Modeling And Spatial Electromagnetic Field Analysis Of Multivariate Vector Radiation Source Based On UAV Platform

In modern radar technology,the single-pulse radar is popular among military and scientific researchers at home and abroad due to its good anti-interference ability and accurate azimuth measurement technology.The effective interference modes for the single-pulse radar are multi-point source interference based on the"angular flicker"theory including"angular flicker"passive incoherent interference,cross-polarization interference,binary vector"cross-eye"interference,etc.,that create"angular flicker"phenomenon artificially by controlling the phase difference and amplitude ratio of the two-point source radiation field,thereby It causes the radar echo to be distorted and achieves the purpose of angle deception and interference.Based on the theory of"corner flicker",this thesis proposes a new interference technology-multivariate vector synthesis technology.The technology uses three coherent antenna sources to form a basic radiating element.By changing the amplitude and phase of different antennas to control the position of the equivalent scattering point on the plane,the synthetic wave of the antenna will produce different degrees of distortion,thus the single-pulse radar angle.Measurements are induced in different directions.It has better interference effect and practicability than the binary vector"cross-eye"structure.The thesis uses the Poynting vector principle to derive the mathematical model of the relationship between the equivalent scattering point position and the antenna feeding amplitude and phase,and obtains the azimuth and elevation angle of the equivalent scattering point relative to the radar observation point.This mathematical model is equally applicable to the calculation of the conventional binary vector"cross-eye".The paper combines the simulation results of MATLAB mathematical model with the analysis of FEKO electromagnetic simulation results to obtain the control law of equivalent scattering points.By studying the influence of different parameters on the equivalent scattering points,the configuration method of feeding parameters is simplified.The improvement and advantages of multivariate vector synthesis technology over"cross-eye"technology and corresponding conclusions are drawn:(1)the synthetic field of multivariate vector synthesis technology does have wavefront phase distortion phenomenon;(2)multivariate vector synthesis The equivalent scattering points can be distributed over 360 degrees;(3)Compared with the"cross-eye"structure,the triplet vector synthesis has a larger offset distance,a larger offset angle,and better parameter freedom.And the error tolerance rate has better interference effect on the single-pulse radar;(4)The research results show that the phaseβ_c of the antenna 3 can be fixed 0 orπ(either the phaseβ_a of the antennas 1,or the phaseβ_b of the antennas 2),thereby reducing the number of control parameters.In addition,the paper also analyzes the influence of the UAV on the electromagnetic field distribution and the equivalent scattering point synthesis after the multi-vector synthetic antenna is loaded onto the UAV platform,and the UAV airborne multi-vector antenna is analyzed.A preliminary study was carried out on the appropriate loading method to verify the achievability of the method for airborne interference.