Research On LFM Pulse Compression Radar Jamming Based On Digital Channelization

Modern warfare has gradually entered the age of informationization.Radar electronic warfare(including radar reconnaissance,radar jamming,etc.)has become the most important part of the informationization battleground and it has played an important role in the war.With the anti-jamming technology for radar Research and the continuous innovation of electronic devices,many new system radars including linear frequency modulation pulse compression radar which has a wide operating bandwidth range and good anti-interference performance.Therefore,the jamming modulation system for these new system radars has become a hot spot.In this paper,the active jamming methods of LFM pulse compression radar are researched.Based on the traditional radar active interference system,digital channelization technology and new methods of active interference generation are introduced to make the active interference system have wider instantaneous interception bandwidth.A larger instantaneous dynamic range and more flexible bandwidth matching are based on more effective interference with radar signals,at the same time,multiple interferences can be transmitted simultaneously.Firstly,it summarizes the research background and significance of the subject,summarizes the interference technology of linear frequency modulated pulse compression radar and the research status and development of digital channelization at home and abroad.In addition,the basic working principle of LFM pulse compression radar is introduced.Secondly,the structural framework of active interference modulation system based on digital channelization is proposed,which mainly includes three parts: digital channelized receiving,interference modulation and digital channelized emission.In the channel division part,this paper proposes a new structure including interpolation FIR filters with multiphase filtering channelization and it gives the corresponding structural model and theoretical derivation,mainwhile it verifies the structure through simulation.The structure is also compared with other channelization structures,and this proposed structure can effectively reduce the amount of calculation.In the channel synthesis part,it proposes an efficient channel synthesis structure based on the IFIR filters,and simulation is performed to verify the correctness of the structure.Finally,the theoretical analysis and simulation of the active jamming method of LFM pulse pressure radar are performed: 1.active product jamming including square wave product jamming,compared with intermittent sampling and direct forward interference,this method can not only false targets,will not enhance the energy of the real target signal;2.active convolution jamming including random pulse convolution,compared with rectangular pulse convolution jamming,this method can not only interfere with both suppressive and deceptive jamming,but also has a wider range of jamming time;3.the expression of the maximum detection range of LFM pulse pressure radar under distributed noise jamming is studied,and the influence of relevant jamming parameters on the radar jamming exposed area is studied.