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Please cite this article as: Tornatore, V., Kayıkç ı, E.T., Roggero, M., Comparison of ITRF2014 station coordinate input time series of DORIS, VLBI and GNSS, Advances in Space Research (2016), doi: http://dx.doi.org/10. 1016/ j.asr.2016.07.016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. The analysis method has proven to be particularly suited to obtain quasi-cyclostationary residuals which are an important property to carry out a reliable harmonic analysis. We looked for common signatures among the three techniques. Frequencies and amplitudes of the detected signals have been reported along with their percentage of incidence. Our comparison shows that two of the estimated signals, having one-year and 14 days periods, are common to all the techniques. Different hypotheses on the nature of the signal having a period of 14 days are presented. As a final check we have compared the estimated velocities and their Standard Deviations (STD) for the sites that co-located the VLBI, GNSS and DORIS stations, obtaining a good agreement among the three techniques both in the horizontal (1.0 mm/yr mean STD) and in the vertical (0.7 mm/yr mean STD) component, although some sites show larger STDs, mainly due to lack of data, different data spans or noisy observations. Comparison of ITRF2014 station coordinate input time series of DORIS, VLBI and GNSS

The main objective of this study is to provide in detail the theoretical basis of the Very Long Baseline Interferometry (VLBI) delay model, mainly according to the International Earth Rotation and Reference Systems Service (IERS) Conventions 2010. This goes along with introducing the concept of continuous piece-wise linear offset (CPWLO) functions for estimating sub-daily geodetic parameters at pre-defined epochs, e.g. at Universal Time (UT) integer hours or at integer fractions or multiples of integer hours. The geodetic parameters can be simultaneously and accurately estimated from VLBI observations in sub-daily resolution if enough observations within each estimation interval are carried out from homogenously distributed Earth-fixed VLBI antennas to space-fixed radio sources. After providing the basic VLBI model of the geometric delay including clock synchronization and tropospheric effects, the partial derivatives of VLBI observation equation with respect to the most important geodetic parameters are given and some typical VLBI results are shown.