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Environmental inversion using high-resolution matched-field processing.

Cristiano Soares1, Sérgio M Jesus, Emanuel Coelho

  • 1Institute for Systems and Robotics, Universidade do Algarve, Campus de Gambelas, PT-8005-139 Faro, Portugal. csoares@ualg.pt

The Journal of the Acoustical Society of America
|February 6, 2008
PubMed
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This study introduces high-resolution processors to improve acoustic inversion convergence for free-drifting systems. These methods enhance meta-heuristic search accuracy by reducing sidelobes, crucial for accurate environmental parameter estimation.

Area of Science:

  • Ocean acoustics
  • Signal processing
  • Geophysical inversion

Background:

  • Experimental acoustic data collection faces challenges with free-drifting systems and limited receivers.
  • Reduced spatial coverage leads to ill-conditioned inverse problems and difficulties in parameter estimation due to sidelobes.
  • Meta-heuristic global search methods struggle with convergence in complex acoustic inversion problems.

Purpose of the Study:

  • To propose broadband high-resolution processors to improve convergence in acoustic inversion.
  • To address the challenge of poor vertical structure sampling caused by limited acoustic receivers.
  • To enhance the accuracy of environmental parameter estimation using meta-heuristic techniques.

Main Methods:

  • Development and application of broadband high-resolution processors.

Related Experiment Videos

  • Comparative study using simulated and experimental field data.
  • Utilizing meta-heuristic techniques for global search in multidimensional spaces.
  • Evaluation against the conventional Bartlett processor and exhaustive search.

    • Main Results:

    • High-resolution methods did not outperform the Bartlett processor with exhaustive search for parameter pinpointing.
    • High-resolution methods significantly improved convergence when used with meta-heuristic techniques.
    • Reduced uncertainty in the final environmental parameter estimates was observed.
    • Validation on experimental data from the Maritime Rapid Environmental Assessment 2003 sea trial.

    Conclusions:

    • Broadband high-resolution processors are effective in improving meta-heuristic convergence for acoustic inversion.
    • These methods mitigate issues arising from limited spatial sampling in free-drifting systems.
    • The findings contribute to more reliable environmental acoustic field characterization.