Accession Number : ADA314014

Title :   Some Shallow Water Inferences from the Celtic Duet Experiment,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB

Personal Author(s) : Preston, J. R. ; McCammon, D. F. ; Desharnais, F. ; Ellis, D. D.

PDF Url : ADA314014

Report Date : 28 AUG 1996

Pagination or Media Count : 20

Abstract : Scattering strength estimates are made for selected CW (Continuous Wave) and HFM (Hyperbolic Frequency Modulation) pulses of different lengths. Three shallow water experiment areas of the 1992 Celtic Duet experiment of the southwest approaches are discussed. These include a site with a more complex mixture of sand, chalk, and limestone, a site with mostly sand (and sand waves), and a site with mostly chalk. Examples of the spatial character of the reverberation are presented. Comparisons of reverberation data with GSM (Generic Sonar Model) runs are discussed. Statistics of selected reverberation beam time series are compared with a pure Rayleigh distribution. One way signal spreading using OASES (Ocean Acoustics and Seismic Exploration Synthesis) broadband modeling predictions are discussed and inferences for two way reverberation are made.

Descriptors :   *ACOUSTIC SCATTERING, *REVERBERATION, *UNDERWATER ACOUSTICS, SPATIAL DISTRIBUTION, TOWED ARRAYS, STATISTICAL INFERENCE, FREQUENCY MODULATION, CONTINUOUS WAVES, TIME SERIES ANALYSIS, SHALLOW WATER, GEOACOUSTICS, BATHYMETRY, RAYLEIGH SCATTERING, ACOUSTIC MEASUREMENT, SOUND WAVES, ACOUSTIC DATA, SONAR SIGNALS, SONAR RECEIVERS, TRANSMISSION LOSS, SONAR ARRAYS, ENGLISH CHANNEL.

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE