A high and low orbit spectrum sharing method based on distributed beamforming of formation satellites

Abstract

The invention discloses a high and low orbit spectrum sharing method based on distributed beamforming of formation satellites, aiming at the spectrum sharing scene between high and low orbit satellite communication systems, considering the primary user of the GEO satellite communication system and the secondary user of the LEO satellite communication system in the uplink A new spectrum sharing method based on formation satellite cooperative beamforming technology is proposed, which uses low-orbit formation-flying satellite clusters to solve the interference problem in the frequency sharing scenario of high and low-orbit satellite communication systems from the perspective of airspace, so as to ensure that secondary users share the same frequency. The communication performance of high-level users; by analyzing the co-channel interference when the high and low orbit satellite systems coexist, the adaptive beamforming method with the linear constraint minimum variance criterion is used to adjust the receiving pattern of the formation satellites, so that the main lobe direction of the beam is aligned to communicate with it. The users of low-orbit satellites in the low-orbit satellite system should aim at the GEO ground station in the zero-sag direction, thereby improving the signal-to-interference-noise ratio of the low-orbit satellite system and alleviating the co-channel interference between the dual satellite systems from the airspace dimension.

Description

technical field [0001] The invention relates to the technical field of satellite communication, and mainly relates to a high and low orbit spectrum sharing method based on distributed beamforming of formation satellites. Background technique [0002] At present, the frequency resources of the space network are mainly divided uniformly by the International Telecommunication Union (International Telecommunication Union, ITU) according to service types and geographical areas. As countries pay more and more attention to the construction of spatial information networks, the prime frequency bands for mobile services such as L / S have long been divided up, and the frequency bands for fixed broadband services such as Ku / Ka are about to be exhausted, and the available frequency resources are very tight. The traditional, static and single frequency allocation method has been unable to meet the increasing service demand. Therefore, one of the urgent problems to be solved in the current ...

AI Technical Summary

Problems solved by technology

However, when using adaptive power control technology, in order to ensure that the primary user can work normally, it is necessary to sacrifice the performance of the secondary user, which inevitably leads to a decline in the spectral efficiency of the secondary user.

Low-orbit satellites are resource-constrained systems. Satellite power resources and antenna resources are constrained by satellite volume and manufacturing and launch costs. It is difficult to carry complex digital phased array antenna systems.

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