The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 08, 2009
Filed:
Mar. 02, 2007
Chi-shin Wang, Half Moon Bay, CA (US);
Zhike Jia, San Jose, CA (US);
Lianxue Xiong, Shanghai, CN;
Yinghao Tu, Shanghai, CN;
Chi-Shin Wang, Half Moon Bay, CA (US);
Zhike Jia, San Jose, CA (US);
Lianxue Xiong, Shanghai, CN;
Yinghao Tu, Shanghai, CN;
SiRF Technology, Inc., Santa Clara, CA (US);
Abstract
Systems and methods are provided that compensate for frequency drift due to temperature variation without the need for a temperature sensor. In one embodiment, a navigation receiver with an integrated communication device receives a base station reference signal, which is used to periodically calibrate a local oscillator frequency. In another embodiment, the calibrated local oscillator frequency drives a counter that is used to provide code phase estimation at the start of satellite signal acquisition. To provide temperature compensation in one embodiment, the calibrated local frequency is used to drive one or more counters at different calibration rates (i.e., different time intervals between calibrations). Count values from these counters are used to determine compensation for frequency drift due to temperature variation based on predicted frequency drift variation patterns between calibrations. This temperature compensation does not require a temperature sensor and further improves the accuracy of the code phase estimation.