非静止轨道通信卫星星座间同频干扰概率分析

随着全球非静止轨道（non-geostationary orbit，NGSO）通信星座系统的大规模部署及应用，使用相同频率的星座系统之间存在着相互干扰的风险。NGSO系统间同频干扰概率的有效评估方法及合理评价指标是评估干扰风险及设计规避策略的基础，通过分析星座构型与地面站可视空域内卫星出现概率分布特性的关系，利用地面站接收端干扰噪声比保护阈值，建立了概率评估参数指标，并以OneWeb系统、O3b系统以及SpaceX系统为例，分析了全球范围地面站不同NGSO系统间发生有害干扰的概率分布特性。当系统间卫星出现概率分布趋同，会使有害干扰概率增加；反之，不同NGSO系统卫星在可视空域出现概率分布的较大差异会有效降低有害干扰概率。

Probabilistic analysis of co-frequency interference between non-geostationary satellite systems

With the deployment and application of mega non-geostationary orbit (NGSO) systems around the world, there is a risk of mutual interference between different NGSO systems. Probabilistic analysis of co-frequency interference between NGSO systems with effective methods and reasonable specifications is the basis of the interference and countermeasure design. In this work, the analysis of the relationship between NGSO system configuration and satellite appearance probability distribution in the field of view is presented. Based on the protection threshold of interference-noise ratio at the receiver of the ground station, the evaluation characteristics are established. Taking OneWeb system, O3b system and SpaceX system as examples, the probability distribution characteristics of harmful interference occurring between different NGSO systems are analyzed. The probability of harmful interference increases when the probability distribution of satellite occurrence is similar between systems, whereas the probability distribution of harmful interference is mitigated effectively when the probability distribution of satellite occurrence of NGSO systems is notably different in the field of view of ground stations.