Research On The Theory And Method Of Monopulse Radar Cross Polarization Angle Deception Jamming

The monopulse measurement radars,which have high measurement accuracy,short response time and strong anti-interference ability,are widely used in today's radar tracking systems,which is of great military significance to conduct in-depth research on confrontation.This thesis focuses on the monopulse measurement radar,starting with the cross-polarization deception jamming perspective.Based on the deep analysis of the working principle of monopulse radar,the radar signal polarization detection,signal polarization state parameter estimation and the principle of cross-polarization jamming and its effect analysis are mainly studied.The main research content is divided into three parts:1.The working principle of the monopulse radar is analyzed.According to the principle difference,there are amplitude differential and phase differential monopulse radars.At present,there are three common interference modes for monopulse radar's operating characteristics: non-coherent interference,coherent interference and crosspolarization interference.Compared with the other two interference modes,crosspolarization interference does not require multiple spatially separated interference sources,and it can effectively induce monopulse radar angle measurement,which is the main research content of this thesis.2.The basic theory of the polarization is introduced and the commonly used polarization characterization method is given.With the continuous deepening of polarization research,it has attracted increasing attention from the perspective of polarization to solve common signal problems.A simple analysis of radar polarization measurement methods is made.The methods can be mainly divided into time-division polarization measurement systems and simultaneous polarization measurement systems.For the simultaneous polarization measurement system,the dual-frequency vector pulse method and positive-negative linear frequency modulation method are used for theoretical analysis and experimental simulation,which obtain relatively accurate polarization measurements.3.The monopulse radar cross-polarization angle deception jamming method is deeply analyzed.Firstly,the signal polarization state parameter estimation methods are theoretically deduced and experimentally simulated.The accuracy of the polarization state estimation is directly related to the generation of subsequent cross-polarization interference signals,and is an important part of the interference implementation process.Then The basic principle of monopulse radar cross-polarization angle deception jamming is analyzed,and the factors that influence the jamming effect are modeled and analyzed.In order to implement effective cross-polarization interference,it is necessary that the interference signal be polarized as orthogonally as possible to the target signal,and the interference power should be as large as possible.When the interference signal is transmitted,amplitude-phase weighting may be performed on the orthogonal polarization channels respectively so as to realize the orthogonality between the interference signal and the target polarization.Finally,the factors that affect the cross-polarization angle deception jamming and the problems that should be paid attention to during the implementation are briefly discussed.This thesis mainly uses the combination of theoretical derivation and experimental simulation to deeply analyze the working principle of monopulse radar and the principle of cross-polarization interference and draws certain research results.