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Doppler Passive Fathometry.

Chris H Harrison1

  • 1Emeritus Scientist, Centre for Maritime Research and Experimentation, Viale San Bartolomeo 400, 19126 La Spezia, Italy.

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Summary
This summary is machine-generated.

This study introduces Doppler Passive Fathometry, a novel method to determine and compensate for array vertical velocity using ambient ocean noise. This advancement allows for sub-bottom profiling even with moving hydrophone arrays.

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Area of Science:

  • Ocean acoustics
  • Geophysical signal processing

Background:

  • Passive fathometry uses ambient ocean noise for sub-bottom profiling.
  • Existing methods are limited by array motion, which can corrupt data.

Purpose of the Study:

  • To extend passive fathometry to determine and compensate for array vertical velocity.
  • To enable sub-bottom profiling with unknown, arbitrary array motion.

Main Methods:

  • Developed Doppler Passive Fathometry by analyzing Doppler shifts between direct and reflected sound paths.
  • Utilized cross-correlation of ambient noise across a hydrophone array.
  • Applied to experimental data with known periodic array motion.

Main Results:

  • Successfully determined and compensated for vertical array velocity (peak ~±1 m/s).
  • Demonstrated compensation enables continuous time integration for sub-bottom profiling.
  • Vertical velocity was found to be 90° out of phase with depth, consistent with periodic motion.

Conclusions:

  • Doppler Passive Fathometry overcomes limitations of array motion in passive fathometry.
  • The technique allows for sub-bottom profiling with moving arrays.
  • Implies potential for determining the range of moving targets using noise correlation.