Constellation, le dépôt institutionnel de l'Université du Québec à Chicoutimi

Résumé

Mobile devices location systems for remote objects (vehicle, person, commodity, etc.), such as RTLS (Real Time Location System) in general and AVL (Automatic Vehicle Location) particularly for vehicles and persons, are increasingly used today by several enterprises. Indeed, this facilitates the management of personal, products, increases productivity, and so on. These systems use positioning devices such as GPS and communication devices to send remote location data. The first constraint of GPS is that it does not provide a precise position at any time. The extensions of GPS such as WAAS systems and A-GPS, that improve the precision, have also other constraints (availability and cost). The second constraint comes when sending remote location data. Often, the communication devices used for this purpose are GSM modules that send data on the GSM network. The use of GSM network is expensive to send data periodically. To overcome these drawbacks (improve precision and send data with minimum cost), we propose a framework on hybrid mobile devices management system to create a reliable and optimal location system by: i) coupling the radio devices at low integration cost with GPS devices, ii) allowing different mobile objects to cooperate and deliver the positioning data to the remote server.