Research And Implementation Of Efficient Generation Method Of Radar Active Jamming

Modern radars generally use techniques such as pulse compression and coherent accumulation.Since the signals generated by the conventional active jamming mismatch the radar transmitted signal,the corresponding processing gain cannot be obtained after entering the radar receiver,and the jamming effect is greatly reduced.With the rapid development of digital radio frequency memory,coherent jamming has become the mainstream development direction of active jamming because of high power utilization and good deception effect.Based on this background,this thesis deeply studies the interrupted sampling repeater jamming and smart noise jamming,and gives an efficient FPGA generation method for the complex structure of traditional generation methods.The main work of the thesis is as follows:1.Aiming at the linear frequency modulation signal with large time width,combined with the composition and working principle of digital radio frequency memory,the principles and jamming characteristics of the interrupted sampling direct-repeater jamming,interrupted sampling repeat-repeater jamming,and interrupted sampling circle-repeater jamming are studied and analyzed.The waveforms of the three jamming signals under different parameters are given,and these jamming patterns are compared from the perspective of jamming effects and hardware implementation difficulties.2.Aiming at the problems that the energy of traditional noise jamming is not concentrated and the jamming power utilization rate is low,smart noise jamming is studied.First,the theoretical derivation explains the reason why this jamming signal can obtain the pulse compression processing gain after entering the radar receiver.Then,the jamming signal rate gain and jamming power of smart noise jamming are analyzed to explain its advantages compared to traditional noise jamming.Finally,the jamming effect was verified by simulation.3.Based on the interrupted sampling repeater jamming and smart noise jamming,three kinds of complex-jamming patterns including interrupted sampling frequency-shift repeater jamming,frequency-shift smart noise jamming and interrupted sampling smart noise repeater jamming were studied.Researches have shown that complex-jamming combines the advantages of each of the basic jamming patterns and can produce better jamming effects.4.The architecture of the jamming system is introduced,and the efficient generation method of the interrupted sampling repeater jamming and smart noise jamming is designed based on the actual situation of the jammer.The key modules involved in the algorithm are explained in detail.Finally,the test of the jamming signal is completed on the hardware platform,and the resource consumption is given.