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Real-time global ionospheric modelling from GNSS data with RT-TOMION model Roma Dollase, David López Cama, José María Hernández Pajares, Manuel García Rigo, Alberto Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions Universitat Politècnica de Catalunya. Departament de Matemàtiques Universitat Politècnica de Catalunya. IonSAT - Grup de determinació Ionosfèrica i navegació per SAtèl·lit i sistemes Terrestres Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica Global Positioning System Ionosphere Real time GNSS Ionosphere Total Electron Content TOMION GNSS (Sistema de navegació) Ionosfera As it is well known, the ionosphere, the region of the atmosphere between 50 and 1000 km height approximately containing the most part of its free electrons, has an important effect on Global Navigation Satellite System (GNSS), like the Global Positioning System (GPS) signals. It mainly consists on an advance (i.e. shortening) the carrier phase and a reduction of the group velocity (i.e. pseudorange increase). The effect ranges from few to hundreds of meters, and it is proportional to the line-of-sight integrated electron density of free electrons, and inversely proportional to the squared frequency. As consequence, the top-rank receivers (like the ones deployed worldwide within the International GNSS Service, IGS) provide dual-frequency GNSS measurements, in order to cancel out or, (more interesting for this work) to isolate the ionospheric delay variation with more than 99.9% of precision. In this way the GNSS system becomes a global ionospheric sensor (or Peer Reviewed Postprint (published version) 2015 Conference lecture Roma, D., López-Cama, J.M., Hernandez, M., Garcia-Rigo, A. Real-time global ionospheric modelling from GNSS data with RT-TOMION model. A: International Colloquium Scientific and Fundamental Aspects of the Galileo Programme. "5th International Colloquium Scientific and Fundamental Aspects of the Galileo Programme, 27-29 October 2015, Braunschweig, Germany". Braunschweig: European Space Agency (ESA), 2015, p. 1. https://hdl.handle.net/2117/85211 eng http://congrexprojects.com/2015-events/15a08/proceedings Restricted access - publisher's policy 1 p. application/pdf European Space Agency (ESA)