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

Tao Yue; Tang Dazhang; Xiao Wenan; Xia Wenmei

Vol.16, NO.2, 2005

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2005 > 16(2): 205-212

Tao Yue, Tang Dazhang, Xiao Wenan, et al. An improved method of extended velocity-azimuth display analysis to enhance accuracy of horizontal divergence. J Appl Meteor Sci, 2005, 16(2): 205-212.

Citation:

Tao Yue, Tang Dazhang, Xiao Wenan, et al. An improved method of extended velocity-azimuth display analysis to enhance accuracy of horizontal divergence. J Appl Meteor Sci, 2005, 16(2): 205-212.

Tao Yue, Tang Dazhang, Xiao Wenan, et al. An improved method of extended velocity-azimuth display analysis to enhance accuracy of horizontal divergence. J Appl Meteor Sci, 2005, 16(2): 205-212.

Citation:

Tao Yue, Tang Dazhang, Xiao Wenan, et al. An improved method of extended velocity-azimuth display analysis to enhance accuracy of horizontal divergence. J Appl Meteor Sci, 2005, 16(2): 205-212.

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

1.
Nanjing I nstitute of Meteorology, Nanjing 210044
2.
Jiangsu Provincial Meteorology Bureau, Nanjing 210008

Received Date: 2003-10-14
Rev Recd Date: 2004-10-24
Publish Date: 2005-04-30

Abstract

Abstract

?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 Matejke'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 v and SNR.
- EVAD method;
- Numerical simulation;
- Weighting function

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References(7)

Figures and Tables

图 1 径向速度V_r为11 m/s (即对应的多普勒频率f₀为120 Hz, 速度谱宽σ_v为2 m/ s) 时, 附加40 dB信噪比 (SNR=40 dB) 白噪声后的离散功率谱密度图 (其中Nyquist频率F_n=256 Hz)

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表 1 模拟含0, 1, 2, 3阶谐波的非线性风场的特征参量

表 2 不同SNR条件下, 3种EVAD算法的结果对比

表 3 不同谱宽条件下, 3种EVAD算法的结果对比

表 4 不同非连续性缺口的条件下, 3种EVAD算法的结果对比

表 5 缺口范围相同但位置不同的条件下, 3种EVAD算法的结果对比

References

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