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IMPROVED REAL-TIME CLOCK APPARATUS FOR FAST ACQUISITION OF GPS SIGNALS
IMPROVED REAL-TIME CLOCK APPARATUS FOR FAST ACQUISITION OF GPS SIGNALS
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机译:改进的实时时钟装置,用于快速获取GPS信号
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摘要
An 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.
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