Accession Number:

ADA571701

Title:

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

Descriptive Note:

Annual rept.

Corporate Author:

GEORGIA INST OF TECH ATLANTA SCHOOL OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

2011-09-30

Pagination or Media Count:

5.0

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.

Subject Categories:

  • Biology
  • Physical and Dynamic Oceanography
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE