风廓线雷达估测降水云中大气垂直速度的一种方法

Method of WPR Getting Air Vertical Velocity in Precipitation Cloud

利用UHF频段风廓线雷达垂直波束探测降水云时返回信号功率谱中可能同时出现的大气垂直运动谱和降水粒子谱的双峰谱现象,对北京延庆445 MHz风廓线雷达(CFL-08)在2009 2011年降水期间的垂直波束探测数据进行了双峰谱识别,获取的双峰谱数据经过处理,可得到降水返回信号回波强度ZR和静止大气降水下降的平均速度WT数据。采用最小二乘法拟合ZR和WT,发现两者函数关系与返回信号所在高度有关:WT=3.75H-0.085Z0.006H+0.066R,为降水时垂直指向的多普勒雷达获取降水中大气垂直平均运动速度VA提供了有效的方法。

Base on the fact that the returning signal power spectrum of UHF wind profile radar( WPR) in rainy day may contain the air and raindrops vertical velocity information,which is called BS( Bimodal Spectrum),the research work is done to recognize BS of Beijing Yanqing 445 MHz WPR( CFL-08) vertical beam detecting data from 2009 to 2011,after dealing wih the BS data,the echo intensity of raindrops ZRand the raindrops mean vertical velocity VRcan be obtained,and the least square fitting relationship between WTand ZRis described as WT=3.75H-0.085Z0.006H+0.066,this formula gives an effective method to estimate the air mean vertical velocity for the vertically pointing Doppler radar under rainfall condition.