Analysis of the Temporal Stability of GPS and GLONASS Group Delay Correction Terms Seen in Various Sets of Ionospheric Delay Data

Gregory Bishop, David Walsh, Peter Daly, Andrew Mazzella, Elizabeth Holland

Abstract:	High accuracy application of the Global Positioning System (GPS) or GLONASS satellites in navigation, fPd=Y 9 or ionospheric monitoring requires close attention to the major error sources in GPS range measurement. These include: ionospheric delay, multipath from the receive antenna environment, the differential group delay correction term, T,, the difference in transmit time between the code on the two frequencies. Although comparatively small, difficulties in measming Tot, have made it a major problem for receiver calibration and ionospheric monitors. This paper introduces a new algorithm for T,&xeiver calibration. To perform this calibration, the algorithm only requires data from a single station on a single day. We apply this algorithm to GPS data from two sites, spanning several months. We also introduce a new method for representing the TGD values, that will facilitate comparison of measurements at different sites. Initial results support the conclusion that GPS Teu’s are quite stable over periods of months. We also apply this new technique to a first investigation of GLONASS data from the University of Leeds. Although GLONASS calibration is much more challenging, initial results are promising and show the technique to be very robust.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	1653 - 1661
Cite this article:	Bishop, Gregory, Walsh, David, Daly, Peter, Mazzella, Andrew, Holland, Elizabeth, "Analysis of the Temporal Stability of GPS and GLONASS Group Delay Correction Terms Seen in Various Sets of Ionospheric Delay Data," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 1653-1661.
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