天气雷达I/Q信号仿真建模及统计验证

The Simulation Model and Statistical Validation of I/Q Signal for Weather Radar

基于天气雷达发射脉冲的时间自相关特性,采用大气分层模型,建立天气雷达发射端到接收端的I/Q信号仿真算法;并通过统计分析,对算法可靠性进行验证。研究结果表明仿真得到的I/Q信号均符合高斯随机分布,回波功率符合指数分布,与天气雷达真实回波信号统计特性一致;同时以南京大学的C波段双偏振天气雷达的真实弱降水回波数据为基础,进行仿真回波数据与真实数据对比分析。统计结果表明相似的参数设定下,仿真回波信号的反射率因子和速度的标准差与真实信号的统计特性基本一致;且与理论公式结果基本吻合。

Based on the time autocorrelation characteristics of weather radar, the end to end I /Q signal simula-tion algorithm is established using the feuilleter model. Statistical characteristic is analyzed to verify the reliability of the algorithm. The results show that simulated I /Q signals follow the gauss random distribution, and Echo Power obey exponential distribution, which are consistent with the statistical characteristics of the real weather radar echo signal. By using the weak precipitation data of Nanjing University^ C-band dual polarization weather radar, simula-tion signal and real signals are comparative analyzed, statistical results showed that under similar parameter set-tings ,the statistical properties of standard deviation of reflectivity factor and speed between simulation and real sig-nals are basically the same, and are basically consistent with the theoretical formula.