Single-mode excitation in the shallow-water acoustic channel using feedback control

The shallow-water acoustic channel supports far-field propagation in a discrete set of modes. Ocean experiments have confirmed the modal nature of acoustic propagation, but no experiment has successfully excited only one of the suite of mid-frequency trapped modes propagating in a coastal environmen...

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Bibliographic Details
Published in:IEEE journal of oceanic engineering 1997-04, Vol.22 (2), p.281-291
Main Authors: Buck, J.R., Preisig, J.C., Johnson, M., Catipovic, J.
Format: Article
Language:English
Subjects:
Acoustic propagation
Adaptive estimation
Array signal processing
Brackish
Character generation
Control theory
Feedback control
Freshwater
Marine
Oceans
Power generation
Sea measurements
Underwater acoustics
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Summary:The shallow-water acoustic channel supports far-field propagation in a discrete set of modes. Ocean experiments have confirmed the modal nature of acoustic propagation, but no experiment has successfully excited only one of the suite of mid-frequency trapped modes propagating in a coastal environment. The ability to excite a single mode would be a powerful tool for investigating shallow-water ocean processes. A feedback control algorithm incorporating elements of adaptive estimation, underwater acoustics, array processing, and control theory to generate a high-fidelity single mode is presented. This approach also yields a cohesive framework for evaluating the feasibility of generating a single mode with given array geometries, noise characteristics, and source power limitations. Simulations and laboratory wave guide experiments indicate the proposed algorithm holds promise for ocean experiments.
ISSN:0364-9059
1558-1691
DOI:10.1109/48.585947