Research On Mechanism Of Novel False Target Electromagnetic Jamming

To adapt to the development of tracking radar angle measurement technology and solve the shortcomings of the existing monopulse radar angle deception jamming methods,this thesis researched the electromagnetic jamming mechanism of multiple vectors-controlled false aircraft target.To make up for the shortcomings of little phase tolerance and low application stability of cross-eye jamming,we present jamming method by employing the multiple vectors-synthesis technique into the aircraft for the first time to disrupt monopulse radar.In the mathematical model,echo signals in sum and difference channels are described,and gain of triples are derived.In the electromagnetic model,the multiple vectors-controlled false aircraft target jamming is simulated and verified.The main content of this thesis is divided into the following parts.The introduction part.The first chapter introduces the background and significance of the research work,the monopulse radar interference method,especially the development and research status of the cross-eye jamming.The electromagnetic simulation algorithm on the electrical large-scale target is investigated.The theory part.Chapter two establishes the mathematical model of retrodirective cross-eye jamming and explains the reasons of equal amplitude and opposite phase.It points out that the cross-eye jamming has the disadvantages of platform rotation sensitivity and strict tolerance of phase parameter.Then,the multiple-vectors controled method is introduced.By comparing the distribution of the equivalent synthesizing centers with the cross eye jamming,the superiority of the multiple-vectors controled jamming is preliminarily proved.The model part.In chapter three,a strict mathematical model of multiple-vectors controled jamming is established for the first time according to the sum and difference channels of amplitude and phase comparision monopulse radars,and the gain of triples is derived.It is proved that the multiple-vectors controled jamming has the same jamming effect for the two kinds of monopulse radars.Analyzed how the feed parameters,jamming antennas layout,jamming distance,and rotation angle of jamming platform affect the jamming effect;The platform rotation sensitivity and tolerance of phase parameter is compared with the cross-eye jamming.The simulation results prove that multiple-vectors controled jamming has a more stable jamming effect than cross-eye jamming.The electromagnetic simulation verification part.Chapter four compares the highfrequency approximation algorithms in the FEKO according to the radar cross cection(RCS)simulation experiments of electrical large-scale targets.We simulate the multiplevectors controled jamming by using the method of moment-ray launching-geometrical optics(MoM-RL-GO).The simualteion results indicate that the multiple-vectors controlled jamming produceds phase distortion around the monopulse radar and causes larger errors in the angle measurement.The electromagnetic simulation results and mathematical model confirm mutually,which verify the effectiveness of the presented jamming method.