Distributed Inference Beamforming Based On Finite Feedback

Distributed beamforming technology has wide application prospects in the field of electronic warfare such as using unmanned equipment to jam enemies.For distributed jamming beamforming technology,it is difficult to synthesize waveforms coherently because of the independence of beamforming devices.In this paper,a node is used to receive the transmitted waveforms and transmit the power change as feedback information to the distributed transmitting nodes to achieve the goal of beamforming.Based on the above analysis,the work arrangement of this paper is as follows:Firstly,a model of multi-UAV ECM system the problems and difficulties in the model was established in this paper,and introduces.Then,the key technologies of distributed jamming beamforming are analyzed.The key technologies including information sharing among multiple devices,time synchronization of transmitted signals,frequency synchronization and phase synchronization are introduced in detail in this paper.At the same time,the corresponding solutions for the above technologies are given.Finally,based on the geometric model proposed in this paper,the beam pattern characteristics of the signal are analyzed,and the beam pattern of UAV under different array is introduced.Then,the problem of signal phase synchronization in distributed interference beamforming is discussed.Firstly,the corresponding mathematical model is established,and then three phase synchronization algorithms using finite feedback are applied to the distributed jamming beamforming problem.Firstly,the classical single-bit feedback algorithm is proposed,and the principle and feasibility of the algorithm are analyzed.Then,based on the classical single-bit feedback algorithm,two improved algorithms are proposed: the singlebit feedback algorithm based on phase perturbation reduction and the variable step direction perturbation single-bit feedback algorithm.Finally,three algorithms are simulated and analyzed by ECM system,and the applicability of the algorithms is analyzed in this paper.The beamforming effect of the two improved algorithms under specific parameters is mainly analyzed.Finally,the distributed jamming beamforming problem with time-varying frequency is discussed.Firstly,we give the reason of frequency time-varying,and establishes the corresponding mathematical model in this paper.Then,three interference beamforming algorithms based on finite feedback are applied to analyze the problem under the condition of time-varying frequency,and the principles and processes of the three algorithms are analyzed.Three algorithms mentioned in this paper are time-varying channel simulation algorithm,state monitoring two-bit feedback algorithm and signal monitoring two-bit feedback algorithm.Finally,three algorithms are simulated and analyzed by using electronic countermeasure system.At the same time,the applicability of the algorithms in this paper is analyzed.At the same time,the beamforming effect of the two improved algorithms under specific parameters is analyzed.