Abstract
Monostatic and bistatic reverberation of highly resolved signals from very rough bottoms at one site is statistically analyzed. Scattering at a mean frequency of about 230 Hz from a large number of bottom footprints is considered. The reverberation envelope is found to be non-Rayleigh, with the degree of departure from Rayleigh dependent upon the bottom grazing angle for two cases considered, θg≈5° and 40°, and upon the bistatic angle in the entire range, φ≈0° to 180°. These rough bottom observations can be explained by adopting a continuous scattering model having a Rayleigh envelope, added to a discrete scattering model (arising from a small number of individual features within the sonar footprint) having a distinctly non-Rayleigh envelope. These models, plus a heuristic mechanism of self-selection within the discrete scattering model, arguably explain the observed angle dependence of the reverberation statistics.
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