Research On Distributed Radar Cooperative Anti-Jamming And Target Angle Estimation Algorithm

In modern war,information war has become the most important role.In the field of information war,the attack and defense of radar system become the key factors to determine the war situation.Among them,the application and suppression of jamming is a common behavior in radar attack and defense.Due to the existence of active jamming,the detection and location of targets by traditional radar is greatly troubled.In active jamming,the existence of deception jamming and suppression jamming puts forward higher requirements for the anti-jamming performance of radar.For the traditional single station radar,its coverage area is small,and the way of receiving signal is very single.In many cases,it can not deal with the problem of target detection and location caused by interference.The distributed structure radar system studied in this paper can form a kind of all-round,multi coverage and rich level combat system,which is the focus of domestic and foreign scholars at present.This paper focuses on the common active jamming,based on the distributed radar system,to study the jamming suppression method.The main work and contributions of this paper are as follows:1.The principle of distributed structure radar system is summarized.It includes the principle of transmitting and receiving signals,the advantages compared with the traditional single radar.The characteristics of common active suppression jamming and active deception jamming are analyzed there and introduced the method and performance of active jamming suppression.2.This paper introduces the principle of beamforming algorithm based on the receiver equivalent transmission.And in the background of distributed structure radar system,an interference suppression method based on the equivalent transmit beamforming of radar receiver is proposed.Besides,The influence of the jamming size and the number of receiving radars on the jamming suppression performance is analyzed.3.The interference suppression characteristics of the frequency diversity array(FDA,Frequency Diverse Array)in the distributed structure radar system are studied,including its transmitting and receiving principles,the suppression principles and characteristics for deception interference.This paper proposes a deception interference suppression method based on distributed FDA.Through simulation,the above problems are verified one by one.4.Combined with the distributed radar platform,a method of multi main lobe interference suppression based on blind source separation is proposed,and the target angle estimation method after interference suppression is studied.Different from the traditional main lobe interference suppression algorithm,this method relies on less prior information.The simulation results show that this method can be successfully applied to the scene of joint angle estimation of distributed radar platform under the background of multi main lobe interference.