HITec - Hannover Institute of Technology

The HITec offers a lab environment for geodetic sciences and physics unique in the world. Simulations of various environmental conditions for the development of new measurement technologies for the new generation of navigation and engineering- and geodetic sciences can now be realized.

It is an excellent facility for the calibration and testing of geodetic and geo-scientific sensors, which now can be put to work.

  • Forschungsbau HITec vor Uni Hochhaus © FBG / C. Bierwagen
    Forschungsbau HITec

  • © IFE / M. Schilling
    FG5X-220

  • © IFE / M. Schilling
    Gradientenmessung

ABSOLUTE, RELATIVE AND QUANTUM GRAVIMETRY

The HITec expands the existing gravimetry calibration system considerably. In addition to the calibration of relative gravimeters also the measurement level of transportable absolute gravimeters can be tested.

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    The absolute gravity value at a measuring point changes continuously due to tides, atmosphere and hydrology. An absolute gravimeter with a higher accuracy does not yet exist. This deficiency will be solved in the future with the Very Long Baseline Atom Interferometer (VLBAI). With the help of the free fall of quanta over a vertical distance of 10 meters the VLBAI can determine the desired reference values. At the HITec gravimetry laboratory relative gravimeters will be used to determine the effects of local hydrological changes in the ground on the individual levels and the effects of tides, atmosphere and soil hydrology.

    Transportable absolute gravimeters (test versions) should always show the same offset for VLBAI evaluation in the gravimetry laboratory, which controls the long-term repeatability. This is important for environmental research, so that measured temporal changes are not falsified by varying measurement offsets of the absolute gravimeters. 

GNSS POSITIONING AND INERTIAL NAVIGATION

On the roof of the HITec an outdoor lab is available. Here, three precisely determined survey pillars are installed. In addition, a direct connection to a extremely temperature-stable GNSS lab with a stable reference frequency signal from the Physikalisch-Technische Bundesanstalt (PTB) exists. This allows for a close cooperation for the calibration of GNSS receivers. Important parameters like signal-, frequency- and system biases for GNSS equiments can be verified in a controlled environment.

On the roof of the Einstein elevator a GNSS reference station is installed, which is embedded into regional and global coordination systems and provides a precise time signal for the building.

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CONTACT

Absolute and Relative Gravimetry

Dr.-Ing. Ludger Timmen
Research Staff
Address
Schneiderberg 50
30167 Hannover
Building
Room
Address
Schneiderberg 50
30167 Hannover
Building
Room

GNSS Positioning, Navigation, Time

Dr.-Ing. Tobias Kersten
Research Staff
Address
Schneiderberg 50
30167 Hannover
Building
Room
429
Address
Schneiderberg 50
30167 Hannover
Building
Room
429