Patent Number: 7,102,567

Title: System and method for estimating clock acceleration and location determination

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.

Inventors: Stone; Jesse (Palo Alto, CA)

Assignee: SiRF Technology, Inc.

International Classification: G01S 5/14 (20060101)

Expiration Date: 9/05/02018