Research On Intelligent Sidelobe Interference For Space-time Adaptive Processing

The essential technology of airborne-phased array radar is space-time adaptive processing,which can superiorly overcome clutter filtering and resist jamming.This research is focused on the space-time adaptive sidelobe interference technology,and the main work tasks are as follows:1.The space-time adaptive processing technology is introduced,and the geometric model of space-time adaptive radar signal processing is established.This paper introduces STAP all space-time adaptive processing algorithm and two-dimensional reduced dimension spacetime adaptive processing algorithms m-dt and JDL.In addition,the results of simulation performance show that three algorithms have good clutter and interference suppression effects,and the all space-time adaptive processing algorithm has the best clutter suppression effect.2.The basic principle of space-time adaptive processing of sidelobe interference is also an essential part.In this research,four traditional jamming modes have been introduced,including(1)broadband noise suppression jamming,(2)narrowband aiming frequency suppression jamming,(3)slice reconstruction jamming and(4)multi false target jamming.Apart from that,the defects of traditional sidelobe jamming in the face of space-time adaptive processing system are analyzed.Meanwhile,the weakness of space-time adaptive processing algorithm has been considered,and the effectiveness of the idea of space-time adaptive processing of sidelobe interference has been analyzed.3.The space-time adaptive processing of intelligent sidelobe interference as well as its effect evaluation is also explored in this research.Beyond that,the root causes of poor interference effect of traditional line of sight sidelobe interference on space-time adaptive processing system are listed in detail.In the proposal,there are five interference influencing factors,which are range gate coverage weight factor,range gate effective coverage density,non independent and identically distributed factor,effective utilization of band resources,and time-domain coverage.Furthermore,a set of interference parameter waveform optimization algorithms based on particle swarm intelligence algorithm are proposed.On the premise of having certain prior knowledge,the algorithm can intelligently find the optimal parameter setting of various types of interference signals,and then determine the current optimal interference strategy after comparison.According to the simulation results,the algorithm is effective.4.Lastly,the space-time two-dimensional sidelobe interference technology is investigated.To be specific,this research introduces two jamming technologies: cast scattering pseudo clutter jamming and cast scattering wide time limit swept frequency jamming.As shown by the simulation results,the above jamming technology is effective.Given that the above two kinds of projection and scattering jamming may be limited by complex terrain in practical application,the projection and scattering jamming model based on chaff cloud is established.Then,the projection and scattering pseudo clutter jamming based on chaff cloud as well as the wide time sweep jamming based on chaff cloud is proposed.According to the simulation results,the proposed two jamming patterns are effective,especially the chaff cloud based wide time sweep jamming,which can not only greatly consume the freedom of space-time processing system but also reduce its processing performance.