Research And Realization Of Radar Signal Active Jamming Technology

With the development of electronic warfare technology,electronic warfare occupies an increasingly prominent position in modern warfare.As an eye on the battlefield,radar countermeasures have become an important part of electronic warfare.Radar countermeasure is an effective action to suppress the electromagnetic spectrum used by the enemy.With the continuous development of radar technology,radar anti-jamming technology is also constantly improving,which poses new challenges to the realization of radar active jamming technology and its hardware platform.At the same time,the signal in the complex electromagnetic environment has the characteristics of large bandwidth,complex and changeable modulation style,wide frequency band coverage and so on.Therefore,the jamming equipment should not only have larger instantaneous bandwidth and higher reconnaissance sensitivity,but also have higher and higher requirements on the signal processing speed.Therefore,how to solve the problem of broadband simultaneous jamming is a strict test for jamming equipment.The main work of this paper is as follows:1.The realization of radar active jamming technology is studied in this paper.Firstly,the principle of the realized jamming style is studied,which mainly includes two kinds of jamming forms,covering jamming and deception jamming respectively.Moreover,the theory research and sequence analysis of the forwarded jamming technology based on DRFM are carried out.Then the hardware platform of the implementation of active jamming style is described and analyzed,and the process of the implementation of jamming is introduced.Based on FPGA hardware platform,noise frequency modulation jamming based on M sequence mapping,comb spectrum jamming based on frequency point storage addition,sweep jamming based on function wave mapping and deception jamming,intermittent sampling module,delay stack module and smart noise jamming are proposed,and the above jamming patterns are implemented.2.In order to realize the detection and jamming of large bandwidth radar signals,an integrated system of reconnaissance and jamming based on MWC technology is proposed.In this system,the signals received by multiple channels are randomly mixed using MWC principle,and then the single-channel ADC is collected after multi-channel composite,and the composite compressed signals are obtained.Then add the specified style jamming to the compressed signal to generate the compressed jamming signal.Then,random unmixing of composite compression signals of single-channel DAC is completed.Finally,multiple launch.The simulation results show that the new integrated system of reconnaissance jamming can jamming the received radar signals at the same time in multiple frequency bands,and only requires a few paths or even one path sampling.Finally verify the input SNR and the influence of mixing sequence correlation of the jamming signal,the results show that each channel input noise will not affect other channels,and when mixing pseudo random sequence is not orthogonal,solve the mixed jamming signal will be superimposed on all other channels by the correlation coefficient of modulation jamming signal and noise.