Abstract
Doppler observations of U.S. Navy Navigation Satellites have been used to strengthen terrestrial networks in many areas of the world and to connect the networks and isolated sites to an earth-centered coordinate system. Parameters of the model used in the computation of the satellite ephemerides used for this purpose result in geodetic positions which are displaced from the center of mass of the earth by about 4 m with respect to the equator, and in longitudes which are rotated from the BIH conventional longitude by about 0.80 seconds of arc. Third order ionospheric effects neglected in the orbit computations in the calculation of site coordinates result in radial displacements of as much as several meters for high levels of solar activity when the right ascension of the node of the satellite is near the right ascension of the sun.
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