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Enhanced target detection and classification using two-pulse sonar methods

Enhanced target detection and classification using two-pulse sonar methods
Enhanced target detection and classification using two-pulse sonar methods
A number of two-pulse sonar techniques can be employed to separate linear and nonlinear scatterers. Twin Inverted Pulse Sonar (TWIPS) and Biased Pulse Summation Sonar (BiaPSS) are processes that exploit nonlinear bubble dynamics to perform such a classification, with clutter reduction. Consequently, these techniques can be used to enhance target detection in bubbly waters. TWIPS and BiaPSS rely upon bubbles being driven to large nonlinear pulsations, but this is dependent upon availability of a high-amplitude source. Previous studies could only access a narrow-band source and therefore used a low frequency so that, over the rarefaction cycle, most ocean bubbles would expand sufficiently (the size range of near-surface ocean bubbles under waves and wakes being large). However, recent access to a broadband high-power source has allowed exploitation of bubble resonances. This talk presents results of investigations using broadband linear sine sweeps, of which one is based upon the simulation of an Atlantic Bottlenose Dolphin (Tursiops truncatus) echolocation click from Capus et al. (2006). Insonifying a cloud of bubbles with a wide band of frequencies excites as many of those sizes at, or close to, their resonance. As such, the contrast between linear and nonlinear scatter is enhanced, improving the target detection capability.
Nonlinear scattering, Sonar, Bubble dynamics, Oceans, Linear scattering
0001-4966
2968
Mistry, Nikhil
9337a38c-86fb-40d5-8413-efc8c23e5034
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Mistry, Nikhil
9337a38c-86fb-40d5-8413-efc8c23e5034
White, Paul
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae

Mistry, Nikhil, White, Paul and Leighton, Timothy (2016) Enhanced target detection and classification using two-pulse sonar methods. Journal of the Acoustical Society of America, 140 (4), 2968. (doi:10.1121/1.4969181).

Record type: Meeting abstract

Abstract

A number of two-pulse sonar techniques can be employed to separate linear and nonlinear scatterers. Twin Inverted Pulse Sonar (TWIPS) and Biased Pulse Summation Sonar (BiaPSS) are processes that exploit nonlinear bubble dynamics to perform such a classification, with clutter reduction. Consequently, these techniques can be used to enhance target detection in bubbly waters. TWIPS and BiaPSS rely upon bubbles being driven to large nonlinear pulsations, but this is dependent upon availability of a high-amplitude source. Previous studies could only access a narrow-band source and therefore used a low frequency so that, over the rarefaction cycle, most ocean bubbles would expand sufficiently (the size range of near-surface ocean bubbles under waves and wakes being large). However, recent access to a broadband high-power source has allowed exploitation of bubble resonances. This talk presents results of investigations using broadband linear sine sweeps, of which one is based upon the simulation of an Atlantic Bottlenose Dolphin (Tursiops truncatus) echolocation click from Capus et al. (2006). Insonifying a cloud of bubbles with a wide band of frequencies excites as many of those sizes at, or close to, their resonance. As such, the contrast between linear and nonlinear scatter is enhanced, improving the target detection capability.

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More information

Published date: November 2016
Keywords: Nonlinear scattering, Sonar, Bubble dynamics, Oceans, Linear scattering

Identifiers

Local EPrints ID: 416069
URI: http://eprints.soton.ac.uk/id/eprint/416069
DOI: doi:10.1121/1.4969181
ISSN: 0001-4966
PURE UUID: 35a37746-137b-4d8c-a928-dabe26060a21
ORCID for Nikhil Mistry: ORCID iD orcid.org/0000-0001-7567-4390
ORCID for Paul White: ORCID iD orcid.org/0000-0002-4787-8713
ORCID for Timothy Leighton: ORCID iD orcid.org/0000-0002-1649-8750

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Date deposited: 01 Dec 2017 17:30
Last modified: 14 Mar 2019 01:54

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Author: Nikhil Mistry ORCID iD
Author: Paul White ORCID iD
Author: Timothy Leighton ORCID iD

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