Clock system and corresponding method for providing a clock time accounting for systematic error
Patent 6573799 Issued on June 3, 2003. Estimated Expiration Date: December 12, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
331/64, WITH INDICATOR, SIGNAL, OR ALARM342/350, DIRECTIVE342/352, Including a satellite342/357.01, With position indicating342/357.06, Using Global Positioning Satellite (GPS or Glonass)342/357.1, Combined with telecommunication342/357.12, GPS receiver signal processing701/213, Using Global Positioning System (GPS)701/214Means to improve accuracy of position or location
Method for accounting for factors (such as temperature) causing systematic errors (time-varying or constant) in a clock, such as a clock used in a ranging receiver (for use with a positioning system such as the Global Positioning System), and a corresponding clock system (including a clock and a filter such as a Kalman filter) for providing clock time and error, used for example in a ranging receiver. The invention adds new state vector components to account for systematic error. The process update equation used in the navigation solution is accordingly extended to include the additional components of the state vector.
Other References
"The Kalman Filter: Navigation's Integration Workhorse", by Larry J. Levy, in GPS World, Sep. 1997, pp. 65-7
December 12, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
