Oleg A. Godin
NOAA/Atlantic Oceanographic and Meteorological Lab., 4301 Rickenbacker Cswy., Miami, FL 33149
Dmitry Yu. Mikhin
P. P. Shirshov Oceanogr. Inst. of the Russian Acad. Sci., Moscow 117851, Russia
A new, full field approach to acoustic monitoring of currents in the
ocean---matched nonreciprocity tomography (MNT)---was recently put forward
[Godin et al., in Full Field Inversion Methods in Ocean and Seismo-Acoustics,
edited by O. Diachok et al. (Kluwer, Dordrecht, 1995), pp. 261--266]. The
approach is based on inverting nonreciprocity in phase of a cw signal measured
at a set of points in a given vertical plane. MNT was designed to overcome the
problems with rays resolution and identification which make the traditional
current tomography technique inapplicable in coastal regions. Results of
numerical simulations of suggested MNT field experiments in the Strait of
Florida will be presented. The possibility to increase resolution and robustness
of the inversion with few transceivers by using wideband signals is considered.
The amount of a priori environmental information required for an unambiguous
currents inversion by MNT is evaluated. The possibility of simultaneous
measurements of both horizontal components of current velocity is also
addressed. Finally, the effects of surface and internal waves on the acoustic
monitoring of ocean currents are analyzed. [Work supported by NRC and RBRF.]
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