caa a22 4500 477097839 CHVBK 20180405111532.0 cr unu---uuuuu 170330e19960101xx s 000 0 fre 10.1007/BF02995692 doi (NATIONALLICENCE)springer-10.1007/BF02995692 Vauzelle Rodolphe ircom - ura CNRS n° 356, Equipe sic (Signal Image Communication), Université de Poitiers, UFR Sciences, SP2MI .boulevard 3 Téléport 2, BP179, F-86960, Futuroscope Cedex aut Un ModÈle Tridimensionnel de Diffraction dans les Bandes MÉtrique et DÉcimÉtrique [Elektronische Daten] [Rodolphe Vauzelle] A 3D diffraction model for VHF/UHF ranges For macrocellular mobile radiocommunication systems, prediction methods of field strength are bidimen-sional. Here, the author offers a 3D diffraction model assuming a negligible reflection influence. This model is based on the Fresnel-Kirchhojf theory and evaluates the effects of longitudinal and transverse variations of terrain in the volume limited by the first Fresnel zone. In order to do this, a 3D terrain profile of links is constructed and a bidimensional obstacle model (building screen) is developed. An extrapolation of Deygout's method subsequently allows the 3D diffraction loss to be determined. The results of this diffraction model, integrated in a classic propagation model, are compared to measurements carried out at 427 MHz. Institut Telecom / Springer-Verlag France, 1996 Electromagnetic propagation nationallicence Radio wave nationallicence Wave diffraction nationallicence Geographic relief nationallicence Three dimensional model nationallicence Irregular ground nationallicence Fresnel zone nationallicence Obstacle nationallicence vhf nationallicence uhf nationallicence Propagation onde électromagnétique nationallicence Onde radioélec-trique nationallicence Diffraction onde nationallicence Relief géographique nationallicence Modèle tridimensionnel nationallicence Terrain irrégulier nationallicence Zone Fresnel nationallicence Obstacle nationallicence Onde métrique nationallicence Onde décimétrique nationallicence Annales Des Télécommunications Springer-Verlag 51/1-2(1996-01-01), 61-74 0003-4347 51:1-2<61 1996 51 12243 https://doi.org/10.1007/BF02995692 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02995692 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Vauzelle Rodolphe ircom - ura CNRS n° 356, Equipe sic (Signal Image Communication), Université de Poitiers, UFR Sciences, SP2MI .boulevard 3 Téléport 2, BP179, F-86960, Futuroscope Cedex aut NATIONALLICENCE 773 0- Annales Des Télécommunications Springer-Verlag 51/1-2(1996-01-01), 61-74 0003-4347 51:1-2<61 1996 51 12243 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer