Beamforming of Coherent Signals Based on Uniform Circular Array

In this paper a new method is proposed in order to suppress the coherent interference. First, utilizing the interpolate method, the real array can be virtually shifted under coherent interference, several covariance matrice are gererated after the virtual shifting. By averaging the previous results, a new covariance matrix is obtained. It is a full rank matrix. Then optimal weights are calculated using a common beamforming method. This method solves beamforming of 2-D coherent sources with a five-sensor uniform circular array. Simulation results confirm the availability of the new method in case of small data samples and low SNR. Moreover the proposed method is robust to the estimation errors of signal directions.