Gps satellite signal acquisition assistance system and...

G - Physics – 01 – S

Patent

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G01S 5/14 (2006.01) G01S 1/00 (2006.01)

Patent

CA 2425547

A system and method for assisting an integrated GPS/wireless terminal unit in acquiring one or more GPS satellite signals from the GPS satellite constellation. The invention includes a method for narrowing the PN-code phase search. That is, by accounting for the variables in geographic location and time delay relative to GPS time, the systems and methods of the present invention generate a narrow code-phase search range that enables the terminal unit to more quickly acquire and track the necessary GPS satellites, and thereby more quickly provide accurate position information to a requesting entity.

La présente invention concerne un système et un procédé qui aident une unité de terminal sans fil/à GPS intégré à acquérir un ou plusieurs signaux de satellites GPS provenant de la constellation de satellites GPS; ainsi qu'un procédé de réduction de la recherche de la phase du code PN. Dans cette invention, la prise en compte des variables de la position géographique et du retard systématique par rapport au temps GPS permet aux systèmes et aux procédés selon l'invention de générer une plage étroite de recherche de la phase du code qui permet à l'unité de terminal d'acquérir et de suivre plus rapidement les satellites GPS nécessaires, et par conséquent de fournir plus rapidement les informations de position exactes à une entité requérante.

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