Phase and Amplitude Fluctuations in Propagating through a Layered Ocean

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Abstract
A propagation experiment was conducted over a 25‐mile wholly refracted (RRR) path for 48 h in October 1967. The data recorded during the experiment consisted of both the arrival time and the amplitude of acoustic pulses at 11 vertically spaced hydrophones. The source and the receivers were fixed, and the medium was sampled every tenth of an hour with a 10‐msec pulse at 800 Hz. The propagation path between source and receiver was purely refractive and amounted to a complete cycle of RRR type of propagation. The means, variances, autocorrelation, autospectral density, cross correlation, and coherence function were estimated for both the amplitude and phase data. The probability distribution function for both amplitude and phase is demonstrated to be nearly Gaussian. An interrelationship between the time and space characteristics of the random inhomogeneities of the medium is illustrated. Wherever possible, the measured results are compared with the theoretical values of Chernov (1960). A comparison of the theory, which is based on a statistically homogeneous medium, with the measured values, obtained in a layered medium, is discussed.

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