DOA estimation algorithm of the suppressed coherent interference based on uniform circular array
In order to solve the problem that the general direction-of-arrival(DOA)algorithm cannot effectively estimate the direction of arrival of signals containing coherent interference on a uniform circular array,a MUSIC algorithm based on the reconstruction of covariance matrix of virtual linear array is proposed.This algorithm forms a virtual linear array by mode space transformation of the uniform circular array,and reconstructs all rows of the data covariance matrix after mode space transformation by Toeplitz.All Toeplitz matrices are constructed into a new equivalent full rank data covariance matrix to achieve the purpose of decoherence.Combined with the MUSIC algorithm on the virtual linear array,the spectral peak position of the spatial spectrum can be obtained directly through the multispectral peak search algorithm,thus completing the DOA estimation of the interference direction.Computer simulation results verified that the algorithm can still effectively estimate the direction of arrival of signals when there is coherent signal and the signal angle is about 30° apart.
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