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

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4 Author(s)
Buck, J.R. ; Res. Lab. of Electron., MIT, Cambridge, MA, USA ; Preisig, J.C. ; Johnson, M. ; Catipovic, J.

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

Published in:

Oceanic Engineering, IEEE Journal of  (Volume:22 ,  Issue: 2 )

Date of Publication:

Apr 1997

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