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Author: Hervé Sizun
Publisher: Springer Science & Business Media
ISBN: 3540266682
Category : Technology & Engineering
Languages : en
Pages : 423
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Book Description
This book describes the physical mechanisms involved in the propagation of electromagnetic waves in the radiofrequency range, inside and outside buildings, in the terrestrial and near space environments, with a special focus on mobile radio communication. It combines a theoretical and an experimental approaches with an understanding of the physical environment through adequate formulations of the laws of electromagnetism. It should thus provide the background needed by advanced students and development engineers for the conception of high quality and reliable telecommunication systems.
Author: Hervé Sizun
Publisher: Springer Science & Business Media
ISBN: 3540266682
Category : Technology & Engineering
Languages : en
Pages : 423
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Book Description
This book describes the physical mechanisms involved in the propagation of electromagnetic waves in the radiofrequency range, inside and outside buildings, in the terrestrial and near space environments, with a special focus on mobile radio communication. It combines a theoretical and an experimental approaches with an understanding of the physical environment through adequate formulations of the laws of electromagnetism. It should thus provide the background needed by advanced students and development engineers for the conception of high quality and reliable telecommunication systems.
Author:
Publisher: John Wiley & Sons
ISBN: 111981846X
Category : Science
Languages : en
Pages : 304
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Book Description
Electromagnetic Waves 1 examines Maxwell’s equations and wave propagation. It presents the scientific bases necessary for any application using electromagnetic fields, and analyzes Maxwell’s equations, their meaning and their resolution for various situations and material environments. These equations are essential for understanding electromagnetism and its derived fields, such as radioelectricity, photonics, geolocation, measurement, telecommunications, medical imaging and radio astronomy. This book also deals with the propagation of electromagnetic, radio and optical waves, and analyzes the complex factors that must be taken into account in order to understand the problems of propagation in a free and confined space. Electromagnetic Waves 1 is a collaborative work, completed only with the invaluable contributions of Ibrahima Sakho, Hervé Sizun and JeanPierre Blot, not to mention the editor, Pierre-Noël Favennec. Aimed at students and engineers, this book provides essential theoretical support for the design and deployment of wireless radio and optical communication systems.
Author: LAURENT.. BLANCHARD
Publisher:
ISBN:
Category :
Languages : fr
Pages : 157
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Book Description
LE BUT DE CETTE THESE EST UNE CONTRIBUTION A L'ETUDE DES PROPAGATIONS LONGUES DISTANCES SUR TRAJET TERRESTRE. PLUSIEURS MECANISMES PEUVENT INTERVENIR LORS DE LIAISONS TRANSHORIZON. LA PREDOMINANCE DE CHACUN D'ENTRE EUX EST CONDITIONNEE PAR LES CARACTERISTIQUES DU MILIEU DE PROPAGATION. POUR ETUDIER LE MILIEU DE PROPAGATION, NOUS AVONS EXPLOITE UNE BASE DE DONNEES RADIOMETEOROLOGIQUES AFIN D'EN EXTRAIRE DIVERSES INFORMATIONS SUR L'INDICE DE REFRACTION ET SON GRADIENT. DE FORTS ECARTS ENTRE LES VALEURS OBTENUES ET LES VALEURS STANDARDS ONT ETE RELEVES, MONTRANT LA NECESSITE D'ETUDIER PLUS EN DETAIL CE MILIEU. UNE ETUDE STATISTIQUE DU GRADIENT D'INDICE NOUS A PERMIS D'ETABLIR UN MODELE DE DISTRIBUTION CUMULEE ET DE CONTRIBUER A L'AMELIORATION DE LA RECOMMANDATION UIT-R P.453-6. AFIN D'ANALYSER L'IMPACT DU MILIEU DE PROPAGATION SUR L'AFFAIBLISSEMENT DE PROPAGATION, NOUS AVONS MIS EN PLACE UNE LIAISON RADIOELECTRIQUE DE 105 KM A 3 FREQUENCES (468, 915 ET 2208 MHZ). ELLE RELIE STRASBOURG A MULHOUSE SUR LA PLAINE D'ALSACE. CETTE LIAISON EST COUPLEE A DES MESURES RADIOMETEOROLOGIQUES. NOUS AVONS MIS EN EVIDENCE LA PRESENCE DE DIFFERENTS MECANISMES DE PROPAGATION ET UNE FORTE VARIATION DU SIGNAL RECU AU COURS DE LA JOURNEE POUR LES 3 FREQUENCES. UNE ETUDE STATISTIQUE DES NIVEAUX D'AFFAIBLISSEMENT NOUS INDIQUE QUE POUR LE POURCENTAGE DU TEMPS POUR LEQUEL L'AFFAIBLISSEMENT EST INFERIEUR A UN SEUIL DONNE POUVAIT VARIER FORTEMENT. LES RESULTATS DE CETTE ETUDE ONT SERVI A L'EVALUATION DU MODELE DE PROPAGATION DE LA RECOMMANDATION UIT-R P.452-8. UNE ANALYSE DES AFFAIBLISSEMENTS DE PROPAGATION ET DES PARAMETRES RADIOMETEOROLOGIQUES ONT MONTRE QUE CES VARIABLES SONT CORRELEES. LES EFFETS DE DISTANCE ET DE L'ENVIRONNEMENT ONT ETE ETUDIES SUITE A L'EXPLOITATION D'UNE CAMPAGNE DE MESURES EN CONTEXTE RADIOMOBILE A GRANDE DISTANCE. SOUS PARCELL (L'OUTIL D'INGENIERIE RADIOELECTRIQUE DES RESEAUX MOBILES DE FRANCE TELECOM), NOUS AVONS ELABORE DES MODELES DE PROPAGATION S'APPUYANT OU NE S'APPUYANT PAS SUR DES BASES DE DONNEES GEOGRAPHIQUES. LE MODELE DE LA RECOMMANDATION UIT-R P.452-8 A EGALEMENT ETE TESTE ET OPTIMISE A L'AIDE DE NOS MESURES.
Author: Laurent Blanchard
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Wave Propagation Panel. Symposium
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 436
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Book Description
Author: Armel Picquenard
Publisher:
ISBN: 9780333133125
Category : Ionospheric radio wave propagation
Languages : en
Pages : 343
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Book Description
Author:
Publisher:
ISBN:
Category : Radio
Languages : en
Pages : 1390
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Book Description
Author: Canada. Department of Communications
Publisher:
ISBN:
Category : Telecommunication
Languages : en
Pages : 314
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Book Description
Author: International Radio Consultative Committee
Publisher:
ISBN:
Category : Radio
Languages : en
Pages : 1108
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 934
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Book Description
