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The variations of station coordinates deduced from Doppler observations with the use of a single point positioning method based on a precise ephemeris are estimated according to different models and softwares. An identical set of Doppler observations produces station coordinates whose coherence is generally better than 1 m. However, greater differences of 1.5 or 3 m can exceptionally be detected. Apart from the incoherence caused by the differences of models and criteria of data rejection, thedoi:10.1098/rsta.1980.0029 fatcat:dhfgn4i5sjcghna2seps6lm7gu