资助
关键词
双线偏振天气雷达
双通道
一致性
dual-polarization weather radar
dual-channel
consistency
