A5055817452- GNSS positioning and interference
- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
- Radio Astronomy Observations and Technology
- Inertial Sensor and Navigation
- Advanced Frequency and Time Standards
- Astronomical Observations and Instrumentation
- Geophysics and Sensor Technology
- Calibration and Measurement Techniques
- Meteorological Phenomena and Simulations
- Radio Wave Propagation Studies
- Precipitation Measurement and Analysis
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- Superconducting and THz Device Technology
- Astrophysics and Cosmic Phenomena
- Soil Moisture and Remote Sensing
- Geomagnetism and Paleomagnetism Studies
- Scientific Measurement and Uncertainty Evaluation
- Astronomy and Astrophysical Research
- Particle accelerators and beam dynamics
- Statistical and numerical algorithms
- Atmospheric and Environmental Gas Dynamics
- earthquake and tectonic studies
- Oceanographic and Atmospheric Processes
Lantmäteriet
2018-2025
Swedish University of Agricultural Sciences
2023
GFZ Helmholtz Centre for Geosciences
2013-2020
University of Potsdam
2015
Karadeniz Technical University
2015
TU Wien
2009-2013
Chalmers University of Technology
2004-2010
Luleå University of Technology
2009
Swedish Institute of Space Physics
2005-2006
Up to now, state-of-the-art empirical slant delay modeling for processing observations from radio space geodetic techniques has been provided by a combination of two models. These are GPT (Global Pressure and Temperature) GMF Mapping Function), both operating on the basis long-term averages surface values numerical weather Weaknesses in GPT/GMF, specifically their limited spatial temporal variability, largely eradicated new, combined model GPT2, which provides pressure, temperature, lapse...
We have used 10 years of ground‐based data from the Global Positioning System (GPS) to estimate time series excess propagation path due gases in neutral atmosphere. first derive caused by water vapor which turn is infer content above each one 33 GPS receiver sites Finland and Sweden. Although a year period much too short search for climate change we use set assess stability consistency linear trend that can be estimated data. The trends integrated range −0.2 +1.0 kg m −2 decade −1 . As may...
The rapid development of multi-Global Navigation Satellite Systems (GNSSs, e.g., BeiDou, Galileo, GLONASS, and GPS) the International GNSS Service (IGS) Multi-GNSS Experiment (MGEX) brings great opportunities challenges for real-time determination tropospheric zenith total delays (ZTDs) integrated water vapor (IWV) to improve numerical weather prediction, particularly nowcasting or severe event monitoring. In this paper, we develop a multi-GNSS model fully exploit potential observations from...
A new realization of the International Celestial Reference Frame (ICRF) is presented based on work achieved by a working group Astronomical Union (IAU) mandated for this purpose. This follows initial ICRF completed in 1997 and its successor, ICRF2, adopted as replacement 2009. The frame, referred to ICRF3, nearly 40 years data acquired very long baseline interferometry at standard geodetic astrometric radio frequencies (8.4 2.3 GHz), supplemented with collected higher (24 GHz dual-frequency...
Global positioning system (GPS) tropospheric tomography normally requires that the slant wet delays between GPS satellites and ground receivers are estimated with high accuracy, which may be difficult given presence of a number error sources. This paper presents an alternative approach, namely to estimate three-dimensional structure atmospheric water vapor directly from raw phase observations. The method is tested in simulations, where impact network size, possible horizontal vertical...
Abstract In this study, we estimate integrated water vapor (IWV) trends from very long baseline interferometry (VLBI) and global navigation satellite systems (GNSS) data analysis, as well numerical weather models (NWMs). We study the impact of modeling parameterization tropospheric delay VLBI on IWV trends. address meteorological source utilized to model hydrostatic thermal deformation antennas, mapping functions employed project zenith delays arbitrary directions. To do so, derive a new...
In this paper, we demonstrate the advantage of applying a Kalman filter for parameter estimation in very-long-baseline interferometry (VLBI) data analysis. We present implementation VLBI software VieVS@GFZ. The performance is then investigated by looking at accuracy obtained various parameters, like baseline lengths, Earth Orientation Parameters, radio source coordinates, and tropospheric delays. results are compared to those when classical least squares method (LSM) applied estimation,...
We assess the impact of atmospheric turbulence on geodetic very long baseline interferometry (VLBI) through simulations delays. VLBI observations are simulated for two best existing data sets: The continuous campaigns CONT05 and CONT08. test different methods to determine magnitude above each station, i.e., refractive index structure constant C n 2 . results from analysis actually observed compared. find that today is largest error source VLBI. Accurate modeling necessary reach highest accuracy with
In connection with the work for next generation VLBI2010 Global Observing System (VGOS) of International VLBI Service Geodesy and Astrometry, a new scheduling package (Vie_Sched) has been developed at Vienna University Technology as part Software. addition to classical station-based approach it is equipped strategy based on radio sources be observed. We introduce different configurations source-based options investigate implications present future geodetic schedules. By comparison existing...
Abstract The tropospheric horizontal gradients with high spatiotemporal resolutions provide important information to describe the azimuthally asymmetric delays and significantly increase ability of ground‐based GNSS (Global Navigation Satellite Systems) within field meteorological studies, like nowcasting severe rainfall events. recent rapid development multi‐GNSS constellations has potential such high‐resolution a significant degree accuracy. In this study, we develop process for precise...
Summary Geodetic velocity models, derived from Global Navigation Satellite System (GNSS) solutions, interpolate between sparse GNSS measurements to provide a more comprehensive view of horizontal and vertical intraplate deformation. These models contribute improved assessment seismic volcanic hazards, assist in validating geodynamic enable the integration diverse datasets for Earth science studies. Most interpolation techniques are not adequate model distribution, especially velocities where...