改善EVAD技术求解散度的方法  

AN IMPROVED METHOD OF EXTENDED VELOCITY-AZIMUTH DISPLAY ANALYSIS TO ENHANCE ACCURACY OF HORIZONTAL DIVERGENCE

作　　者：陶玥[1] 汤达章[1] 肖稳安[1] 夏文梅[2] 

机构地区：[1]南京气象学院电子工程系,南京210044 [2]江苏省气象局,南京210008

出　　处：《应用气象学报》2005年第2期205-212,共8页Journal of Applied Meteorological Science

摘　　要：详细介绍了改善EVAD技术中测量水平散度的方法,用Sirmans建议的技术来模拟降水回波信号,通过此方法对模拟的含有0,1,2,3阶谐波的非线性风场加噪声,得到近于真实的多普勒速度场,并用此速度场得到的水平散度和以前的EVAD算法(Srivastava算法和Thomas算法)的水平散度相比较,结果表明无论在非全方位不均匀采样、非全方位均匀采样、不同信噪比、不同速度谱宽条件下,文章建议的EVAD方法求得的水平散度精度有明显的提高。The method that have improvements to the previously reported EVAD technique to obtain horizontal divergence are discussed in detail. Sirmans' method of radar simulated precipitation signal is applicable to the nonlinear wind field including the three harmonic, and a Doppler velocity field is obtained that is approximated to the real velocity field. The improved EVAD method, Srivastava's and Matejka's EVAD methods are applicable to this simulated Doppler velocity field, and three methods are compared. Computing results indicate that the accuracy of horizontal divergence is obtained by the improved EVAD method is enhanced at not full azimuth wind field, at different σ_v and SNR.

关 键 词：VAD技术 水平散度 求解 多普勒速度场 均匀采样 VAD算法 详细介绍 回波信号 模拟降水 速度谱宽 全方位 非线性 a算法 信噪比 风场 

分 类 号：P425[天文地球—大气科学及气象学]