基于空间位置概率的NGSO通信星座干扰仿真分析研究  

Interference analysis simulation method based on spatial position probability for NGSO communication constellation system

作　　者：李伟[1] 魏文康 刘畅[1] 刘珊杉[1] 武秀广[1] LI Wei;WEI Wenkang;LIU Chang;LIU Shanshan;WU Xiuguang(State Radio Monitoring Center,Beijing 100037,China)

机构地区：[1]国家无线电监测中心,北京100037

出　　处：《电波科学学报》2021年第3期483-490,共8页Chinese Journal of Radio Science

基　　金：国家重点研发计划(2020YFB1806100);国家自然科学基金(91738101)。

摘　　要：针对非静止轨道(non-geostationary orbit,NGSO)通信星座系统与静止轨道(geostationary orbit,GSO)卫星系统同频干扰问题,建立了面向多波束NGSO通信星座系统的集总干扰分析模型,根据国际电联的相关建议和报告,提出了基于空间位置概率的双精度分析方法.通过对NGSO参考卫星进行空间采样,得出干扰的统计分布规律.以OneWeb和SINOSAT-5系统为仿真场景,评估了两系统间的干扰情况,并与国际通用工具对比验证了所提方法的正确性.在此基础上探究了精细步长仿真准则和地球站位置对结果的影响.结果表明,对于大规模NGSO通信星座系统,分隔角小于等于精细步长区域夹角的NGSO卫星数占比门限为20%时能够兼顾结果精度和计算效率,干扰分布趋势与GSO地球站纬度密切相关.Aiming at the problem of co-frequency interference between non-geostationary orbit(NGSO)constellation system and geostationary orbit(GSO)satellite system,aggregated interference analysis model for NGSO multi-beam constellation system is established,and the dual step algorithm of spatial position probability is proposed for interference analysis simulation based on relevant ITU recommendations and reports.This method discretizes the spatial position of NGSO reference satellite by dividing the latitude and longitude grid.Then the probability density function of interference-to-noise ratio(I/N)can be obtained.Taking OneWeb and SINOSAT-5 system as the typical NGSO constellation system and GSO satellite system respectively,the interference analysis is performed by using the proposed method,and the results are verified with International common tool.The results illustrate that when the threshold of the number of NGSO satellites whose separation angle is not more than the included angle of the fine step size region is 20%,both the result accuracy and calculation efficiency can be balanced.The I/N distribution is related to the latitude of the ground station.

关 键 词：非静止轨道(NGSO)通信星座系统 静止轨道(GSO)卫星系统 同频干扰 干扰分析 空间位置概率 

分 类 号：TN927[电子电信—通信与信息系统]