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.
No takes yet. Share an insight, caveat, or question.
Wang et al. (2005) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: