Integrating Electromagnetic and Hydrodynamic Models for the Characterization of Radar Targets in Marine Environment
Intégration des Modèles Électromagnétiques et Hydrodynamiques pour la Caractérisation des Cibles Radar en Environnement Marin
OPEN ACCESS
The paper describes a simulation methodology for radar targets in marine environment.Our approach is based on a new model,called "Scattering Center Set Unified Representation",which is able to approximate the backscattered radar target echo for any aspect angle.This model is fast to calculate and has the advantage to take into account the partial or total target concealing due to the sea waves.It associates to any target aspect a scattering center set.An amplitude map accounts for each scattering center anisotropy and geometrical visibility.A virtual model is then used for describing the target motion and its concealing by the sea waves.The influence of the sea clutter is also taken into account.The radar signatures used in our simulations have been measured in the anechoic chamber of ENSIETA for four scale-reduced naval targets.The paper also presents some imagery and classification results,which are aimed to illustrate the other side of the naval target characterization problem.
Résumé
L'article présente une méthodologie de simulation d'échos de cibles radar en environnement marin. La procédure est basée sur un nouveau modèle,appelé « Ensemble de Points Brillants en Représentation Unifiée » (EPB-RU),qui permet d'approcher le signal écho d'une cible radar pour l'ensemble de ses orientations. Ce modèle est rapide à calculer et a l'avantage de prendre en compte le masquage partiel ou total de la cible par les vagues de la mer. Il associe à chaque orientation de la cible un ensemble de points brillants (EPB). Pour chaque point brillant du modèle,une carte d'amplitude prend en compte son anisotropie et sa visibilité en fonction de l'angle de visée. Un modèle virtuel combiné mer-navire est utilisé pour décrire le mouvement de la cible et le masquage introduit par les vagues de la mer. L'influence du fouillis de mer est également prise en compte. Les signatures radar utilisées dans nos simulations correspondent à quatre maquettes de cibles navales mesurées dans la chambre anéchoïde de l'ENSIETA. L'article présente aussi quelques résultats d'imagerie radar et de classification,qui illustrent l'aspect inverse du problème de la caractérisation des cibles navales dans leur environnement.
Electromagnetic models,naval targets,hydrodynamic interaction,sea clutter.
Mots clés
Modélisation électromagnétique,cibles navales,interaction hydrodynamique.
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