基于模板匹配法的长乐雷达强超折射回波识别

One Method Based on Template Matching to Remove Strong Anomalous Propagation Echo at Changle Site

我国有许多新一代天气雷达架设在高山上,由于海拔高度较高,加上地球曲率的影响,在使用VCP11/VCP21模式探测时,造成较大的探测盲区,对低层降水回波的探测能力严重不足。长乐新一代天气雷达经过调整观测模式后,采用负仰角扫描有利于中小尺度灾害性天气系统的监测和预警,但同时会带来地物回波增强、海浪回波及超折射等负面效应。基于此,通过大量个例统计并分析长乐雷达在特定大气条件下的强超折射回波特征,借助模式识别理论提出了一个新方法"模板匹配法"识别强超折射回波。利用大量强超折射回波数据的检验和分析,结果表明该方法能够在不影响负仰角扫描模式下有效滤除长乐雷达的强超折射回波。目前该方法正在试运行,即将应用到中国新一代天气雷达建设业务软件系统开发ROSE项目中。

In China, there are several weather radars built in high mountains. Due to the high altitude and the curvature of earth, low level observation is limited if the conventional volume scan strategies （VCP12/ VCP22） are adopted. At Changle Site, new volume scan strategies which adopt 0° or negative elevation angles bring lots of benefits for monitoring and warning severe weather, but also increase the chance of disadvantages, such as ground clutter, wave clutter, anomalous propagation （AP） and so on. This paper discusses the characteristics of strong AP clutter at Changle Site, introducing a method based on template matching to remove it. The method does not have any impact on new volume scan strategies, but can remove the strong AP effectively. Now the method is running in test, and to be used in the Radar Operational Software Engineering （ROSE）.