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New opportunities for the refinement of ionospheric modelling and reduction of the ionospheric error in GPS measurements arise since a third-frequency will be introduced for the modernised GPS system. This paper investigates theoretical models of the ionospheric refractive error. A triple-frequency method of correcting the 1st and 2nd order ionospheric refraction is presented and a triple-frequency ionosphere-free combination method is proposed for GPS modernization. These new methods can be equally applied to the European GALILEO system. In addition, typical effects of the 2nd and 3rd order ionospheric effects are also investigated, and a correct formula for the 3rd order ionospheric error is derived in a simple way for easy implementation. It is anticipated that the proposed refraction correction methods will play an important role in both the modernized GPS and GALILEO systems. Results show that the proposed triple-frequency methods can correct the ionospheric refraction effects to a millimetre level. Since the models are given in simple forms, these corrections can be easily implemented in many real-time applications and the triple-frequency methods for correcting high-order ionospheric can significantly eliminate the error remained in the current ionospheric models. The method developed will potentially contribute to a better long-range baseline ambiguity resolution and an accuracy improvement in precise point positioning.

KEYWORDS

GPS Modernization, Ionospheric Refractive Error, Triple-Frequency Methods, GALILEO.

Cite this paper

Z. Wang, Y. Wu, K. Zhang and Y. Meng -Triple-Frequency Method for High-Order Ionospheric Refractive Error Modelling in GPS Modernization,- Positioning, Vol. 1 No. 9, 2005, pp. -.





Autor: Zemin Wang, Yue Wu, Kefei Zhang, Yang Meng

Fuente: http://www.scirp.org/



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