Galileo Ionospheric Correction Algorithm Integration into the Open-Source GNSS Laboratory Tool Suite (gLAB)
Users of the global navigation satellite system (GNSS) operating with a single-frequencyreceiver must use an ionospheric correction algorithm (ICA) to account for the delay introduced onradio waves by the upper atmosphere. Galileo, the European GNSS, uses an ICA named NeQuick-G. In an effort to fost...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/335600 |
| Acceso en línea: | https://hdl.handle.net/2117/335600 https://dx.doi.org/10.3390/rs13020191 |
| Access Level: | acceso abierto |
| Palabra clave: | Global Positioning System Ionosphere Electromagnetic waves Global navigation satellite system (GNSS) Ionospheric correction algorithm (ICA) Standard positioning service (SPS) Galileo Sistema de posicionament global Ionosfera Ones electromagnètiques Àrees temàtiques de la UPC::Física |
| Sumario: | Users of the global navigation satellite system (GNSS) operating with a single-frequencyreceiver must use an ionospheric correction algorithm (ICA) to account for the delay introduced onradio waves by the upper atmosphere. Galileo, the European GNSS, uses an ICA named NeQuick-G. In an effort to foster the adoption of NeQuick-G by final users, two implementations in Clanguage have been recently made available to the public by the European Space Agency (ESA)and the Joint Research Centre (JRC) of the European Commission (EC), respectively. The aim ofthe present contribution is to compare the slant total electron content (STEC) predictions of thetwo aforementioned implementations of NeQuick-G. For this purpose, we have used actual multi-constellation and multi-frequency data for several hundreds of stations distributed worldwidebelonging to the Multi GNSS Experiment (MGEX) network of the International GNSS Service (IGS).For each first day of the month during year 2019, the STECs of the two NeQuick-G versions werecompared in terms of accuracy, consistency, availability, and execution time. Our study concludesthat both implementations of NeQuick-G perform equivalently. Indeed, in over 99.998% of the 2125million STECs computed, the output is exactly coincident. In contrast, 0.002% of the whole set ofSTECs for those rays are tangent to the Earth, the behavior of both implementations differs. Weconfirmed the discrepancy by processing radio-occultation actual measurements from a COSMIC-2 low Earth orbit satellite. We selected the JRC version of the Galileo ICA to be integrated intothe GNSS LABoratory (gLAB) tool suite, because its open license and its processing speed (it is13.88% faster than the ESA version). NeQuick-G outperforms the GPS ICA in STEC residuals up to12.15 TECUs (percentile 96.23th) and in the 3D position errors, up to 5.76 m (percentile 99.18th) forcode-pseudorange positioning. |
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