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A FULL FIELD INVERSION METHOD
FOR ACOUSTIC TOMOGRAPHY OF OCEANIC CURRENTS

O.A.Godin, D.Yu.Mikhin, A.V.Mokhov
Acoustic Wave Propagation Lab.
P.P. Shirshov Oceanology Institute
23 Krasikova str., Moscow 117851, Russia

Abstract:

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
1999-07-09