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Coherence extrapolation for underwater ambient noise.

Jorge E Quijano1, Stan E Dosso1, Martin Siderius2

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|June 9, 2014
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Summary
This summary is machine-generated.

This study simulates longer sensor array measurements by extrapolating vertical coherence of oceanic ambient noise. The method projects limited array noise coherence using prolate spheroidal wave functions for improved underwater acoustics analysis.

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Area of Science:

  • Oceanography
  • Acoustics
  • Signal Processing

Background:

  • Vertical coherence of oceanic ambient noise is crucial for array processing.
  • Limited aperture arrays restrict the simulation of larger sensor configurations.
  • Understanding noise coherence aids in underwater acoustic system design.

Purpose of the Study:

  • To develop and evaluate a method for extrapolating vertical coherence of surface-generated oceanic ambient noise.
  • To simulate measurements from longer sensor arrays using data from shorter ones.
  • To assess the performance of this extrapolation technique on simulated and experimental data.

Main Methods:

  • Projection of noise coherence onto a basis of prolate spheroidal wave functions.
  • Utilizing array parameters and noise frequency to define the orthogonal basis.
  • Validation using simulated data from multi-layered seabeds and experimental measurements.

Main Results:

  • The extrapolation method successfully simulates vertical coherence for longer arrays.
  • Performance is evaluated against ground truth simulated data.
  • The technique is demonstrated as applicable to real-world experimental data.

Conclusions:

  • The proposed extrapolation method is effective for simulating longer sensor array measurements.
  • This technique enhances the capability to analyze oceanic ambient noise.
  • It offers a valuable tool for underwater acoustic research and applications.