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No Access Submitted: 21 September 2007 Accepted: 10 December 2007 Published Online: 11 March 2008

  • Passive fathometer processing

The Journal of the Acoustical Society of America 123, 1297 (2008); https://doi.org/10.1121/1.2831930
Peter Gerstoft and William S. Hodgkiss
  • Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 92093-0238
    • Martin Siderius
  • HLS Research Inc., 3366 North Torrey Pines Court, Suite 310, La Jolla, California 92037
    • Chen-Fen Huang
  • Department of Marine Environmental Informatics, National Taiwan Ocean University, Keelung, Taiwan
    • Chris H. Harrison
  • NURC, La Spezia, Italy
    • more...View Contributors
    • Peter Gerstoft
    • William S. Hodgkiss
    • Martin Siderius
    • Chen-Fen Huang
    • Chris H. Harrison
    ABSTRACT
    Ocean acoustic noise can be processed efficiently to extract Green’s function information between two receivers. By using noise array-processing techniques, it has been demonstrated that a passive array can be used as a fathometer [Siderius, et al., J. Acoust. Soc. Am. 120, 1315–1323 (2006)]. Here, this approach is derived in both frequency and time domains and the output corresponds to the reflection sequence. From this reflection sequence, it is possible to extract seabed layering. In the ocean waveguide, most of the energy is horizontally propagating, whereas the bottom information is contained in the vertically propagating noise. Extracting the seabed information requires a dense array, since the resolution of the bottom layer is about half the array spacing. If velocity sensors are used instead of pressure sensors, the array spacing requirement can be relaxed and simulations show that just one vertical velocity sensor is sufficient.

    ACKNOWLEDGMENTS

    This work was supported by the Office of Naval Research under Grant No. N00014-05-1-0264.

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