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[Translate to English:] Permanente GNSS-Station


The 3rd station of our excursion was the permanent GNSS receivers. These allow the determination of positions within a few millimetres. To achieve this precision, data of the ephemeris of the satellites must be known. At the beginning of the 1980s, this information was only available for the U.S. Defence Mapping Agency in Washington. To get this more precise orbit data for civil usage, National Geodetic Survey installed in the mid 1980s stationary GPS receivers at the sites of Richmond, Ft. Davis, and Westford. From 1987 on, the fundamental station of Wettzell participated in this enterprise. At the beginning of the 1990s, this network, known as CIGNET (Cooperative International GPS Network), consisted of 25 globally distributed international stations. Nowadays, CIGNET is integrated in the International GNSS Service (IGS). This network contains more than 350 globally distributed stations. 100 of them, also the station in Wettzell, are so called core stations and their data was used for the calculation of the high precise orbit data.

 ring laser
 superconducting gravimeter
 20 m radio telescope
 WLRS (Wettzell Laser Ranging System)
 time and frequency system  homepage of the excursion

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