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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de

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She is Head of the GNSS Algorithms and Products Division within the GNSS Business Unit of GMV, being responsible for a division in charge of, among other activities, the GMV's magicODTS and magicPPP services, the Galileo CS Demonstrator and the Galileo Time and Geodetic Validation Facility. Laura Martínez Fernández holds a Degree in Aerospace Engineering from Polytechnic University of Valencia, specialty in Aero-navigation, and an MSc in Aeronautical Engineering from Polytechnic University of Catalonia, specialty in Space. When Laura Martínez finished her internship in GMV, she joined the company as a GNSS engineer working in activities related with magicGNSS, more concretely in precise orbit determination, precise positioning and integrity algorithms. Guillermo Tobías González holds an MSc in Telecommunication Engineering by the University of Zaragoza. He has 8 years of experience in GNSS, notably in the area of Precise Orbit Determination and Clock Synchronisation, including contributions to the Galileo Program and the IGS. He has been the GMV's responsible for the magicGNSS suite for the last years. He is currently Head of PPP and Authentication Products and Services Section. J. David Calle has a Master of Science in Computer Engineering from the University of Salamanca. He joined GMV in 2008 and he is currently working in the GNSS business unit designing and developing GNSS algorithms, applications and systems. He has been involved in the development of the magicGNSS suite and the Galileo Time and Geodetic Validation Facility. He is currently the technical responsible for the development of the Galileo Commercial Service Demonstrator.