The impacts of the ionospheric observable and mathematical model on the Global Ionosphere Model
Visualitza/Obre
Cita com:
hdl:2117/116219
Tipus de documentArticle
Data publicació2018-02-01
Condicions d'accésAccés obert
Llevat que s'hi indiqui el contrari, els
continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
:
Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
A high-accuracy Global Ionosphere Model (GIM) is significant for precise positioning and navigating with the Global Navigation Satellite System (GNSS), as well as space weather applications. To obtain a precise GIM, it is critical to take both the ionospheric observable and mathematical model into consideration. In this contribution, the undifferenced ambiguity-fixed carrier-phase ionospheric observable is first determined from a global distribution of permanent receivers. Accuracy assessment with a co-located station experiment shows that the observational errors affecting the ambiguity-fixed carrier-phase ionospheric observables range from 0.10 to 0.35 Total Electron Content Units (TECUs, where 1 TECU =1016e-/m2 and corresponds to 0.162 m on the Global Positioning System, GPS L1 frequency), indicating that the ambiguity-fixed carrier-phase ionospheric observable is over one order of magnitude more accurate than the carrier-phase leveled-code one (from 1.21 to 3.77 TECUs). Second, to better model the structure of the ionosphere, a two-layer GIM has been built based on the above carrier-phase observable. Preliminary global accuracy evaluation demonstrates that the accuracy of the two-layer GIM is below 1 TECU and about 2 TECUs during low and high solar activity periods. Third, the single-frequency point positioning experiment is adopted to test the ionosphere mitigation effects of the GIMs. Positioning results demonstrate that the single-frequency positioning accuracy can be improved by more than 30% using the undifferenced ambiguity-fixed ionospheric observable-derived two-layer GIM, compared with that using the carrier-phase leveled-code ionospheric observable-based single-layer GIM.
CitacióNie, W., Xu, T., Rovira-Garcia, Adrià., Juan, J., Sanz, J., Gonzalez-Casado, G., Chen, W., Xu, G. The impacts of the ionospheric observable and mathematical model on the Global Ionosphere Model. "Remote sensing", 1 Febrer 2018, vol. 10, núm. 169, p. 1-13.
ISSN2072-4292
Versió de l'editorhttp://www.mdpi.com/2072-4292/10/2/169
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
remotesensing-10-00169.pdf | versió final publicada | 1,219Mb | Visualitza/Obre |