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.
出处
《应用气象学报》
CSCD
北大核心
2005年第2期205-212,共8页
Journal of Applied Meteorological Science
