Patent ID: 7689810
Filing Date: 2010-03-30
Classification: G01S

Abstract:
1. A circuit to detect position signals in a mobile station comprising: a general-purpose processor configured to generate control signals to carry out signal detection and to carry out at least one other function not associated with the signal detection; and a detection circuit configured to respond to the control signals generated by said general-purpose processor to detect ranging signals from a Satellite Positioning System (SPS) in accordance with a signal detection algorithm, said signal detection algorithm having associated therewith a duration indicative of a duration of time for conducting detection of said ranging signals, wherein either said general-purpose processor or said detection circuit is further configured to change said duration based on a predetermined search rate constraint and at least one of a user interactivity rate, channel fading, or clock drift, and wherein the general purpose processor generates the control signals based in part on the duration.