• Traceability of the Hannover FG5X-220 to the SI units 

  Schilling, Manuel; Timmen, Ludger (2015-06-22)

  The absolute measurement of g is currently realized through the laser interferometric measurement of a free falling retro-reflector. The Micro-g LaCoste FG5X is a free-fall gravimeter with a laser interferometer in ...
• Accuracy estimation of the IfE gravimeters Micro-g LaCoste gPhone-98 and ZLS Burris Gravity Meter B-64 

  Schilling, Manuel; Gitlein, Olga (Cham : Springer, 2015-06-20)

  Presently, modern spring gravimeters are the most flexible, technically simple, and comparatively cheap solution for recordings over extended time periods in contrast to superconducting gravimeters. We investigate the ...
• Continuous Navigation of an Inland Vessel with a Synthetic GNSS Antenna 

  Kersten, Tobias; Ren, Le; Schön, Steffen (Bonn : DGON, 2018-11-15)

  This paper describes a concept to obtain a continuous navigation and position solution of inland vessels based on a multi-GNSS antenna system. Also known as, “Virtual Receiver” we utilize this approach as an alternative ...
• A Virtual Receiver Concept for Continuous GNSS based Navigation of Inland Vessels 

  Kersten, Tobias; Ren, Le; Schön, Steffen (Noordwijk, The Netherlands : ESA/ESTEC, 2018-12-06)

  Efficient and economic guidance of inland vessels relies on a continuous, available, reliable and precise GNSS navigation solution. Hence, below other side effects, this is especially critical when passing beneath bridges ...
• Solute Transport in Heterogeneous Soil with Time-Dependent Boundary Conditions 

  Cremer, Clemens J.M.; Neuweiler, Insa; Bechtold, Michel; Vanderborght, Jan (McLean, VA : GeoScienceWorld, 2016)

  We investigate the effect of dynamic boundary conditions on solute transport in unsaturated, heterogeneous, bimodal porous media. Solute transport is studied with two-dimensional numerical flow and transport models for ...
• A systematic approach to offshore wind turbine jacket predesign and optimization: geometry, cost, and surrogate structural code check models 

  Häfele, Jan; Damiani, Rick R.; King, Ryan N.; Gebhardt, Cristian G.; Rolfes, Raimund (Oldenburg : European Academy of Wind Energy (EAWE), 2018)

  The main obstacles in preliminary design studies or optimization of jacket substructures for offshore wind turbines are high numerical expenses for structural code checks and simplistic cost assumptions. In order to create ...
• Thermal IR imaging: Image quality and orthophoto generation 

  Sledz, A.; Unger, J.; Heipke, C. (London : International Society for Photogrammetry and Remote Sensing, 2018)

  This paper deals with two aspects of photogrammetric processing of thermal images: image quality and 3D reconstruction quality. The first aspect of the paper relates to the influence of day light on Thermal InfraRed (TIR) ...
• Systematic geometric image errors of very high resolution optical satellites 

  Jacobsen, K. (London : International Society for Photogrammetry and Remote Sensing, 2018)

  Very high resolution optical satellites are imaging the object space by a combination of CCD-lines in one direction and by time, speed and satellite rotation in the other direction. The combination of the CCD-lines usually ...
• Exploring ALS and DIM data for semantic segmentation using CNNs 

  Politz, F.; Sester, M. (London : International Society for Photogrammetry and Remote Sensing, 2018)

  Over the past years, the algorithms for dense image matching (DIM) to obtain point clouds from aerial images improved significantly. Consequently, DIM point clouds are now a good alternative to the established Airborne ...
• Identification of similarities and prediction of unknown features in an urban street network 

  Feuerhake, U.; Wage, O.; Sester, M.; Tempelmeier, N.; Nejdl, W.; Demidova, E. (London : International Society for Photogrammetry and Remote Sensing, 2018)

  Accurate predictions of the characteristics of urban streets in particular with respect to the typical traffic situations are crucial for numerous real world applications such as navigation, scheduling of logistic and ...
• Improved classification of satellite imagery using spatial feature maps extracted from social media 

  Leichter, A.; Wittich, D.; Rottensteiner, F.; Werner, M.; Sester, M. (London : International Society for Photogrammetry and Remote Sensing, 2018)

  In this work, we consider the exploitation of social media data in the context of Remote Sensing and Spatial Information Sciences. To this end, we explore a way of augmenting and integrating information represented by ...
• Coseismic deformation field of the Mw 7.3 12 November 2017 Sarpol-e Zahab (Iran) earthquake: A decoupling horizon in the Northern Zagros Mountains inferred from InSAR observations 

  Vajedian, S.; Motagh, M.; Mousavi, Z.; Motaghi, K.; Fielding, E.J.; Akbari, B.; Wetzel, H.-U.; Darabi, A. (Basel : MDPI AG, 2018)

  The study of crustal deformation fields caused by earthquakes is important for a better understanding of seismic hazard and growth of geological structures in tectonically active areas. In this study, we present, using ...
• A New Erosion Model for Wind-Induced Structural Vibrations 

  Yan, Keqin; Zhang, Yi; Cheng, Tao (Kairo : Hindawi, 2018)

  In recent years, computational fluid dynamics (CFD) method has been widely utilized in simulating wind-induced snow drifting. In the simulating process, the erosion flux is the main controlling factor which can be calculated ...
• GPS code phase variations (CPV) for GNSS receiver antennas and their effect on geodetic parameters and ambiguity resolution 

  Kersten, Tobias; Schön, Steffen (Berlin Heidelberg : Springer, 2017)

  Precise navigation and geodetic coordinate determination rely on accurate GNSS signal reception. Thus, the receiver antenna properties play a crucial role in the GNSS error budget. For carrier phase observations, a spherical ...
• Observed secular gravity trend at Onsala station with the FG5 gravimeter from Hannover 

  Timmen, L.; Engfeldt, A.; Scherneck, H.-G. (Berlin, Boston : De Gruyter, 2015)

  Annual absolute gravity measurements with a FG5 instrument were performed in Onsala Space Observatory by the Institute of Geodesy of the Leibniz Universität Hannover from 2003 to 2011 and have been continued with the ...
• Bestimmung von Codephasen-Variationen bei GNSS-Empfangsantennen und deren Einfluss auf die Positionierung, Navigation und Zeitübertragung 

  Kersten, Tobias (München : C.H. Beck, 2014-12)

  Die globale Positionierung, Navigation sowie Zeit- und Frequenzübertragung [positioning, navigation and timing] (PNT) ist in der heutigen Gesellschaft zu einem integralen Bestandteil des täglichen Lebens geworden, so dass ...
• 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. ...
• 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 ...
• Antenna specific IfE-robot based code phase delays and its impact on positioning and navigation 

  Kersten, Tobias; Schön, Steffen (Piscataway, NJ : IEEE, 2012)

  The Institut für Erdmessung (IfE) is an official IGS calibration institution, calibrating phase center variations (PCV) for receiver antennae routinely in the field, using the actual GNSS satellite signals in space. Current ...
• 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 ...

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