ENHANCED DIFFERENTIAL GPS CARRIER-SMOOTHED CODE PROCESSING USING DUAL- FREQUENCY MEASUREMENTS

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

Peer Reviewed

Abstract:	This paper describes methods for using dual-frequency GPS data to improve the accuracy of carrier-smoothed code pseudorange measurements by eliminating the limitations imposed by ionospheric diver-gence. 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 will 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 are also discussed.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 46, Number 2
Pages:	127 - 138
Cite this article:	Hwang, Patrick Y., McGraw, Gary A., Bader, John R., "ENHANCED DIFFERENTIAL GPS CARRIER-SMOOTHED CODE PROCESSING USING DUAL- FREQUENCY MEASUREMENTS", NAVIGATION: Journal of The Institute of Navigation, Vol. 46, No. 2, Summer 1999, pp. 127-138.
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