Interference coherent robust beam forming method of unknown mutual coupling information under mutual coupling condition

Abstract

The invention discloses an interference coherent robust beam forming method of unknown mutual coupling information under a mutual coupling condition, and belongs to the beam forming technology in the field of adaptive array signal processing. According to the interference coherent robust beam forming method disclosed by the invention, based on the particularity of an array mutual coupling structure, when the specific array mutual coupling information is unknown, an interference plus noise covariance matrix and an expected signal covariance matrix are separately constructed, and a final weight vector is figured out by using the maximum signal-to-noise criterion. According to the interference coherent robust beam forming method disclosed by the invention, the mutual coupling information does not need to be known in advance, an expected signal guide vector does not need to be estimated, and no spatial smoothing decoherence processing needs to be carried out. When the expected signal power is strong and weak, very good performance is kept, and fast convergence can be realized.

Description

technical field [0001] The invention relates to a beamforming technology in the field of adaptive array signal processing, in particular to a robust beamforming method when mutual coupling exists in a uniform line array under the condition of unknown mutual coupling information and interference coherence. Background technique [0002] Most of the existing robust beamforming methods basically assume that the beamforming is performed under the ideal condition that the interference and the desired signal are irrelevant or mutually uncorrelated. In the actual complex communication environment, due to the existence of factors such as multipath reflection and electromagnetic interference, signal sources are often coherent or correlated. At this time, the covariance matrix of the source signal received by the array will lack rank, so that the direction vectors of some coherent sources are no longer orthogonal to the noise subspace, and nulls cannot be formed in the interference dir...

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Problems solved by technology

[0019] The purpose of the invention is to: aiming at the situation that the existing beamforming method can only solve the coherence or correlation of signal sources, the present invention discloses a method that can effectively solve the problems of array mutual coupling and signal source coherence or correlation at the same time

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