Co-Frequency Interference Analysis Between Large-Scale NGSO Constellations and GSO Systems

With the number of multi-beam satellites in the non-geostationary orbit (NGSO) constellations increases by hundreds to thousands, the interference between geostationary orbit (GSO) satellite systems and NGSO constellations changes dynamically, and interference analysis will become very complicated. To address this problem, a dual-step interference analysis method based on space-discrete is proposed in this paper. Specifically, we discretizes the spatial positions of the reference NGSO satellite by dividing the latitude and longitude grids, and obtain the probability density function of the reference NGSO satellite. We analyze the aggregate interference caused by NGSO constellations to GSO systems, respectively, both in the uplink and downlink on the basis of interference-to-noise-ratio (I/N) and interference probability. The results show that there is severe interference between the NGSO and GSO systems and the aggregate interference level is affected by the locations of GSO earth station. Especially in the equatorial region, the interference is most serious. Furthermore, compared with commercial software Visualyse Professional, the proposed method can greatly improve the simulation efficiency while ensuring the accuracy.