Abstract
Fluctuations in acoustic propagation as seen in data collected during the SWARM 95 experiment are analyzed and related to the oceanographic environment. Acoustic data were collected on a 32 element vertical receiver array which spanned the 88 m water column from depths of 23 to 85 m. The receiver array was located 42 km seaward from two fixed acoustic projectors which transmitted a 224 Hz PRN signal (16 Hz bandwidth) and a 400 Hz PRN signal (100 Hz bandwidth). Intensity statistics, such as scintillation index (SI) and the probability distribution function (PDF), are discussed as a function of depth and time for narrow-band and broadband (replica correlation) processing. Broadband SI is shown to be less than the narrow-band SI which has a typical value of 2. The PDF is shown to be neither a Rayleigh nor a log-normal distribution and evidence is presented that unsaturated scattering processes are involved. [Work supported by the Office of Naval Research.]
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