Auflistung nach Schlagwort "GNSS"

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  • Improved GNSS navigation with chip-scale atomic clocks 
    Krawinkel, Thomas (München : Verlag der Bayerischen Akademie der Wissenschaften, 2018)
    The determination of position and time as well as navigation by means of a Global Navigation Satellite System (GNSS) is always based on one-way range measurements between satellites and receiver. Synchronization of their ...
  • Integrated GNSS Attitude Determination and Positioning for Direct Geo-Referencing 
    Nadarajah, Nandakumaran; Paffenholz, Jens-André; Teunissen, Peter J.G. (Basel : MDPI AG, 2014-07-17)
    Direct geo-referencing is an efficient methodology for the fast acquisition of 3D spatial data. It requires the fusion of spatial data acquisition sensors with navigation sensors, such as Global Navigation Satellite System ...
  • Integrity - A topic for photogrammetry? 
    Schön, Steffen (Katlenburg-Lindau : Copernicus Publications, 2020)
    Photogrammetric methods and sensors like LIDAR, RADAR and cameras are becoming more and more important for new applications like highly automatic driving, since they enable capturing relative information of the ego vehicle ...
  • Integrity and collaboration in dynamic sensor networks 
    Schön, Steffen; Brenner, Claus; Alkhatib, Hamza; Coenen, Max; Dbouk, Hani; Garcia-Fernandez, Nicolas; Fischer, Colin; Heipke, Christian; Lohmann, Katja; Neumann, Ingo; Nguyen, Uyen; Paffenholz, Jens-André; Peters, Torben; Rottensteiner, Franz; Schachtschneider, Julia; Sester, Monika; Sun, Ligang; Vogel, Sören; Voges, Raphael; Wagner, Bernardo (Basel : MDPI AG, 2018)
    Global Navigation Satellite Systems (GNSS) deliver absolute position and velocity, as well as time information (P, V, T). However, in urban areas, the GNSS navigation performance is restricted due to signal obstructions ...
  • Intelligent Database Architecture for High-Integrity Urban Navigation 
    Ruwisch, Fabian; Ren, Le; Skupin, Christian; Kersten, Tobias; O'Connor, Marcus; Schön, Steffen; Wübbena, Temmo (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2022-06-05)
    Accuracy, integrity and availability requirements are very stringent in urban navigation and autonomous driving. The GNSS sensor is the only one that provides self-localisation in a global coordinate system. The challenge ...
  • Konzept und Analyse von Codephasenvatiationen für Multi-GNSS-Signale 
    Breva, Yannick; Kröger, Johannes; Kersten, Tobias; Schöne, Steffen (Stuttgart : Frontiers of Geodetic Science, 2019-09-19)
    Für hochpräzise GNSS-Anwendungen sind Trägerphasenmessungen unabdingbar. Bei solchen Messungen ist es notwendig die individuellen Antennenphasenzentrumskorrekturen (PCC) zu berücksichtigen. Ähnliche Korrekturen existieren ...
  • Multi-GNSS Receiver Antenna Calibration 
    Kröger, Johannes; Kersten, Tobias; Breva, Yannick; Schön, Steffen (Copenhagen : Fédération Internationale des Géométres, 2020)
    Global Navigation Satellite Systems (GNSS) are not only widely used for precise positioning, navigation and timing but also for establishing of terrestrial reference frames for geospatial applications, such as land and ...
  • On Adequate Comparison of Antenna Phase Center Variations 
    Schön, Steffen; Kersten, Tobias (Washington D.C. : American Geophysical Union, 2013)
    One important part for ensuring the high quality of the International GNSS Service's (IGS) products is the collection and publication of receiver - and satellite antenna phase center variations (PCV). The PCV are crucial ...
  • On the impact of Group Delay Variations on GNSS time and frequency transfer 
    Kersten, Tobias; Schön, Steffen; Weinbach, Ulrich (Piscataway, NJ : IEEE, 2012)
    Group Delay Variations (GDVs) are azimuth and elevation dependent code delays that can limit the accuracy of the GNSS code observables. This contribution focuses on the GDV determination and discusses several solutions ...
  • On the Limits of State-of-the-Art GNSS Receivers in Frequency Transfer 
    Krawinkel, Thomas; Schön, Steffen (Berlin ; Heidelberg : Springer, 2022)
    GNSS frequency transfer (FT) based on precise point positioning delivers instability values down to sub-10−16 between two modern receivers. In the present study we investigate the technical limits such receivers impose on ...
  • On the Role of GNSS Receivers for Antenna Patterns and Parameter Estimations 
    Kersten, Tobias; Kröger, Johannes; Breva, Yannick; Schön, Steffen (München : European Geosciences Union, 2021-04-27)
    The precise processing of data derived by several global navigation satellite systems (GNSS) for global and regional networks relies on high-quality and calibrated equipment. Currently, an intensively discussed question ...
  • Performance evaluation of GNSS receiver clock modelling in urban navigation using geodetic and high-sensitivity receivers 
    Jain, Ankit; Schön, Steffen (Cambridge : Cambridge Univ. Press, 2021)
    In urban areas, the Global Navigation Satellite System (GNSS) can lead to position errors of tens of meters due to signal obstruction and severe multipath effects. In cases of 3D-positioning, the vertical coordinate is ...
  • Performance of miniaturized atomic clocks in static laboratory and dynamic flight environments 
    Jain, Ankit; Krawinkel, Thomas; Schön, Steffen; Bauch, Andreas (Berlin [u.a.] : Springer, 2021)
    Miniaturized atomic clocks with high frequency stability as local oscillators in global navigation satellite system (GNSS) receivers promise to improve real-time kinematic applications. For a number of years, such oscillators ...
  • Phase Center Corrections for new GNSS-Signals 
    Kröger, Johannes; Breva, Yannick; Kersten, Tobias; Schön, Steffen (2019-04-09)
    Phase center corrections (including corrections for phase center offset and phase center variations) are nowadays mandatory for high accuracy GNSS applications. Currently, only L1- and L2 frequencies for GPS and GLONASS ...
  • Predicting C/N0 as a Key Parameter for Network RTK Integrity Prediction in Urban Environments 
    Karimidoona, Ali; Schön, Steffen (Basel : MDPI, 2023)
    Autonomuous transportation systems require navigation performance with a high level of integrity. As Global Navigation Satellite System (GNSS) real-time kinematic (RTK) solutions are needed to ensure lane level accuracy ...
  • Quality analysis of dual-frequency smartphone-based ionospheric tec measurements: What can be achieved? 
    Bruno, Jon; Darugna, Francesco; Bolmgren, Karl; Wübbena, Jannes B.; Mitchell, Cathryn; Schmitz, Martin (Bologna : Editrice Compositori, 2020)
    The growing quality of smartphone-based Global Navigation Satellite Systems (GNSS) chipsets opens a new frontier for scientific research in positioning, navigation and timing ap-plications. The portability and affordability ...
  • Receiver Antenna Phase Center Models and Their Impact on Geodetic Parameters 
    Kersten, Tobias; Schön, Steffen (Cham : Springer, 2016)
    Evaluating the impact of receiver antenna phase centre corrections (PCCs) in geodetic positioning and timing applications in a general way is quite challenging, because several estimation concepts, implementation philosophies ...
  • Recent Advances in Modelling Geodetic Time Series and Applications for Earth Science and Environmental Monitoring 
    He, Xiaoxing; Montillet, Jean-Philippe; Li, Zhao; Kermarrec, Gaël; Fernandes, Rui; Zhou, Feng (Basel : MDPI, 2022)
    Geodesy is the science of accurately measuring the topography of the earth (geometric shape and size), its orientation in space, and its gravity field. With the advances in our knowledge and technology, this scientific ...
  • Towards modeling phase center variations for multi-frequency and multi-GNSS 
    Kersten, Tobias; Schön, Steffen (Piscataway, NJ : IEEE, 2010)
    With the Hannover concept of absolute field calibration of GNSS antennae the determination of receiver antenna Phase Center Variations (PCV) can be done routinely for the GPS and GLONASS L1 and L2 frequencies, respectively. ...
  • Urbanes Monitoring erdfallinduzierter Deformationen: Grenzen und Chancen bei der Kombination von NSS, Nivellement und Gravimetrie 
    Kersten, Tobias; Weise, Adelheid; Timmen, Ludger; Gabriel, Gerald; Schön, Steffen; Vogel, Detlef (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2019)
    Senkungsvorgänge der Erdoberfläche stellen vor allem in urbanen Gebieten eine deutliche Gefährdung dar. Oftmals sind diese Senkungen durch Massenvariationen im Untergrund verursacht und führen zu langsamen, aber auch ...