Abstract
Underwater acoustic-communication experiments are being conducted in a 12×4×4-ft model tank equipped with a remote-controlled transducer-positioning system and a “sea-state” generator. The statistics of the various sea states are obtained by utilizing two waveheight indications. The output of these devices is instantaneous profiles of the surface at particular locations. The output of the waveheight indicators is digitized, recorded onto IBM magnetic tape, and analyzed on an IBM-1620 computer. Auto- and cross-correlation functions as a function of position are obtained for various modeled sea states. An advantage of the model tank is that it is possible to investigate any individual acoustic path desired without the confusion of multipaths that occur in typical real ocean channels. The path that we are investigating at this time is the single surface bounce. A train of constant-amplitude pulses, amplitude-modulating a 1-Mc/sec carrier, is reflected off the surface and the received wave is recorded. Using the same data-processing equipment described above, the correlation functions for the transmitted and received pulse trains are obtained for various “sea states.”
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