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Numerical simulation of optimal deconvolution in a shallow-water environment

Numerical simulation of optimal deconvolution in a shallow-water environment
Numerical simulation of optimal deconvolution in a shallow-water environment
A fast technique for deconvolving signals in a dispersive multipath shallow-water environment using inverse filters is compared with the more commonly used deconvolution technique of time reversal (also known as phase conjugation). The objective of such techniques is to improve the accuracy of sound transmission from a source array to some receiving space. Time reversal provides benefits in this regard but here the additional performance that can be gained from inverse filters is examined. Several strategies for obtaining a set of inverse filters are discussed, each aimed at improving the accuracy of the reconstruction of the desired time signals through inverse techniques. It will be shown that an "optimal" inversion (in the sense of achieving a flat system response in the frequency domain) does not necessarily achieve a realizable time domain filter. A fast field model (using OASES) of the Giglio Basin shallow-water test facility is used as the basis for evaluating the various focusing strategies for single receiver locations. It will be seen that inverse filter arrays provide enhanced temporal and spatial focusing when compared to time reversal arrays. In addition, inverse filtering allows multiple receivers to be used, thereby increasing bandwidth or improving redundancy.
0001-4966
170-185
Cazzolato, Ben S.
556168d0-091e-4178-8fea-1718a51aa1d2
Nelson, Philip A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Joseph, Phillip F.
9c30491e-8464-4c9a-8723-2abc62bdf75d
Brind, Richard J.
4a574076-375c-4718-a853-0e2835b94031
Cazzolato, Ben S.
556168d0-091e-4178-8fea-1718a51aa1d2
Nelson, Philip A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Joseph, Phillip F.
9c30491e-8464-4c9a-8723-2abc62bdf75d
Brind, Richard J.
4a574076-375c-4718-a853-0e2835b94031

Cazzolato, Ben S., Nelson, Philip A., Joseph, Phillip F. and Brind, Richard J. (2001) Numerical simulation of optimal deconvolution in a shallow-water environment. Journal of the Acoustical Society of America, 110 (1), 170-185. (doi:10.1121/1.1379081).

Record type: Article

Abstract

A fast technique for deconvolving signals in a dispersive multipath shallow-water environment using inverse filters is compared with the more commonly used deconvolution technique of time reversal (also known as phase conjugation). The objective of such techniques is to improve the accuracy of sound transmission from a source array to some receiving space. Time reversal provides benefits in this regard but here the additional performance that can be gained from inverse filters is examined. Several strategies for obtaining a set of inverse filters are discussed, each aimed at improving the accuracy of the reconstruction of the desired time signals through inverse techniques. It will be shown that an "optimal" inversion (in the sense of achieving a flat system response in the frequency domain) does not necessarily achieve a realizable time domain filter. A fast field model (using OASES) of the Giglio Basin shallow-water test facility is used as the basis for evaluating the various focusing strategies for single receiver locations. It will be seen that inverse filter arrays provide enhanced temporal and spatial focusing when compared to time reversal arrays. In addition, inverse filtering allows multiple receivers to be used, thereby increasing bandwidth or improving redundancy.

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Published date: July 2001

Identifiers

Local EPrints ID: 10208
URI: https://eprints.soton.ac.uk/id/eprint/10208
ISSN: 0001-4966
PURE UUID: 3eb0eb52-2b93-44ec-85ec-9a2b3aacac63

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Date deposited: 22 Feb 2005
Last modified: 17 Jul 2017 17:07

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Contributors

Author: Ben S. Cazzolato
Author: Richard J. Brind

University divisions

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