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Title: | The impacts of the ionospheric observable and mathematical model on the Global Ionosphere Model | Authors: | Nie, W Xu, T Rovira-Garcia, A Juan Zornoza, JM Subirana, JS González-Casado, G Chen, W Xu, G |
Issue Date: | 25-Jan-2018 | Source: | Remote sensing, Feb. 2018, v. 10, no. 2, 169, p. 1-13 | 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. | Keywords: | Ionospheric observable Mathematical model Two-layer Undifferenced ambiguity-fixed mode |
Publisher: | Molecular Diversity Preservation International (MDPI) | Journal: | Remote sensing | EISSN: | 2072-4292 | DOI: | 10.3390/rs10020169 | Rights: | © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). The following publication Nie, W., Xu, T., Rovira-Garcia, A., Juan Zornoza, J. M., Subirana, J. S., González-Casado, G., … Xu, G. (2018). The impacts of the ionospheric observable and mathematical model on the Global Ionosphere Model. Remote Sensing, 10(2), (Suppl. ), 169, - is available athttps://dx.doi.org/10.3390/rs10020169 |
Appears in Collections: | Journal/Magazine Article |
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