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              <p>Cet article présente une méthode ayant pour objectif d'estimer efﬁcacement des cartographies de niveau de puissance reçue par un récepteur mobile en environnement urbain pour lequel l'émetteur est un satellite. La propagation des ondes radioélectriques entre un satellite et un récepteur terrestre met en évidence des phénomènes de masquage et de multitrajets. Le signal reçu présente ainsi des évanouissements lents et rapides Aﬁn de modéliser les ﬂuctuations des signaux satellites reçus en tenant compte des spéciﬁcités du site de réception, cet article propose une nouvelle approche combinant des aspects statistiques et déterministes de la propagation. Pour les variations lentes, elle s'appuie sur un calcul efﬁcace du niveau moyen local reposant sur la notion de distance de cohérence. Pour les ﬂuctuations rapides, l'approche est basée sur la détermination du paramètre principal de la loi de Nakagami-m en fonction de la caractéristique majeure des multitrajets à savoir les interactions électromagnétiques (réﬂexions, diffractions). Le logiciel Ergospace basé sur un tracé de rayons sert de support à cette étude pour des environnements urbains et suburbains.</p>
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