Weakly dispersive modal pulse propagation in the North Pacific Ocean

TitleWeakly dispersive modal pulse propagation in the North Pacific Ocean
Publication TypeJournal Article
Year of Publication2013
AuthorsUdovydchenkov I.A, Brown M.G, Duda T.F, Worcester P.F, Dzieciuch M.A, Mercer J.A, Andrew R.K, Howe B.M, Colosi J.A
JournalJournal of the Acoustical Society of America
Date Published2013/10
Type of ArticleArticle
ISBN Number0001-4966
Accession NumberWOS:000330119700085

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.

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