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Focalization: environmental focusing and source localization.

M D Collins1, W A Kuperman

  • 1Naval Research Laboratory, Washington, DC 20375.

The Journal of the Acoustical Society of America
|September 1, 1991
PubMed
Summary
This summary is machine-generated.

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Focalization processing simultaneously focuses and localizes underwater sound sources without needing prior environmental data. This advanced acoustic method incorporates environmental parameters directly into the search, proving feasible in simulations.

Area of Science:

  • Ocean acoustics
  • Signal processing
  • Geophysics

Background:

  • Conventional matched-field processing (MFP) relies heavily on precise ocean-acoustic environmental models.
  • Inaccurate environmental knowledge significantly degrades MFP performance.

Purpose of the Study:

  • To introduce focalization, a generalized matched-field processing technique.
  • To eliminate the stringent requirement for pre-existing ocean-acoustic environmental data.
  • To demonstrate the feasibility of focalization through numerical simulations.

Main Methods:

  • Focalization integrates environmental parameters into the search space, simultaneously focusing and localizing sources.
  • It employs high-resolution cost functions derived from ray and wave theories.

Related Experiment Videos

  • Environmental parametrization utilizes empirical orthogonal functions.
  • Optimization is performed using simulated annealing for global minimum identification.

    • Main Results:

    • Focalization successfully incorporates environmental variability into the processing.
    • Numerical simulations confirm the technique's ability to focus and localize sources.
    • The method bypasses the need for explicit environmental models.

    Conclusions:

    • Focalization offers a robust alternative to conventional MFP by directly handling environmental uncertainties.
    • This technique enhances source localization and focusing capabilities in complex ocean environments.
    • Focalization presents a significant advancement in underwater acoustic signal processing.