DPOD2014: A new DORIS extension of ITRF2014 for precise orbit determination

• Published in: Advances in Space Research
• Main Authors: Moreaux, Guilhem, Willis, Pascal, Lemoine, Frank G., Zelensky, Nikita P., Couhert, Alexandre, Lakbir, Hanane Ait, Ferrage, Pascale
• Other Authors: Collecte Localisation Satellites Toulouse (CLS), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National d'Études Spatiales Toulouse (CNES), IGN-France International (IGN FI), Institut de Physique du Globe de Paris (IPGP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Centre National d'Études Spatiales Toulouse (CNES)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2019
• Subjects: DORIS; Intra-technique combination; Coordinate time series; ITRF2014; Precise orbit determination; Post-seismic deformation; Glacial Isostatic Adjustment (GIA); [SDU]Sciences of the Universe [physics]; Greenland; Thule
• Online Access: https://insu.hal.science/insu-03586670; https://doi.org/10.1016/j.asr.2018.08.043

International audience To support precise orbit determination of the altimetry missions, the International DORIS Service (IDS) regularly estimates the DPOD (DORIS terrestrial reference frame for Precise Orbit Determination) solution which includes mean positions and velocities of all the DORIS stations. This solution is aligned to the current realization of the International Terrestrial Reference Frame (ITRF) and so, can be seen as a DORIS extension of the ITRF. In 2016, moving to the IDS Combination Center, the DPOD construction scheme changed. The new DPOD solution is produced from a DORIS cumulative position and velocity solution. We present the new methodology used to compute DPOD2014 and its validation procedure. In order to present geophysical applications and interpretations of these results, we show two examples: (1) the Gorkha earthquake (M7.8 - April 2015) generates a 3-D mis-positioning of nearly 55 mm of the EVEB DORIS station at the Everest base camp 90 km from the epicenter. (2) Applying the results the DPOD2014 realization, we show that the most recent vertical velocity of Thule, Greenland is similar to that observed between 2006 and 2010, indicating further ongoing ice mass loss in the Thule region of northwest Greenland.