Path-Length Stability of the Ocean, Inferred from Ocean Temperature Measurements

Abstract

In an extensive ocean test at the Atlantic Undersea Test and Evaluation Center (AUTEC), fluctuations of acoustic path length were found to be no more than 0.001 meter rms for periods of 1 minute over a vertical path extending from an ocean depth of 60 to 320 meters. The measurements showed that the ocean is sufficiently stable to allow sophisticated coherent signal processing as would be necessary for synthetic aperture sonar at moderate frequencies (2OkHz). Path-length stability was inferred from continuous measurements of the ocean temperature profile determined by a 20-element temperature array suspended from a research vessel. Time-dependent temperature fluctuations remained after the recorded temperature was compensated for changes in depth of the array.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1974
Accession Number
AD0787509

Entities

People

  • D. W. Stowe
  • F. C. Paddison

Organizations

  • Johns Hopkins University

Tags

Communities of Interest

  • Materials and Manufacturing Processes
  • Sensors

DTIC Thesaurus Topics

  • Accuracy
  • Acoustic Signals
  • Classification
  • Data Analysis
  • Data Processing
  • Frequency
  • Internal Waves
  • Measurement
  • New York
  • Physics
  • Physics Laboratories
  • Pressure Gages
  • Sonar
  • Synthetic Aperture Sonar
  • Temperature Gradients
  • Test And Evaluation
  • Universities

Fields of Study

  • Environmental science

Readers

  • Ocean-Atmosphere Mesoscale Modeling, Data Assimilation, and Flux Boundary Layers
  • Spectroscopy.
  • Thermal Physics or Thermal Science.

Technology Areas

  • AI & ML
  • AI & ML - Autonomous Systems