Journal
APPLIED ACOUSTICS
Volume 196, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2022.108899
Keywords
Ship-radiated noise signal; Slope entropy; High-precision sensor; Feature extraction; K-nearest neighbor; Variational mode decomposition
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Funding
- Key Research & Development Plan of Shaanxi Province [2020ZDLGY06-01]
- Key Scientific Research Project of Education Department of Shaanxi Province [21JY033]
- Science & Technology Plan of University Service Enterprise of Xi'an [2020KJRC0087]
- Natural Science Foundation of Shaanxi Province [2022JM-337, 2021JQ487, 2020JQ-644]
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This study introduces a new feature extraction method for underwater acoustic signal processing, called slope entropy (SloE). Combined with the variational mode decomposition algorithm, the proposed method analyzes and recognizes ship-radiated noise signals based on the extraction of SloE. The experimental results demonstrate that the feature extraction method based on SloE achieves a higher recognition rate.
To extract more distinguishing features of ships, slope entropy (SloE) is introduced into underwater acoustic signal processing as a new feature to analyze ship-radiated noise signal (S-NS) complexity. SloE can solve the defect that permutation entropy (PE) ignores the amplitude information of time series, and has not been employed to the field of underwater acoustics. On this basis, combined with the variational mode decomposition (VMD) algorithm, a feature extraction method of S-NS based on VMD and SloE is proposed. Firstly, S-NSs are collected by high-precision sensor, and the S-NS are decomposed into a series of the intrinsic mode functions by VMD. Then, the SloE of IMFs are extracted, and the recognition rate is calculated by k-nearest neighbor (KNN) algorithm. Finally, the comparison experiments with permutation entropy (PE), dispersion entropy (DE), reverse dispersion entropy (RDE) and fluctuation dispersion entropy (FDE) are carried out. The experimental results show that under the condition of single feature, SloE has the highest recognition rate; under the condition of multiple features, the feature extraction method based on SloE can attain higher recognition rate under the same number of features, and can realize the effective recognition of S-NSs. (C) 2022 Elsevier Ltd. All rights reserved.
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