GPS Instrumental Bias Between Receivers

Y. Gao, P. Héroux, X. Liao, F. Lahaye, N. Beck and M. Olynik

Abstract:	Determination of GPS instrumental biases between frequencies has been important for precise ionosphere modeling based on dual frequency GPS measurements because they affect the line-of-sight delay measurements. Recent data analysis has identified significant biases in the ionospheric measurements between different types of GPS receivers. The existence of inter-receiver biases could cause significant concerns to the GPS community who uses GPS data to derive measurements of TEC or generate ionospheric corrections based on a GPS network. The major concerns include 1) The ionospheric delay measurements derived from a network do not represent the actual ionosphere TEC; 2) Variations of the inter-receiver biases from satellite to satellite could corrupt the entire ionospheric modeling process. This paper describes a data collection method and associated numerical analysis developed to confirm the existence of inter-receiver biases in the GPS ionospheric measurements and characterize their behavior. Receivers tested include models from major GPS manufacturers that have been used for reference network applications.
Published in:	Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999) June 27 - 30, 1999 Royal Sonesta Hotel Cambridge, MA
Pages:	209 - 226
Cite this article:	Gao, Y., Héroux, P., Liao, X., Lahaye, F., Beck, N., Olynik, M., "GPS Instrumental Bias Between Receivers," Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999), Cambridge, MA, June 1999, pp. 209-226.
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