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Multipath correlation at mid-frequency in a convergence zone
F Hunter Akins1, William S Hodgkiss1
1Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093, USA.
Abstract:
Convergence zone (CZ) propagation is characterized by a small number of eigenrays, each with one deep ocean turning point and no more than two upper ocean turning points. Because of this geometry, these rays undergo a small amount of random internal wave scattering relative to the CZ range of ∼ 60 km. It is hypothesized that CZ multipath will therefore be correlated over limited observation intervals. The theory of wave propagation in random media is applied to CZ propagation through a Garrett-Munk internal wave field to predict the correlation between CZ eigenrays at mid-frequency over a finite observation interval. The theoretical results predict correlated multipath over intervals between 100 and 200 s. This prediction is then compared to data collected during an experiment in the Philippine Sea. The complex amplitudes of multipath arrivals in the CZ from 5.5 kHz sinusoidal transmissions are estimated using beamforming with a vertical line array and seen to be significantly correlated over approximately 27 s.
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