1,721,168 research outputs found
Ricostruzione di forme di oggetti fortemente diffusori attraverso modelli distribuzionali
No full textThe reconstruction of the shape of "strongly scattering" objects from the knowledge of
the scattered field is investigated. With reference to perfectly conducting cylinders, the
provided formulation accommodates the distribution nature of the induced surface
current density. Thus, as unknown representing the objects' contour, a single layer
distribution is chosen so that the boundary of the scatterers is described by its support.
The non-linear unknown-data mapping is linearized by means of the Kirchhoff
approximation and the inversion is performed by an extended SVD approach
FAST ANALYSIS OF DUAL REFLECTOR ANTENNAS.
No full textThe authors describe a technique which applies an interpolation procedure to the current distribution induced over the main reflector of a dual reflector system. This technique proves to be particularly favorable whenever the main reflector surface is known only numerically, as for shaped and/or deformed reflectors. For the sake of simplicity a hyperbolic cylinder is considered; however the extension to a three dimensional case and to more general configurations can be easily accomplished
NEAR-FIELD FAR-FIELD TRANSFORMATION BY PSEUDO-SAMPLING EXTENSION.
No full textThe pseudo sampling technique is extended to a volumetric source and applied to the near-field far-field transformatio
Microwave imaging of thin metallic cylinders
No full textIn this paper, we face the problem of determining the number and the locations of unknown thin cylinders from the knowledge of their scattered far field. The number and the locations of the unknown cylinders are described in terms of support of δ-functions. Neglecting the mutual interactions between the scatterers leads to a linear inverse problem which is solved by means of the Singular Value Decomposition approach. This problem is of interest in Ground Penetrating Radar and in civil engineering, where, for example, the problem arises of determining the number and the positions of reinforcement bars in concrete
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