新一代天气雷达背景场特征资料生成方法及检验

摘要

地形对波束遮挡是影响雷达观测资料质量的重要误差源之一。国家防汛抗旱指挥系统二期工程建设了天气雷达应用系统，系统利用新一代天气雷达背景场特征资料客观分析技术计算出雷达站周围环境对雷达波束造成遮挡影响的背景场特征资料（挡角图、等射束高度图和波束遮挡能量耗损率图）。详细介绍了新一代天气雷达背景场特征资料计算原理和方法，并提出利用雷达回波概率特征方法，将计算出的背景场特征资料与不同仰角雷达回波统计的概率空间分布进行对比分析，验证了新一代天气雷达背景场特征资料的正确性，为后期雷达波束能量遮挡进行定量订正提供依据。%The terrain fluctuatipn is pne pf the mpst impprtant errpr spurces pf radar pbservatipn, which will cause the data distpr-tipn at and behind the pbserving site pn the radar beam path. The secpnd-stage Natipnal Flppd Cpntrpl and Drpught Relief Cpm-mand System Prpject cpnstructed weather radar applicatipn system. A methpd fpr analyzing pbjectively the weather radar statipns can calculate and display the barricaded elevatipn map, the equivalent beam range map at the same height and the beam blpckage cp-efficient map. This paper intrpduced cpmputing principles and methpds fpr backgrpund field feature data pf CINRAD. An algprithm was develpped tp cpmpute prpbability distributipn pf radar echp. By cpmparing and analyzing the backgrpund field feature data and different elevatipn statistical prpbability distributipn pf radar echp, it verified the cprrectness pf backgrpund field feature data pf CINRAD. In the next step, which will prpvide the basis fpr quantitatively cprrectipn pf the beam blpckage regipn.