A long, vertical line array was deployed off Monterey, California during the Heard Island Feasibility Test to measure the modal content of the received signals. The array contained 32, equally spaced hydrophones spanning from 345 to 1740‐m depth. The multichannel data were recorded through a tether to the R/V Point Sur. The measurements had very low signal to noise ratios and indicated the cw transmission losses were approximately 140 dB for a source/receiver range of 17 000 km. Modal content was analyzed using (i) the modal extent versus depth, (ii) frequency‐vertical wave‐number spectra, (iii) modal beamforming and (iv) least squares fitting. All led to the conclusion that the modal population is surprisingly rich. There was strong evidence of population up to at least mode seven in the data.
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October 1994
October 01 1994
Vertical array receptions of the Heard Island transmissions
Arthur B. Baggeroer;
Arthur B. Baggeroer
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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Brian Sperry;
Brian Sperry
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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Khosrow Lashkari;
Khosrow Lashkari
Monterey Bay Aquarium Research Institute, Monterey, California 93943
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Ching‐Sang Chiu;
Ching‐Sang Chiu
Naval Postgraduate School, Monterey, California 93943
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James H. Miller;
James H. Miller
Naval Postgraduate School, Monterey, California 93943
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Peter N. Mikhalevsky;
Peter N. Mikhalevsky
Science Applications International Corporation, McLean, Virginia 22102
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Keith von der Heydt
Keith von der Heydt
Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543
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J. Acoust. Soc. Am. 96, 2395–2413 (1994)
Article history
Received:
August 23 1992
Accepted:
June 07 1994
Citation
Arthur B. Baggeroer, Brian Sperry, Khosrow Lashkari, Ching‐Sang Chiu, James H. Miller, Peter N. Mikhalevsky, Keith von der Heydt; Vertical array receptions of the Heard Island transmissions. J. Acoust. Soc. Am. 1 October 1994; 96 (4): 2395–2413. https://doi.org/10.1121/1.410112
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