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The estimation of geoacoustic properties from broadband acoustic data, focusing on instantaneous frequency techniques

The estimation of geoacoustic properties from broadband acoustic data, focusing on instantaneous frequency techniques
The estimation of geoacoustic properties from broadband acoustic data, focusing on instantaneous frequency techniques
The compressional wave velocity and attenuation of marine sediments are fundamental to marine science. In order to obtain reliable estimates of these parameters it is necessary to examine in situ acoustic data, which is generally broadband. A variety of techniques for estimating the compressional wave velocity and attenuation from broadband acoustic data are reviewed. The application of Instantaneous Frequency (IF) techniques to data collected from a normal-incidence chirp profiler is examined. For the datasets examined the best estimates of IF are obtained by dividing the chirp profile into a series of sections, estimating the IF of each trace in the section using the first moments of the Wigner Ville distribution, and stacking the resulting IF to obtain a composite IF for the section. As the datasets examined cover both gassy and saturated sediments, this is likely to be the optimum technique for chirp datasets collected from all sediment environments.
298
University of Southampton, Institute of Sound and Vibration Research
Robb, G.B.N.
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White, P.R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Bull, J.M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Best, A.I.
cad03726-10f8-4f90-a3ba-5031665234c9
Leighton, T.G.
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Dix, J.K.
efbb0b6e-7dfd-47e1-ae96-92412bd45628
Robb, G.B.N.
ed4a87a1-b924-4d6b-af46-597d8fd3b642
White, P.R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Bull, J.M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Best, A.I.
cad03726-10f8-4f90-a3ba-5031665234c9
Leighton, T.G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Dix, J.K.
efbb0b6e-7dfd-47e1-ae96-92412bd45628

Robb, G.B.N., White, P.R., Bull, J.M., Best, A.I., Leighton, T.G. and Dix, J.K. (2002) The estimation of geoacoustic properties from broadband acoustic data, focusing on instantaneous frequency techniques (ISVR Technical Report, 298) Southampton, UK. University of Southampton, Institute of Sound and Vibration Research 40pp.

Record type: Monograph (Project Report)

Abstract

The compressional wave velocity and attenuation of marine sediments are fundamental to marine science. In order to obtain reliable estimates of these parameters it is necessary to examine in situ acoustic data, which is generally broadband. A variety of techniques for estimating the compressional wave velocity and attenuation from broadband acoustic data are reviewed. The application of Instantaneous Frequency (IF) techniques to data collected from a normal-incidence chirp profiler is examined. For the datasets examined the best estimates of IF are obtained by dividing the chirp profile into a series of sections, estimating the IF of each trace in the section using the first moments of the Wigner Ville distribution, and stacking the resulting IF to obtain a composite IF for the section. As the datasets examined cover both gassy and saturated sediments, this is likely to be the optimum technique for chirp datasets collected from all sediment environments.

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Published date: 2002

Identifiers

Local EPrints ID: 10284
URI: http://eprints.soton.ac.uk/id/eprint/10284
PURE UUID: cdac89d4-bcec-4d0a-ab5d-6636e420c127
ORCID for P.R. White: ORCID iD orcid.org/0000-0002-4787-8713
ORCID for T.G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750

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Date deposited: 13 Jun 2005
Last modified: 20 Nov 2021 02:37

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Contributors

Author: G.B.N. Robb
Author: P.R. White ORCID iD
Author: J.M. Bull
Author: A.I. Best
Author: T.G. Leighton ORCID iD
Author: J.K. Dix

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