GPS BLOCK 2R TIME STANDARD ASSEMBLY (TSA) ARCHITECTURE

Anthony P. Baker

Abstract:	The underlying philosophy of the GPS 2R TSA architecture is to utilize two frequency sources, one fixed frequency reference source and one system frequency source, and to couple the system frequency source to the reference frequency source via a sample data loop. The system source is used to provide the basic clock frequency and timing for the space vehicle (SV) and it uses a VCXO with high short term stability. The reference source is an atomic frequency standard (AFS) with high long term stability. The architecture can support any type of frequency standard. In the system design rubidium, cesium, and H2 masers outputting a canonical frequency were accommodated. The architecture is software intensive. All VCXO adjustments are digital and are calculated by a processor. They are applied to the VCXO via a DAC.
Published in:	Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting December 4 - 6, 1990 Sheraton Premiere Hotel Vienna, Virginia
Pages:	317 - 324
Cite this article:	Baker, Anthony P., "GPS BLOCK 2R TIME STANDARD ASSEMBLY (TSA) ARCHITECTURE," Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting, Vienna, Virginia, December 1990, pp. 317-324.
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