Shallow Water Reverberation from a Time Reversed Mirror

Abstract

Modelling indicates that when the ocean boundaries are the dominant cause of revesberation, the signal-to-reverberation ratio at a target will be increased by generating a time-reversed signal from a vertical array. This occurs because the focusing; (1) increases the signal level at the target and (2) reduces the boundary illumination (hence reverberation). An experiment (as part of FAF99) was designed to study the latter (i.e., potential gain against reverberation) resulting from a 3.5 kHz time-reversed signal. Results show the extreme sensitivity of the gain to bathymetric variation and indicate the need for potentially high horizontal spatial resolution in the receive array.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2000
Accession Number
ADA389962

Entities

People

  • B. E. Mcdonald
  • Charles W. Holland

Organizations

  • SACLANT ASW Research Centre

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Fields
  • Anisotropy
  • Data Processing
  • Focal Planes
  • Frequency
  • Gain
  • Losses
  • Measurement
  • Nato
  • Physical Properties
  • Reverberation
  • Scattering
  • Shallow Water
  • Shape
  • Societies
  • Time Domain
  • Transmission Loss

Readers

  • Acoustical Oceanography.
  • Phased Array Antenna Design.