Abstract
The statistical properties of 68-Hz signals, as received at nominal ranges of 260 and 570 nmi, were calculated and compared to properties expected of a Gaussian channel. The received signal time series corresponded to cw transmissions from radial tows of 30 nmi centered at each of the nominal ranges. The projector was towed at a depth of 400 ft, and the receiving hydrophone was located at the reciprocal depth. The experiment was performed in July of 1979 at a location east of Bermuda. Our analysis of signal envelope and intensity statistics showed that: the density functions corresponded closely to exponential; that envelope level crossings were approximately Rayleigh distributed; and that the autocovariance of interest could be approximated from the radial tow speed of the projector and a Gaussian function with spatial coherence interval given by 89λ/Hkm, where λ is the sound wavelength and Hkm is the depth excess of the channel in kilometers. [Work supported by Naval Underwater Systems Center.]
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