NGSO互联网星座用户链路同频干扰分析

Cochannel Interference Analysis for User Link of NGSO Internet Constellation

针对未来非静止轨道(NGSO)互联网星座用户链路的灵活多波束发展趋势,梳理了用户链路的干扰场景与星地节点特点,并建立了面向多波束的同频干扰分析模型。该模型可支撑卫星在多色复用波束编排下地面大量终端的同频干扰分析。采用商用轨道建模软件与MATLAB级联,在实际系统间采用所提模型对载干噪比(CINR)、干噪比(INR)等主要评估指标进行了仿真计算。结果表明,非静止轨道互联网星座间具有多波束、多终端特点,使得同频干扰问题不可避免。研究结果能够有效指导中国卫星互联网星座工程的建设工作。

Based on the trend of flexible multi-beam for non-geostationary orbit(NGSO)In-ternet constellation user links,the interference scenes and the characteristics of satellite and earth nodes are summarized,and a multi-beam-oriented cochannel interference analysis model is established.The model can support the cochannel interference analysis of massive ground terminals under multi-color multiplexing beam arrangement.The com-mercial orbital modeling software and MATLAB were used to calculate the carrier to inter-ference plus noise ratio(CINR)and interference to noise ratio(INR)using the proposed model between two actual constellations.Results show that the cochannel interference is inevitable due to the multi-beam and multi-terminal characteristics of the non-geosta-tionary orbit Internet constellation.The research results of this paper can effectively guide the construction of satellite Internet constellation project in China.