降雨对微波传输特性的影响分析

在归一化雨滴谱分布、雨滴的介电模型和Mie散射理论的基础上计算群雨滴在微波波段的散射和衰减特性，讨论分析雨滴谱分布、降雨强度、入射波频率和温度等因素对微波传输特性的影响.数值模拟结果表明，不同谱分布的群雨滴散射能力从大到小依次为JD，MP，Gamma和JT分布，降雨强度对微波传输特性的影响最大，入射波频率次之，温度的影响最小.所得出的结论有助于准确评估降雨对微波传输的影响以及提高利用测雨雷达和毫米波雷达等定量探测降水的精度. 关键词： 微波传输 雨滴谱分布 Mie散射 散射衰减特性

Effects analysis of rainfall on microwave transmission characteristics

Based on the normalized raindrops size distribution,dielectric model of raindrop and Mie scattering theory,the scattering characteristic of raindrop cluster in the microwave and millimeter domain are calculated,the effect of raindrop size distribution,rain-rate,incidence wave frequency and temperature on the microwave transmission are discussed. The results show that the scattering capabilities of raindrop clusters decrease in the order of JD,MP,G amma and JD. The effect of rain-rate on microwave transmissi...