Ionospheric delay using only L1 : validation and application to GPS receiver calibration and to inter-frequency biases estimation

Richard Moreno, Norbert Suard

Abstract:	Ionospheric delay is one of the most important source of positioning error. A lot of methods have been developed. One of them rely on L1 frequency GPS signal [1]. This study aims to evaluate the accuracy of this method. The results obtained with this single frequency algorithm have been successfully compared to various ionosphere models (Klobuchar, Bent, and IRI-95). These comparisons demonstrate the accuracy of the method. To go further, single-frequency results have been compared to dual-frequency measurements. This study shows that using dual-frequency receiver is quite difficult. As a matter of fact, the quality of the results relies on several biases which have to be estimated : - dual-frequency receiver calibration - GPS satellites inter-frequency biases The study concludes that this algorithm is a good candidate for correcting in real-time the ionospheric delay. It also concludes that this method is a good mean for GPS receiver calibration. This study also permits to discover an error in data transmitted by GPS satellites.
Published in:	Proceedings of the 1999 National Technical Meeting of The Institute of Navigation January 25 - 27, 1999 Catamaran Resort Hotel San Diego, CA
Pages:	119 - 125
Cite this article:	Moreno, Richard, Suard, Norbert, "Ionospheric delay using only L1 : validation and application to GPS receiver calibration and to inter-frequency biases estimation," Proceedings of the 1999 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 1999, pp. 119-125.
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