Estimation of Bottom Scattering Strength from Measured and Modeled AN/SQS-53C Reverbation Levels.

Abstract

Hamilton type geoacoustic models were developed for Area Foxtrot, a NUWC test bed for emerging active sonar systems where the surface sediment type is highly spatially variable. Reverberation levels (RL) were modeled using the FEPE propagation model to augment the GSM propagation model because the bottom loss model in GSM did not estimate transmission loss accurately in shallow water. FEPE estimates reveal there is over a 15 dB difference between TL for sand and silt-clay sediments in Area Foxtrot. The comparison between modeled RL and measured RL (from a 1991 ASW exercise conducted by MUWC) enabled bottom scattering strength kernels to be developed for Area Foxtrot Bottom scattering strength was found to be a function of sediment type. Hard sand sediment has a bottom scattering strength which obeys Lambert's law (sin2 (theta)) while that of silt clay sediment is consistent with volume scattering (sin (theta)). The RLs in Area Foxtrot are azimuth-dependent and are a function of TL and bottom scattering strength (and hence bottom sediment type). Sonar beams steered towards the hard sand show higher

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1995
Accession Number
ADA303052

Entities

People

  • Gary A. Scanlon

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Phenomena
  • Acoustic Properties
  • Acoustic Waves
  • Acoustics
  • Bottom Loss
  • Detection
  • Diffraction
  • Grain Size
  • Losses
  • National Security
  • Oceanography
  • Oceans
  • Scattering
  • Seabed
  • Shallow Water
  • Sonar
  • Transmission Loss

Readers

  • Acoustical Oceanography.
  • Geotechnical Engineering.
  • Virology (or Medical Virology).