Sonar Surveillance through a North Pacific Ocean Front

Abstract

This report considers the problem of detecting long-range, low- frequency, narrowband CW sources for sound transmission through ocean fronts. Sound propagation through the subarctic sound-speed front north of Hawaii was studied using PARKA I data. A new stochastic model of sound intensity was applied to the PARKA I front. This model introduces two new stochastic factors that modify deterministic sound propagation. Comparison of the stochastic with the deterministic sound intensity model showed that the two stochastic factors were necessary to account for sound propagation behavior in the frontal region. These stochastic factors showed that horizontal frontal sound-speed gradients have a pronounced effect upon the propagation of sound and, hence, the masking of sources by ocean fronts. Suggestions for measurements to better understand the masking of sources by fronts in the deep ocean are given.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1981
Accession Number
ADC026529

Entities

People

  • J. A. Neubert

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Acoustics
  • Bottom Loss
  • Deep Oceans
  • Environment
  • Frequency
  • Gain
  • Losses
  • Measurement
  • Military Research
  • North Pacific Ocean
  • Ocean Environments
  • Oceans
  • Pacific Ocean
  • Passive Surveillance
  • Standards
  • Surveillance
  • Test And Evaluation

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Oceanography.