Wireless assisted gps using a reference location

Details Wireless assisted gps using a reference location Wireless assisted gps using a reference location

G - Physics

01

S

G01S 5/14 (2006.01) G01S 1/00 (2006.01) H04Q 7/36 (2006.01) G01S 5/00 (2006.01)

Patent

CA 2280758

The invention is directed towards a method for estimating a PRN synchronization and Doppler shift of a satellite signal at a reference location within a cell and sector of where a wireless terminal or WAG client is located. The estimates are based on information conveyed by a GPS signal acquired by an auxiliary system or WAG server, which may be at a location different from the wireless terminal or WAG client. The PRN synchronization and Doppler shift estimates are also based on some reference time, which is a time that is sufficiently far into the future to allow the WAG client to demodulate and decode the PRN synchronization and Doppler shift estimates from as assisting message transmitted by the WAG server and to use such estimates to acquire GPS signals, wherein the assisting message indicates the PRN synchronization and Doppler shift estimates.

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