Ambient Sea Noise Directionality: Measurement and Processing

Abstract

The fundamental relationships between acoustic array parameters and the noise field are reviewed to establish the connection among the various processing techniques for estimation of the ambient-sea-noise directionality. The analyses, based on the concept of multidimensional space, conclude that basic information about the ambient-sea-noise directionality can be obtained directly from the cross-spectral matrix of the array's hydrophone outputs. The angular resolution of the processed noise field depends on the array structure, the stationarity of the noise field, and the precision in numerical computation. The cross-spectral data can also be used to indicate the dominant coherent noise sources in a certain multidimensional representation. Examples of a simulated noise field and actual sea data are illustrated for the directional AUTOBUOY.

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Document Details

Document Type
Technical Report
Publication Date
Feb 28, 1977
Accession Number
ADA038461

Entities

People

  • Nai-chyuan Yen

Organizations

  • Naval Underwater Systems Center

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Acoustics
  • Ambient Noise
  • Arrays
  • Communication Systems
  • Computations
  • Data Reduction
  • Eigenvalues
  • Equations
  • Frequency
  • Geometry
  • Measurement
  • New York
  • Numerical Analysis
  • Ocean Environments
  • Oceans
  • Plane Waves
  • Simultaneous Equations

Readers

  • Acoustical Oceanography.
  • Statistical inference.
  • Theoretical Analysis.

Technology Areas

  • Space