A no-drift and less than 1/spl times/10/sup -13/ long-term stability quartz oscillator using a GPS SA filter

Recently the time-domain spectrum of the Global Positioning Satellite (GPS) Selective Availability (SA) modulation has been characterized. The continued growth of GPS, its utility, and the technology to receive and utilize the GPS signals have resulted in stable, multi-channel GPS timing receivers. These are now available from several vendors. Further, the GPS satellite constellation is essentially complete and has been declared operational, at least in its initial phase.<
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