{"id":221,"date":"2011-07-05T14:42:31","date_gmt":"2011-07-05T12:42:31","guid":{"rendered":"https:\/\/samovar2022.int-evry.fr\/index.php\/2011\/07\/05\/soutenance-these-de-magda-chelly\/"},"modified":"2020-09-04T18:47:16","modified_gmt":"2020-09-04T16:47:16","slug":"soutenance-these-de-magda-chelly","status":"publish","type":"post","link":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/2011\/07\/05\/soutenance-these-de-magda-chelly\/","title":{"rendered":"SOUTENANCE : Th\u00e8se de Magda Chelly"},"content":{"rendered":"

jeudi 7 juillet<\/strong> 2011 \u00e0 10h30<\/strong> T\u00e9l\u00e9com SudParis – Amphi 10<\/strong>.<\/p>\n

\u00a0\u00bb Propagation d’une position physique dans les r\u00e9seaux connect\u00e9s \u00ab\u00a0.<\/strong><\/p>\n

Jury:<\/strong><\/p>\n

– Madame Houda Labiod, Ma\u00eetre de Conf\u00e9rences,Telecom ParisTech \/ INFRES
\n– Monsieur Georges Alqui\u00e9, Professeur, Laboratoire d’\u00c9lectronique et \u00c9lectromagn\u00e9tisme Universit\u00e9 Pierre et Marie Curie
\n– Monsieur Jacques Ehrlich, Directeur de Recherche, LIVIC
\n– Monsieur Fr\u00e9d\u00e9ric Evennou, Ing\u00e9nieur R&D, Orange Labs
\n– Monsieur Pierre-Yves Gilli\u00e9ron, Research and Teaching Associate , Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL) Facult\u00e9 ENAC – Laboratoire de Topom\u00e9trie
\n– Monsieur Fran\u00e7ois Spies, Professeur, Laboratoire d’Informatique de l’universit\u00e9 de Franche-Comt\u00e9 (LIFC)
\n– Monsieur Nel Samama, Professeur, Telecom SudParis \/ EPH<\/p>\n

R\u00e9sum\u00e9 :<\/strong><\/p>\n

Les syst\u00e8mes de positionnement ont connu un progr\u00e8s ind\u00e9niable. Actuellement, la pr\u00e9cision atteint quelques centim\u00e8tres sous certaines conditions : espace ouvert, ciel d\u00e9gag\u00e9, technique tr\u00e8s sp\u00e9cifique, etc. N\u00e9anmoins, le probl\u00e8me du positionnement dans un environnement int\u00e9rieur demeure persistant : les trajets multiples qui compliquent les mod\u00e8les de propagation, l\u2019att\u00e9nuation, etc. Diff\u00e9rents syst\u00e8mes ont vu le jour, utilisant des technologies telles que l\u2019UWB, le WiFi ou l\u2019Infrarouge. Ces syst\u00e8mes apportent des r\u00e9sultats de positionnement int\u00e9ressants, atteignant l\u2019ordre du m\u00e8tre. Cette pr\u00e9cision reste li\u00e9e \u00e0 certaines contraintes : une infrastructure, une technologie utilis\u00e9e, une calibration, une technique de calcul, etc. <\/p>\n

Afin de r\u00e9duire toutes ces contraintes, nous proposons une nouvelle approche de positionnement. Notre approche utilise tous les \u00e9quipements r\u00e9seaux pr\u00e9sents dans un environnement. Elle se base sur deux \u00e9tapes fondamentales : l\u2019\u00e9tude de visibilit\u00e9 et l\u2019\u00e9laboration de liens g\u00e9ographiques. L\u2019\u00e9tude de visibilit\u00e9 permet d\u2019obtenir les \u00e9quipements visibles par un \u00e9quipement. Nous avons expos\u00e9 plusieurs mod\u00e8les de visibilit\u00e9 et nous avons effectu\u00e9 une comparaison des r\u00e9sultats. L\u2019\u00e9laboration de liens g\u00e9ographiques permet de construire un graphe g\u00e9ographique tridimensionnel reliant tous les \u00e9quipements de l\u2019environnement. Ce graphe nous permet de visualiser la r\u00e9partition des \u00e9quipements et d\u2019estimer les positions g\u00e9ographiques de chaque \u00e9quipement. <\/p>\n

Pour la mise en \u0153uvre de notre approche, nous avons d\u00e9velopp\u00e9 un simulateur sous Matlab. Le simulateur \u00e9labor\u00e9 \u00e9value d\u2019abord le nombre d\u2019\u00e9quipements visibles. Il estime les distances s\u00e9parant cet \u00e9quipement de chaque \u00e9quipement visible. Enfin, il construit un graphe g\u00e9ographique et calcul les positions g\u00e9ographiques. Des r\u00e9sultats de simulations sont pr\u00e9sent\u00e9s pour valider notre approche qui permet d\u2019aboutir \u00e0 un syst\u00e8me capable d\u2019op\u00e9rer, sans aucune infrastructure additionnelle, un positionnement dans un environnement int\u00e9rieur et ext\u00e9rieur. <\/p>\n

\n","protected":false},"excerpt":{"rendered":"

jeudi 7 juillet 2011 \u00e0 10h30 T\u00e9l\u00e9com SudParis – Amphi 10. \u00a0\u00bb Propagation d’une position physique dans les r\u00e9seaux connect\u00e9s \u00ab\u00a0. Jury: – Madame Houda Labiod, Ma\u00eetre de Conf\u00e9rences,Telecom ParisTech \/ INFRES – Monsieur Georges Alqui\u00e9, Professeur, Laboratoire d’\u00c9lectronique et \u00c9lectromagn\u00e9tisme Universit\u00e9 Pierre et Marie Curie – Monsieur Jacques Ehrlich, Directeur de Recherche, LIVIC – 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