Zur Kalibrierung der Phasenzentrumsvariationen von GPS-Antennen für die hochpräzise Positionsbestimmung

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How to Deal With Station Dependent Errors - New Developments of the Absolute Field Calibration of PCV and Phase-Multipath With a Precise Robot 1

BIOGRAPHY Dr. Günter Seeber has been Professor at the Institut für Erdmessung, Universität Hannover since 1973, where he teaches satellite geodesy, geodetic astronomy and marine geodesy. He has specialized in satellite positioning techniques since 1969 and has published several scientific papers and books in the field of satellite and marine geodesy. Volker Böder and Falko Menge received their Dipl.-Ing. in Geodesy from the Universität Hannover and are currently employed as research associates in satellite positioning at the Institut für Erdmessung. Their current project concerns the GPS antenna and multipath calibration. Dr. Gerhard Wübbena received his degrees in Geodesy from the Universität Hannover. He has worked in the field of GPS since 1983 and developed the program system GEONAP. In 1990 he founded the company Geo++ , which develops satellite navigation and positioning software and systems. Dr. Martin Schmitz also received his degrees in Geodesy from the Universität Hannover. Present projects are i.e. active reference networks for highly precise RTK phase positioning (GNSMART) and the GPS station calibration project. ABSTRACT It has already been shown, that the absolute field calibration of GPS antenna phase center variations (PCV) with a precisely calibrated robot yields results with high accuracy and repeatability. Precise station independent absolute PCV are obtained. Many examples for different antenna types underline the high resolution in elevation and azimuth. It can be expected, that also IGS will switch to absolute PCV in a foreseeable period of time. The precision of the PCV enables a separation from the multipath (MP) errors. For active reference station networks, also providing real-time corrections, carrier phase multipath is an urgent field of research, since its periodic character also influences the correct instantaneous ambiguity resolution and the real time kinematic (RTK) positioning. Different scenarios from reduction to estimation are conceivable how to deal with this error term using a robot. The most recent developments of this approach and options for further research will be presented