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. 2014 Jan 6;14(1):795–833. doi: 10.3390/s140100795

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© 2014 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 1. — Narrow-band signal-to-noise ratio (SNR; 1/(AN)) as a function of frequency for varying transmission distance. Environmental factors used: practical spreading, k = 1.5; wind speed, w = 3 m/s; and moderate shipping activity, s = 0.5.