Synthetic Aperture Sonar Beam Forming in the Presence of Internal Waves

Abstract

The long term goal of our research is to incorporate environmental estimation and compensation methods into the synthetic aperture sonar (SAS) image formation process. Specifically mitigate shallow water environmental effects causing a degradation in image resolution through space/time variations in the sound speed field, e.g., internal waves, turbulence, bathymetry. The current focus of our research is to develop an algorithm to compensate for the effects of linear internal waves during the formation of a synthetic aperture in a shallow water environment. Internal waves impact the propagation of the acoustic signal and consequently the phase by changing the space time structure of the sound speed field. Our intent is to model this phase change due to internal waves, with the challenge of developing a methodology to remove this internal wave induced phase variation as a part of the formation of the synthetic aperture.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1998
Accession Number
ADA538958

Entities

People

  • Joshua Eisenberg
  • Larry V. Johnson

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Signals
  • Acoustic Waves
  • Algorithms
  • Angle Of Arrival
  • Autocorrelation
  • Beam Forming
  • Compensation
  • Data Analysis
  • Frequency
  • Internal Waves
  • Refraction
  • Shallow Water
  • Sonar
  • Synthetic Aperture Sonar
  • Wave Propagation
  • Waves

Fields of Study

  • Physics

Readers

  • Coastal Oceanography
  • Image Processing and Computer Vision.

Technology Areas

  • Space
  • Space - Space Objects