Transmission time variability, vertical spatial and temporal analysis of NAPOLI '85, an experiment in the Tyrrhenian Sea

Abstract

The performance of sonar systems is affected by sound-speed variability in the ocean, which frequently takes the form ofpatches of water with relatively high or low sound-speed. These patches sometimes focus the sound and at other times de-focus the sound, depending on the positions of source and receiver with respect to the patches, which may be randomly distributed. This focusing and de-focusing results in submarine detection where it would not normally be obtained and loss of target respectively. A unified approach or a theory which explains all the physics of the phenomena does not yet exist.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1989
Accession Number
AD1114336

Entities

People

  • B. J. Uscinski
  • J. R. Potter
  • T. Akal

Organizations

  • SACLANT ASW Research Centre

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms
  • Materials and Manufacturing Processes
  • Sensors

DTIC Thesaurus Topics

  • Acoustic Frequencies
  • Acoustic Measurement
  • Acoustic Propagation
  • Acoustics
  • Broadband
  • Cross Correlation
  • Data Analysis
  • Data Science
  • Detection
  • Frequency
  • Frequency Bands
  • Geometry
  • Identification
  • Information Science
  • Integrals
  • Internal Waves
  • Measurement
  • Modulation
  • Phase Modulation
  • Refractive Index
  • Travel Time
  • Two Dimensional
  • Tyrrhenian Sea

Readers

  • Oceanography.
  • Regression Analysis.
  • Wave Propagation and Nonlinear Chaotic Dynamics.