Journal of Geodesy

, Volume 79, Issue 10–11, pp 567–572 | Cite as

Systematic errors in the Z-geocenter derived using satellite tracking data: a case study from SPOT-4 DORIS data in 1998

  • P. WillisEmail author
  • J. -P. Berthias
  • Y. E. Bar-Server
Original Article


Within the scope of the Global Geodetic Observing System, Doppler Orbit Determination and Radiopositioning Integrated by Satellite – as a geodetic technique – can provide precise and continuous monitoring of the geocenter motion related to mass redistribution in the Earth, ocean and atmosphere system. We have reanalyzed 1998 DORIS/SPOT-4 (Satellite pour l’ Observation de la Terre) data that were previously generating inconsistent geocenter positions (−65 cm offset). We show here that this error is due to an incorrect phase center correction provided with the DORIS preprocessed data resulting from a +12 cm offset in the cross-track direction that has been confirmed since. We also conclude that a 1 mm error in the cross-track offset of non-yawing sun-synchronous SPOT satellites will generate a −6.5 mm error in the derived Z-geocenter. Other non-yawing satellites would also be affected by a similar effect whose amplitude could be easily estimated from the orbit inclination


DORIS Terrestrial reference frame Geocenter variations Precise orbit determination Cross-track correction SPOT-4 


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • P. Willis
    • 1
    • 2
    Email author
  • J. -P. Berthias
    • 3
  • Y. E. Bar-Server
    • 2
  1. 1.Institut Géographique NationalSaint-MandéFrance
  2. 2.Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadenaUSA
  3. 3.Centre National d’Etudes SpatialesToulouse Cedex 9France

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