Measured Ionospheric Delay Correction for Code-based GPS Time Transfer

Victor Zhang, Zhiqi Li

Abstract:	The use of dual-frequency multichannel receivers in GPS time and frequency transfer applications is increasing. Instead of using the modeled ionospheric delay correction or using the IGS ionospheric map, we can obtain the ionospheric delay corrections from the receivers’ dual-frequency measurements. For time and frequency transfer based on the pseudo-range measurements (code-based GPS time and frequency transfer), the CGGTTS format data are used for remote clock comparisons. All of the delays involved in measuring the difference between a local clock and GPS time must be calibrated for time transfer applications. If the receiver delay for the dual-frequency measurements is not calibrated or if the delay has changed, the measured ionospheric delay corrections will add uncertainty to the time transfer results. In this paper, we study the measured ionospheric delay correction for code-based GPS time transfer.
Published in:	Proceedings of the 46th Annual Precise Time and Time Interval Systems and Applications Meeting December 1 - 4, 2014 Seaport Boston Hotel Boston, Massachusetts
Pages:	144 - 148
Cite this article:	Zhang, Victor, Li, Zhiqi, "Measured Ionospheric Delay Correction for Code-based GPS Time Transfer," Proceedings of the 46th Annual Precise Time and Time Interval Systems and Applications Meeting, Boston, Massachusetts, December 2014, pp. 144-148.
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