CRC 1464 (TerraQ)
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Terrestrial Clock Networks: Fundamental Physics and Applications (CRC 1464, C02)The continuous developments of optical clocks and the long-distance links via fibers, especially within TerraQ, will give access to terrestrial clock networks in practice, which will enable the novel measurement concept of chronometric levelling. From a theoretical perspective, this project will elaborate the rigorous relativistic formalism for clock-based geodesy and assess the effects of approximations in different scenarios. Furthermore, this project will figure out the most promising applications for clock networks in geodesy and fundamental physics.Led by: Prof. Dr.-Ing. Jürgen Müller, Prof. Dr. Claus LämmerzahlTeam:Year: 2021Funding: DFG
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Interferometric Fibre Links (CRC 1464, A05)The overarching goal, to establish chronometric levelling as a routine tool for geodesy, requires research and developments for high precision frequency transfer in the areas of Interferometric Fibre Links (IFLs) and Global Naviation Satellite System - Frequency Transfer (GNSS-FT). The development of fieldable IFLs equipment, ultraprecise GNSS-FT and their use for chronometric levelling, are new areas of research and development, which will open up many applications of geodetic interest. We aim to realise an island-mainland chronometric levelling campaign using IFL and GNSS-FT, and the transportable optical clocks developed in A04.Led by: Prof. Dr.-Ing. Steffen Schön, Dr. Jochen KronjägerTeam:Year: 2021Funding: DFG
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Optical Clocks for Chronometric Levelling (CRC 1464, A04)We will realise the potential of chronometric levelling by demonstrating off-campus height measurements with the same or better resolution than geometric levelling and the Global Navigation Satellite System (GNSS)/geoid approach can presently achieve, in joint campaigns with project A05. This demonstration will be strengthened by the application of our measurement capabilities to geodetic problems of high relevance through cooperation with the TerraQ projects employing gravimetric and GNSS techniques to e.g. monitor water storage and other mass changes (projects Terrestrial Clock Networks: Fundamental Physics and Applications (C02), Modelling of Mass Variations Down to Small Scales by Quantum Sensor Fusion (C05), and Atmosphere-Ocean Background Modelling for Terrestrial Gravimetry (C06)).Led by: PD Dr. Christian Lisdat, Prof. Dr. Piet O. Schmidt, Dr.-Ing. DenkerTeam:Year: 2021Funding: DFG
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Validation of Quantum Gravimeter QG-1 for Hydrology (CRC 1464, C01)For the groundwater management in central Europe, ground-based gravimetry provides a unique potential to monitor temporal variations in the subsurface water content for local areas. The atomic Quantum Gravimeter-1 (QG-1) of Leibniz Universität Hannover (LUH) is in its final phase of development (A01) and will be ready for geodetic and gravimetric applications latest in 2021. The QG-1 capability will be demonstrated indoor and also in a field application as an advanced absolute gravimeter allowing effectively the surveying of gravity variations due to groundwater changes on the uncertainty level of 10 nm/s².Led by: Dr.-Ing. Heiner Denker, Dr.-Ing. Ludger TimmenTeam:Year: 2021Funding: DFG
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Gravity Field Solution by Exploiting the Full Potential of GRACE Follow-On (SFB 1464, C04)The overall aim of this project is to take maximum advantage of the data of the GRACE and GRACE-FO missions and derive the best possible time-variable gravity field with monthly and daily solution. We anticipate an increased spatial resolution and a reduction of systematic errors due to improved background modelling and co-estimation of geophysical and instrumental parameters.Led by: Dr. Matthias Weigelt, Prof. Dr.-Ing. Torsten Mayer-GürrTeam:Year: 2021Funding: DFG
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Atmosphere-Ocean Background Modelling for Terrestrial Gravimetry (CRC 1464, C06)We will focus on the development of global background models of atmosphere and ocean dynamics that are applicable to gravity records taken anywhere at the Earth’s surface. The background models will be split into deformation effects that also consider the laterally heterogeneous rheology of the Earth’s crust, regional-to-global attraction effects of both atmospheric and oceanic mass variability along the strategy outlined by, and the local effects from the direct vicinity of the sensor that are most sensible to the local topographic roughness and that might benefit most from a possible augmentation with barometric observations taken around the gravity sensor.Led by: Dr. Henryk Dobslaw, Dr.-Ing. Ludger TimmenTeam:Year: 2021Funding: DFG
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Modelling of Mass Variations Down to Small Scales by Quantum Sensor Fusion (CRC 1464, C05)Observing the temporal variations of the Earth gravity field by satellite gravimetry, terrestrial gravimetry or loading time series via GNSS gives insight into the temporal and spatial changes in the distribution of water on various scales. The overall aim of this project is to develop models of regional time-variable gravity (or, equivalently, of total water storage variations) at uttermost high spatial and temporal resolution by the consistent integration of the various geodetic sensors. The project thus tackles one of the currently most pressing challenges in geodesy and its dependent geophysical applications.Led by: Prof. Dr.-Ing. Annette Eicker, Prof. Dr. Andreas Günther, Dr. Matthias WeigeltTeam:Year: 2021Funding: DFG
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New Measurement Concepts with Laser Interferometers (CRC 1464, B01)We will study a new type of optical accelerometer (ACC) and gradiometer, advance Laser Ranging Interferometry (LRI) technology conceptually to enable new satellite constellations, and investigate observations of the angular line-of-sight velocity for gravity field recovery with simulations.Led by: Prof. Dr.-Ing. Jürgen Müller, Dr. Vitali MüllerTeam:Year: 2021Funding: DFGDuration: 2021-2024
Satellite Gravimetry
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New Measurement Concepts with Laser Interferometers (CRC 1464, B01)We will study a new type of optical accelerometer (ACC) and gradiometer, advance Laser Ranging Interferometry (LRI) technology conceptually to enable new satellite constellations, and investigate observations of the angular line-of-sight velocity for gravity field recovery with simulations.Led by: Prof. Dr.-Ing. Jürgen Müller, Dr. Vitali MüllerTeam:Year: 2021Funding: DFGDuration: 2021-2024
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Hybridization of Classic and Quantum Accelerometers for Future Satellite Gravity MissionsUsing cold atom interferometry (CAI) accelerometers in the next generation of satellite gravimetry missions can provide long-term stability and precise measurements of the non-gravitational forces acting on the satellites. This allows for a reduction of systematic effects in current GRACE-FO gravity field solutions. In this project, we first aim to investigate the hybridization of quantum CAI-based and classical accelerometers for a GRACE-like mission and we discusse the performance improvement through dedicated simulations. Then we investigate different orbital configurations and mission concepts to find the optimal setting for future satellite gravimetry missions.Led by: Prof. Dr.-Ing. MüllerTeam:Year: 2020
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Earth System Mass Transport Mission (e.motion)Led by: Jakob FluryYear: 2013
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