Accurate Determination of the Earth Tidal Parameters at the BIPM to Support the Watt Balance Project

  • O. FrancisEmail author
  • Ch. Rothleitner
  • Z. Jiang
Conference paper
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 139)


To achieve the targeted accuracy in the Bureau International des Poids et Mesures (BIPM) watt balance (WB) project, the value of g (acceleration due to gravity) must be known to an accuracy of 10−9 (10 nm/s2) during the operation of balance. Gravity changes due to Earth Tides are the largest time variable signal affecting g at 10−7. In order to improve the tidal prediction at the BIPM site, the relative spring gravimeter gPhone#032 collected observations for 6 months on site B of the BIPM. An analysis of the tidal results is presented here. We compare them with recent Earth and oceanic loading tidal models. In addition, using the gravity data from the Superconducting Gravimeter in Walferdange we demonstrate that a precision of +/−20 nm/s2 can be achieved on the predicted value of g using a synthetic tide and including atmospheric pressure, polar motion and hydrological effects.


Earth tides Gravity Spring gravimeter Superconducting gravimeter Watt balance 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Faculty of Science, Technology and CommunicationUniversity of Luxembourg (UL)Luxembourg CityLuxembourg
  2. 2.Bureau International des Poids et Mesures (BIPM)Sèvres CedexFrance

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