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Proceedings Paper

Determination of material parameters and influence of measurement errors on the reflection and backscatter properties of realistic material arrangements
Author(s): Juergen Preissner; Volker Stein
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Paper Abstract

The scope of the paper deals with the prediction of the RCS of nonmetallic structures. The scattering matrix of a complex object is derived from the Physical Optics Method and the Method of Equivalent Currents. Both tools need the material parameters or the Fresnel reflection factors as input values. In a realistic world scene the material parameters or the reflection factors in general can be evaluated by measurements only. For this purpose two different principles are applied, namely the measurement of S-parameters in a waveguide followed by the determination of the material parameters and the measurement of reflection factors under free space conditions thus allowing cross checks of the individual results which cannot be free of errors. To demonstrate the influence of measurement errors a square metallic panel was used which was covered with two different ferromagnetic layers for which different sets of material parameters exist due to different measurement principles and investigations at independent laboratories The resulting Fresnel reflection factors, Brewster angles and radar cross sections are presented and discussed.

Paper Details

Date Published: 7 July 1998
PDF: 12 pages
Proc. SPIE 3375, Targets and Backgrounds: Characterization and Representation IV, (7 July 1998); doi: 10.1117/12.327157
Show Author Affiliations
Juergen Preissner, DLR (Germany)
Volker Stein, DLR (Germany)

Published in SPIE Proceedings Vol. 3375:
Targets and Backgrounds: Characterization and Representation IV
Wendell R. Watkins; Dieter Clement, Editor(s)

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