Comparative Analysis of GPS Clock Performance Using Both Code-Phase and Carrier-Derived Pseudorange Observations

Jay Oaks, Marie M. Largay, Wilson G. Reid, James A. Buisson

Abstract: The Naval Research Laboratory (NRL) has, for many years, determined the GPS space vehicle clock offsets by differencing the pseudorange observations and the post-fit orbit provide by the National Geospatial-Intelligence Agency (NGA). On 14 March 2004, NGA put into production a new class of pseudorange observations called carrier-derived pseudorange observations (CDP). Because the measurement noise of the new CDP observations is much lower than that of the code-phase pseudorange observations, NRL has begun to use the newer CDP observations in its analysis of GPS clock performance. A number of differences between the two types of data are pointed out, and a comparative analysis of clock performance with respect to frequency stability is reviewed. This work was performed under the sponsorship of the GPS Joint Program Office.
Published in: Proceedings of the 36th Annual Precise Time and Time Interval Systems and Applications Meeting
December 7 - 9, 2004
Hyatt Regency Washington on Capitol Hill
Washington, D.C.
Pages: 431 - 440
Cite this article: Oaks, Jay, Largay, Marie M., Reid, Wilson G., Buisson, James A., "Comparative Analysis of GPS Clock Performance Using Both Code-Phase and Carrier-Derived Pseudorange Observations," Proceedings of the 36th Annual Precise Time and Time Interval Systems and Applications Meeting, Washington, D.C., December 2004, pp. 431-440.
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