Atomic clock augmented global positioning system receivers and global positioning system incorporating same
Patent 5736960 Issued on April 7, 1998. Estimated Expiration Date: 
September 19, 2015. 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.
September 19, 2015. 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.Patent ReferencesGeodetic surveying system using multiple GPS base stations Miniaturized atomic frequency standard Precise universal time for vehicles Golf distance measuring system and method Differential satellite positioning system ground station with integrity monitoring Patent #: 5600329 InventorsApplicationNo. 530553 filed on 09/19/1995US Classes:342/357.02With accuracy enhancingExaminersPrimary: Blum, Theodore M.Attorney, Agent or FirmInternational ClassesH04B 007/185G01S 005/02 AbstractA GPS radio navigation system utilizes an atomic clock in each user's GPS receiver station and a ground reference station located at a fixed, precisely known position which determines GPS time from satellite information and transmits an absolute time signal together with time-of-flight information over a communications path of precisely known length to the user stations, each at a fixed position. Once the atomic clock in a GPS receiver has been set to the precise GPS time, the user station is free to maneuver for an extended period of time during which its position is calculated from pseudorange and time information received from as few as three satellites and the time maintained by its atomic clock.Other References
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