Resonance-Based Time-Frequency Manifold for Feature Extraction of Ship-Radiated Noise

Resonance-Based Time-Frequency Manifold for Feature Extraction of Ship-Radiated Noise

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In this paper, a novel time-frequency signature using resonance-based sparse read more signal decomposition (RSSD), phase space reconstruction (PSR), time-frequency distribution (TFD) and manifold learning is proposed for feature extraction of ship-radiated noise, which is called resonance-based time-frequency manifold (RTFM).This is suitable for analyzing signals with oscillatory, non-stationary and non-linear characteristics in a situation of serious noise pollution.Unlike the traditional methods which are sensitive to noise and just consider one side of oscillatory, non-stationary and non-linear characteristics, the proposed RTFM can provide the intact feature signature of all these characteristics in the form of a time-frequency signature by the following steps: first, RSSD is employed on the raw signal to extract the high-oscillatory component and abandon the low-oscillatory component.Second, PSR is performed on the high-oscillatory component to map the one-dimensional signal to the high-dimensional phase space.Third, TFD is employed to reveal non-stationary information in the phase space.

Finally, manifold learning is applied to the TFDs to fetch the intrinsic non-linear manifold.A proportional addition of the top two RTFMs is adopted to produce the improved RTFM signature.All of the case studies are validated on real audio recordings of ship-radiated noise.Case studies of ship-radiated noise on different datasets and satisfyer pro penguin next generation various degrees of noise pollution manifest the effectiveness and robustness of the proposed method.