High and low orbit frequency spectrum sharing method based on formation satellite distributed beam forming

Abstract

The invention discloses a high-orbit and low-orbit frequency spectrum sharing method based on formation satellite distributed beam forming, which aims at a scene of frequency spectrum sharing between high-orbit and low-orbit satellite communication systems and considers that a GEO satellite communication system primary user and an LEO satellite communication system secondary user share the same frequency in an uplink. A novel frequency spectrum sharing method based on a formation satellite cooperative beam forming technology is provided, the interference problem in a high and low orbit satellite communication system frequency sharing scene is solved from an airspace angle by using a satellite cluster of low orbit formation flight, and the communication performance of a secondary user is ensured; by analyzing same-frequency interference when high and low orbit satellite systems coexist and adopting a self-adaptive beam forming method of a linear constraint minimum variance criterion, the receiving pattern direction of formation satellites is adjusted, so that the main lobe direction of a beam is aligned with a low orbit satellite user communicating with the beam, the null direction is aligned with a GEO ground station, the signal to interference and noise ratio of the low orbit satellite system is improved, and the signal to interference and noise ratio of the formation satellites is improved. And the same-frequency interference between the double satellite systems is relieved from the spatial domain dimension.

Description

technical field [0001] The invention relates to the technical field of satellite communication, and mainly relates to a high and low orbit frequency spectrum sharing method based on distributed beamforming of formation satellites. Background technique [0002] Currently, space network frequency resources are mainly uniformly divided by the International Telecommunication Union (ITU) according to service types and geographical regions. As countries pay more and more attention to the construction of spatial information networks, the golden frequency bands for mobile services such as L / S have already been carved 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 is already difficult to meet the growing service demand. Therefore, one of the problems that needs to be solved in the field of spatial information is to ex...

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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