Real time clock apparatus for fast acquisition or GPS signals
January 21, 2017. 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 ReferencesPrecise universal time for vehicles Signal acquisition and reception method for a global positioning system signal GPS receiver having a low power standby mode GPS receiver having a rapid acquisition of GPS satellite signals GPS receiver device and method for calibrating a temperature uncompensated crystal oscillator GPS receiver using a radio signal for improving time to first fix Method for rapid signal acquisition in a satellite communications system Patent #: 5666122 InventorsApplicationNo. 786586 filed on 01/21/1997US Classes:701/214, Means to improve accuracy of position or location342/357.12GPS receiver signal processingExaminersPrimary: Zanelli, Michael J.Attorney, Agent or FirmInternational ClassG01C 021/00AbstractAn apparatus for improving the acquisition time of GPS signals includes a GPS receiver (21) and a real-time clock circuit (30). The GPS receiver receives GPS signals including a precise time reference signal for providing a position based upon the location of the GPS receiver. The GPS receiver also includes an internal time base (11) derived from the precise time reference signal. The real-time clock circuit is coupled to the GPS receiver for receiving a first time reference signal from the GPS receiver when the precise time reference signal of the GPS signal is available and for providing a second time reference signal to the GPS receiver when the precise time reference signal of the GPS signal is not available thereby allowing a fast acquisition time of GPS signals when the GPS signals are temporarily interrupted or not yet available. | |
