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Résumé
Les mesures deser de cibles de dimensions importantes en hautes fréquences doivent être effectuées à des distances telles, que la distance de champ lointain (distance de Fraunhofer) R soit vérifiée R ≥ 2d2/λ, où d est la longueur transverse de la cible et λ la longueur ďonde électromagnétique. Dans cet article sont proposées deux méthodes: ľune de correction de sphéricité, ľautre de correction de cylindricité de ľonde électromagnétique. Les deux approches ont été développées, validées, puis industrialisées. Le principe de ces deux corrections est basé sur ľapplication du principe de Huygens au cas du radar monostatique. Un développement théorique de la correction de sphéricité (correction bidimensionnelle) et de cylindricité (correction monodimensionnelle) est présenté ainsi que des simulations puis des validations sur cibles réelles. Enfin une comparaison des deux méthodes est proposée et montre ľefficacité de la correction bidimensionnelle.
Abstract
In high frequency thercs measurement of large target must be done at important distances, so the distance of measurement (Fraunhofer’s distance) R is given by R ≥ 2d2 /λ where d is the tranversal length of the target and λ the radiation wavelength. In this paper we present a method for target that are large relative to the curvature of the spherical wavefront and the curvature of the cylindrical wavefront. A two-dimensional analytical algorithm transforms the spherical wave (near-field) measurement into the desired plane wave (far-field) and a one-dimensionnal analytical algorithm transforms the cylindrical wave (near-field) measurement into the desired plane wave (far-field). We present some results on simulations and measurements. A comparison of one-dimensional and two-dimensional methods demonstrates the efficiency of the two dimensional methods.
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IRESTE, rue Christian Pauc, La Chantrerie, BP 60601, F-44306, Nantes Cedex 3
Thierry Guillemot, Eric Pottier & Joseph Saillard
Matra-Défense ssd La Chaudronne, RD 75, F-41300, Selles-Saint-Denis, France
Jean-René Levrel & Emmanuelle Lebreton
- Thierry Guillemot
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- Eric Pottier
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- Joseph Saillard
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- Jean-René Levrel
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- Emmanuelle Lebreton
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Guillemot, T., Pottier, E., Saillard, J.et al. Transformation champ proche — champ lointain bidimensionnelle et monodimensionnelle appliquée à des mesures de SER.Ann. Télécommun.52, 81–93 (1997). https://doi.org/10.1007/BF03001054
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Mots clés
- Section efficace
- Cible radar
- Champ proche
- Champ lointain
- Méthode mesure
- Diffraction onde
- Onde sphérique
- Onde cylindrique