A GPS Positioning Results Using Precise Satellite Ephemerides, Clock Corrections and Ionospheric Grid Model with Jupiter

Yang Gao, James McLellan, and Mohamed Abousalem

Abstract:	Over the past few years, increased attention has been given to the use of precise GPS satellite ephemerides, satellite clock corrections and ionospheric models as an economical and efficient alternative to conventional DGPS. Precise satellite ephemerides and clock corrections are used to overcome the effects of broadcast ephemerides and clock errors including Selective Availability. Precise ionospheric models, on the other hand, are essential to single-frequency users for better estimation of ionospheric delays than just using the standard broadcast ionospheric model. Investigated in this paper is the achievable positioning accuracy using precise satellite ephemerides, satellite clock corrections and ionospheric grid model available from the Canadian Active Control System. A few tests were conducted using datasets collected at Algonquin Park, Ontario, and Calgary, Alberta. JupiterTM, a GPS post-processing software package developed by Pulsearch, was used for all data processing and management. Unsmoothed instantaneous least squares position fixes were computed, and the results were compared to the known coordinates of the stations occupied. Results have indicated that a one-to-three metre positioning accuracy is achievable using precise satellite ephemerides and clock corrections. The use of the precise ionospheric grid model, currently under development at the Geodetic Survey Division of Geomatics Canada, slightly improved the horizontal positioning, yet biases still remained in the height.
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:	25 - 34
Cite this article:	Gao, Yang, McLellan, James, Abousalem, Mohamed, "A GPS Positioning Results Using Precise Satellite Ephemerides, Clock Corrections and Ionospheric Grid Model with Jupiter," 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. 25-34.
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