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。 The three signal characteristic parameters such as skewness, kurtosis and mean square error were introduced to analyze the Doppler spectrum of a large number of precipitation echo signals acquired by weather radar. The preliminary results show that the Doppler spectrum of the precipitation echo signal is related to the spectral width of the echo. When the echo velocity spectrum width is more than 3.5 m / s, the Doppler spectrum of the precipitation echo signal deviates greatly from the Gaussian spectrum. When the echo velocity spectrum width is less than 3.5 m / s, the Doppler spectrum of precipitation echo signal is very close to the Gaussian spectrum.