Method and apparatus for locating gps equipped wireless...

Details Method and apparatus for locating gps equipped wireless... Method and apparatus for locating gps equipped wireless...

G - Physics

01

S

G01S 5/14 (2006.01) H04W 4/02 (2009.01) H04B 7/185 (2006.01)

Patent

CA 2366620

An apparatus and method for locating a remote station operating in analog mode, and that may not have a sense of network time, using an inverted GPS approach. The invention also enables remote stations operating in analog mode that do not know true GPS time to determine their own location. A time stamp, reflecting the approximate time a satellite range measurement is made, is assigned to the measurement at either the remote station or elsewhere in the network. The difference between true GPS network time and the measurement time is treated as a variable "error" in measurement, the length of which is unknown. This variable error is determined and used in determining the physical location of the remote station.

La présente invention concerne un appareil et un procédé de localisation d'un terminal distant fonctionnant an mode analogique, et qui peuvent n'avoir aucune idée de temps-réseau, utilisant une approche GPS inverse. L'invention permet également aux terminaux distants fonctionnant en mode analogique qui ne sont pas au courant du temps-réseau réel de déterminer leur propre localisation. Un horodateur, qui reflète le temps approximatif de l'établissement d'une mesure de la distance du satellite, est assigné à la mesure soit au niveau du terminal distant ou ailleurs sur le réseau. La différence entre le vrai temps-réseau GPS et le temps de mesure est considéré comme une </= erreur >/= variable de mesure, dont la durée est inconnue. On détermine cette erreur variable et on l'utilise dans la détermination de la localisation physique du terminal distant.

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