### ASA 125th Meeting Ottawa 1993 May

## 4pAO2. Statistical characteristics of bistatic surface scatter.

**Peter D. Neumann
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*Grad. Prog. in Acoust., Penn State Univ., P.O. Box 30, University Park, PA
16804
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**R. Lee Culver
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*Penn State Univ., University Park, PA 16804
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The statistical characteristics of the envelopes of bistatic surface
reverberation data taken in January 1992 are compared against the Rayleigh
distribution. Agreement with some slight deviations from Rayleigh behavior was
found in the statistical characteristics of the data for all available wind
speeds (1.4 to 7.2 m/s) at frequencies from 20 to 40 kHz. Additionally, the
data were divided in time according to the dominant surface scattering
mechanism, surface roughness or bubble layer, and the statistical
characteristics of each of these portions examined for Rayleigh behavior. This
type of analysis allows for an increased amount of data to be used as a result
of using data not only from all of the transmitted pulses but also from a
number of different times in the time series instead of at a single time as was
done in the first part of the analysis. The statistical characteristics of
these portions of the time series were also found to be Rayleigh with only
slight deviations in the tails of the distribution. [Work supported by ONT.]