Removing Resonant Oscillation Signals from Swallow Float Data.

Abstract

Self-contained, freely-drifting Swallow floats capable of recording very low frequency (VLF) ambient ocean noise are under development at the Marine Physical Laboratory, Scripps Institution of Oceanography, San Diego, California. The floats are ballasted to neutral buoyancy at a desired depth, whereupon they record the components of particle velocity, from which sound pressure levels may be derived. A high frequency acoustic mutual interrogation system is incorporated to provide float positions, permitting the combination of data from an array of floats. Consecutive records are averaged together to produce an estimate of the float's resonant oscillation signal. The resonant oscillation signal estimate is then correlated with each record to yield a weighting coefficient, and the weighted signal subtracted from the record. The method was applied to three of the four deployment floats, and it significantly attenuated resonant oscillation signals between 0.36 Hz and 6.1 Hz. Keywords: Swallow floats; Ambient ocean noise; Resonant oscillation.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1987
Accession Number
ADA188895

Entities

People

  • G. L. Edmonds
  • R. L. Culver
  • V. C. Anderson
  • William Hodgkiss

Organizations

  • Scripps Institution of Oceanography

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Ambient Noise
  • Automatic Gain Control
  • Background Noise
  • California
  • Classification
  • Coefficients
  • Deployment
  • Dynamic Range
  • Frequency
  • Measurement
  • Military Research
  • Noise
  • Oceanography
  • Recording Systems
  • Sound Pressure
  • Tape Recorders
  • Very Low Frequency

Readers

  • Approximation Theory.
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Oceanography.