引入偏斜度、峰度、均方差等三个信号特征参数,对天气雷达获取的大量降水回波信号的多普勒频谱进行分析。初步研究结果显示:降水回波信号的多普勒频谱分布与回波谱宽大小有关,当回波速度谱宽大于3. 5 m/ s 时,降水回波信号多普勒频谱与高斯谱偏差较大;当回波速度谱宽小于3. 5 m/ s 时,降水回波信号多普勒频谱与高斯谱非常接近。

Aiming at analyzing a large number of Doppler spectra of real precipitation signal, introduce three signal feature parameters, including of skewness, kurtosis, and mean square error, the result indicated: the precipitation signal Doppler spectral shape is associated with echo spectrum width, when the velocity spectrum width is more than 3. 5 m/ s, the Doppler spectra shape is not

TN959. 4