Abstract
A shallow-water acoustic range 40 m deep has been investigated at a range of 33 km to determine the magnitude and temporal character of phase variations in the received signals. Variations sinusoidal in nature with peak-to-peak amplitude on the order of 20 cycles of the acoustic carrier were observed at the tidal periods. The phase of the received signal retarded during flood tide and advanced during ebb tide. Carrier frequencies of 1700 and 1704 Hz were employed in separate experiments conducted under mean sound velocities of 1470 and 1450 m/sec, respectively. The results of both tests demonstrate that there is a temporal scale of phase variability closely related to the tidal phenomena.
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