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Moving source ocean acoustic tomography with uncertainty quantification using controlled source-tow observations.

Kay L Gemba1, Heriberto J Vazquez1, Jit Sarkar1

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This summary is machine-generated.

This study uses travel-time tomography with a moving source to estimate ocean sound speed and its uncertainty. A moving source provides better ray diversity, reducing uncertainty compared to a fixed source.

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Area of Science:

  • Oceanography
  • Acoustics
  • Geophysics

Background:

  • Accurate ocean sound speed profiles are crucial for underwater acoustics and navigation.
  • Traditional tomography methods can be limited by source and receiver positioning uncertainties.

Purpose of the Study:

  • To estimate ocean sound speed and its uncertainty using travel-time tomography with a moving source.
  • To evaluate the impact of source movement on the accuracy of sound speed estimation.

Main Methods:

  • Utilized travel-time tomography with two vertical line arrays and a towed linear frequency modulated source.
  • Developed an inversion model accounting for uncertainties in source/receiver positions and velocities.
  • Performed simulations to compare moving versus fixed source tomography.

Main Results:

  • Successfully estimated ocean sound speed and uncertainty at ranges up to 2 km in 600 m water depth.
  • Demonstrated that moving source tomography reduces posterior sound speed uncertainty compared to fixed source.
  • Validated estimates through position parameter inversion and cross-validation of arrival times.

Conclusions:

  • Moving source tomography offers improved accuracy for ocean sound speed estimation.
  • Careful evaluation and minimization of representational error are critical for short-range tomography.
  • The method provides valuable insights into underwater acoustic environments.