卫星通信系统邻星干扰分析方法研究

Analysis Method Study of Satellite Communications System Adjacent Interference

针对多星组网频率复用卫星通信系统的邻星干扰问题,对一种卫星通信系统邻星干扰分析方法进行了研究。首先计算地面站能否同时接收到邻星信号,若无,则不存在邻星干扰,若有,则需分析干扰的影响。其次计算邻星是否在接收天线主波束范围内,若不是,可认为两星的极化方式对接收系统无影响;若是,考虑双星完全重叠的极限情况,分析最严重的邻星干扰,并给出了综合考虑天线、降雨、倾角、冰晶等因素导致的去极化效应的信噪比计算模型。该方法已成功用于我国某卫星星座通信系统设计并通过了在轨测试,误码率满足系统设计要求。研究可为我国其他多星组网频率复用卫星通信系统的研究和设计提供参考。

Aiming at the problem of adjacent interference of multi satellite communication system with frequency reuse,an analysis method of satellite communication system adjacent interference was studied in this paper.First the ground station could receive satellite signal or not is calculated.There is no adjacent interference if no.It needs to analyze the interference influence if yes.Then the satellite is in the range of the receiving antenna main lobe or not is calculated.The polarization of the two adjacent satellites has no effect on the ground receiving system if no.The limitation when the two satellites are overlap totally shall be in consideration if yes.And the major interference need to be analyzed.Finally the computation mode of signal noise rate is given when the cross polarization is caused by the factors of antenna,rainfall,inclination,ice and others.The method has been successfully applied to the design of a multi-satellite communication system of some satellite in China.The error rate test results meet the design requirements of the system.This method can provide reference for the research and design of China′s other multisatellite frequency reuse satellite communication system.