Current Research Projects

  • Gewinn eines grundlegenden Verständnisses der Mehrwege - Antennen - Empfänger - Interaktionen zur Standardisierung der Kalibrierung von Codephasenvariationen von GNSS-Empfangsantennen
    Led by: Prof. Dr.-Ing. Steffen Schön, Dr.-Ing. Tobias Kersten
    Team: Yannick Breva
    Year: 2022
    Funding: DFG, Project number: 470510446
  • 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. Gesine Grosche
    Team: Dr. Alexander Kuhl, Dr. Thomas Waterholter, Ahmed Elmaghraby
    Year: 2021
    Funding: DFG
  • 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)
  • FIRST: Fingerprinting, Integrity Monitoring and Receiver Signal Processing Using Miniature Atomic Clock Technology
    In order to improve the performance of the determination of position, velocity and time by means of GNSS measurements, nowadays Chip Scale Atomic Clocks (CSACs) are frequently used, which provide a highly stable frequency signal to the GNSS receiver. However, until now, the improvement of the navigation solution has only been algorithmic. In this project, the influence of the receiver clock on the quality of signal processing in a software receiver will be investigated by adapting the internal processing steps to the high frequency stability of the CSAC signal. In addition, the feasibility of fingerprinting with highly stable atomic clocks under different dynamic conditions will be investigated and additional integrity measures for GNSS-based time transfer will be developed.
    Led by: Prof. Dr.-Ing. Steffen Schön
    Team: Dennis Kulemann, M. Sc., Qianwen Lin, M. Sc.
    Year: 2020
    Funding: Bundesministerium für Wirtschaft und Energie (BMWi)
  • Collaborative Navigation for Smart Cities (GRK 2159)
    Global Navigation Satellite Systems (GNSS) is the only navigation sensor that provides absolute positioning. However, urban areas form the most challenging environment for GNSS to achieve a reliable position. Because of the reduced satellite visibility and disturbed signal propagation like diffraction and multipath, the resulting position has a reduced accuracy and availability. The overall research objective of this project is to reduce these shortcomings through collaboration. Therefore, similarity of multipath at different locations within streets will be studied.
    Led by: Prof. Dr.-Ing. Steffen Schön
    Team: Lucy Icking, M.Sc.
    Year: 2019
    Funding: DFG
  • 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: BMWi | German Aerospace Centre (DLR) - 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: DAAD