GPS Week Rollover & Y2K Compliance for NBS-Type Receivers

V. Zhang, M. Weiss, E. Powers, R. Loiler

Abstract:	The NBS-type receiver software was modified to account for both the GPS end-of-week crossover and for the Y2K went. Receivers using this sofhoare were tested by personnel from the National Institute of Standards and Technology and the U.S. Naval Observatory using a simulator at the I Naval Research Laboratory. An independent test was pedomd by a privafe company. The software now appears to be fully compliant with requirements for both the GPS week roll-over and the Y2K events. Since the NBS-type receivers are still the predominant receiver for time transfer among laboratories which generate International Atomic Time, this receiver was given significant attention. In the process, an absolute calibration of the delay through the primary NIST GPS common-view receiver was completed. This wlibraiion agrees within its 2.8 ns uncertainty both with the value from an estimate in June 1986, which has been used continuously since then, and with an absolute calibration in April of 1987.
Published in:	Proceedings of the 30th Annual Precise Time and Time Interval Systems and Applications Meeting December 1 - 3, 1998 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	11 - 18
Cite this article:	Zhang, V., Weiss, M., Powers, E., Loiler, R., "GPS Week Rollover & Y2K Compliance for NBS-Type Receivers," Proceedings of the 30th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, December 1998, pp. 11-18.
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