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首页> 外文期刊>International Journal of Infrared and Millimeter Waves >Rain attenuation ratios on short microwave and millimeter wave bands earth-space paths
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Rain attenuation ratios on short microwave and millimeter wave bands earth-space paths

机译：短微波和毫米波波段地球-空间路径上的降雨衰减率

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摘要

The knowledge of the ratio of rain attenuation at one frequency to that at another on slant paths is useful for the design of satellite-to-Earth communication links and up-link power control system. It is well known that the rain attentuation is influenced by parameters of precipitation along the slant path such as DSD (raindrop size distribution), raindrop temperature, rainfall rate, and so on. In this paper, based on several DSDs applied to various climate zones, at short microwave and long millimeter wave bands, the attenuation ratios are estimated on Earth-space paths. A comparison of the prediction results with the experiment data in Boston and Kashima areas is carried out. It is shown that the M-P and Weibull DSD applied to rain attenuation ratios estimation are better DSD at higher latitude regions. The Guangzhou DSD applied to rain attenuation ratios prediction is better in tropical and subtropical areas in China. The lognormal DSD may be a apropriate DSD applied to predict rain attenuation ratios in tropical areas at A_(down) > 1dB or R > 15mm/h. However, the attenuation ratios predicted by the Guangzhou DSD disagree with by the lognormal DSD, it requires that the DSD applied to predict rain attentuation ratios are further studied in tropical areas.
机译：倾斜路径上一个频率与另一个频率上的雨衰比的知识对于设计卫星到地球的通信链路和上行链路功率控制系统很有用。众所周知，降雨的衰减受沿倾斜路径的降水参数（例如DSD（雨滴大小分布），雨滴温度，降雨率等）的影响。在本文中，基于应用于多个气候区的几个DSD，在短微波和长毫米波段，估算了地球-空间路径上的衰减比。将预测结果与波士顿和鹿岛地区的实验数据进行了比较。结果表明，在高纬度地区，M-P和Weibull DSD应用于降雨衰减率估计是更好的DSD。在中国的热带和亚热带地区，广州DSD应用于降雨衰减率的预测更好。对数正态DSD可以是适当的DSD，用于预测A_（down）> 1dB或R> 15mm / h时热带地区的降雨衰减率。然而，广州DSD预测的衰减率与对数正态DSD不一致，这就要求在热带地区进一步研究用于预测降雨衰减率的DSD。

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