Using the lonosphere for BPS Measurement Error Control

Gregory Bishop, Andrew Mazzella and Elizabeth Holland

Abstract:	The ionosphere can be used to monitor and control measurement errors in DGPS base stations. The Self-Calibration Of pseudoRange Errors (SCORE) technique can calibrate an installed GPS two-frequency receiver system for the combination of all system components’ contributions to pseudorange error, and detect changes in these errors. With this ability to calibrate and monitor the integrity of pseudorange measurements, SCORE algorithms can contribute to ionosphere error measurement/modeling for DGPS and WAAS. Recently, an improved algorithm has been developed that permits calibrations to be generated in minutes instead of hours, malting it possible to perform near-real-time system monitoring. Technical details of these SCORE algorithms’ evolution and operation will be presented. Test results comparing algorithm performance and examining stability of the calibration results and system drift monitoring will be reviewed. Initial results from improvements to the SCORE algorithms to accelerate real-time applications, and to permit single-frequency receivers some capability to monitor ionospheric pseudorange error will also be discussed. If sufficiently capable, these enhancements may enable single-frequency systems to contribute to ionospheric error monitoring, possibly simplifying WAAS error modeling.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	1091 - 1100
Cite this article:	Bishop, Gregory, Mazzella, Andrew, Holland, Elizabeth, "Using the lonosphere for BPS Measurement Error Control," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 1091-1100.
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