摘要
在Ka及以上高频段卫星通信系统中,其链路信号的衰减很严重,主要是大气、降雨、闪烁对卫星信道的影响。本文主要研究了雨衰和对流层闪烁产生衰减的机理与特性,提出雨衰采用DAH模型,闪烁采用Van de Kamp模型。然后根据实测气象数据,计算我国各参考站点的雨衰和闪烁值。为抗衰减对策的提出提供理论依据,为工程设计提供具体的参考数据。
In Ka - band and above ka - band satellite communications, channel attenuation is badly effected by atmosphere, cloud and mist, rain and scinhillation mainly. The mechanism and characteristic of rain fade and scintillation are studied. The DAH mode is recommended as rain fade prediction model and Van de Kamp mode as scintillation prediction model in Ka - band satellite communications. Rain fade and scintillation values of different cities in China are computed based on real atmosphere data. Therefore, this paper can provide theoretic basis for fade countermeasure techniques and specific reference values for project designs of satellite communications channel.
出处
《电讯技术》
2005年第5期23-27,共5页
Telecommunication Engineering
基金
总装国防科技重点实验室基金资助项目(00JS63.4.1.JB3203)
关键词
卫星通信
卫星信道
衰减特性
雨衰模型
闪烁模型
抗衰减
Satellite Communication
Satellite channel
Attenuation characteristics
Rain fade modes
Scintillation modes
Fade countermeasure
