Spatio-Temporal Characterization of Bio-Acoustic Scatterers in Complex Media

Abstract

LONG TERM GOALS To develop a methodology for extracting the relevant spatial and temporal scales of bio-acoustic scatterers based on multi bi-static long-range measurements in shallow water waveguides. OBJECTIVE Characterization of biologically-induced ocean reverberation features is key to effectively parametrize acoustic models and thus ultimately improve the detection performance of long-range SONAR systems. Ocean reverberation signals measured in shallow water can be thought to result from the combined effect of both two-way multipath acoustic propagation and the intrinsic scattering function of compact (e.g. fish aggregates or submerged target) or extended (e.g. rough seabed) acoustic inhomogeneities. In particular, multipath effects in shallow water effectively yield multiple probing of the complex scattering function of fish aggregates or marine mammals. This complexity of the acoustic propagation and biological scattering prevents the use of conventional remote sensing techniques for mid-frequency long-range SONAR systems.

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Document Details

Document Type
Technical Report
Publication Date
Sep 30, 2011
Accession Number
ADA571701

Entities

People

  • Karim G. Sabra

Organizations

  • Georgia Tech

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acoustic Frequencies
  • Acoustic Propagation
  • Acoustic Scattering
  • Detection
  • Doppler Effect
  • Forward Scattering
  • Frequency
  • Frequency Response
  • Marine Mammals
  • Measurement
  • Physical Properties
  • Plane Waves
  • Remote Sensing
  • Reverberation
  • Scattering
  • Shallow Water
  • Waves

Readers

  • Marine Mammal Biology
  • Radar Systems Engineering.
  • Wave Propagation and Nonlinear Chaotic Dynamics.