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Research and Goals of geo-Q (SFB-1128)

The geoQ (SFB-1128) project is organized by three Research Areas (A, B and C) which are furthermore divided into individual subprojects.

Research Area A: Frontiers of quantum sensors

PD Dr. Gerhard Heinzel

Albert Einstein Institut
Max Planck Institute for Gravitational Physics
Leibniz University Hannover

mail to Gerhard Heinzel
+49 511 762 19984





A: Frontiers of Quantum Sensors

Research Area A: Frontiers of quantum sensors

In Research Area A new instruments and sensors will be designed and developed.

We will investigate laser interferometry, the ultimate approach for length measurement available to us in the foreseeable future. Laser interferometric distance and acceleration measurements between freely falling test masses are expected to play a key role in future geodesy in space and, possibly, on ground. A first step in this direction is the GRACE Follow-On (GRACE-FO) satellite mission scheduled for launch in 2017, which includes an experimental laser interferomter (LRI) designed by members of geo-Q. But it is widely expected that many future satellite missions will be using laser interferometry for measuring the gravitational potential and its lower few gradients through the motion of multiple test masses in many degrees of freedom.We will develop atomic gravity sensors, both in compact, transportable and in large-scale stationary configurations. Transportable devices will allow observing temporal gravity and mass change with regional campaigns. Large-scale devices such as a new 10 m atom fountain will enable experimental gravimetry with very high sensitivity.We will investigate optical clocks and fibers to build up clock networks that have the potential to revolutionize gravimetry. By using the relativistic gravitational redshift for clock comparisons, we will open the field of relativistic geodesy to practical applications.

Projects in RA A

A: Frontiers of Quantum Sensors

Research Area A: Frontiers of quantum sensors

In Research Area A new instruments and sensors will be designed and developed.

We will investigate laser interferometry, the ultimate approach for length measurement available to us in the foreseeable future. Laser interferometric distance and acceleration measurements between freely falling test masses are expected to play a key role in future geodesy in space and, possibly, on ground. A first step in this direction is the GRACE Follow-On (GRACE-FO) satellite mission scheduled for launch in 2017, which includes an experimental laser interferomter (LRI) designed by members of geo-Q. But it is widely expected that many future satellite missions will be using laser interferometry for measuring the gravitational potential and its lower few gradients through the motion of multiple test masses in many degrees of freedom.We will develop atomic gravity sensors, both in compact, transportable and in large-scale stationary configurations. Transportable devices will allow observing temporal gravity and mass change with regional campaigns. Large-scale devices such as a new 10 m atom fountain will enable experimental gravimetry with very high sensitivity.We will investigate optical clocks and fibers to build up clock networks that have the potential to revolutionize gravimetry. By using the relativistic gravitational redshift for clock comparisons, we will open the field of relativistic geodesy to practical applications.

Projects in RA A

Research Area B: Metrology and system modeling

Prof. Dr. rer. nat. Claus Lämmerzahl

ZARM
Center of Applied Space Technology and Microgravity
University of Bremen

mail to Claus Lämmerzahl
+49 421 218 57834





B: Metrology and system modeling

Research Area B: Metrology and system modeling

Research Area B is dedicated to provide the modeling and design of the new measurement configurations in which the novel, highly precise sensors are embedded.

We will investigate and model multisensor systems at a new level of precision, including the measurement geometry, the measurement platforms, their environment, contaminations, and geophysical signals affecting the measurement process. Research Area B will combine and process the sensor data streams, and provide the methods needed to obtain clean data for the extraction of the gravitational information.

Projects in RA B

B: Metrology and system modeling

Research Area B: Metrology and system modeling

Research Area B is dedicated to provide the modeling and design of the new measurement configurations in which the novel, highly precise sensors are embedded.

We will investigate and model multisensor systems at a new level of precision, including the measurement geometry, the measurement platforms, their environment, contaminations, and geophysical signals affecting the measurement process. Research Area B will combine and process the sensor data streams, and provide the methods needed to obtain clean data for the extraction of the gravitational information.

Projects in RA B

Research Area C: Gravity modeling

Prof. Dr. Jürgen Müller



Institut für Erdmessung
Leibniz Universität Hannover

mail to Jürgen Müller
+49 511 762 3362

C: Gravity modeling

Research Area C: Gravity modeling

In Research Area C we will analyze and combine the novel data sets from space and ground techniques in order to derive gravity field models with unprecedented accuracy and spatial resolution. The highly accurate length measurements in space will contribute the long and medium wavelengths of the Earth’s gravity field and their temporal variations. Ground based gravimeter campaigns will provide regional information on gravity and mass variations, consistently complementing the global solutions. Networks of clocks will enable the direct determination of the gravitational potential at short time scales and at different length scales, which will stabilize resulting geoid solutions. The new class of gravity field models will serve as input for further geodetic applications in the context of the Global Geodetic Observing System (GGOS) and will be the basis for Earth system research in the geosciences.

Projects in RA C

C: Gravity modeling

Research Area C: Gravity modeling

In Research Area C we will analyze and combine the novel data sets from space and ground techniques in order to derive gravity field models with unprecedented accuracy and spatial resolution. The highly accurate length measurements in space will contribute the long and medium wavelengths of the Earth’s gravity field and their temporal variations. Ground based gravimeter campaigns will provide regional information on gravity and mass variations, consistently complementing the global solutions. Networks of clocks will enable the direct determination of the gravitational potential at short time scales and at different length scales, which will stabilize resulting geoid solutions. The new class of gravity field models will serve as input for further geodetic applications in the context of the Global Geodetic Observing System (GGOS) and will be the basis for Earth system research in the geosciences.

Projects in RA C