Time-Varying, High-Frequency Bottom Backscattering

Abstract

Continuous wave signals at frequencies between 20 and 180 kHz were backscattered from a shallow-water ocean bottom. Even though the source and receiver were mounted on a stable platform, the short-range (50-300 ft) bottom backscattering envelopes exhibited significant amplitude variations that increased as the grazing angles became smaller. Evidence suggests that the oceanic fine structure caused frequency-dependent shifts in the location of the insonified bottom area. These small shifts resulted in changes in the bottom scattered ping-to-ping envelope structure.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1990
Accession Number
ADA233422

Entities

People

  • E. Kennedy
  • R. Ray
  • S. Stanic

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Acoustic Scattering
  • Acoustics
  • Amplitude
  • Backscattering
  • Buildings And Structures
  • Classification
  • Continuous Waves
  • Forward Scattering
  • Frequency
  • Grazing
  • Grazing Angles
  • Scattering
  • Seabed
  • Security
  • Shallow Water

Readers

  • Control Systems Engineering.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Wave Propagation and Nonlinear Chaotic Dynamics.