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Analysis of station geodetic position time series: application to the International Terrestrial Reference Frame (ITRF)

Abstract : For the first time of its history, the latest to date realization of the International Terrestrial Reference System, the ITRF2005, has been generated from station position time series of the four main space geodetic techniques: the Global Positioning System (GPS), the Very Long Baseline Interferometry (VLBI), the Satellite Laser Ranging (SLR), and the Doppler Orbit determination and Radiopositioning Integrated by Satellite (DORIS). The ITRF computation process consists in stacking the station positions of each technique individually and then combining those using local ties. Meanwhile, time series of station positions allow investigating not only their temporal variations but also global biases that affect reference frame determination. In addition, the current ITRF computation process is a good opportunity to study the agreement of the station position estimations from the space geodetic techniques. To be comparable to each other, global biases which affect stations positions from each technique need to be properly estimated and removed. We have developed some methods to limit the aliasing effect which occurs during this estimation process. These methods have been applied to compare station height time series from VLBI, SLR, and GPS and geocenter motion time series. These analyses have highlighted a certain agreement at the annual frequency, which expresses the detection of loading effects. The use of a loading model in secular frame estimation process is therefore recommended.
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Xavier Collilieux. Analysis of station geodetic position time series: application to the International Terrestrial Reference Frame (ITRF). Astrophysics [astro-ph]. Observatoire de Paris, 2008. English. ⟨tel-02095044⟩

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