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.
Contact
Absolute and Relative Gravimetry
30167 Hannover
GNSS Positioning, Navigation, Time
30167 Hannover