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High-resolution bottom-loss estimation using the ambient-noise vertical coherence function.

Lanfranco Muzi1, Martin Siderius1, Jorge E Quijano2

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Summary
This summary is machine-generated.

This study enhances ocean acoustic transmission loss prediction by improving seabed reflection loss estimation. A new method uses ambient noise spatial coherence for higher angular resolution, benefiting underwater acoustic modeling.

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Area of Science:

  • Ocean acoustics
  • Underwater acoustics
  • Seismic signal processing

Background:

  • Seabed reflection loss is critical for predicting underwater acoustic transmission loss.
  • Passive acoustic techniques using ambient noise offer a method for estimating seabed reflection loss.
  • Conventional beamforming with vertical line arrays has limitations in angular resolution for short arrays.

Purpose of the Study:

  • To derive the bottom reflection coefficient from the ambient-noise spatial coherence function.
  • To develop a technique for higher angular resolution seabed loss estimation.
  • To address limitations of conventional beamforming in passive acoustic methods.

Main Methods:

  • Derivation of the bottom reflection coefficient from ambient-noise spatial coherence.
  • Exploitation of the spatial stationarity of the ambient-noise spatial coherence function.
  • Application of the developed technique to simulated and experimental data.

Main Results:

  • A novel technique for estimating seabed reflection loss with enhanced angular resolution was developed.
  • The method successfully improved the resolution of bottom loss estimation compared to conventional beamforming.
  • Demonstrated effectiveness on both simulated and real-world experimental acoustic data.

Conclusions:

  • The derived technique offers improved angular resolution for seabed reflection loss estimation.
  • This advancement is crucial for accurate underwater acoustic transmission loss prediction.
  • The method shows promise for practical applications in oceanographic and naval acoustics.