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Area of Science:

  • Ocean Acoustics
  • Geophysical Signal Processing

Background:

  • Matched-field processing (MFP) is crucial for localizing underwater acoustic targets.
  • Mesoscale eddies introduce sound speed variations, impacting MFP accuracy.

Purpose of the Study:

  • Investigate the influence of mesoscale eddies on MFP localization errors.
  • Evaluate MFP performance under varying eddy structures and oceanic regions.

Main Methods:

  • Synthesized eddy structures using META 2.0 dataset and Argo float data.
  • Employed idealized eddy models and composite-analysis structures.
  • Evaluated localization algorithm performance with swept frequencies (50-75 Hz) and a circular array.

Main Results:

  • Localization errors show patterned distributions under specific conditions.
  • Error patterns are potentially useful for inverting eddy parameters.
  • Localization error increases with eddy disturbance strength within a certain sound speed mismatch range.

Conclusions:

  • Mesoscale eddies significantly affect underwater acoustic target localization accuracy.
  • Understanding error patterns can lead to improved eddy parameter inversion.
  • MFP performance is sensitive to eddy-induced sound speed mismatches.