Determination of Absolute Ionospheric Error Using a Single Frequency GPS Receiver

Renxin Xia

Abstract:	Thebnosphereisoneofthemajorobstacles preventing GPS measurementsofcentfmeterprecidon on the Earth’s surface. Current approaches for estimating and eliminating the ionospheric error involve either theoretic models or duaf-frequncy measurements. This paper proposes the real-time derfvatlon of the absolute ionospheric error from a single-frequency GPS receiver based on measurements of the ionospherk delay of the carrier and code phases of GPS signals. Because of smaller muftipath error, the procedure is carried out using the L2 band only. However, it applies equally to Ll C/A- code (coarse acquisition code) measurements, and as measurement quality improves, this procedure can be carried out on any singlsfrequency GPS receiver with reasonable accuracy. As a first step towards this direction;thfspapershowshowtosotveforthetrue satellite-to-receiver range. Also, by making a few assumptions about the ionosphere, a fairfy accurate delay model is rsmstwted with measurements from d&rent satellites over a twenty-four hour period.
Published in:	Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992) September 16 - 18, 1992 Albuquerque, NM
Pages:	483 - 490
Cite this article:	Xia, Renxin, "Determination of Absolute Ionospheric Error Using a Single Frequency GPS Receiver," Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992), Albuquerque, NM, September 1992, pp. 483-490.
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