Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2006-09-05
2006-09-05
Issing, Gregory C. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
Reexamination Certificate
active
07102567
ABSTRACT:
A method and a system for a location determination (a) acquire a first positioning signal; (b) analyze the first positioning signal to provide an estimate of a clock signal acceleration; (c) acquire additional positioning signals based on the estimate of the clock signal acceleration; and (d) perform the location determination using the first positioning signal and the additional positioning signals. The additional positioning signals may be acquired using a stacking technique. The first positioning signal may be acquired based on a signal-to-noise ratio exceeding a predetermined threshold. Clock signal acceleration may be estimated using a constant clock signal acceleration parametric model, which may be parabolic model based on a function that depends on the clock signal acceleration, a clock Doppler and an initial phase value. Alternatively, grids of various granularity may be searched clock signal acceleration space and a clock Doppler space in the vicinity of a clock Doppler value measured in the acquisition of the first positioning signal.
REFERENCES:
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patent: 5969672 (1999-10-01), Brenner
patent: 6397146 (2002-05-01), Bruner
patent: 2002/0105458 (2002-08-01), Dooley et al.
patent: 2005/0162306 (2005-07-01), Babitch et al.
Issing Gregory C.
Kwok Edward C.
MacPherson Kwok & Chen & Heid LLP
SiRF Technology Inc.
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