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.
Single-mode excitation in the shallow-water acoustic channel using feedback control
Akustische Fernfeldausbreitung im küstennahen Meerwasser. Untersuchungsergebnisse zum akustischen Nachrichtenübertragungskanal mit Ein-Moden-Anregung und adaptiven Rückkopplungs-Algorithmus
IEEE Journal of Oceanic Engineering ; 22 , 2 ; 281-291
1997
11 Seiten, 28 Quellen
Article (Journal)
English
Unterwasserschall , akustische Übertragung , Nachrichtenübertragungstechnik , Algorithmus , Einmodenbetrieb , akustische Welle , Übertragungsfunktion , Rauscheigenschaft , modale Regelung , Versuchsergebnis , Schwingungsanregung , Meerwasser , adaptives System , Digitalsimulation , Rückkopplung , Nachrichtenmesstechnik , Schallausbreitung , Schallfeld , Simulation , Steuerung und Regelung , Flachwasser , Küstenvorfeld , Array-Abtastung
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