A Multi-dimensional Jamming Suppression Method Based on Covariance Matrix Taper
When the jammer moves at a high speed relative to the radar array antenna,the interfer-ence exhibits non-stationary characteristics.If traditional anti-jamming algorithms are used to sup-press the jamming,zero traps and jamming mismatch will occur,which will lead to the failure of anti-jamming.To solve this problem,a multi-dimensional jamming suppression method based on covariance matrix taper(CMT)is proposed,which can achieve accurate signal interference separa-tion in multi-dimension of polarization,space and time.Firstly,by adding virtual interference clus-ters that follow the Laplace distribution in the dimensions of polarization and spatial,the changes in the direction of arrival(DOA)disturbance of dynamic interference waves are simulated.Then,this paper constructs a tapering matrix and tapers the original covariance matrix,and combines it with the minimum variance distortionless response(MVDR)beamformer to achieve zero trap broadening.The simulation experiment verifies the feasibility of the proposed method under jam-ming DOA disturbance from three aspects:anti-jamming zero traps,output performance,matched filtering results.In addition,the proposed method can also effectively suppress the jamming from the main lobe.
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