System and method for determining the position of a wireless...

G - Physics – 01 – S

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G01S 5/14 (2006.01) G01S 1/00 (2006.01) G01S 5/00 (2006.01) G04G 7/02 (2006.01) G01S 5/02 (2006.01)

Patent

CA 2323625

An apparatus and method to determine a position of a mobile wireless transceiver. The invention merges GPS position location and wireless communication technologies to achieve a precise position location in dense urban and other environments when line-of-sight to the satellites is somewhat obscured. The inventive apparatus and method use signals from only two GPS satellites (60, 70, 80, 90) and the serving terrestrial base station. In a most general sense, the inventive method includes the steps of receiving at a base station (10) a first signal transmitted from a first GPS satellite and a second signal transmitted from a second GPS satellite. The mobile's transmitter (200) and receiver (100) are adapted to receive these GPS signals as well and transmit a third signal to the base station in response thereto. The base station (10) receives the third signal and uses it to calculate the position of the wireless unit (20).

La présente invention concerne un appareil et un procédé permettant de déterminer la position d'un émetteur-récepteur mobile sans fil. Cette invention associe les technologies de localisation de position GPS et de communications sans fil pour réaliser une localisation précise dans un environnement urbain ou un autre environnement, lorsque la visibilité directe vers les satellites est quelque peu masquée. Les procédé et appareil de cette invention utilisent des signaux provenant de deux satellites GPS seulement (60, 70, 80, 90) et de la station de base terrestre de desserte. De manière plus générale, cette invention consiste à recevoir dans une station de base (10) un premier signal émis par un satellite GPS et un second signal émis par un second satellite GPS. Les émetteur (200) et récepteur (100) mobiles sont conçus pour recevoir d'abord ces signaux GPS et pour émettre ensuite un troisième signal à la station de base. La station de base (10) reçoit un troisième signal qu'elle utilise pour calculer la position de l'unité sans fil (20).

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