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Reformulation of frequency-difference matched-field processor for high-frequency known-source localization.

Minseuk Park1, Youngmin Choo1, Jongkwon Choi1

  • 1Department of Ocean Systems Engineering, Sejong University, Seoul 05006, South Korea.

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Summary
This summary is machine-generated.

This study enhances frequency-difference matched-field processing for underwater sound source localization. A modified processor improves accuracy by averaging autoproducts, reducing ambiguity in shallow ocean environments.

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Area of Science:

  • Ocean acoustics
  • Signal processing
  • Underwater acoustics

Background:

  • Frequency-difference matched-field processing (FDMP) is a high-frequency source localization technique.
  • Conventional FDMP faces challenges with replica modeling and signal processing, leading to ambiguity.
  • Existing methods struggle with low peak and dynamic range on ambiguity surfaces.

Purpose of the Study:

  • To modify the conventional frequency-difference matched-field processor.
  • To improve source localization accuracy and reduce ambiguity in underwater environments.
  • To address drawbacks of existing FDMP techniques.

Main Methods:

  • Modified the conventional processor to match the bandwidth-averaged autoproduct of the measured field with replicas.
  • Utilized approximate self-term matching for expected source locations.
  • Conducted numerical tests in shallow ocean environments and analyzed experimental data.

Main Results:

  • The proposed processor alleviates issues like low peak and low dynamic range on the ambiguity surface.
  • Numerical and experimental results confirm the enhanced properties of the modified processor.
  • High-frequency diffracted fields leave traces on the bandwidth-averaged autoproduct, causing bias with sound speed mismatch.

Conclusions:

  • The modified FDMP processor offers improved performance for underwater sound source localization.
  • The bandwidth-averaging approach effectively reduces ambiguity in replica modeling and signal processing.
  • Sound speed mismatch and high-frequency effects introduce localization biases even at low difference-frequencies.