Discrimination Technology Of Repeating Decoys Based On Scattering Characteristics

With the rapid development of radar electronic warfare,advanced electronic jamming technology and electronic jamming equipment are emerging,and the working environment of the radar is more complex.In recent years,repeating decoys based on DRFM technology,with real goals similar to the speed,track,waveform characteristics,radar receiver has been difficult to distinguish between actual targets and repeating decoys in time,frequency and airspace domain.A large number of decoys jamming seriously consume radar resources,and pose the severe challenge to the modern surveillance and tracking system.So it is urgent to improve the technology of anti active deception jamming.The essence of radar anti-jamming is to use the characteristic difference between the jamming signal and the useful signal to restrain jamming signal and keep or enhance the useful signal.The use of target echoes,such as amplitude,phase,angular glint and polarization characteristics,is an effective means of resisting active deception jamming.Under normal circumstances,the real target as a complex scatterer can be regarded as multi-point scattering target,while the jammer active radiation is equivalent to single-point scattering target.Based on this essential difference,the discrimination of repeating decoys are studied by angular glint,range glint and phase characteristic.The main research contents are as follows: 1? According to the amplitude ratio monopulse angular measurement model,the paper analyzes angular glint in theory and explains its physical essence from the perspective of echo spectrum distortion.On this basis,the angular error of point target and complex target is studied and the angular glint statistical model is established,and the NP theorem and the generalized likelihood ratio model are used to make judgment.Algorithm's validity is verified by monte carlo simulation.2?According to the sampling ratio ranging measurement model,the paper analyzes range glint in theory.On this basis,the range error of point target and complex target is studied and the range glint statistical model is established,and the NP theorem and the generalized likelihood ratio model are used to make judgment.Algorithm's validity is verified by monte carlo simulation.3?In this paper,the linear frequency modulation signal is studied theoretically.On this basis,the phase characteristics statistics model is established,and the NP theorem and the generalized likelihood ratio model are used to make discrimination.Algorithm's validity is verified by monte carlo simulation.