Abstract
Transmission at 460 Hz between two moorings centered about 600 km east of Miami is scheduled for August 1988. The 10-day, 260-km experiment has been designed to measure fluctuations induced by ocean internal waves (IW). The use of a 64-element, 150-m vertical receiver array, 6/h pulse rate, and high bandwidth allows measurement of pulse travel time (phase) to a fraction of a carrier period, and allows estimation of phase and intensity coherence times and the vertically lagged correlation function of the acoustic field, including the rms vertical wave front tilt. Path-integral solutions of the parabolic wave equation yield predictions of these statistical properties. For the Garrett-Munk IW model, rms travel-time predictions are 2–6 ms, and rms vertical angle predictions are 0.2–0.7 deg, with the lowest values for shallow turning rays and the largest for near axial rays. Expected phase coherence time scale is 5 min., with intensity time scale varying between 1 and 30 min., indicating the presence of both partially and fully saturated rays. These quantities yield a depth-dependent measure of rms vertical IW displacement, and some information about the IW spectrum.
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