NDLI: Cancellation of Towing Ship Interference in Passive SONAR in a Shallow Ocean Environment

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Cancellation of Towing Ship Interference in Passive SONAR in a Shallow Ocean Environment

Content Provider	DRDO Published Journals
Author	M., Remadevi Sureshkumar, N. Rajesh, R. Santhanakrishnan, T.
Abstract	Towed array sonars are preferred for detecting stealthy underwater targets that emit faint acoustic signals in the ocean, especially in shallow waters. However, the towing ship being near to the array behaves as a loud target, introducing additional interfering signals to the array, severely affecting the detection and classification of potential targets. Canceling this underlying interference signal is a challenging task and is investigated in this paper for a shallow ocean operational scenario where the problem is more critical due to the multipath phenomenon. A method exploiting the eigenvector analysis of spatio-temporal covariance matrix based on space time adaptive processing is proposed for suppressing tow ship interference and thus improving target detection. The developed algorithm learns the interference patterns in the presence of target signals to mitigate the interference across azimuth and to remove the spectral leakage of own-ship. The algorithm is statistically analyzed through a set of relevant metrics and is tested on simulated data that are equivalent to the data received by a towed linear array of acoustic sensors in a shallow ocean. The results indicate a reduction of 20-25dB in the tow ship interference power while the detection of long-range low SNR targets remain largely unaffected with minimal power-loss. In addition, it is demonstrated that the spectral leakage of tow ship, on multiple beams across the azimuth, due to multipath, is also alleviated leading to superior classification capabilities. The robustness of the proposed algorithm is validated by the open ocean experiment in the coastal shallow region of the Arabian Sea at Off-Kochi area of India, which produced results in close agreement with the simulations. A comparison of the simulation and experimental results with the existing PCI and ECA methods is also carried out, suggesting the proposed method is quite effective in suppressing the tow ship interference and is immensely beneficial for the detection and classification of long-range targets.
File Format	PDF
ISSN	0011748X
e-ISSN	0976464X
DOI	10.14429/dsj.72.17370
Alternate Webpage(s)	https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/17370/7695
Journal	Defence Science Journal
Issue Number	1
Volume Number	72
Language	English
Publisher Date	2022-01-05
Publisher Institution	DRDO-Naval Physical and Oceanographic Laboratory, Kochi - 682021, India
Access Restriction	Open
Subject Keyword	Self Noise Cancellation Towed Sonar Array Processing Tow Ship Interference Cancellation Target Detection in Shallow Ocean Spatio Temporal Processing
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary Chemical Engineering Electrical and Electronic Engineering Mechanical Engineering Biomedical Engineering Computer Science Applications Physics and Astronomy

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