Satellite time determination for SPS receiver

Details Satellite time determination for SPS receiver Satellite time determination for SPS receiver

2011-06-21

2011-06-21

Phan, Dao L (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

Reexamination Certificate

active

07965230

ABSTRACT:
Methods and apparatus for improving position location performance, especially in weak coverage areas, are described herein. A SPS receiver is able to solve for position location in situations where at least two satellite signals can be received but only one time stamp can be successfully demodulated. The receiver can utilize the successfully decoded time reference to determine a time associated with bit edge transitions for signals from that satellite. The receiver utilizes the bit edge transition with the known time to set the time for at least one bit edge transition for signals from other satellites for which the time stamp is not demodulated. The receiver sets the time hypothesis to bit edge transitions occurring within a predetermined window including the bit edge transition with the known time. A position can be determined based on the time hypothesis. The time hypothesis and window placement can be modified following invalid position solutions.

REFERENCES:
patent: 6856282 (2005-02-01), Mauro et al.
patent: 6952440 (2005-10-01), Underbrink
patent: 7450063 (2008-11-01), Kangas
patent: 2003/0227963 (2003-12-01), Dafesh
patent: 2008/0079633 (2008-04-01), Pon et al.
patent: WO02059634 (2002-08-01), None
International Search Report and Written Opinion—PCT/US2008/087937, International Search Authority—European Patent Office—Sep. 7, 2009.

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