Enhanced Differential GPS Carrier-Smoothed Code Processing Using Dual Frequency Measurements

Patrick Y. Hwang, Gary A. McGraw,John R. Bader

Abstract:	This paper describes methods for utilizing dual-frequency GPS data to improve the accuracy of carrier-smoothed code pseudorange measurements by eliminating the limitations imposed by ionospheric divergence. With these techniques, the steady state time constant used in the smoothing filter can be vastly extended as long as continuous carrier tracking is maintained. When used for Differential GPS (DGPS), the smoothing requirements for the reference and remote receivers can be decoupled since there would be no need to contend with ionospheric divergence. A new DGPS architecture that exploits these dual-frequency smoothing techniques to improve the accuracy of code differential systems is presented. Applications of these techniques to stand-alone GPS navigation will also be discussed.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	461 - 470
Cite this article:	Updated citation: Published in NAVIGATION: Journal of the Institute of Navigation
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