A GSO Protected Area Calculation Model based on Controllable NGSO System Parameters

According to ITU rules and recommendations, all NGSO systems must protect the GSO system from co-frequency harmful interference. However, the existing methods normally calculate the relative positions of satellites and earth stations through real-time data acquisition, and choose strategies such as satellite switching or isolation zone. As for the mega-constellations under construction, these methods still have great challenges to completely avoid harmful interference. In this circumstance, we establish a novel GSO protected area calculation model based on controllable NGSO system parameters. The proposed model not only has the advantages of low complexity and small calculation load, but also suitable for any NGSO constellation configuration as well as GSO earth station which located anywhere. The theoretical and simulation results both show that the harmful interference can be completely eliminated by setting the proposed GSO protected area. Furthermore, beams off and power control technologies are considered to lessen the protected area in a quantifiable degree, which is more achievable and more likely to be adopted by the existing NGSO systems.