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Entropy 2016, 18(3), 101; doi:10.3390/e18030101

A Complexity-Based Approach for the Detection of Weak Signals in Ocean Ambient Noise

School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
Authors to whom correspondence should be addressed.
Academic Editors: J.A. Tenreiro Machado and António M. Lopes
Received: 17 December 2015 / Revised: 4 March 2016 / Accepted: 8 March 2016 / Published: 18 March 2016
(This article belongs to the Special Issue Computational Complexity)
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There are numerous studies showing that there is a constant increase in the ocean ambient noise level and the ever-growing demand for developing algorithms for detecting weak signals in ambient noise. In this study, we utilize dynamical and statistical complexity to detect the presence of weak ship noise embedded in ambient noise. The ambient noise and ship noise were recorded in the South China Sea. The multiscale entropy (MSE) method and the complexity-entropy causality plane (C-H plane) were used to quantify the dynamical and statistical complexity of the measured time series, respectively. We generated signals with varying signal-to-noise ratio (SNR) by varying the amplification of a ship signal. The simulation results indicate that the complexity is sensitive to change in the information in the ambient noise and the change in SNR, a finding that enables the detection of weak ship signals in strong background ambient noise. The simulation results also illustrate that complexity is better than the traditional spectrogram method, particularly effective for detecting low SNR signals in ambient noise. In addition, complexity-based MSE and C-H plane methods are simple, robust and do not assume any underlying dynamics in time series. Hence, complexity should be used in practical situations. View Full-Text
Keywords: ambient noise; ship signal; Entropy; complexity; weak signal detection; stochastic dynamics ambient noise; ship signal; Entropy; complexity; weak signal detection; stochastic dynamics

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Siddagangaiah, S.; Li, Y.; Guo, X.; Chen, X.; Zhang, Q.; Yang, K.; Yang, Y. A Complexity-Based Approach for the Detection of Weak Signals in Ocean Ambient Noise. Entropy 2016, 18, 101.

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