Research Projects | Geodetic Space Sensor Technology and Gravity Field

  • COST-G: International Combination Service for Time-variable Gravity Field Solutions
    COST-G ist ein zukünftiges Produktzentrum des IGFS (International Gravity Field Service), welches das Ziel hat kombinierte monatliche Schwerefelder bereitzustellen. Hierbei werden die von den einzelnen Analysezentren berechneten Normalgleichungsmatrizen der Schwerefeldparameter aufbauend auf eigens für den Service definierten Qualitätsmerkmalen empirisch gewichtet, gelöst und validiert.
    Leaders: Prof. Jakob Flury
    Team: M.Sc. Igor Koch
    Year: 2019
  • Interactions of Low-orbiting Satellites with the Surrounding Ionosphere and Thermosphere Part II (INSIGHT II)
    At our Institute, we provide reduced and calibrated Swarm accelerometer data for the ESA Swarm data processing chain that are the basis for the determination of thermospheric density. This includes the accelerometer calibration by precise orbit determination of Swarm satellites.
    Leaders: Prof. Dr.-Ing. Jakob Flury
    Team: Dr.-Ing. Akbar Shabanloui
    Year: 2018
    Sponsors: DFG
    Lifespan: 2018-2021
  • Gravity field recovery from satellite-to-satellite tracking data
    Das Institut für Erdmessung berechnet und publiziert globale monatliche Schwerefelder aus Sensordaten der Multisatellitenmission GRACE. Zentrale Aspekte der Schwerefeldbestimmung und Forschungsgegenstand dieses Projektes sind die Sensorfusion, die Modellierung von konservativen und nicht-konservativen Störkräften, die numerische Integration der Satellitenbewegung, die Anpassung von modellierten Satellitenbahnen an Beobachtungen durch iterative Schätzverfahren, sowie die Parametrisierung der Satellitenbewegung.
    Leaders: Prof. Jakob Flury
    Team: M.Sc. Igor Koch
    Year: 2018
    © IfE / I. Koch
  • 3D Earth – A Dynamic Living Planet
    The goal of 3D-Earth is to establish a global 3D reference model of the crust and upper mantle based on the analysis of satellite gravity e.g. GOCE and (electro-)magnetic missions e.g. Swarm in combination with seismological models and analyse the feedback between processes in Earth’s deep mantle and the lithosphere. Selected case examples will provide the possibility to test these approaches on a global and regional scale. This will result in a framework for consistent models that will be used to link the crust and upper mantle to the dynamic mantle.
    Leaders: Prof. Dr.-Ing. Jakob Flury
    Team: Dr.-Ing. Akbar Shabanloui
    Year: 2017
    Sponsors: ESA
    Lifespan: 2017-2019
  • Swarm ESL/DISC: Support to accelerometer data analysis and processing
    Leaders: Prof. Dr.-Ing. Jakob Flury
    Team: Dr.-Ing. Sergiy Svitlov, Dr.-Ing. Akbar Shabanloui
    Year: 2016
    Sponsors: ESA (DTU Space)
    Lifespan: 2016-2020
  • European Gravity Service for Improved Emergency Management (EGSIEM)
    Massenänderungen, abgeleitet aus der Mission GRACE (Gravity Recovery And Climate Experiment), liefern grundlegende Einblicke in den globalen Wasserkreislauf der Erde. Änderungen in der kontinentalen Wasser-speicherung steuern den regionalen Wasserhaushalt und können in Extremfällen zu Überschwemmungen und Dürren führen. Das Ziel von EGSIEM ist, den Wasserkreislauf der Erde aus dem Weltall mit hoher zeitlicher und räumlicher Auflösung zu beobachten und vorherzusagen.
    Leaders: Prof. Dr.-Ing. Jakob Flury
    Team: Dr.-Ing. Akbar Shabanloui
    Year: 2015
    Sponsors: European Commission (EC)
    Lifespan: 2015-2017
  • Disentangling gravitational signals and errors in global gravity field parameter estimation from satellite observations (SFB 1128, C01)
    Range-rate residuals from the estimation of global gravity field parameters from GRACE satellite-to-satellite tracking reveal a range of systematic effects that limit the accuracy of the estimated parameters. The project investigated the characteristics of time series of range-rate residuals. It addressed how drops in the K-band ranging signal-to-noise ratio at specific inter-satellite Doppler frequencies propagate to anomalies in range-rate residuals, as well as anomalies during penumbra transitions. A part of the project at TU Graz, in the group of Prof. Mayer-Gürr, studied options to use wavelet parameters in the SST gravity field parameter estimation.
    Leaders: Prof. Jakob Flury
    Team: M.Sc. Saniya Behzadpour
    Year: 2014
    Sponsors: DFG
    Lifespan: 2014-2018
  • Fusion of ranging, accelerometry, and attitude sensing in the multi-sensor system for laserinterferometric inter-satellite ranging (CRC 1128, B02)
    The quality of gravity field results obtained from GRACE and GRACE Follow-On inter-satellite ranging does not only depend on the ranging measurement accuracy. Equally important is the quality of the integration in the multi-sensor system consisting of inter-satellite ranging, GNSS orbit tracking, accelerometry, and attitude sensing, and the performance of this system as a whole. The system performance is influenced, e.g., by star camera attitude performance, by the characteristics of satellite pointing jitter coupling, by inaccurate knowledge and instabilities of phase centers and alignments, and by accelerometer signal disturbances.
    Leaders: Prof. Jakob Flury, Dr. Gerhard Heinzel
    Team: M.Sc. Santoshkumar Burla, Henry Wegener, Dr. Akbar Shabanloui
    Year: 2014
    Sponsors: DFG
    Lifespan: 2014-2018
  • High performance satellite formation flight simulator (CRC 1128, B05)
    Leaders: Dr. Meike List (ZARM), Dr.-Ing. Benny Rievers (ZARM)
    Team: M.Sc. Guy Apelbaum, Dr. Takahiro Kato , Florian Wöske, Dr. Sergiy Svitlov, Dr. rer. nat. Ertan Göklü, Stefanie Bremer
    Year: 2014
    Sponsors: DFG
  • Earth System Mass Transport Mission (e.motion)
    Leaders: Jakob Flury
    Year: 2013
  • High-resolution modeling of geoid-quasigeoid separation
    Leaders: Prof. Dr.-Ing. Jakob Flury
    Year: 2013
  • Improved compensation of vibrational noise in the laser interferometer with applications in absolute gravimetry
    Leaders: Dr. Sergiy Svitlov
    Year: 2011
    Sponsors: DFG
    Lifespan: 2011 - 2018
  • Highly physical penumbra solar radiation pressure modeling with atmospheric effects
    During penumbra transitions of an Earth orbiter, the solar radiation hitting the satellite is strongly influenced by refraction and absorption of light rays grazing the Earth’s atmosphere. The project implemented solar radiation pressure modeling including these effects. Model results were tested by comparing with measurements of the accelerometers of the GRACE low Earth orbiters.
    Leaders: Prof. Jakob Flury, Tamara Bandikova
    Team: Robbie Robertson (Virginia Tech, Blacksburg, VA)
    Year: 2010
    Sponsors: RISE/QUEST
    Lifespan: 2010
  • In-Orbit System Analysis of the Gravity Recovery and Climate Experiment (GRACE) Mission
    Precise determination and control of satellite attitude plays a key role for satellite geodesy in general, and for Satellite-to-Satellite Tracking in particular. The project provided the first in-depth characterization of GRACE pointing biases and pointing variations. Investigations addressed star camera inter-boresight angle variations, the weighted camera sensor head combination, as well as error propagation to inter-satellite ranging and accelerometer observations. Results led to significant improvements in the operational GRACE data processing.
    Leaders: Prof. Jakob Flury
    Team: Tamara Bandikova
    Year: 2009
    Sponsors: Exzellenzcluster QUEST
    Lifespan: 2009-2015
    © IfE / Bandikova