Ocean Acoustic Tomography: Single Slice and Moving Ship Experiments
2006
Howe, Bruce M. | Worcester, Peter F.
Original contains color plates: All DTIC/NTIS reproductions will be in black and white. Supported in part by contract nos. N00014-91-J-4055, N00014-91-J-4117, and N00039-91-C-0072.
Show more [+] Less [-]The results of the ocean acoustic tomography work that supported the development of matched field processing (MFP) are summarized. This report focuses on two experiments. In Slice89 a single source transmitted to a vertical hydrophone array. This experiment improved our understanding of the single slice transfer function from scales of internal waves to 1000 km. It demonstrated the importance of unresolved high wavenumber ocean mesoscale variability to acoustic propagation. Any coherent signal processing technique must be robust against both internal wave variability and unresolved high wavenumber mesoscale variability, as both contribute roughly comparable amounts of travel time variance. The Acoustic Mid-Ocean Dynamics Experiment - Moving Ship Tomography Experiment (AMODE-MST) was a large mapping effort to address the primary goal of this tomography effort-to determine the precision with which the ocean mesoscale sound speed field can be measured for input into matched field (or other) processing of long-range acoustic transmissions. The experiment demonstrated that tomographic techniques can be used to measure the sound speed structure over a large area with high resolution.
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