Abstract
Amplitude fluctuations of surface-reflected signals from a source at 50-ft depth were recorded by two receivers at 2600 fathoms. Some features of the observations are attributed to ocean-wave focusing effects. It is shown that the signal-amplitude distribution may be described by using a Rayleigh distribution modified by adding a single, focused contribution of random phase. An observed delay in the envelope of the signals recorded by the two receivers that is greater than the wavefront delay is explained as resulting from the sweeping action of an acoustic caustic produced by the ocean waves. Auto- and cross-correlation functions were computed from the data.
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