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Multipath correlation at mid-frequency in a convergence zone.

F Hunter Akins1, William S Hodgkiss1

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Summary
This summary is machine-generated.

Convergence zone (CZ) propagation shows correlated multipath arrivals due to limited internal wave scattering. This study confirms theoretical predictions of correlated eigenrays in underwater acoustics.

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Area of Science:

  • Oceanography
  • Acoustics
  • Wave Propagation

Background:

  • Convergence zone (CZ) propagation involves a limited number of eigenrays with specific turning points.
  • The geometry of CZ propagation results in minimal random internal wave scattering over its ~60 km range.
  • This suggests potential correlation of CZ multipath over limited observation intervals.

Purpose of the Study:

  • To apply wave propagation theory in random media to CZ propagation.
  • To predict the correlation of CZ eigenrays within a Garrett-Munk internal wave field over a finite observation interval.
  • To compare theoretical predictions with experimental data from the Philippine Sea.

Main Methods:

  • Utilized the theory of wave propagation in random media.
  • Applied the Garrett-Munk internal wave model.
  • Estimated complex amplitudes of multipath arrivals using beamforming with a vertical line array.
  • Analyzed 5.5 kHz sinusoidal transmissions.

Main Results:

  • Theoretical predictions indicated correlated multipath over observation intervals of 100–200 seconds.
  • Experimental data from the Philippine Sea showed significant correlation of multipath arrivals over approximately 27 seconds.
  • The observed correlation in experimental data aligns with the theoretical framework.

Conclusions:

  • The study provides evidence supporting the hypothesis of correlated multipath in CZ propagation.
  • Experimental results validate theoretical predictions of eigenray correlation over finite observation intervals.
  • Findings contribute to understanding underwater acoustic propagation in dynamic ocean environments.