A FULL FIELD INVERSION METHOD
FOR ACOUSTIC TOMOGRAPHY OF OCEANIC
O.A.Godin, D.Yu.Mikhin, A.V.Mokhov
Acoustic Wave Propagation Lab.
P.P. Shirshov Oceanology Institute
23 Krasikova str., Moscow 117851, Russia
An extension of matched field inversion technique to include oceanic
currents tomography is considered. Matching of non-reciprocity of
acoustic fields at propagation in opposite directions (instead of matching
sound fields themselves) makes it possible to separate relatively subtle
acoustic effects of the currents from those due to sound speed variations,
bottom topography etc. A set of numerical simulations is carried out under
environmental conditions typical to the Gulf Stream to evaluate stability
of the inversion with respect to mismatches in transceivers positions and
in sound speed for various choices of physical quantity to be matched.
Matching of non-reciprocity in phase is shown to result in sufficient
sensitivity to current velocity and high stability with respect to
mismatches in other parameters.
Dr. Dmitry Mikhin