Contributions of the French Institut Géographique National (IGN) to the International DORIS Service |
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Authors: | Pascal Willis Claude Boucher Hervé Fagard Bruno Garayt Marie-Line Gobinddass |
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Institution: | 1. Institut Géographique National, Direction Technique, 2, avenue Pasteur, 94165 Saint-Mandé, France;2. Institut de Physique du Globe de Paris, Géophysique Spatiale et Planétaire, UFR STEP, 35 rue Hélène Brion, 75013 Paris, France;3. Ministère de l’Ecologie, de l’Energie, du Développement durable et de l’Aménagement du territoire, Direction de la Recherche et de l’Inovation, Tour Pascal B, 92055 La Défense, France;4. Institut Géographique National, Service de Géodésie et de Nivellement, 2, avenue Pasteur, 94165 Saint-Mandé, France;5. Institut Géographique National, LAREG, 6-8 avenue Blaise Pascal, 77455 Marne-la-Vallée, France |
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Abstract: | DORIS is one of the four geodetic space techniques participating to the Global Geodetic Observing System (GGOS). Since the early development of this system, the Institut Géographique National played a specific and active role. Within, the International DORIS Service (IDS), IGN is in a particular position. While it is responsible for the installation and the maintenance of the DORIS ground tracking stations, it also handles one of the two IDS data center delivering DORIS data and products and has been an IDS Analysis Center for years, providing all possible IDS products, in particular the latest ignwd08 time series in preparation of ITRF2008. This paper explains the different aspects of the IGN contribution to IDS from an historical point of view, presents current activities and scientific results and provides a perspective for future activities. Recent DORIS results show a 10 mm precision or better when more than four DORIS satellites are available. Comparisons between recent DORIS solutions (ign07d02 and ign09d02) and past ITRF realizations show that errors are shared between the DORIS and the ITRF realizations. Some problems related to DORIS data processing are also discussed and possible ways to solve them in the future are discussed. In particular, we can now reject the tropospheric origin of the problem detected in the Envisat data after the software upload of October 12, 2004. A few applications in geodesy (terrestrial reference frame, Earth’s polar motion) and geophysics are also discussed as a natural extension of these service-type activities. |
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Keywords: | DORIS Geodesy Geophysics Analysis center Global data center |
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