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Monitoring UT1 from astro-geodetic techniques at the EOP Center of the IERS

  • D. Gambis (a1) and C. Bizouard (a1)

Abstract

Monitoring the Earth rotation is essential in various domains linked to reference frames firstly with applications in orbit determination, space geodesy or Astronomy. Secondly for geophysical studies where are involved mass motions within the different external fluid layers, atmosphere, hydrosphere, core and mantle of the earth, this on time scales ranging from a few hours to decades. The Earth Orientation Centre of the IERS is continuously monitoring the earth orientation variations from results derived from the various astro-geodetic techniques. It has in particular the task of deriving an optimal combined series of UT1 which is now based mainly on Very Long Baseline Interferometry (VLBI) with some contribution of LOD derived from GPS. We give here a brief summary concerning the contribution of the various techniques to UT1 and in aprticular how the use of LOD derived from GPS can improve the combination. More details are available in Gambis (2004) and Bizouard and Gambis (2009) and the website http://hpiers.obspm.fr/eop-pc/

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Copyright

References

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Bizouard, C. & Gambis, D., 2009, the combined solution C04 for Earth Orientation Parameters, recent improvements, Springer Verlag series, Series International Association of Geodesy Symposia, Vol. 134, Hermann (Ed.), pp. 265–270
Gambis, D., 2004, Monitoring Earth orientation using space-geodetic techniques: state-of-the-art and prospective, J. of Geodesy, Volume 78, Issue 4–5, pp. 295303, doi 10.1007/s00190-0040394-1.
Vondrak, J. & Gambis, D., 1999, Accuracy of Earth orientation parameters obtained by different techniques in different frequency windows, in: Soffel, M., Capitaine, N. (eds.) JSR 1999 Systmes de rfrence spatio-temporels and IX. Lohrmann Colloquium, Observatoire de Paris, 206–213.
Vondrak, J. & Cepek, A., 2000, Combined smoothing method and its use in combining Earth orientation parameters measured by space techniques, Astron. Astrophys. Suppl. Ser. 147, 347–359
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Keywords

Monitoring UT1 from astro-geodetic techniques at the EOP Center of the IERS

  • D. Gambis (a1) and C. Bizouard (a1)

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