A method for the location of mobile terminals

G - Physics – 01 – S

Patent

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G01S 5/14 (2006.01)

Patent

CA 2527898

The location of a mobile terminal (12) in a given area is determined by including the mobile terminal (12) both in a satellite-based positioning system and in a cellular communications system (14). The mobile terminal (12) is thus adapted to receive satellite signals from the satellite-based system and to be covered by at least one cell of the cellular communications system (14). The mobile terminal (12) is configured for determining at least approximately its coordinates (x, y, z), including an altitude coordinate (z) in said area, based on both satellite signals received from the satellite- based system and information (52) related to the cellular communication system (14). An estimate of the altitude coordinate (z) is derived from the information related to the cellular communications system (14), whereby satisfactory location performance is ensured also when one or more satellites in the satellite-based system are not visible at the mobile terminal (12).

L'invention concerne un procédé permettant de localiser un terminal mobile (12) dans une zone donnée, ce procédé comprenant l'étape qui consiste à inclure ledit terminal mobile (12), non seulement dans un système de positionnement par satellite, mais aussi dans un système de communication cellulaire (14). Ainsi, le terminal mobile (12) est à même de recevoir des signaux de satellite du système de positionnement par satellite, et peut être couvert par au moins une cellule du système de communication cellulaire (14). Ledit terminal mobile (12) est configuré pour déterminer, au moins de manière approximative, ses coordonnées (x, y, z), y compris une coordonnée d'altitude (y), dans ladite zone, en fonction de signaux de satellite qu'il reçoit du système de positionnement par satellite, et d'informations (52) relatives au système de communication cellulaire (14). Une estimation de la coordonnée d'altitude (z) est calculée à partir des informations relatives au système de communication cellulaire (14). Selon l'invention, des performances de localisation satisfaisantes sont garanties, même lorsqu'un ou plusieurs satellite(s) du système de positionnement par satellite n'est/ne sont détectable(s) par le terminal mobile (12).

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