Adaptive Beamforming Method Based on MISC Array in Non-uniform Noise
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Abstract
The adaptive beamforming algorithm based on Interference plus Noise Covariance Matrix (INCM) reconstruction cannot accurately calculate the power of non-uniform noise. This paper proposes an adaptive beamforming algorithm based on Maximum Inter-element Spacing Constraint (MISC) array to address this problem. Firstly, the noise-free covariance matrix and the non-uniform noise covariance matrix are estimated using matrix completion technique. Then the noise-free covariance matrix is used to estimate the Direction of Arrival (DOA) and power of the incident signal. Finally, INCM is reconstructed. With the accurate estimation of the non-uniform noise power by the matrix completion technique and the high degree of freedoms provided by the MISC virtual difference co-array, the proposed algorithm can reconstruct INCM more accurately under non-uniform noise. Simulation results demonstrate the effectiveness of the proposed algorithm.
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