Abstract
A ray approach is used to model transmission fluctuations for a 7-NM propagation path in the Straits of Florida. The model is based on simplifying restrictions consistent with the following assumptions: (1) Transmission fluctuations on the time scale of a few minutes and longer are attributable to time-dependent multipath interference effects. These effects are associated with variations in the channel of spatial scale larger than the source to receiver separation. (2) The bottom contributes significantly to the mean loss but insignificantly to fluctuations. For transmission loss, comparison with experiment is made on the basis of smoothed spectra, covering fluctuation periods of a few minutes to many days. The agreement is good. Time series of observed and computed phase, treated as a variable continuous over multiplets of 2π radians, also show favorable agreement. [Work supported by Acoustics Programs, Office of Naval Research.]
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