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Adaptive passive fathometer processing.

Martin Siderius1, Heechun Song, Peter Gerstoft

  • 1Department of Electrical and Computer Engineering, Portland State University, Portland, Oregon 97201, USA.

The Journal of the Acoustical Society of America
|April 8, 2010
PubMed
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A new passive fathometer technique images seabed layers using ocean ambient noise. Adaptive beamforming significantly improves upon conventional methods for practical seabed imaging.

Area of Science:

  • Ocean acoustics
  • Geophysical imaging
  • Signal processing

Background:

  • Seabed imaging traditionally uses active sonar, requiring dedicated sound sources.
  • Ocean ambient noise offers a passive, readily available acoustic source for geophysical exploration.

Purpose of the Study:

  • To describe and evaluate adaptive beamforming methods for passive fathometry.
  • To demonstrate the improvements of adaptive techniques over conventional beamforming for seabed layer imaging.

Main Methods:

  • Utilized ocean ambient noise, primarily from breaking waves, as the acoustic source.
  • Employed cross-correlation of surface noise with seabed echoes to determine travel times.
  • Applied conventional and adaptive beamforming with a vertical hydrophone array to isolate seabed reflections and reduce interference.

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Main Results:

  • Adaptive beamforming techniques demonstrated significant improvements in passive fathometry.
  • The methods were applied to multiple datasets, validating their effectiveness compared to conventional processing.
  • Reduced averaging times and enhanced signal clarity were observed with adaptive methods.

Conclusions:

  • Adaptive beamforming is a superior approach for passive fathometry, enabling more practical and effective seabed imaging.
  • This technique offers a promising alternative for exploring subsurface ocean structures.