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本文全面地总结了在武汉所进行的为期三年的12GHz地空降雨衰减实验研究。尤其是后两年用无源辐射计所进行的测量。在处理和分析这两年的降雨衰减实验数据中,利用辐射传输理论,考虑了雨滴散射和雨温随高度分布,研究了雨介质的特性并把它运用到计算地空降雨衰减中,给出了降雨衰减、最坏月分及相应降雨率的累积分布、持续时间和有效路径长度。文中还给出了具有较为普遍应用价值的降雨衰减预报模式。预报结果表明;预报值与实测值符合得相当好并优于CCIR的预报估算。
This article comprehensively summarizes the experimental study on the attenuation of 12GHz ground-based rainfall in Wuhan for three years. Especially after two years with passive radiometer measurements. Based on the theory of radiative transfer and considering the raindrops scattering and the distribution of rainfall temperature with height, the characteristics of rain media are studied and applied to the calculation of rainfall attenuation in the past two years. The cumulative distribution, duration and effective path length of the rainfall decay, the worst month, and the corresponding rainfall rate. The article also gives a more general application value of rainfall attenuation forecast model. The forecast result shows that the predicted value is in good agreement with the measured value and better than the forecast of CCIR.