A Model for the Doppler Spread of Backscattered Sound from a Composite Roughness Sea Surface

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1976
Accession Number
ADA026949

Entities

People

  • Herward Schwarze

Organizations

  • SACLANT ASW Research Centre

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Acoustic Frequencies
  • Acoustic Waves
  • Backscattering
  • Computers
  • Dispersion Relations
  • Doppler Effect
  • Frequency
  • Geometry
  • Grazing Angles
  • Nato
  • Plane Waves
  • Plastic Explosives
  • Power Series
  • Random Variables
  • Scattering
  • Surface Roughness
  • Two Dimensional

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Marine Hydrodynamics
  • Statistical inference.