基于协作的大规模NGSO星座间频率兼容共存研究

针对大规模非静止轨道（NGSO）通信星座系统间的同频干扰问题，在综合分析传统干扰评价指标的相互转换关系的基础上，建立了基于链路夹角的干扰分析模型，将通信干扰约束转化为几何构型约束.通过卫星选择和链路组合选择定义了系统可用性指标，基于此，开展了基于协作的大规模NGSO星座间频率兼容共存研究，并给出了协作模式下NGSO星座的工作方式.仿真中，选取OneWeb和Telesat系统实际工作参数，评估了全球范围内系统的可用性.结果表明，非协作模式下系统平均可用性为72.82%，在27.18%的时间内系统之间将产生严重干扰，而协作模式下系统平均可用性为96.00%，协作模式将大幅提升NGSO星座系统之间的频率兼容性.

Research on Frequency Compatibility of Collaboration-Based Large-Scale NGSO Constellations

Aiming at the problem of co-frequency interference between large-scale non-geostationary orbit(NGSO)constellation systems, we established the interference analysis model of link angle to convert communication interference constraints into geometric configuration constraints based on the comprehensive analysis of the mutual conversion relationship of the traditional interference evaluation indicators. Furthermore, the system availability index is defined by satellite selection and link combination selection. On basis of this, we carry out some researches on frequency compatibility of collaboration-based large-scale NGSO constellations, in which the working mode of NGSO constellation in cooperation mode is given. In this simulation, the actual working parameters of OneWeb and Telesat systems are selected to evaluate the system availability on a global scale. The result illustrates that the average system availability in non-cooperative mode is 72.82% since the severe interference will occur between systems in 27.18% of the time, while the average system availability in cooperative mode is 96.00%, which means cooperation mode will greatly improve the compatibility of NGSO communication constellation systems.