Modeling And Simulation Of Anti-main Lobe Jamming Method For Multi-station Radar

With the development of electromagnetic jamming technology,the jamming patterns that radar faces in the battlefield are more and more diverse.According to the position of radar antenna orientation pattern,jamming can be divided into main lobe jamming and side lobe jamming.Main lobe jamming refers to the jamming that enters from the main lobe of radar orientation pattern.Nowadays,active spoofing jamming and main lobe compression jamming are mainly studied.At present,the anti-jamming methods for side lobe jamming are becoming more and more mature,while the anti-main lobe jamming method research is still in the development stage,which is the focus and difficulty of current anti-jamming research.The multi-station radar system can identify and suppress the jamming signals effectively by fusion analysis of the echo data from different viewing angles and mining the differences between the target and jamming signals from the data level and signal level.This paper focuses on the cooperative anti-main lobe jamming method of multi-station radar system,and conducts in-depth research on the anti-jamming methods related to active deceptively jamming and suppressed jamming entering from the main lobe.The main work includes the following three parts:1.The identification method of true and false targets under the condition of target tracking is studied.Aiming at the problem that the current track identification methods of true and false targets do not have real-time performance,this method uses the updated target track information and error covariance to construct a new discriminator for true and false targets identification in the process of generating true and false targets track,which has real-time performance.Compared with the traditional discriminator constructed by using the target information which is not updated by filtering,the performance of the new discriminator is improved.Finally,the algorithm performance is simulated to verify the above characteristics.2.Considering that the factors of ship sway at sea will have a certain influence on the target detection and anti-jamming performance of shipborne radar,the anti-deceiving false target jamming method of multi-station radar under the condition of ship sway is studied.The compensation method of ship rolling under the condition of ship rocking is analyzed.After ship rolling compensation,a new target positioning error covariance is derived by combining the radar measurement error and ship attitude measurement error.Finally,the true and false targets are identified.The simulation results show that the method can counteract the influence of ship sway on radar measurement and obtain a better target identification probability.3.In view of the problem that the subspace projection anti-main lobe compression jamming method will appear false peak in the remote support jamming scene,a subspace projection anti-jamming method which can realize false peak identification is studied.Pseudo peak refers to the time domain matching of the echo signals of each radar station.Due to the different positions of the target and the jammer,the compressed jamming signals can be registered while the target echo signals cannot be registered,resulting in the false signal peak generated after interference suppression.In view of the above problems,after the echo signal is projected to the noise subspace to eliminate the interference signal,the range dimension information and Angle dimension information of the multi-station radar system are utilized comprehensively to realize the location of the real target and eliminate the influence of the false peak.Finally,the simulation results show the effectiveness of the proposed method.