人工影响天气中雷达回波跟踪方法及其应用

Radar Echo Tracking Algorithm and Application in Weather Modification

基于最大相关系数的雷达回波跟踪方法(TREC),实现了对选定雷达回波区的连续跟踪,使用阳江、深圳、广州、梅州、韶关几部雷达站点的拼图CAPPI格点数据资料,对该连续跟踪方法进行跟踪效果分析。结果表明:对于一般的积层混合云,在一定时间内,利用TREC方法连续跟踪效果较好,随着时间推移,跟踪速度稳定性变差,导致效果逐渐变差。将该连续跟踪方法应用于北京的一次人工影响天气作业过程,使用雷达CAPPI格点数据资料对人工影响天气作业区的回波进行跟踪,从而可以确定不同时刻人工影响天气作业云区所在的位置,同时计算了跟踪到的区域内大于不同给定反射率因子阈值的像素点面积和VIL总量,为此次人工影响天气作业效果评估提供了依据。

The TREC algorithm, based on maximum correlation coefficients, is used in the successtve tracking of selected radar echoes, and its effectiveness is evaluated by using the CAPPI grid data from Yangjing, Shenzhen, Guangzhou, Meizhou, and Shaoguan radar stations. The results show that, for ordinary mixed clouds, this particular TREC method is effective within a certain time limit, but its stability becomes weak with time beyond the limit, which leads to less satisfying tracking results. Also included is an application case of the TREC algorithm for weather modification operation in Beijing. Tracking is made with the CAPPI grid data to locate different cloud systems in different operational periods. The area of pixels exceeding the threshold and the total VIL of the tracking areas are calculated simultaneously, which can be used as the evaluation reference for weather modification operations.