Research On The Cognitive Anti-jamming Technology Of Radar Radio Frequency-screen

As a kind of anti-jamming method that fully demonstrates the advantages of radar's active behavior.Radio frequency-screen has the characteristics of simple realization and excellent anti-jamming performance.With the development of electronic warfare,the complexity of radar jamming environment and the intelligentization of jamming equipment have brought enormous challenges to the radio frequency-screen.Because of its good flexibility and intelligence,cognitive technology has been widely used in modern radar and electronic warfare systems.This thesis aims at the technical characteristics of radar countermeasure at the current stage.The radio frequency-screen is taken as the research object.The theoretical research and simulation analysis methods are used.Based on radar active jamming guidance technology,the criteria and principles of anti-jamming in radio frequency-screen of radar are studied.In order to improve the effectiveness and intelligence of existing radar radio frequency-screen anti-jamming,the cognitive technology is introduced into the radar radio frequency-screen,and the anti-jamming after introducing cognitive technology are discussed.The main contributions are as follows: 1.The radar jamming and active jamming guidance technology are analyzed.Firstly,the components of radar jamming system and functions of each module are analyzed.Secondly,the principle of guidance in the time,frequency,spatial,and polarization domains of jamming is discussed.Finally,the theory of radar suppression jamming and deceive jamming is discussed.The simulation of radar typical active jamming is carried out.2.The radar RF Screening technology is analyzed.Firstly,the traditional radar radio frequency-screen system model is researched.The function and principle of each module is discussed.Secondly,based on the guiding principle of radar active jamming in time domain,frequency domain,spatial domain,and polarization domain.A radio frequency-screen principle diagram is constructed,and the time-frequency anti-jamming criteria and mathematical model for radar radio frequency protection are proposed.Finally,using the rules of evaluation on effects of radar anti-jamming and the interference ront-end intercept probability model,the anti-jamming effect of radio frequency-screen is analyzed.3.Radar radio frequency-screen and anti-jamming after introducing cognitive technology are discussed.Firstly,the basic concepts of cognition is studied.The radar radio frequencyscreen anti-jamming system model is discussed by introducing cognition.The function and working principle of each system module are analyzed.Secondly,the cognition block diagram of radio frequency-screen is given.The cognition techniques of radio frequencyscreen is discussed.The frequency domain jamming cognition based on digital channelization of poly-phase filter is emphasized.Finally,based on the dynamic game characteristics of cognitive anti-jamming,a time-frequency domain cognitive anti-jamming scheduling strategy for radar radio frequency-screen is proposed in the design.The antijamming effect of radar radio frequency-screen is evaluated.