A5077994807- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Ionosphere and magnetosphere dynamics
- Cryospheric studies and observations
- Methane Hydrates and Related Phenomena
- Inertial Sensor and Navigation
- Arctic and Antarctic ice dynamics
- Advanced Frequency and Time Standards
- Geology and Paleoclimatology Research
- earthquake and tectonic studies
- Geomagnetism and Paleomagnetism Studies
- Landslides and related hazards
- Climate variability and models
- Oceanographic and Atmospheric Processes
- Winter Sports Injuries and Performance
- Meteorological Phenomena and Simulations
- Polar Research and Ecology
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Geological Formations and Processes Exploration
- Statistical and numerical algorithms
- Time Series Analysis and Forecasting
- Superconducting Materials and Applications
- Scientific Measurement and Uncertainty Evaluation
- Soil Moisture and Remote Sensing
Federal Agency for Cartography and Geodesy
2011-2023
TU Dresden
2000-2014
Planet
2005-2010
During the 10 years since official start of International GNSS Service (IGS) in 1994 considerable improvements processing strategies and modeling global GPS solutions were achieved. Owing to changes at individual IGS Analysis Centers during these resulting time series geodetic parameters are very inhomogeneous inconsistent. A geophysical interpretation long realization a high‐accuracy reference frame therefore difficult questionable. In view deficiencies, Technical Universities Munich...
Dual frequency GPS observables only allow the elimination of 1st–order ionospheric term. Although higher–order terms may cause a range bias several centimeters, accounting for such effects is not yet common strategy data analysis. In comparison to previous investigations rigorous application 2nd and 3rd–order corrections examined estimation receiver positions but all included parameters. The results reveal linear dependence frame's origin on integrated electron density. Furthermore,...
[1] Land glacier extent and volume at the northern southern margins of Drake Passage have been in a state dramatic demise since early 1990s. Here time-varying space gravity observations from Gravity Recovery Climate Experiment (GRACE) are combined with Global Positioning System (GPS) bedrock uplift data to simultaneously solve for ice loss solid Earth glacial isostatic adjustment (GIA) Little Ice Age (LIA) cryospheric loading. The present-day rates determined be −26 ± 6 Gt/yr −41.5 9...
Abstract In contrast to previous studies validating numerical weather prediction (NWP) models using observations from the global positioning system (GPS), this paper focuses on validation of seasonal and interannual variations in water vapor. The main advantage performed is independence GPS vapor estimates compared datasets radiosondes or satellite microwave radiometers that are already assimilated into NWP models. Tropospheric parameters a reanalysis carried out common project Technical...
Abstract The increasing importance of terrestrial gravimetry in monitoring global change processes, providing a reference for satellite measurements and applications metrology necessitates stable system reflecting the measurement accuracy achievable by modern gravimeters. Therefore, over last decade, International Association Geodesy (IAG) has developed to achieve accurate, homogeneous, long-term recording Earth’s gravity, while taking advantage potential today’s absolute gravity...
Observations of the Global Positioning System (GPS) were reanalyzed over period from 1994 to 2004 in a joint project technical universities Dresden and Munich. The estimated tropospheric parameters converted into precipitable water (PW) using surface pressure observations World Meteorological Organization atmospheric mean temperature fields European Centre for Medium‐Range Weather Forecasts. For first time systematic study homogeneity global GPS‐derived series was carried out regarding...
A GPS network, consisting of 10 sites, was established in the ice-free area West Greenland and observed for first time 1995. In 2002 a complete re-observation carried out. These repeated observations served as basis determination vertical crustal deformations. The data analysis performed using Bernese Software version 5.0. For central site Kangerlussuaq negative uplift rate (subsidence) (−3.1 ± 1.1) mm yr−1 obtained, related to reference frame IGb00. regional pattern is characterized by an...
We present a GPS‐only reference frame named PDR05 (Potsdam‐Dresden‐Reprocessing TRF 2005) based on the results of homogeneous reprocessing global GPS network over time span 1994.0–2006.0. The is realized in center mass (CM) system. This implies that self‐consistent model considering and loading dynamics has been applied. determined set coordinates at epoch 2000.0 their linear changes with are evaluated terms self‐consistency compared to other realizations Terrestrial Reference System (TRS),...
During the summer of 2004, front area Jakobshavn Isbræ was monitored using a geodetic‐photogrammetric survey with temporarily coincident precise observations local ocean tides in Disko Bay close to Ilulissat. The geodetic and photogrammetric were conducted at southern margin glacier front. largest observed horizontal flow velocities are central part values up 45 m/d. This is factor 2 greater than average last century. Our new confirm previous estimates an acceleration during decade. provided...
Abstract A suitable representation of the regional gravity field is used to estimate relative offsets between national height system realizations in Europe. The method based on a gravimetric approach and benefits from significant improvements determination global by recent satellite missions Gravity Recovery Climate Experiment (GRACE) steady-state Ocean Circulation Explorerr (GOCE). potential these for unification reference frames analyzed terms accuracy spatial resolution. results are...
One major part in the error budget of GPS measurements is imperfect modeling tropospheric delay. By processing a global network 195 stations we have compared two different mapping techniques: (1) commonly used Niell hydrostatic function (NMF) and (2) isobaric (IMF) based on numerical weather fields. The solutions reveal significant differences derived zenith total delay (ZTD) parameters site positions. largest occur Antarctica, where annual mean heights differ by up to 15 mm. We infer that...
The regional key comparison of absolute gravimeters, EURAMET.M.G-K3 and the simultaneously organized additional comparison, was held in Germany at Geodetic Observatory Wettzell German Federal Agency for Cartography Geodesy spring 2018. Here we present list participants who actually performed measurements during data submitted by operators as well results determination gravity a function height sites. measurement strategy is briefly discussed harmonization documented. Finally, constrained...
ABSTRACT The German Antarctic Receiving Station (GARS) O’Higgins at the northern tip of Peninsula is a dual purpose facility for earth observation and has existed more than 20 years. It serves as satellite ground station payload data downlink telecommanding remote sensing satellites well geodetic observatory global reference systems change. Both applications use same 9 m diameter radio antenna. Major outcomes this usage are summarised in paper. (OHG) part network Remote Sensing Data Centre...