Method for evading co-channel interference through deflection antenna pointing and satellite communication system

Abstract

The invention relates to a method for evading co-channel interference through deflection antenna pointing and a satellite communication system. The method comprises the following steps: arranging morethan one space-borne antenna on an NGEO communication satellite; determining a constellation configuration of the NGEO satellite communication system, and ground user type and distribution, and selecting variables to describe the normal orientation of the space-borne antenna of the NGEO satellite communication system; according to an interference protection regulation for the GEO satellite systemof ITU, selecting a group of indexes alpha for balancing the interference degree of the satellite communication system to the GEO satellite system; determining a group of indexes beta for balancing link quality of the satellite communication system; establishing a nonlinear optimization model of the normal orientation of the phased array antenna according to the indexes alpha and the indexes beta; and solving optimal variables through iterations and outputting a set of optimal phased array antenna deflection pointing setting scheme. The method for evading co-channel interference through deflection antenna pointing and the satellite communication system in the present invention ensure own communication link quality and reliability requirements, so that the satellite system can coexist effectively with the GEO satellite system at the same frequency.

Description

technical field [0001] The invention relates to the technical field of aerospace engineering communication, in particular to a method and a satellite communication system for avoiding co-frequency interference by deflecting antenna pointing. Background technique [0002] In recent years, emerging commercial aerospace companies represented by SpaceX and OneWeb have proposed building low-orbit constellations to provide Internet access services for the world, and stepped up their deployment to seize development opportunities. A wave of satellite Internet development driven by technological innovation and commercial capital is on the way. ravage the world. As an important organization of the United Nations responsible for managing global spectrum resources and orbital resources, the International Telecommunication Union (ITU) implements the "first come, first served" principle for frequency applications, and the system that applies later needs to propose frequency coordination t...

AI Technical Summary

Problems solved by technology

This method can achieve the effect of avoiding the same frequency interference to the GEO satellite system, but it will cause the earth stations in the middle and low latitudes to access the low-elevation satellites, and the carrier-to-noise ratio of the entire communication system will be seriously affected

Taking the 1200km orbital height of the OneWeb constellation as an example, after adopting this technology, the satellite-to-earth link may increase by 3 times at the farthest, and the corresponding carrier-to-noise ratio drops by more than 9dB

Moreover, each orbit of the satellite needs to repeatedly adjust the antenna pointing in the low-latitude regions of north and south latitudes. For low-orbit satellites, an orbital period is tens of minutes. high challenge

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