Measuring the Propagation Time of Coaxial Cables Used with GPS Receivers

Gerrit de Jong

Abstract:	Time comparisons by means of GPS are now widely used. The calibration of the receiver delay and the delay in the associated coaxial cables is very important to reach accuracies better than 10 ns. This paper describes and compares two methods: one using pulses of short rise times and one using interferometry of frequencies in the vicinity of the nominal frequency used. The results of the tests are described. Uncertainties < than 1 ng were attained for a cable length of 100 m at the 75 MHz IF frequency of the NBS designed GPS receivers.
Published in:	Proceedings of the 17th Annual Precise Time and Time Interval Systems and Applications Meeting December 3 - 5, 1985 DuPont Plaza Hotel Washington, DC
Pages:	223 - 232
Cite this article:	de Jong, Gerrit, "Measuring the Propagation Time of Coaxial Cables Used with GPS Receivers," Proceedings of the 17th Annual Precise Time and Time Interval Systems and Applications Meeting, Washington, DC, December 1985, pp. 223-232.
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