基于数值天气预报预测电波雨衰的关键问题分析

随着Ka频段卫星通信产品的推广应用,降雨衰减在卫星通信系统中的影响越来越大。经典雨衰预测方法利用年固定时间百分比降雨率数据计算,在卫星通信系统设计中发挥了重要作用,但并不能用于天气对全网各节点的影响分析。随着气象科技的不断进步,小时降水量预报不断精细,使得在特定通信保障任务中评估预测各节点雨衰值成为可能。在充分介绍了经典雨衰模型ITU-R和数值天气预报的基础上,从降雨率换算、降雨率平均化、雨顶高度判定三个角度出发,提出了构建基于降水预报数据雨衰预报模型的关键问题,并指出了相关改进方法。

The key issues analysis of rain attenuation prediction based on numerical weather prediction

With the promotion and application of Ka-band satellite communications products, the influence of rain attenuation has been increasing on the satellite communication system. The rain attenuation of the fixed percentage of the time in a year is used in the prediction method of the classic rain attenuation, which plays an important role in the design of the satellite communication network, but it can not be used in the impact analysis of weather effects on satellite communication network. With the continuous improvement of meteorological science and technology, hour-precipitation forecast has become more and more precise, that makes it possible to forecast the rain attenuation of each node during a communication support task. Basis on introducing of the classic rain attenuation model ITU-R and numerical weather prediction, start from rain rate conversion, rain rate averaged, rain top height determination, the key issues of building rain attenuation model are proposed, and the relative improved methods are given out.