Radar Anti Interference Technology With The Application Of Waveform Diversity And Agility

As the electronic countermeasure under the complex battlefield environment becomes more intense,traditional guidance radar anti-jamming methods more and more can't meet the requirement of high-tech warfare,is an urgent need to study effective radar anti-jamming method is applied to radar detection process.Based on the guidance radar anti-jamming technology as the research background,research of anti-ship missile radar seeker typical passive interference,a feasible way to active deception interferencePaper first briefly introduces the radar typical passive interference resistance,and the research status of active jamming,summarizes the key technology.This paper introduces the research background and the main work.Then from passive interference and active jamming signal generation and anti-passive interference and anti-active interference from three aspects,the study of the production of the jamming signal and its influence on receiver,passive corner reflector interference method and the technology of DRFM(DRFM,Digital Radio Frequency Memory)interference.In the generation of interference signal,the corner reflector interference is studied and the principle of DRFM deception interference generated the influence of the interference signal to the receiver.In the principle of interference,through the electromagnetic field theory,the article analyses the interference mechanism of dihedral reflector;and the article theory analyses the principle of DRFM interference signal and storage;And by using SJNR(SJNR,Signal to Jamming plus Noise Ratio)analysis the influence of interference signals of the radar receiver.The traditional anti Angle reflector interference and anti-interference of DRFM is studied and the simulation analysis.In the radar waveform diversity anti Angle reflector interference,modeling of ballistic missile flight;Using mixed intra-pulse modulation waveform on the time of diversity.According to the mixed intra-pulse modulation achieve waveform diversity on time.Then different sub pulse imaging was carried out on the scene.Use the information distance to measure the difference between the target and the interference.Select the optimal sub pulse according to the principles of information distance is largest.Optimal sub pulse can distinguish between target and false target best.The one dimensional distance profile as matched with template library,use the identification test and verify the reliability of the sub pulse,to form the whole algorithm of optimal detection waveform selection strategy.In radar waveform agility anti DRFM interference,according to the interference of DRFM forwarding echo delay the current target echo characteristics,waveform digital watermarking method is proposed to counter DRFM interference,through waveform digital watermarking technology in radar signal envelope of different pulse repetition interval attach different modulation,make each pulse signal envelope carry different information,thus according to echoes information differences to identify true and false echo,and then to suppress interference.The use of simple waveform watermark technology of anti-jamming performance of SNR has certain requirements,so digital watermarking method is proposed combination method of adjustable frequency agility polarity interference suppression,and through the simulation analysis of the performance impact of many factors against interference.