Accelerated computation of the Physical Optics approximation for near-field single- and double- bounces backscattering
Résumé
This paper deals with the acceleration of the Physical Optics (PO) approximation for the backscattering computation in the near and far field, for both single-(SB) and doublebounces (DB) PO contributions. It is based on physical arguments, which allow us to apply either a closed-form expression (rapid calculation) or a numerical double integration to evaluate the scattered field from sub-surfaces of a given mesh. The use of the closed-form expression is governed by two criteria, which must be extended to the bistatic case and also to the double bounce: the conventional Fraunhofer (related to the far-field zone) criterion and the chord error (related to the surface curvature) criterion. The proposed method is tested on a dihedral geometry.
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Bourlier et al-2019-Accelerated computation of the Physical Optics approximation for near-field.pdf (2.43 Mo)
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