Diagonal Denoising for Conventional Beamforming via Sparsity Optimization

Conventional beamforming (CBF) is widely used in underwater acoustic applications due to its simplicity and robustness. Under certain circumstances, incoherent noise is the main disturbance for hydrophone arrays and can lead to a serious decline in the signal power estimation accuracy and signal det...

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Bibliographic Details
Published in:IEEE access 2020, Vol.8, p.11416-11425
Main Authors: Jiang, Guangyu, Sun, Chao, Liu, Xionghou
Format: Article
Language:English
Subjects:
Acoustic noise
Algorithms
Array signal processing
Beamforming
Contamination
conventional beamforming
Convergence
Covariance matrices
Covariance matrix
diagonal denoising
Hydrophones
Incoherent noise
Mathematical analysis
Matrix methods
Noise
Noise reduction
Optimization
Robustness (mathematics)
Signal detection
Signal to noise ratio
Sparsity
sparsity optimization
Underwater acoustics
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Summary:Conventional beamforming (CBF) is widely used in underwater acoustic applications due to its simplicity and robustness. Under certain circumstances, incoherent noise is the main disturbance for hydrophone arrays and can lead to a serious decline in the signal power estimation accuracy and signal detection ability of CBF. Since incoherent noise contamination is concentrated along the diagonal of the covariance matrix, we propose to improve the performance of CBF by reducing the diagonal as much as possible to suppress the incoherent noise until the output spatial spectrum becomes sparsest. Mathematically, the denoising problem is convex; hence, it can be solved with guaranteed efficiency and convergence properties. The proposed denoising algorithm is named the sparsity-optimization-based diagonal denoising (SO-DD) algorithm, and its capability is investigated and compared with the recently developed positive-semidefinite-constrained diagonal denoising (PSC-DD) algorithmvia simulation and experiments. The results suggest that both SO-DD and PSC-DD work well under ideal conditions where noise is perfectly incoherent, while SO-DD performs more reliably when noise is partially coherent due to limited sampling and the existence of coherent noise component in practice.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2020.2964296