Doppler Statistics of Ocean Velocity Variability

Abstract

This report examines the returned acoustic signal fluctuations from the backscattering of particles embedded in a model ocean velocity microstructure field. Particular attention is given to the separate role of scatterer relative location. It is shown that the fourth-order statistic of the returned signal or, equivalently, the variance of the pulse-to-pulse returned complex signal correlation function contains information on the spatial structure of the fluid velocity correlation function. A key parameter in this relationship is the ratio of the spatial scale of the fluid velocity field to the along-range scale size of the scattering volume. A sensitivity analysis is performed on the theoretical results comparing the limits of performance of a coherent Doppler estimate of microstructure velocity with those of an estimate involving the use of the higher order statistical relationship, termed stochastic Doppler. Keywords: Underwater acoustics; Doppler sonar; Ocean velocity measurements.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1988
Accession Number
ADA211687

Entities

People

  • A. Jilling
  • L. Goodman

Organizations

  • Naval Underwater Systems Center

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Phenomena
  • Acoustic Propagation
  • Acoustic Scattering
  • Acoustics
  • Doppler Effect
  • Doppler Sonar
  • Frequency
  • Internal Waves
  • Measurement
  • Monostatic Sonar
  • Oceans
  • Remote Sensing
  • Repetition Rate
  • Scattering
  • Sonar
  • Time Intervals
  • Waves

Readers

  • Computational Modeling and Simulation
  • Fluid Dynamics.
  • Wave Propagation and Nonlinear Chaotic Dynamics.