Research On Multi-Source Circular Array Reverse Cross-Eye Jamming To Monopulse Radar

Monopulse radar is a precision angle measurement and tracking radar with strong antijamming ability.It can obtain the angle information of the target only through a single pulse echo.It is widely used in military fields such as missile guidance and target tracking.At present,the most effective jamming method against monopulse radar is cross-eye jamming,which can make the line-of-sight pointing of monopulse radar deviated,thereby protecting military targets such as ships and aircraft.Multiple-Element Circular Retrodirective CrossEye Jamming(C-MRCJ)is a cutting-edge research in the field of cross-eye,which can achieve stable jamming in all directions,but the improvement of its jamming performance requires more the jammer and the antenna array elements are required,which increases the hardware cost and the complexity of the jamming system.In addition,C-MRCJ also needs to consider the influence of multiple interference loop differences and platform reflection echoes on the interference performance in the process of practical application.In view of the problems encountered in the practical process of C-MRCJ,this thesis conducts an in-depth study on the C-MRCJ that is beneficial to ship loading and use under the sixelement circular array structure with the antenna array being equiangularly spaced.In this thesis,the jamming performance of the six-array-based C-MRCJ under different jamming loop angles is carefully analyzed,and the possible jamming loop difference and the tolerance of the platform reflected echo to the system parameters in practical applications are discussed.The impact of interference performance and solutions are proposed.The main research work of this thesis can be divided into the following parts:1.The C-MRCJ system based on six array elements is modeled,and the performance indicators such as cross-eye gain and monopulse radar indication angle are deduced.The simulation results show that the six-array element C-MRCJ system can achieve stable and continuous interference in all directions when the carrying platform rotates.2.The interference loop difference that may occur in the operation of the C-MRCJ system based on six array elements is studied,and the influence of the interference loop difference on the interference performance and system parameter tolerance is analyzed.A compensation method is proposed for the phase difference of each interference path.In addition,the influence degree of the measurement error on the phase compensation error of the interference path is analyzed.The simulation results show that multiple jamming loops will increase the jamming loop difference while improving the jamming performance,and parameter tolerance and jamming performance.The necessity of compensating for the interference loop difference is explained.Finally,the feasibility of the compensation method is verified.3.The influence of the reflected echo from the ship platform on the C-MRCJ system based on six array elements is studied.Mathematically model the reflected echo from the platform,and derive expressions such as the total cross-eye gain.The relationship between the intersignal ratio and the total median cross-eye gain of the six-element-based C-MRCJ was analyzed.The simulation results show that the C-MRCJ based on six array elements has a relatively lower requirement on the JSR.At the same time,some suggestions are put forward for the reasonable value range of the signal-to-interference ratio in the project.