相邻雷达回波差异检测方法研究与应用

摘要

文章介绍相邻雷达在重叠区回波差异的检测方法,造成邻近两部雷达在重叠区回波差异的原因分为外界因素和内在因素.排除遮挡、地物、超折射杂波及大气衰减等外界因素,根据雨滴直径与下落末速度的关系,对相邻两部雷达基数据进行时间、空间一致性匹配,比较邻近两部雷达在重叠区域中相同时间、相同采样空间上的回波观测值,若仍然存在明显差异,则是由雷达自身一些因素造成的.文章采用了郑州雷达一次频率源故障过程和广东一次飑线过程中的数据作为个例,分析表明该方法能有效检测出相邻两部雷达在重叠区的观测值差异,在全国新一代天气雷达网实时运行监控业务中具有较高的应用价值,当检测出某一部雷达与邻近几部雷达存在明显的观测差异时,可通过报警方式将信息传送至雷达机务人员,以便及时查找和解决雷达的故障问题.%In this paper,one method is proposed to test the echo difference between two adjacent radars' overlap areas.The reasons of the difference can be divided into external and internal factors.The external factors include occlusion,ground/AP clutters,atmospheric attenuation,etc.and all of these external factors are removed by this method.The spatio-temporal consistency is matched according to the relationship between raindrop diameter and falling speed.Then,the reflectivity factors between two radars are compared.If significant difference still exists,it is due to some internal factors.In addition,the paper also discusses two cases,one is the malfunction of frequency source in Zhengzhou Weather Radar,and the other is the squall line in Guangdong Province.Based on the two cases,the method is proved to be able to test the reflectivity difference effectively.Thus,this method could have high application values in weather radar real-time monitoring operation.If reflectivity factor of one radar differs from other radars nearby,the information can be quickly transferred to the maintenance workers so that they can check and solve the problem in time.