Research On Active Jamming Recognition And Efficient Implementation Of Missile Target Acquisition System

In the complex electromagnetic environment,the missile-borne target acquisition system,the missile-borne radar,suffers a variety of electronic jamming tactics in the course of its work,in particular long-distance support-type jamming,self-defense jamming and compound jamming.The missile radar echo signal will be affected by the active radar jamming generated by the jammer,causing the missile radar to fail to obtain the target information correctly.Active jamming consists of active suppression jamming and active deception jamming.In order to ensure the combat capability and survivability of missile-borne radars,active radar jamming recognition needs to be studied.This thesis analyzes the characteristics of missile-borne radar and the electromagnetic environment,and models the jamming scenarios of missile-borne radar.Combining the two concepts of electronic reconnaissance and missile-borne radar signal processing,the method of identifying the type of active jamming is studied through the difference between echo signals and jamming signals of missile-borne radar.This thesis studies the above problems in two aspects: algorithm theory and hardware implementation.The main contents are as follows:1.Introduce the work flow and work characteristics of missile-borne radar,analyze the electronic jamming tactics and jamming methods that missile-borne radar may encounter,and model the jamming scene of missile-borne radar.2.Analyze the differences in the active suppression interference bandwidth.Combing the electronic detection structure,this thesis propose a corresponding jamming type identification method.3.For distance-based active deception jamming,analyze the characteristics of jamming signals in time domain,frequency domain,pulse pressure ratio and arrival time(TOA),and study the corresponding jamming identification methods.Verify the effect of jamming recognition with simulation data.4.For speed-type active deception jamming,the detection problem of missile radar signals under low signal-to-noise ratio(SNR)or jammer ratio(JNR)is studied.Based on the difference between the amplitude of missile-borne radar echo and deception jamming,the algorithms for distinguishing between radar echo and jamming are studied.Based on active deception jamming slow-time domain information,deception jamming type recognition algorithms are studied.Combine simulation data to verify the research algorithm.5.The missile-borne radar active jamming identification hardware is designed and the communication modes between different parts are introduced.The analysis focuses on the high efficiency of algorithms based on 8-core DSP chips(TMS320C6678)to shorten processing time through multi-core scheduling.Finally,algorithms are tested on the hardware platform to verify the feasibility of the algorithm.