Test Results from a Digital P(Y) Code Beamsteering GPS Receiver Designed forCarrier-Phase Time Transfer

Alison Brown, Neil Gerein and Ed Powers

Abstract:	The development of time transfer techniques using GPS carrier-phase observations promises the capability to deliver sub-nanosecond time transfer capabilities. NAVSYS' High-gain Advanced GPS Receiver (HAGR) has been designed to enhance the accuracy of the GPS observations by using digital beam-steering from an antenna array. This provides over 10 dB of additional signal gain on each satellite tracked which improves the accuracy of both the code and carrier tracking loops, simplifying integer ambiguity resolution for carrier phase time transfer. This same design provides a highly phase stable observation of the GPS carrier, relative to a local reference oscillator, that enables precise time observations to be made for carrier-phase time transfer. In this paper, the design of NAVSYS’ P(Y) L1/L2 Code HAGR, developed for precise time transfer applications, is described and test results are included showing the accuracy of the code and carrier phase observations.
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	2238 - 2245
Cite this article:	Brown, Alison, Gerein, Neil, Powers, Ed, "Test Results from a Digital P(Y) Code Beamsteering GPS Receiver Designed forCarrier-Phase Time Transfer," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 2238-2245.
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