A Time-Frequency Joint Time-Delay Difference Estimation Method for Signal Enhancement in the Distorted towed Hydrophone Array

To acquire the enhanced underwater ship-radiated noise signal in the presence of array shape distortion in a passive sonar system, the phase difference of the line-spectrum component in ship-radiated noise is often exploited to estimate the time-delay difference for the beamforming-based signal enha...

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Autores principales:	Chuanqi Zhu, Shiliang Fang, Qisong Wu, Liang An, Xinwei Luo, Hongli Cao
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	signal enhancement array shape distortion passive sonar system underwater acoustic radiated noise beamforming time-delay difference estimation Science Q
Acceso en línea:	https://doaj.org/article/d5e11b81943d49c6a797eddfbc25c015
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id	oai:doaj.org-article:d5e11b81943d49c6a797eddfbc25c015
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spelling	oai:doaj.org-article:d5e11b81943d49c6a797eddfbc25c0152021-11-25T18:54:35ZA Time-Frequency Joint Time-Delay Difference Estimation Method for Signal Enhancement in the Distorted towed Hydrophone Array10.3390/rs132245862072-4292https://doaj.org/article/d5e11b81943d49c6a797eddfbc25c0152021-11-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/22/4586https://doaj.org/toc/2072-4292To acquire the enhanced underwater ship-radiated noise signal in the presence of array shape distortion in a passive sonar system, the phase difference of the line-spectrum component in ship-radiated noise is often exploited to estimate the time-delay difference for the beamforming-based signal enhancement. However, the time-delay difference estimation performance drastically degrades with decreases of the signal-to-noise ratio (SNR) of the line-spectrum component. Meanwhile, although the time-delay difference estimation performance of the high-frequency line-spectrum components is generally superior to that of the low-frequency one, the phase difference measurements of the high-frequency line-spectrum component often easily encounter the issue of modulus 2<inline-formula><math display="inline"><semantics><mi>π</mi></semantics></math></inline-formula> ambiguity. To address the above issues, a novel time-frequency joint time-delay difference estimation method is proposed in this paper. The proposed method establishes a data-driven hidden Markov model with robustness to phase difference ambiguity by fully exploiting the underlying property of slowly changing the time-delay difference over time. Thus, the phase difference measurements available for time-delay difference estimation are extended from that of low-frequency line-spectrum components in a single frame to that of all detected line-spectrum components in multiple frames. By jointly taking advantage of the phase difference measurements in both time and frequency dimensions, the proposed method can acquire enhanced time-delay difference estimates even in a low SNR case. Both simulation and at-sea experimental results have demonstrated the effectiveness of the proposed method.Chuanqi ZhuShiliang FangQisong WuLiang AnXinwei LuoHongli CaoMDPI AGarticlesignal enhancementarray shape distortionpassive sonar systemunderwater acoustic radiated noisebeamformingtime-delay difference estimationScienceQENRemote Sensing, Vol 13, Iss 4586, p 4586 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	signal enhancement array shape distortion passive sonar system underwater acoustic radiated noise beamforming time-delay difference estimation Science Q
spellingShingle	signal enhancement array shape distortion passive sonar system underwater acoustic radiated noise beamforming time-delay difference estimation Science Q Chuanqi Zhu Shiliang Fang Qisong Wu Liang An Xinwei Luo Hongli Cao A Time-Frequency Joint Time-Delay Difference Estimation Method for Signal Enhancement in the Distorted towed Hydrophone Array
description	To acquire the enhanced underwater ship-radiated noise signal in the presence of array shape distortion in a passive sonar system, the phase difference of the line-spectrum component in ship-radiated noise is often exploited to estimate the time-delay difference for the beamforming-based signal enhancement. However, the time-delay difference estimation performance drastically degrades with decreases of the signal-to-noise ratio (SNR) of the line-spectrum component. Meanwhile, although the time-delay difference estimation performance of the high-frequency line-spectrum components is generally superior to that of the low-frequency one, the phase difference measurements of the high-frequency line-spectrum component often easily encounter the issue of modulus 2<inline-formula><math display="inline"><semantics><mi>π</mi></semantics></math></inline-formula> ambiguity. To address the above issues, a novel time-frequency joint time-delay difference estimation method is proposed in this paper. The proposed method establishes a data-driven hidden Markov model with robustness to phase difference ambiguity by fully exploiting the underlying property of slowly changing the time-delay difference over time. Thus, the phase difference measurements available for time-delay difference estimation are extended from that of low-frequency line-spectrum components in a single frame to that of all detected line-spectrum components in multiple frames. By jointly taking advantage of the phase difference measurements in both time and frequency dimensions, the proposed method can acquire enhanced time-delay difference estimates even in a low SNR case. Both simulation and at-sea experimental results have demonstrated the effectiveness of the proposed method.
format	article
author	Chuanqi Zhu Shiliang Fang Qisong Wu Liang An Xinwei Luo Hongli Cao
author_facet	Chuanqi Zhu Shiliang Fang Qisong Wu Liang An Xinwei Luo Hongli Cao
author_sort	Chuanqi Zhu
title	A Time-Frequency Joint Time-Delay Difference Estimation Method for Signal Enhancement in the Distorted towed Hydrophone Array
title_short	A Time-Frequency Joint Time-Delay Difference Estimation Method for Signal Enhancement in the Distorted towed Hydrophone Array
title_full	A Time-Frequency Joint Time-Delay Difference Estimation Method for Signal Enhancement in the Distorted towed Hydrophone Array
title_fullStr	A Time-Frequency Joint Time-Delay Difference Estimation Method for Signal Enhancement in the Distorted towed Hydrophone Array
title_full_unstemmed	A Time-Frequency Joint Time-Delay Difference Estimation Method for Signal Enhancement in the Distorted towed Hydrophone Array
title_sort	time-frequency joint time-delay difference estimation method for signal enhancement in the distorted towed hydrophone array
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d5e11b81943d49c6a797eddfbc25c015
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A Time-Frequency Joint Time-Delay Difference Estimation Method for Signal Enhancement in the Distorted towed Hydrophone Array

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