Study On Anti-jamming Technology Of Polarization MIMO Radar Based On Game Theory

In recent years,with the overall development of information technology,electronic intelligence and other technologies have made rapid development.At the same time,radar is facing more and more complex electromagnetic environment and more serious interference problems in modern electronic warfare.In the background of interference,traditional radar combat effectiveness is difficult to exert and it is easy to be restricted and targeted because of its principled characteristics.Deceptive interference based on digital radio frequency memory(DRFM)technology has become a serious threat to the modern radars.Therefore,radar anti-jamming is of great significance.Polarization radar,as a new type of radar system,has unique advantages in resisting forwarding interference.It mainly uses the difference between the target and interference in the polarization domain to identify true and false targets and suppress false targets.The generation of the adaptive jamming system makes the jammers more intelligent.The jammers and the radar play each other.The problem that the radar uses game theory to counter the jammers is worthy of further analysis and research.In response to the above problems,this paper focuses on the problem of antispoofing interference of co-located multiple-input multiple-output(MIMO)radar.Through the rational use of polarization diversity technology and game theory methods,it further taps the potential of MIMO radar and improves its anti-jamming capability.The main content of this thesis is summarized as follows:1.Basic research on polarization theory.Firstly,the definition of polarization and the characterization of polarization state are introduced,and then the polarization characteristics and characterization of the target are introduced.Next,the polarization measurement technology and polarization filtering technology are introduced in detail,and the advantages,disadvantages and applicable scope of different polarization measurement technologies are compared and summarized from the aspects of the amount of polarization information acquisition and the difficulty of engineering implementation.Finally,through the simulation of polarization filtering technology,the effectiveness of polarization filtering against interference is proved.2.Research on anti-deception jamming technology of polarized MIMO radar based on unilateral game.Firstly,the target signal model and the interference signal model of the polarized MIMO radar are established.Based on the difference between the polarization mode of the real target and the polarization mode of the false target,a discrimination method of true and false targets is designed.Then,the MVDR adaptive beamforming method is used to suppress the interference signal,and the influencing factors of the output SINR of the polarized MIMO radar system are analyzed.Based on this,a unilateral game-based polarized MIMO radar transmitting polarization optimization method is proposed.The polarization design problem between intelligent radar and unintelligent jammer is modeled as a twoperson zero-sum game.It is proved from simulation that the launch polarization optimization method based on unilateral game design can improve the output SINR.3.Research on anti-deception jamming technology of polarized MIMO radar based on strategic game.Firstly,the target signal model and the interference signal model of the polarized MIMO radar are established.According to the characteristic that oblique projection operator can suppress the interference without changing the amplitude phase of the target,the oblique projection filtering method is used to suppress the interference,and the anti-interference performance under the oblique projection theory is derived and analyzed.Based on this,an optimization method of polarization MIMO radar transmission based on strategy game is proposed.The polarization design problem between intelligent radar and intelligent jammer is modeled as a strategic two-person zero-sum game,and the method of solving the optimal transmitting polarization of the radar is offered.The simulation results show that the optimization method based on the strategy game design can achieve the ideal output SINR improvement.