GPS device

Details GPS device GPS device

2004-12-16

2009-02-03

Phan, Dao L (Department: 3662)

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

Directive

Including a satellite

C342S357490, C342S357490

Reexamination Certificate

active

07486231

ABSTRACT:
A GPS device comprising: a first circuit arranged to receive at least one first signal and arranged to output first timing information dependent on the first signal; a second circuit arranged to receive at least one second signal and arranged to output second timing information dependent of the second signal; and a third circuit arranged to determine timing information of the device. The third circuit is arranged to receive at least one of the first and second timing information, and further arranged to produce third timing information dependent on at least one of the first and second signals. The third circuit further is arranged to produce a location estimate dependent on the first and third timing information. The third timing information is initially synchronized to the first timing information and maintained substantially synchronized to the at least one first signal using the second timing information.

REFERENCES:
patent: 5592173 (1997-01-01), Lau et al.
patent: 6122506 (2000-09-01), Lau et al.
patent: 2001/0034210 (2001-10-01), Nir et al.
patent: 1 092 987 (2001-04-01), None
patent: 1 130 415 (2001-09-01), None
patent: 1 229 344 (2002-08-01), None
patent: 2 394 134 (2004-04-01), None

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