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Abstract

Influence of time varying geopotential models and ITRF realizations on precise orbits of altimetry satellites and derived mean sea level

Dr Sergei RUDENKO(1), Mr Michael ABLAIN(2), Dr Tilo SCHÖNE(1)

(1) GFZ German Research Centre for Geosciences, Germany
(2) Collecte Localisation Satellites (C.L.S.), France

Session theme: Precision Orbit Determination

  • oral

    Abstract

    Determination of precise orbits of Earth artificial satellites is a complicated and chalendging task. The accuracy of precise orbits of altimetry satellites depends on many factors, such as models and algorithms, a reference frame realization, corrections, tracking data, parameterization used and some others. Since the orbits of altimetry satellites are located at the altitude of 700-1400 km, the motion of these satellites is highly effected by irregularities of the Earth gravity field.
    In this paper we investigate the influence of some recent time varying geopotential models, such as EIGEN-6S and EIGEN-GL04S, taking into account periodic terms and drifts of the geopotential coefficients on the precise orbits of altimetry satelites ERS-1, ERS-2 and Envisat and regional and global mean sea level computed using these orbits. Addtitonally, the influence of three last realizations of the International Terrestrial Reference Frame, namely, ITRF2000, ITRF2005 and ITRF2008 on the precise orbits of these satellites and mean sea level derived is studied.

     
    Corresponding author:

      Dr Sergei Rudenko
      GFZ German Research Centre for Geosciences
      Telegrafenberg
      14473 Potsdam
      Germany
      E-mail:
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