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Passive fathometer processing.

Peter Gerstoft1, William S Hodgkiss, Martin Siderius

  • 1Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 92093-0238, USA.

The Journal of the Acoustical Society of America
|March 19, 2008
PubMed
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Ocean acoustic noise processing can reveal seabed layers using array techniques. This method, when using velocity sensors, significantly reduces the need for dense arrays, potentially requiring only one sensor.

Area of Science:

  • Oceanography
  • Acoustics
  • Geophysics

Background:

  • Ocean acoustic noise is a viable source for extracting geophysical information.
  • Previous studies demonstrated passive arrays as effective fathometers using noise array-processing techniques.

Purpose of the Study:

  • To derive and analyze the extraction of seabed layering information from ocean acoustic noise.
  • To investigate the application of noise array-processing techniques in both frequency and time domains.

Main Methods:

  • Processing ocean acoustic noise using array techniques in the frequency and time domains.
  • Analyzing the resulting reflection sequence to identify seabed layering.
  • Comparing the effectiveness of pressure sensors versus velocity sensors for array spacing requirements.

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Main Results:

  • The reflection sequence derived from noise processing allows for the extraction of seabed layering.
  • Vertically propagating noise contains crucial bottom information.
  • Using velocity sensors relaxes array spacing requirements, with simulations indicating one vertical velocity sensor may suffice.

Conclusions:

  • Ocean acoustic noise processing offers an efficient method for seabed characterization.
  • Velocity sensors present a significant advantage in reducing array density for seabed acoustic surveys.