GPS Satellite Interfrequency Biases

Colleen H. Yinger, William A. Feess, Ray Di Esposti, Andy Chasko, Barbara Cosentino, Brian Wilson, Barbara Wheaton

Abstract:	The Global Positioning System (GPS) satellites broadcast L1-L2 satellite interfrequency bias correction terms, Tgd, for the GPS single frequency user. Accuracy of the L1- L2 biases is most important for the single-frequency authorized user since non-differential civilian errors are currently dominated by selective availability (SA) errors. Broadcast values based on factory calibration were replaced in April 1999 with values estimated by the Jet Propulsion Laboratory (JPL). This paper shows that JPL estimates are highly consistent with other centers and that originally broadcast values were not properly scaled from factory calibration data. Results of a field test at Holloman Air Force Base conclusively demonstrated that the JPL values improve navigation performance. The operations concept describes the procedure for updating broadcast values with JPL estimates on a routine basis, following satellite configuration changes, and when new satellites are launched.
Published in:	Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999) June 27 - 30, 1999 Royal Sonesta Hotel Cambridge, MA
Pages:	347 - 354
Cite this article:	Yinger, Colleen H., Feess, William A., Di Esposti, Ray, Chasko, Andy, Cosentino, Barbara, Wilson, Brian, Wheaton, Barbara, "GPS Satellite Interfrequency Biases," Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999), Cambridge, MA, June 1999, pp. 347-354.
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