A Model for the Doppler Spread of Backscattered Sound from a Composite Roughness Sea Surface
SACLANT ASW RESEARCH CENTRE LA SPEZIA (ITALY)
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A theoretical model for the doppler spread of backscattered acoustic waves from the rough sea surface is described on the basis of a two component structure facet model of the sea surface. The facet statistics are derived for a general gaussian sea surface. The results are evaluated for a Pierson- Moskowitz spectrum. A procedure for choosing the facet length is developed. Approximate, simple formulae for the Pierson-Moskowitz case are given. The general result for the doppler spread of the backscattered acoustic wave is evaluated for a sea surface spectrum due to Scott and examples for doppler spectra are given for different windspeeds, wind directions, grazing angles and acoustic frequencies.
- Acoustic Detection and Detectors