Examining GPS Carrier-Phase Analyses to Evaluate the Accuracy of Frequency Transfer Using Data From NIST and PTB

Lisa Nelson, Judah Levine

Abstract:	In recent work, comparisons were made between the primary frequency standards at the National lnstitute of Standards and Technology (NIST) and the Physikalisch-Technische Bundesanstalf (PTB) using dual-frequency geodetic receivers that measure the phase of the GPS carrier relative to the local standard. In this work we report on studies of the effects of data analysis lengths, bias vs. non-bias fixing, and troposphere estimation on the final solution. This was done in an effort to determine the effect of data merging routines and atmospheric modeling on these comparisons. Initial results indicate that these effects currently contribute to the error budget at parts in 1015. We also show initial results using two different analytical software packages for the NlST/PTB baseline. This analysis was made in an effort to lower the overall error budget of the comparison technique.
Published in:	Proceedings of the 32th Annual Precise Time and Time Interval Systems and Applications Meeting November 28 - 30, 2000 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	57 - 66
Cite this article:	Nelson, Lisa, Levine, Judah, "Examining GPS Carrier-Phase Analyses to Evaluate the Accuracy of Frequency Transfer Using Data From NIST and PTB," Proceedings of the 32th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, November 2000, pp. 57-66.
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