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Research Field 1: Geometric TechniquesThe space geodetic observation techniques, such as Very Long Baseline Interferometry (VLBI), Satellite and Lunar Laser Ranging (SLR/LLR), Global Navigation Satellite Systems (GNSS) with the microwave techniques GPS, GLONASS and in future Galileo, and Doppler Orbitography and Radio positioning Integrated by Satellite (DORIS) as well as satellite altimetry provide the basis for the work within this research field. The geometric techniques allow a highly precise and continuous determination of the figure of the Earth along with its temporal variations and provide valuable information to identify and quantify even the smallest variations in space and time, e.g., as indicators for global change or for near real-time warning systems. A fundamental requirement and goal are highest accuracies for the full processing chain of the space geodetic observations as well as highly accurate, consistent and long-term stable geodetic reference frames with highest reliability. The research field "Geometric Techniques" is primarily concerned with the determination and analysis of geometric parameters describing the shape and orientation of the Earth. With the inclusion of the research activities and developments of the Geodetic Observatory Wettzell, which is jointly operated by the Bundesamt für Kartographie und Geodäsie (BKG) and the Forschungseinrichtung Satellitengeodäsie (FESG) of the Technische Universität München, the complete processing chain is well covered within CGE: observation techniques and procedures, data acquisition and provision, development of models and data analysis, parameter determination and combination as well as the realization of geodetic reference systems.
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