Church Anchor Ambient Noise Final Report

Abstract

Omnidirectional ambient noise intensity measurements obtained in the CHURCH ANCHOR Exercise area, the eastern quarter of the Pacific north of 20 degrees N, during September 1973, are discussed as a function of time, depth, frequency, and location. The measurement platforms used were: (1) three ACODAC systems, each with six vertically distributed omnidirectional hydrophones; (2) the MPL vertical array consisting of 20 hydrophones distributed in six depth groups; and (3) the six-element horizontal MESA array. In the mean, the ambient noise intensity indicated a trend of decreasing level with increasing depth. The rate of change of ambient noise intensity with depth appeared to be significantly greater at the lower frequencies (50 Hz) than at the higher frequencies (250 Hz), and the rate of change for all frequencies was steeper between the critical depth and the bottom than between the axis and critical depth.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1975
Accession Number
ADC070512

Entities

People

  • A. Kirst Jr.
  • J. Hoffmann

Organizations

  • Texas Instruments

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Acoustic Measurement
  • Acoustic Propagation
  • Acoustics
  • Data Acquisition
  • Data Processing
  • Detectors
  • Frequency Bands
  • Laboratory Equipment
  • Measurement
  • Noise
  • Observation
  • Oceanography
  • Plastic Explosives
  • Security
  • Ship Signatures
  • Sound Pressure
  • Spectra

Readers

  • Image Processing and Computer Vision.
  • Mathematics or Statistics
  • Oceanography.