| Citation: | ZHANG Hongshi, JIANG Bofeng. Spatial isolation methodology for spectral coexistence in LEO satellite systems[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(9): 1909-1917. doi: 10.13700/j.bh.1001-5965.2017.0732(in Chinese)
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The increase demand for global services in recent years has led to the deficiency of resources in traditional low frequency band in low earth orbit (LEO) satellite communication. Thus designs of LEO satellite constellation in Ka band have drawn a lot of interests. However, utilization of Ka band in LEO design inevitably causes interference to the existing geostationary (GEO) satellite system in the same band. A method of the discrimination angle based on spatial isolation in LEO-GEO coexistence systems is adopted to mitigate the interference both in uplink and downlink scenarios and to guarantee that the interference level from LEO system can meet the constraint requirements of communication interference in the same frequency band which are stipulated by International Telecommunication Union (ITU). Furthermore, a concept of GEO band is developed to determine the interference exclusion zone and to research the impact on the LEO satellite constellation density. Finally, simulations of the relationship among the discrimination angle, the GEO band and the LEO constellation density are given and the minimum satellite amount in this method without interrupting satellite services is found, which is significant in LEO satellite constellation design.
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