Method and apparatus for determining absolute time-of-day in...

Details Method and apparatus for determining absolute time-of-day in... Method and apparatus for determining absolute time-of-day in...

2007-07-17

2007-07-17

Tarcza, Thomas H. (Department: 3662)

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

Directive

Including a satellite

Reexamination Certificate

active

10801490

ABSTRACT:
A method and apparatus for determining time-of-day in a mobile receiver is described. In one example, expected pseudoranges to a plurality of satellites are obtained. The expected pseudoranges are based on an initial position of the mobile receiver and an initial time-of-day. Expected line-of-sight data to said plurality of satellites is also obtained. Pseudoranges from said mobile receiver to said plurality of satellites are measured. Update data for the initial time-of-day is computed using a mathematical model relating the pseudoranges, the expected pseudoranges, and the expected line-of-sight data. The expected pseudoranges and the expected line-of-sight data may be obtained from acquisition assistance data transmitted to the mobile receiver by a server. Alternatively, the expected pseudoranges may be obtained from acquisition assistance data, and the expected line-of-sight data may be computed by the mobile receiver using stored satellite trajectory data, such as almanac data.

REFERENCES:
patent: 6215442 (2001-04-01), Sheynblat et al.
patent: 6417801 (2002-07-01), van Diggelen
patent: 6430415 (2002-08-01), Agashe et al.
patent: 6510387 (2003-01-01), Fuchs et al.

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