改进的光流法反演天气雷达风场.pdfVIP

气象 改进的光流法反演天气雷达风场 1 1 2 3 1 王志斌 肖艳姣 吴涛 崔方 王俊超 1 中国气象局武汉暴雨研究所，武汉 430205 2 武汉中心气象台 ，武汉430074 3 中国电力科学研究院 新能源研究中心， 南京210009 摘 要：介绍一种通过天气雷达回波并结合改进的光流方法对之进行风场反演，计算回波的光流变化得到 运动的矢量场；用Horn Schunck 方法中自带的全局平滑化算子时，其数据的噪声很敏感，且难以达到 全场最优条件；通过加入改进后的平滑算子，可以减少靠向二级最小值的可能；另外通过Lucas Kanade 方法计算局部光流得到小范围的光流场，适当的运用平滑处理得到整场的矢量场，并以它作为改进Horn Schunck 方法的初猜场进行计算，且应用二维连续无辐散质量方程约束，得到比较完整的雷达回波运动 矢量场。通过个例实验分析发现，结合改进的光流法在对流性降水系统影响下效果优于单一使用某种光流 方法的结果。 关键词： 天气雷达 ;风场反演 ;光流法; 约束; 改进 Improving Optical Flow Method Retrieving Weather Radar Wind Field 1 1 2 3 1 Wang Zhi bin XIAO yan jiao WU Tao Cui Fang Wang Jun Chao 1 Institute of Wuhan Heavy Rain, China Meteorological Administration, Wuhan 430205 2 Wuhan Central Meteorological Observatory ,Wuhan 430074 3 China Electric Power Research Institute ，Renewable Energy Center ，Nanjing 210009 【Abstract 】Introduce a weather radar echo and combined with the improved optical flow method for weather radar wind field retrieving, through the calculation of optical flow changes of echo motion vector field; With normal Horn and Schunck method in a global smoothing method is sensitive to noise, and the optimal conditions to meet the full, to join the improved smooth operator, can reduce by the secondary minimum possible; Through Lucas and Kanade method to calculate the local optical flow to get a small range of optical flow field, the use of appropriate smooth processing to get the entire vector field, and with it as improvement Horn and Schunck method of first guess field is calculated. Fina