This letter proposes a novel interference mitigation technique for spectral coexistence between large-scale non-geostationary orbit (NGSO) satellite systems by optimizing satellite antenna beam pointing. Firstly, a dynamic exclusion zone of NGSO satellite antenna beam pointing is defined. Secondly, we transfer frequency compatibility problem between NGSO systems into a constrained nonlinear multivariate optimization problem considering the joint effect of link distances as well as angles between links and solve it using Genetic Algorithm (GA). Then we select actual working parameters of Starlink and OneWeb satellite systems to verify the effectiveness of proposed interference mitigation technique in the worldwide. The available time of the interfered system is up to 98.5% of total simulation run time after interference mitigation. The results show that the proposed interference mitigation technique can effectively mitigate the interference between NGSO satellite systems and guarantee signal to interference plus noise ratio (SINR) at the interfered earth station.

中文翻译：

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基于波束指向优化的NGSO卫星系统间下行干扰抑制技术

这封信提出了一种通过优化卫星天线波束指向来实现大规模非对地静止轨道 (NGSO) 卫星系统之间频谱共存的新型干扰缓解技术。首先，定义了NGSO卫星天线波束指向的动态禁区。其次，考虑链路距离和链路间角度的共同影响，我们将 NGSO 系统之间的频率兼容性问题转化为受约束的非线性多元优化问题，并使用遗传算法 (GA) 对其进行求解。然后我们选取 Starlink 和 OneWeb 卫星系统的实际工作参数来验证所提出的干扰缓解技术在全球范围内的有效性。干扰消除后，受干扰系统的可用时间高达总仿真运行时间的 98.5%。