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Estimation of modal group velocities with a single receiver for geoacoustic inversion in shallow water.

Authors
Type
Published Article
Journal
The Journal of the Acoustical Society of America
1520-8524
Publication Date
Volume
128
Issue
2
Pages
719–727
Identifiers
DOI: 10.1121/1.3459855
PMID: 20707442
Source
Medline
License
Unknown

Abstract

Due to the expense associated with at-sea sensor deployments, a challenge in underwater acoustics has been to develop methods requiring a minimal number of sensors. This paper introduces an adaptive time-frequency signal processing method designed for application to a single source-receiver sensor pair. The method involves the application of conjugate time-frequency warping transforms to improve the SNR and resolution of the time-frequency distribution (TFD) of the measured field. Such refined knowledge of the TFD facilitates efforts to extract tomographic information about the propagation medium. Here the method is applied to the case of modal propagation in a shallow ocean range independent environment to extract a refined TFD. Given knowledge of the source-receiver separation, the refined TFD is used to extract the frequency dependent group velocities of the individual modal components. The extracted group velocities are then incorporated into a computationally light tomographic inversion method. Simulated and experimental results are discussed.

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