Research On Cooperative Beamforming Technology Based On Distributed Formation Satellites Array

Faced with the global coverage requirements of 5G wireless mobile communication networks,satellite communications have become one of the key technologies in 5G mobile communication networks,and higher requirements have been placed on the communication capacity and transmission performance of satellite links.Compared with the wireless communication link of the ground cell system,the satellite communication link has the characteristic of large attenuation of the electromagnetic wave signal due to long-distance transmission.And the satellite is a resourceconstrained platform.The total power of the communication transponder and the size of the antenna are both limited by the cost and risk of a single satellite.How to improve the satellite platform's ability to send and receive the wireless electromagnetic signal has become one of the research directions of space information network.Distributed formation satellites are multiple satellites in the same orbit or adjacent orbits in loworbit satellites.The formation of distributed satellite resources is integrated by satellite formation flying.Service enhancement is achieved through key technologies such as high-speed interconnection between satellites,distributed autonomous coordination,and resource virtualization.Distributed formation satellites are an important technology for building a stable and reliable space information network in the future.The use of multiple low-orbit satellites in the form of satellites,coordinated transmission and reception to enhance the ability of low-orbit small satellites to send and receive electromagnetic signals is the starting point of this study.In order to solve the problem that a single low-orbit small satellite has weak ability to send and receive electromagnetic wave signals,a distributed formation satellites cooperative beamforming algorithm based on random antenna array theory is proposed in this paper.The average pattern function of distributed formation satellite collaborative transmission is derived under satellite perturbation conditions.On this basis,the distributed formation satellite electromagnetic transceiver task is used as the driver to establish the corresponding optimization problem,and the desired pattern function is obtained by convex optimization.Besides,the relationship between the instantaneous power pattern and the average power pattern and the influence of key parameters are analyzed,and the influence of the phase offset caused by phase noise of the local oscillator on the beamforming performance is further analyzed.The results show that the phase noise of the local oscillator will cause the degradation of the beampattern of the system.Finally,this article also uses STK and MATLAB to build the STK and MATLAB cross-simulation platform through the STK and MATLAB interconnect ports,to further demonstrate the distributed and cooperative beamforming technology in the satellite formation scenario of this article.The simulation results show that the proposed method in this paper extends the distributed and collaborative beamforming technology to the research field of space information network and enhances the electromagnetic wave transceiver capability of resource-constrained satellite systems.