Patent ID: 9103915
Filing Date: 2015-08-11
Classification: G01S,H03J,H03L,H04B

Abstract:
1. A method for managing a reference oscillator within a wireless device, comprising: selecting reference oscillator parameters associated with a lowest reference oscillator error, wherein the selection is based upon reference oscillator parameters derived using different technologies within the wireless device, wherein the reference oscillator comprises a tunable reference oscillator, and wherein the reference oscillator parameters include tunable reference oscillator parameters, a reference oscillator frequency control value, a reference oscillator frequency bias, a reference oscillator frequency bias uncertainty and a time at which the reference oscillator parameters were determined; acquiring a satellite based upon the selected reference oscillator parameters; calculating a satellite-based position fix; determining a quality of the satellite-based position fix, wherein the quality corresponds to an uncertainty associated with the selected reference oscillator parameters; updating the reference oscillator parameters based upon the quality of the satellite-based position fix; determining, as the tunable reference oscillator parameters, a frequency center and a width of a search window using the reference oscillator parameters; tuning the tunable reference oscillator using the determined tunable reference oscillator parameters; determining the reference oscillator parameters based upon the quality of the satellite-based position fix; storing the reference oscillator parameters when the wireless device successfully determines the satellite-based position fix; receiving a current reference oscillator frequency control value and a current reference oscillator frequency bias estimate; adjusting the received reference oscillator frequency bias estimate; performing sanity checks on the adjusted reference oscillator frequency bias estimate; determining reference oscillator parameters for storage based upon the adjusted reference oscillator frequency bias estimate; and incrementing a counter which represents a confidence in the determined reference oscillator parameters.