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The matched-phase coherent multi-frequency matched-field processor

Orris1, Nicholas, Perkins

  • 1United States Naval Research Laboratory, Washington, DC 20375-5200, USA.

The Journal of the Acoustical Society of America
|June 1, 2000
PubMed
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A novel matched-phase coherent processor enhances underwater acoustic signal detection by determining unknown relative phases. This method improves performance and range resolution compared to existing techniques.

Area of Science:

  • Underwater acoustics
  • Signal processing
  • Array processing

Background:

  • Matched-field processing (MFP) is crucial for source localization in underwater acoustics.
  • Traditional coherent MFP assumes known relative phases of spectral components, limiting performance.
  • Ambient noise and unknown environmental parameters challenge existing MFP techniques.

Purpose of the Study:

  • To introduce and evaluate a matched-phase coherent matched-field processor (CP-MFP).
  • To assess the processor's ability to determine unknown relative phases of Fourier components.
  • To compare the performance of the CP-MFP against incoherent and conventional coherent processors.

Main Methods:

  • Developed a CP-MFP that treats relative phase as a free parameter optimized via global functional minimization.

Related Experiment Videos

  • Utilized cross-frequency terms to mitigate the impact of ambient noise.
  • Employed data from the SWellEx-96 experiment for validation and comparison.

    • Main Results:

    • The CP-MFP demonstrated a five decibel improvement over a similar coherent processor in one example.
    • Achieved superior range resolution compared to multi-frequency incoherent processors due to cross-frequency interference.
    • Showcased increased sensitivity to source levels.

    Conclusions:

    • The matched-phase coherent processor effectively determines unknown relative phases, enhancing signal processing capabilities.
    • CP-MFP offers significant advantages in noise robustness and resolution for underwater acoustic applications.
    • The processor's efficacy was validated using real-world experimental data.