| Autor: |
Gilbert, R. P., Scotti, T., Wirgin, A., Xu, Y. S. |
| Zdroj: |
Journal of the Acoustical Society of America; 1998, Vol. 103 Issue 3, p1320-1327, 8p |
| Abstrakt: |
This work addresses the inverse problem of the identification of a passive three-dimensional impenetrable object in a shallow-water environment. The latter is assumed to have flat perfectly reflecting (sound-soft top and sound-hard bottom) boundaries and therefore acts as a guide for acoustic waves. These waves are employed to interrogate the object and the scattered acoustic wavefield is measured on the surface of a (virtual) vertically oriented cylinder (of finite or infinite radius, corresponding to near- or far-field measurements) fully enclosing the object. The direct scattering problem is resolved in approximate manner by employing, in a local manner, the known separated-variable solution for a scattering by a vertically oriented cylinder in a perfect waveguide. The inverse problem is resolved in the same manner (i.e., with the same approximate field ansatz) by least-squares matching of theoretical fields (for trial objects) to the measured field. Examples are given of successful shape reconstructions for two types of immersed objects. This manner of solving approximately both the forward and inverse problems is generalized to the case of a body of shallow water with an elastic seabed. © 1998 Acoustical Society of America. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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