[G01-1] International terrestrial reference frame

[G01-1-06] The status of DORIS in light of ITRF2014

^○Frank Lemoine¹, Laurent Soudarin², Guilhem Moreaux², Hugues Capdeville², Jean-Michel Lemoine³, Pascale Ferrage³, Jerome Saunier⁴, Denise Dettmering⁵, Marek Ziebart⁶, Pascal Willis^4,7, Patrick Michael¹ (1.NASA Goddard Space Flight Center, Greenbelt, Maryland, U.S.A., 2.Collecte Localisation Satellite, Ramonville Saint Agne, FRANCE, 3.Centre National D'Etudes Spatiales, Toulouse, FRANCE, 4.Institut National de l'information Geographique et forestiere, Saint-Mande, FRANCE, 5.DGFI, Technical University of Munich, Munich , GERMANY, 6.University College London, London, UNITED KINGDOM, 7.Institut de Physique du Globe de Paris, UMR 7154, Gravimetrie et Geodesie Spatiale, Universite Paris Diderot, Paris, FRANCE)

The Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) is one of the four techniques of Space Geodesy that contributes to the International Terrestrial Reference Frame. It consists of a network of 55-60 beacons distributed nearly homogeneously around the Earth's surface, as well as a satellite segment including up to six receiving satellites in Low Earth Orbit. Recently the DORIS community reprocessed more than 22 years of data in order to develop the DORIS technique contribution to the ITRF2014 realization of the International Terrestrial Reference Frame (ITRF). Six analysis centers implemented a series of improvements in both measurement and force modeling in order to develop their contributions. The IDS Combination Center prepared the technique contribution which revealed that recent data since the launch of Jason-2 have an intrinsic positioning uncertainty 9, 7, 8 mm respectively in the North, East and Up components, and yield a standard deviation in the polar motion differences with IERS C04 of 245 (Px) and 235 (Py) microseconds.

We discuss in this paper the continuing improvements in the DORIS technique since the completion of ITRF2014. These include the efforts to process a rawer form of the DORIS observable in the RINEX format, the development of a routine combination of DORIS coordinates for application to precise orbit determination DPOD2014, and a preliminary assessment of the contributions of Sentinel-3A and Jason-3 to the DORIS weekly solutions. We also review the performance of the “C" generation of Starec beacons, whose phase centers are defined to +/- 1 mm, and whose development and deployment was initiated in light of the work done by the IDS for ITRF2014.