An Analysis of High-Frequency Ambient Noise

Abstract

Because of the high values of absorption and bottom-reflection losses, ambient noise in shallow water at frequencies above 30 kHz is considered to result almost entirely from wind and rain activity at the local sea surface. The ambient noise is thus effectively produced by a series of small radiators distributed over a plane surface, with the level and directionality of the sources being dependent on wind speed, rainfall, and frequency. In order to assess the form of signal processing to use in a high-frequency ambient-noise field, analytical expressions have been developed for the noise power in an omnidirectional hydrophone, for the horizontal and vertical spatial correlation functions, and for the noise power in an unshaded rectangular array.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1982
Accession Number
ADA125308

Entities

People

  • Lewis J. Lloyd
  • Maurice J. Daintith

Organizations

  • SACLANT ASW Research Centre

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption Coefficients
  • Ambient Noise
  • Bessel Functions
  • Computer Programming
  • Computer Programs
  • Cross Correlation
  • Geometry
  • Hydrophones
  • Integrals
  • Nato
  • Noise
  • Omnidirectional
  • Radiation
  • Radiation Patterns
  • Shallow Water
  • Signal Processing
  • Test And Evaluation

Readers

  • Acoustical Oceanography.
  • Acoustics.
  • Phased Array Antenna Design.