Position location with a low tolerance oscillator

Details Position location with a low tolerance oscillator Position location with a low tolerance oscillator

G - Physics

01

S

G01S 5/14 (2006.01) H04W 64/00 (2009.01)

Patent

CA 2343741

The present invention is a novel and improved method and apparatus for performing position location in wireless communications system. One embodiment of the invention comprises a method of performing position location in a wireless subscriber unit having a local oscillator, including the steps of receiving a position location request, acquiring a timing signal when a sufficient period of time has elapsed since the local oscillator has been corrected and correcting said local oscillator using a correction signal based on said timing signal, substantially freezing the connection signal, performing a position location procedure using the local oscillator with the correction signal applied, and ending said position location procedure.

La présente invention concerne un procédé et un appareil nouveaux et améliorés de localisation de position dans un système de communication sans fil. Un mode de réalisation de l'invention comprend un procédé de localisation de position dans une unité d'abonné sans fil ayant un oscillateur local, comprenant les étapes consistant à recevoir une demande de localisation de position, à acquérir un signal de synchronisation lorsqu'une durée suffisante s'est écoulée depuis que l'oscillateur local a été corrigé et à corriger ledit oscillateur local à l'aide d'un signal de correction basé sur ledit signal de synchronisation, à figer sensiblement le signal de correction, à exécuter une procédure de localisation de position à l'aide de l'oscillateur local avec le signal de correction appliqué, et à achever ladite procédure de localisation de position.

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