Leibniz Universität Hannover Faculty Faculty of Civil Engineering and Geodetic Science
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Institute of Geodesy
 
Institute of Geodesy Institute Team Steffen Schön Research Projects
Finished Research Projects

Finished Research Projects

GNSS and Inertial Navigation

  • 5GAPS: 5G Access to Public Spaces
    In this research project, the positioning capabilities of the latest mobile communication standard 5G NR are investigated. Due to the increasing demand for communication and the widespread installation of 5G NR networks, terrestrial signal sources can provide an alternative or complement to GNSS signals when GNSS signals are unavailable or a limited by the environment.
    Led by: Prof. Dr.-Ing Steffen Schön
    Team: Kai-Niklas Baasch, M.Sc.
    Year: 2022
    Funding: Federal Ministry of Transport and Digital Infrastructure (BMDV), grant number: 45FG121_F
  • Correction of GNSS multipath effects for reliable autonomous localisation of highly automated vehicles in metropolitan areas (KOMET)
    The code range (code measurement) used in automotive applications often cannot provide the required resolution of the location due to the high measurement noise. The complex GNSS signal propagation (signal shading, multipath effects) in urban environments makes the determination of an accurate and robust positioning solution a particularly challenging task - e.g. for positioning in narrow street canyons. The research project aims to develop and implement innovative correction methods to reduce multipath effects in order to improve carrier phase-based GNSS positioning.
    Led by: Prof. Dr.-Ing. Steffen Schön, Dr.-Ing. Tobias Kersten
    Team: Dr.-Ing. Tobias Kersten, M.Sc. Fabian Ruwisch
    Year: 2020
    Funding: BMWi / TÜV Rheinland Consulting GmbH
    © Ch. Skupin (Bosch)
  • QGyro: Quantum Optics Inertial Sensor Research
    The objective of this research programme is to develop and test high-precision quantum inertial sensors that support conventional inertial navigation sensors in order to expand these sensors to up to 6 degrees of freedom and use them for autonomous navigation in various further development stages.
    Led by: Prof. Dr.-Ing. Steffen Schön
    Team: M.Sc. Benjamin Tennstedt, Dr.-Ing. Tobias Kersten
    Year: 2019
    Funding: Federal Minitry of Economics and Climate Affairs (BMWK / DLR), grant number: 50RK1957
    Duration: 2019 - 2022
  • Integrity Monitoring for Network RTK Systems
    From the advent of the satellite positioning techniques, civil users have always been trying to find a way to have more accurate and precise coordinates of their position. Differential concepts, from early days of GPS, have been considered. Applying the RTCM format, made the transmission of corrections possible from reference stations to the users. At first stage the corrections were casted to the users from one single station, which is called single RTK (Real Time Kinematic). This method is limited in some ways; degrading by increasing distance from CORS (Continuously Operating Reference Station), needed same signals at reference and rover and remaining the reference station errors. For compensating these shortages, the Network RTK concept appeared. In NRTK the corrections are produced using a network (at least three) of reference stations. The concept of Precise Point Positioning (PPP) is currently associated with global networks. Precise orbit and clock solutions are used to enable absolute positioning of a single receiver. However, it is restricted in ambiguity resolution, in convergence time and in accuracy. Precise point positioning based on RTK networks (PPP-RTK) overcomes these limitations and gives centimeter-accuracy in a few seconds.
    Led by: Prof. Dr.-Ing. Steffen Schön
    Team: Ali Karimidoona, M. Sc.
    Year: 2018
    Funding: German Academic Exchange Service (DAAD)
  • Kinematic GNSS positioning of Low Earth Orbiters (CRC 1128, B03)
    Strengthening the accuracy of kinematic orbits of Low Earth Orbiters through an adopted Precise Point Positioning (PPP) enhanced by GNSS Receiver Clock Modeling and the concept of a Virtual Receiver is the overall objective of this project.
    Led by: Prof. Dr.-Ing. Steffen Schön
    Team: M.Sc. Christoph Wallat
    Year: 2014
    Funding: DFG
  • Turbulence investigations and improved modelling of atmospheric refraction with VLBI and GNSS
    Improved characterization of refractivity fluctuations, determination of turbulence parameters and enhanced modelling of neutrospheric refraction effects
    Led by: Prof. Dr.-Ing. Steffen Schön
    Team: Dipl.-Ing. Franziska Kube
    Year: 2012
    Funding: DFG (SCHO 1314/3-1)
  • Verbesserte Positionierung und Navigation durch konsistente Multi-GNSS Antennenkorrekturen
    Investigation of effects of code phase delays (GDV) on the GNSS-based positioning and navigation as well as the development of a method for an adequate comparison of different calibration results.
    Led by: Prof. Dr.-Ing. Steffen Schön
    Team: Dipl.-Ing. Tobias Kersten
    Year: 2012
    Funding: BMWI | 50NA1216
  • Bürgernahes Flugzeug
    Improvement of quality and decrease of signal loss during GNSS-based curved landing approaches as part of the development of a "Metropolitain Aircraft".
    Led by: Prof. Dr.-Ing. Steffen Schön
    Team: Dipl.-Ing. Franziska Kube
    Year: 2011
    Funding: Government of Lower Saxony
  • Navigation und Positionierung in difficult enviornments
    Analyse of High-Sensitivity GNSS Sensors
    Led by: Prof. Dr.-Ing. Steffen Schön
    Team: Dipl.-Ing. Olaf Bielenberg
    Year: 2011
  • Modelling physical correlation of GNSS phase observations by means of turbulence theory
    Modelling of physikal Correlations on GNSS Phase Observables using the Approach of turbulence theory
    Led by: Prof. Dr.-Ing. Steffen Schön
    Team: Dr.-Ing. Markus Vennebusch
    Year: 2011
    Funding: DFG (SCHO 1314/1-1).
  • Modeling and correction of GNSS multipath effect through Software receiver and Ray tracing
    Describing Multipath by Software receiver and Ray tracing.
    Led by: Prof. Dr.-Ing. Steffen Schön
    Team: M.Sc. Marios Smyrnaios
    Year: 2011
    Funding: BMWI and German Aerospace Center (DLR)
  • Investigations of distance dependent systematic effects
    Correction models for distance dependent effects in small GPS networks
    Led by: Dr.-Ing. Steffen Schön
    Team: Dr.-Ing. Steffen Schön
    Year: 2006
  • Assessment of remaining systematic effects by interval mathematics
    Assessment of remaining systematic effects by interval mathematics
    Led by: Prof. Dr.-Ing. Steffen Schön
    Year: 2006
    Funding: Deutsche Forschungsgemeinschaft (DFG)

CRC 1128 (geo-Q)

  • Kinematic GNSS positioning of Low Earth Orbiters (CRC 1128, B03)
    Strengthening the accuracy of kinematic orbits of Low Earth Orbiters through an adopted Precise Point Positioning (PPP) enhanced by GNSS Receiver Clock Modeling and the concept of a Virtual Receiver is the overall objective of this project.
    Led by: Prof. Dr.-Ing. Steffen Schön
    Team: M.Sc. Christoph Wallat
    Year: 2014
    Funding: DFG

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