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Ocean acoustic interferometry
J. Acoust. Soc. Am. Volume 121, Issue 6, pp. 3377-3385 (2007); (9 pages)
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Add to FacebookOcean acoustic interferometry refers to an approach whereby signals recorded from a line of sources are used to infer the Green’s function between two receivers. An approximation of the time domain Green’s function is obtained by summing, over all source positions (stacking), the cross-correlations between the receivers. Within this paper a stationary phase argument is used to describe the relationship between the stacked cross-correlations from a line of vertical sources, located in the same vertical plane as two receivers, and the Green’s function between the receivers. Theory and simulations demonstrate the approach and are in agreement with those of a modal based approach presented by others. Results indicate that the stacked cross-correlations can be directly related to the shaded Green’s function, so long as the modal continuum of any sediment layers is negligible.
© 2007 Acoustical Society of America
ACKNOWLEDGMENTS
This work was supported by the Office of Naval Research under Grant No. N00014-05-1-0264. The first author is also appreciative of support from a Fulbright Postgraduate Award in Science and Engineering, sponsored by Clough Engineering, as well as support from the Defence Science and Technology Organisation, Australia.
Article Outline
- INTRODUCTION
- THEORY
- Stationary phase evaluation
- Incorporation of sediment layers
- Spurious arrivals
- SIMULATIONS
- Isovelocity waveguide
- Waveguide with single sediment layer
- Refractive environment with sediment
- CONCLUSION
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History
Received 12 Jan 2007
Accepted 16 Mar 2007
Revised 13 Mar 2007
Accepted 16 Mar 2007
Revised 13 Mar 2007
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