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Measurement and analysis of array gain degradation due to bubble scattering

Measurement and analysis of array gain degradation due to bubble scattering
Measurement and analysis of array gain degradation due to bubble scattering
When an array is steered in the direction of a signal, array gain (AG) is maximum when the signal is coherent across the array, meaning that the signals add in phase for all elements and the noise or interference is incoherent across the array (i.e., it adds with random phase). For an acoustic array operating in the ocean, we would like to understand the degree to which scattering by nearby bubbles degrades AG. Bubble attenuation can also degrade array performance by attenuating the signal of interest, but that is separate from AG degradation. The degradation of AG due to scattering by nearby bubbles has been measured for different bubble densities. We have analyzed the relationship between bubble density at the array and the degradation in AG. We present probability density functions (pdfs) of signal amplitude and phase at the array elements. The amplitude pdfs can be approximated as a Rayleigh–Rice distribution, and the phase pdfs follow the von Mises distribution. With independence assumed between amplitude and phase distributions, simulated distributions generate array gain distributions closely matching the measured AG distribution
0001-4966
1817-1818
Park, J. Daniel
c28fe44a-2819-44a8-a382-ba082c4c5c75
Holt, Fred D.
23c6fb40-2ece-4ff8-856e-a6fa858467c5
Culver, R. Lee
cc203f09-36c7-457f-b909-c5ecb96bcdb8
Coles, David
de60477c-eb71-49e0-8038-5d2d030aa053
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Park, J. Daniel
c28fe44a-2819-44a8-a382-ba082c4c5c75
Holt, Fred D.
23c6fb40-2ece-4ff8-856e-a6fa858467c5
Culver, R. Lee
cc203f09-36c7-457f-b909-c5ecb96bcdb8
Coles, David
de60477c-eb71-49e0-8038-5d2d030aa053
Leighton, Timothy
3e5262ce-1d7d-42eb-b013-fcc5c286bbae

Park, J. Daniel, Holt, Fred D., Culver, R. Lee, Coles, David and Leighton, Timothy (2010) Measurement and analysis of array gain degradation due to bubble scattering. Journal of the Acoustical Society of America, 127 (3), part 2, 1817-1818. (doi:10.1121/1.3384194).

Record type: Article

Abstract

When an array is steered in the direction of a signal, array gain (AG) is maximum when the signal is coherent across the array, meaning that the signals add in phase for all elements and the noise or interference is incoherent across the array (i.e., it adds with random phase). For an acoustic array operating in the ocean, we would like to understand the degree to which scattering by nearby bubbles degrades AG. Bubble attenuation can also degrade array performance by attenuating the signal of interest, but that is separate from AG degradation. The degradation of AG due to scattering by nearby bubbles has been measured for different bubble densities. We have analyzed the relationship between bubble density at the array and the degradation in AG. We present probability density functions (pdfs) of signal amplitude and phase at the array elements. The amplitude pdfs can be approximated as a Rayleigh–Rice distribution, and the phase pdfs follow the von Mises distribution. With independence assumed between amplitude and phase distributions, simulated distributions generate array gain distributions closely matching the measured AG distribution

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More information

Published date: 2010
Venue - Dates: conference; 2009-01-01, 2010-01-01

Identifiers

Local EPrints ID: 188635
URI: http://eprints.soton.ac.uk/id/eprint/188635
ISSN: 0001-4966
PURE UUID: 4256abb8-2c1f-4e96-bc4e-862622508eb4
ORCID for Timothy Leighton: ORCID iD orcid.org/0000-0002-1649-8750

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Date deposited: 26 May 2011 11:02
Last modified: 15 Mar 2024 02:45

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Contributors

Author: J. Daniel Park
Author: Fred D. Holt
Author: R. Lee Culver
Author: David Coles

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