Finished Research Projects

  • Evaluation of CAI gradiometer for the gravity field determination
    The successful GOCE (Gravity field and steady-state Ocean Circulation Explorer) mission has demonstrated that the satellite gravity gradiometry can significantly improve our knowledge on the Earth’s gravity field, especially in the medium- and short-wavelength parts. However, the electrostatic gradiometer on-board GOCE satellite is not technically perfect because of the widely-known 1/f noise in the low-frequency parts of measurements. Comparatively, the Cold Atom Interferometry (CAI) based gradiometer has flat noise down to the very-low frequency part, and shows a very long-term stability as well. In this project, our tasks are to rigorously map the CAI gradiometer’s noise to Earth’s gravity field coefficients through closed-loop simulations, where a similar mission scenario as GOCE will be taken to study a one-axis and a three-axis CAI gradiometer in the nadir Earth-pointing mode.
    Leaders: Prof. Dr.-Ing. Jürgen Müller
    Team: Dr. Karim Douch, Dr.-Ing. Hu Wu
    Year: 2016
    Sponsors: European Space Agency (ESA)
    Lifespan: 2016-2017
  • Regional gravity field modeling & relativistic geodesy (CRC 1128, C04)
    Leaders: Dr.-Ing. Heiner Denker
    Team: Dr.-Ing. Miao Lin
    Year: 2014
    Sponsors: Deutsche Forschungsgemeinschaft (DFG)
    Lifespan: 01.07.2014 – 30.06.2018
  • International Timescales with Optical Clocks (ITOC) /Researcher Excellence Grant (REG) „Gravity Potential for Optical Clock Comparisons“
    Leaders: Dr. Helen S. Margolis, Dr.-Ing. Heiner Denker
    Team: Dr.-Ing. Heiner Denker, Dr.-Ing. Ludger Timmen, Dr.-Ing. Christian Voigt
    Year: 2013
    Sponsors: European Metrology Research Programme (EMRP), jointly funded by the EMRP participating countries within EURAMET and the European Union
    Lifespan: 01.07.2013 – 31.03.2016
  • The recovery of Earth’s global gravity field from GOCE observations
    The ESA’s GOCE (Gravity field and steady-state Ocean Circulation Explorer) mission was the first to jointly apply SGG (satellite gravity gradiometry) and SST-hl (satellite-to-satellite high-low tracking) techniques to map the Earth’s gravity field. It delivered hundreds of millions of observations in four years’ lifetime, from 2009 to 2013. My Ph.D work is to recover a global gravity field model that is described by 62,997 spherical harmonic coefficients (up to degree/order 250) from the huge amount of GOCE observations.
    Leaders: Prof. Dr.-Ing. Jürgen Müller
    Team: Dr.-Ing. Hu Wu
    Year: 2011
    Sponsors: Stipendium
    Lifespan: 2011-2016
  • REaldatenAnaLyse GOCE (REAL GOCE)
    Teilprojekt GOCE Cal/Val, Quasigeoid und Höhensystem in Deutschland
    Leaders: Dr.-Ing. Heiner Denker, Prof. Dr.-Ing. Jürgen Müller (IfE-Anteil WP310)
    Team: Dr.-Ing. Phillip Brieden, Dr.-Ing. Focke Jarecki, Dr.-Ing. Christian Voigt, Dr.-Ing. Karen Insa Wolf
    Year: 2009
    Sponsors: Sonderprogramm GEOTECHNOLOGIEN, gefördert vom Bundesministerium für Bildung und Forschung (BMBF) und der Deutsche Forschungsgemeinschaft (DFG), Förderkennz. 03G0726C
    Lifespan: 01.06.2009 – 31.05.2012
  • GOCE-GRavitationsfeldANalyse Deutschland – GOCE-GRAND II WP220 – Regionales Validierungs- und Kombinationsexperiment
    Within the framework of the project, high-quality validated terrestrial gravity field data sets (in particular deflections of the vertical and gravity data) were generated in Germany and Europe for the external validation of GOCE products. These data were used for the validation of existing satellite gravity models on the one hand and for the calculation of corresponding combined quasigeoid solutions for Germany and Europe on the other hand.
    Leaders: Dr.-Ing. Heiner Denker (WP220 - IfE)
    Team: Dr.-Ing. Christian Voigt
    Year: 2005
    Sponsors: Research and development programme GEOTECHNOLOGIEN, funded by the Federal Ministry of Education and Research (BMBF) and the German Research Foundation (DFG), Förderkennz. 03F0421D
    Lifespan: 01.09.2005 – 31.08.2008
  • Fennoskandische Landhebung
    Ein Test- und Anwendungsgebiet für GRACE
    Leaders: Prof. Dr.-Ing. Jürgen Müller, Dr.-Ing. Ludger Timmen, Dr.-Ing. Heiner Denker
    Team: Dr.-Ing. Olga Gitlein
    Year: 2003
    Sponsors: Deutsche Forschungsgemeinschaft (DFG)
    Lifespan: 15.3.2003 bis 28.2.2009
  • Kombination von CHAMP- und regionalen terrestrischen Schwerefelddaten
    Evaluierung und optimalen Kombination verschiedener Schwerefelddatensätze in Europa.
    Leaders: Dr.-Ing. Heiner Denker, Prof. Dr.-Ing. Günter Seeber
    Team: Dr.-Ing. Markus Roland
    Year: 2001
    Sponsors: Deutsche Forschungsgemeinschaft (DFG)
    Lifespan: 01.05.2001 – 30.04.2004