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Weakly dispersive modal pulse propagation in the North Pacific Ocean

Author:
Udovydchenkov, Ilya A.  Brown, Michael G.  Duda, Timothy F.  Worcester, Peter F.  Dzieciuch, Matthew A.  Mercer, James A.  Andrew, Rex K.  Howe, Bruce M.  Colosi, John A.  


Journal:
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA


Issue Date:
2013


Abstract(summary):

The propagation of weakly dispersive modal pulses is investigated using data collected during the 2004 long-range ocean acoustic propagation experiment (LOAPEX). Weakly dispersive modal pulses are characterized by weak dispersion-and scattering-induced pulse broadening; such modal pulses experience minimal propagation-induced distortion and are thus well suited to communications applications. In the LOAPEX environment modes 1, 2, and 3 are approximately weakly dispersive. Using LOAPEX observations it is shown that, by extracting the energy carried by a weakly dispersive modal pulse, a transmitted communications signal can be recovered without performing channel equalization at ranges as long as 500 km; at that range a majority of mode 1 receptions have bit error rates (BERs) less than 10%, and 6.5% of mode 1 receptions have no errors. BERs are estimated for low order modes and compared with measurements of signal-to-noise ratio (SNR) and modal pulse spread. Generally, it is observed that larger modal pulse spread and lower SNR result in larger BERs. (C) 2013 Acoustical Society of America.


Page:
3386---3394


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