Research On Modeling And Experiment Of Multivariate Vector Synthesis Interference Method Based On Platform Echo

Multivector synthesis jamming is a new effective jamming technique against monopulse radar.Based on the review and summary of the existing research results of the multi-vector synthesis jamming technology,this thesis studies the multi-vector synthesis jamming technology according to the requirements of airborne self-defense.The mathematical model of multi-vector synthesis interference of platform echo is considered,the theory of multi-vector synthesis interference method is improved,and the key problems of effective implementation of interference are studied,including jamming to signal ratio,parameter tolerance of amplitude and phase,the layout of antennas rotation angle of the platform and interference distance.Then electromagnetic interference simulation based on airborne platform and equivalent scaling experiment based on Xband experimental platform are carried out.The feasibility and effectiveness of multiple vector synthesis jamming technology applied to airborne platform are verified.Based on the angle measurement principle of specific amplitude monopulse radar and the vector synthesis principle of electromagnetic field,the mathematical models of multi-vector synthesis interference considering the platform echo are established respectively,and the same angle deception formulas are derived,which verifies the correctness of the derived results.Combining with the practical engineering application background,the jamming to signal ratio of the multi-vector synthesis interference system is defined,and the median formula of interference angle is derived.Based on the actual interference scene,the formula of path difference is derived.From the mathematical point of view and practical physical significance,this thesis analyzes the parameter index requirements that affect the jamming effect against monopulse radar,specifically studies the influence of parameter tolerance of amplitude-phase control,the layout of antennas,jamming signal ratio,interference distance and the radar cross section of the platform on the jamming effect,and puts forward reasonable suggestions for the design of practical multi-vector synthesis jamming system.Firstly,the electromagnetic simulation model based on the airborne platform is established in FEKO software.The simulation results show that the electromagnetic scattering characteristics of the airborne platform will affect the jamming effect.Secondly,a multivariate vector synthesis jamming system is designed and built based on the X-band experimental platform in the laboratory.The experimental results show that the multivariate vector synthesis jamming technology can cause interference effect in twodimensional space,and when the jamming signal ratio is no less than 20 d B,the angle deception effect of more than 4 times the maximum field angle of the platform can be achieved.The experimental results and mathematical analysis results confirm each other,which proves the feasibility and effectiveness of the multivector interference synthesis method.The above research content and results have great theoretical guiding significance and engineering application value for realizing the new electronic countermeasures technology for self-defense and defense requirements of airborne platform and other carrier platforms,and can provide theoretical support and index reference for the construction of practical multi-vector synthesis jamming system.