非静止轨道星座系统级干扰评估研究

Study on system-level interference evaluation of non-geostationary satellite constellation

非静止轨道(non-geostationary orbit,NGSO)星座系统间频率干扰分析通常采用链路级指标判断有害干扰,但难以评价多链路星座系统整体受干扰程度。针对此问题,设计了系统级容量损失指标评估星座系统间同频干扰程度,并对混合构型NGSO星座系统间容量损失概率分布进行了建模仿真。在典型星座共存场景下,若大规模星座主动采取空间隔离干扰规避措施,最大系统容量损失将从35%降低为0;若小规模星座主动采取相同规避措施,最大系统容量损失将从78%恶化为100%。结果表明,随着星座规模增大,主动规避措施可有效缓解频率干扰带来的容量损失,反之当星座规模减小,主动规避措施会增加链路中断风险,造成系统容量恶化。最后,针对性提出了适用于不同规模星座的干扰规避策略建议。

The co-frequency interference analysis between NGSO(non-geostationary orbit)constellation systems usually used link-level interference evaluation indicators to judge harmful interference,but for constellation systems with multiple links,single-link-level indicators could not fully reflect the interference of the entire system.To solve this problem,a system-level capacity loss index was designed to evaluate the co-channel interference between constellation systems,and the probability distribution of capacity loss between hybrid configuration NGSO constellation systems was modeled and simulated.In the coexistence scenario of typical constellations,if the large constellations actively take interference avoidance measures based on space separation,the maximum system capacity loss would be reduced from 35%to 0.If small constellations take active interference avoidance measures,the maximum system capacity loss would deteriorate from 78%to 100%.The results show that,with the increase of the constellation scale,active avoidance measures can effectively mitigate the capacity loss caused by frequency interference;when the scale of constellation decreases,active avoidance measures will increase the risk of link interruption and cause system capacity deterioration.Finally,suggestions for interference avoidance strategies are proposed for constellations of different scales.