Development of Triple Frequency Based Ionosphere Correction for Software GNSS Receiver

Sun-Jun Ko, Bernd Eissfeller, Jon O. Winkel

Abstract:	This paper presents the ionosphere correction technique by using triple-frequency phase-range measurements and its implementation on software GNSS receiver (ipexSR). Triple-frequency signal makes to correct higher-order ionosphere refraction errors, such as 1st, 2nd and higher-order terms through linear combination of different three frequencies phase measurements. It becomes the important process for Precise Point Positioning (PPP) in aspect of more accurate positioning performance for single-site point positioning application. Triple-frequency based ionosphere correction technique estimates in each ionosphere parameters of the empirical model with L1, L2 and L5 signal. It is basically searching integer ambiguities of triple phase-range and regenerating the pseudo-phase-range measurements which can be used to estimate the ionospheric higher order errors. The implemented software modules are modified as API (Application Programming Interface) software modules, which are em-bedded into software GNSS receiver (ipexSR). Implemented software GNSS receiver with ionosphere correction technique is evaluated through comparing with Klobuchar model based the ionosphere estimates in real-time.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2803 - 2808
Cite this article:	Ko, Sun-Jun, Eissfeller, Bernd, Winkel, Jon O., "Development of Triple Frequency Based Ionosphere Correction for Software GNSS Receiver," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 2803-2808.
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