Research On Synthetic Aperture Radar Deception Jamming Based On Interference Trace Optimization

Synthetic aperture radar(SAR)is an all-weather and all-day high resolution remote sensing imaging technology,so it is widely used in battlefield intelligence acquisition,reconnaissance and so on.SAR Electronic Counter Measure(ECM)is mainly divided into passive jamming and active jamming.Active jamming mainly includes suppression jamming and deception jamming.Suppression jamming requires higher power of jammer,and deception jamming has obvious interference traces.In this paper,the existing problems of deception jamming are studied.A compound jamming method of active cancellation and scene fusion is proposed to eliminate interference traces,and a target of interest(TOI)contour feature recombination method is proposed to carry out fine interference.The main research contents are as follows:1.A composite jamming method of active cancellation and scene fusion is proposed.In order to make the jamming template have better deception performance,firstly,the scattering coefficient of the scene around the TOI is extracted to make the template.By intercepting the echo signal,amplitude modulation and frequency shift are carried out to generate interference signal.Finally,the deception signal and the cancellation signal are forwarded,and then the composite interference method is completed.In the final SAR image,the TOI is cancelled,and the generated black cancellation area is covered by deception signal,eliminating interference traces.2.The deception template made by the scattering coefficient of the scene around the TOI was improved,and the problem of incompatibility at the boundary of the deception template was solved by sampling in reverse sort,and the problem of incompatibility at the center of the deception template was solved by retrieving of the optimal value.Finally,the optimal deception template was obtained and the interference performance was effectively improved.3.The TOI contour feature reorganization method is proposed,which can accurately and quickly copy the radar echo signal through Digital Radio Frequency Memory(DRFM)technology,and then transmit the replication signal with frequency shift modulation and forwarding,so that the contour features of the TOI can be recombination,It can reduce the probability of the TOI recognition.Finally,the effectiveness of the method is verified by simulation.