Gregor Möller
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View article: Synergy of GNSS Tomography and Radio Occultation: Methods for Assimilating Refined Water Vapor Fields
Synergy of GNSS Tomography and Radio Occultation: Methods for Assimilating Refined Water Vapor Fields Open
Global Navigation Satellite Systems (GNSS) tomography is a rapidly developing method in meteorology that provides 3D grid-based information about water vapour distribution in the lower troposphere. The standard tomographic solutions are de…
View article: From ground- to space-based GNSS tomography - initial results and concepts
From ground- to space-based GNSS tomography - initial results and concepts Open
Monitoring the Earth's atmosphere is a fundamental activity aimed at understanding its structure and the processes occurring within it. These efforts contribute significantly to improving the quality of numerical weather models and forecas…
View article: Enhancing PPP Performance with Multi-GNSS Satellite Products and Integer Ambiguity Resolution
Enhancing PPP Performance with Multi-GNSS Satellite Products and Integer Ambiguity Resolution Open
In recent decades, Precise Point Positioning (PPP) has become a well-established GNSS positioning method that is used in various applications. PPP is characterized by the use of precise satellite products (satellite orbits, clocks, and bia…
View article: Imaging ionosphere using single-frequency GNSS data onboard nanosatellite missions
Imaging ionosphere using single-frequency GNSS data onboard nanosatellite missions Open
The Earth’s ionosphere is of considerable importance for medium- and long-range high-frequency communication, positioning, and over-the-horizon radar systems. Positioning and communication applications require new capabilities to und…
View article: Global Navigation Satellite System (GNSS) radio occultation climatologies mapped by machine learning and Bayesian interpolation
Global Navigation Satellite System (GNSS) radio occultation climatologies mapped by machine learning and Bayesian interpolation Open
Global Navigation Satellite System (GNSS) radio occultation (RO) is a space-based remote sensing technique that measures the bending angle of GNSS signals as they traverse the Earth's atmosphere. Profiles of the microwave index of refracti…
View article: Evaluation and Analysis of Next-Generation FY-4A LPW Products over Various Climatic Regions in China
Evaluation and Analysis of Next-Generation FY-4A LPW Products over Various Climatic Regions in China Open
Atmospheric water vapor, a significant constituent of the atmosphere, affects the energy balance between Earth’s atmosphere and space, and its changes play a crucial role in the greenhouse effect. Layer precipitable water (LPW), which repr…
View article: Determination of high-precision tropospheric delays using crowdsourced smartphone GNSS data
Determination of high-precision tropospheric delays using crowdsourced smartphone GNSS data Open
The Global Navigation Satellite System (GNSS) is a key asset for tropospheric monitoring. Currently, GNSS meteorology relies primarily on geodetic-grade stations. However, such stations are too costly to be densely deployed, which limits t…
View article: Comment on egusphere-2024-66
Comment on egusphere-2024-66 Open
Abstract. The Global Navigation Satellite System (GNSS) is a key asset for tropospheric monitoring. Currently, GNSS meteorology relies primarily on geodetic-grade stations. However, such stations are too costly to be densely deployed, whic…
View article: Comment on egusphere-2024-66
Comment on egusphere-2024-66 Open
Abstract. The Global Navigation Satellite System (GNSS) is a key asset for tropospheric monitoring. Currently, GNSS meteorology relies primarily on geodetic-grade stations. However, such stations are too costly to be densely deployed, whic…
View article: Assimilating UAV-based GNSS ZTDs for Numerical Weather Predictions
Assimilating UAV-based GNSS ZTDs for Numerical Weather Predictions Open
In recent decades, various studies have demonstrated that assimilating tropospheric parameters from ground-based GNSS receivers benefits numerical weather predictions (NWPs). However, the achieved performance is limited by the spatial reso…
View article: Smartphone PPP with the Galileo High Accuracy Service
Smartphone PPP with the Galileo High Accuracy Service Open
With the release of Android 7.0 in 2016, it became possible to retrieve raw GNSS measurement data from Android smartphones. The capability of directly accessing the GNSS measurements allows, among other things, a more reliable estimation o…
View article: Determination of High-Precision Tropospheric Delays Using Crowdsourced Smartphone GNSS Data
Determination of High-Precision Tropospheric Delays Using Crowdsourced Smartphone GNSS Data Open
The Global Navigation Satellite System (GNSS) is a key asset for tropospheric monitoring. Currently, GNSS meteorology relies primarily on geodetic-grade stations. However, such stations are too costly to be densely deployed, which limits t…
View article: Real-time navigation solutions of low-cost off-the-shelf GNSS receivers on board the Astrocast constellation satellites
Real-time navigation solutions of low-cost off-the-shelf GNSS receivers on board the Astrocast constellation satellites Open
With the ever-increasing number of small satellites launched into space, on-board orbit determination is becoming more and more important. Precise satellite positions are needed for constellation maintenance, formation flying, communicatio…
View article: Machine learning-based multipath modelling in spatial-domain: a demonstration on GNSS short baseline processing
Machine learning-based multipath modelling in spatial-domain: a demonstration on GNSS short baseline processing Open
Multipath is the main unmodeled error source hindering high-precision Global Navigation Satellite System (GNSS) data processing. Conventional multipath mitigation methods, such as sidereal filtering (SF) and multipath hemispherical map (MH…
View article: Low-cost and smartphone GNSS sensors: current capabilities and perspectives for seismic and tropospheric monitoring applications
Low-cost and smartphone GNSS sensors: current capabilities and perspectives for seismic and tropospheric monitoring applications Open
<p>In recent years, dual-frequency GNSS chipsets became available on the mass market. The ongoing developments in sensor and processing technologies steadily improve the positioning performance so that nowadays sub-decimeter accuraci…
View article: Tropospheric Parameter Estimation with Dual-Frequency GNSS Smartphones
Tropospheric Parameter Estimation with Dual-Frequency GNSS Smartphones Open
<p>With the introduction of the operating system Android 7 Nougat in the year 2016, it became possible to access the GNSS code and carrier phase observations on Android smartphones. These observations can now be processed with state-…
View article: Machine learning based multipath mitigation for high-precision GNSS data processing
Machine learning based multipath mitigation for high-precision GNSS data processing Open
<p>Multipath is the main unmodeled error source hindering high-precision GNSS (Global Navigation Satellite System) data processing. Classical multipath mitigation methods, such as sidereal filtering (SF) and multipath hemispherical m…
View article: Detection of Alpine Foehn in GNSS-ZWD time series: An innovative application of GNSS Meteorology
Detection of Alpine Foehn in GNSS-ZWD time series: An innovative application of GNSS Meteorology Open
<p>The atmospheric delay experienced by a signal of the Global Navigation Satellite System (GNSS) is proportional to the water vapour content along the signal path. This fact is typically exploited in GNSS Meteorology by introducing …
View article: Combination of ground-based and space-based GNSS tomography (2021-2025)
Combination of ground-based and space-based GNSS tomography (2021-2025) Open
<p>Global Navigation Satellite Systems (GNSS) sense the atmosphere remotely and provide low-cost, high-quality information about its state. Nowadays, radio occultation (RO) profiles from space platforms and tropospheric delays from g…
View article: GNSS tomography data for assimilation into the Weather Research and Forecasting model
GNSS tomography data for assimilation into the Weather Research and Forecasting model Open
The data set contains GNSS troposphere tomography estimations of 3D wet refractivity fields for a part of Central Europe (mostly Germany and Czech Republic), for the period of 29 May–14 June 2013 when heavy-precipitation events were observ…
View article: GNSS tomography data for assimilation into the Weather Research and Forecasting model
GNSS tomography data for assimilation into the Weather Research and Forecasting model Open
The data set contains GNSS troposphere tomography estimations of 3D wet refractivity fields for a part of Central Europe (mostly Germany and Czech Republic), for the period of 29 May–14 June 2013 when heavy-precipitation events were observ…
View article: Cross-Comparison and Methodological Improvement in GPS Tomography
Cross-Comparison and Methodological Improvement in GPS Tomography Open
GPS tomography has been investigated since 2000 as an attractive tool for retrieving the 3D field of water vapour and wet refractivity. However, this observational technique still remains a challenging task that requires improvement of its…
View article: National Status Reports
National Status Reports Open
In this section a summary of the national progress reports is given. GNSS4SWEC Management Committee (MC) members provided outline of the work conducted in their countries combining input from different partners involved. In the COST Action…
View article: Advanced GNSS Processing Techniques (Working Group 1)
Advanced GNSS Processing Techniques (Working Group 1) Open
Over the last decade, near real-time analysis of GPS data has become a well-established atmospheric observing tool, primarily coordinated by the EIG EUMETNET GPS Water Vapour Programme (E-GVAP) in Europe. In the near future, four operation…
View article: Assimilation of GNSS tomography products into the Weather Research and Forecasting model using radio occultation data assimilation operator
Assimilation of GNSS tomography products into the Weather Research and Forecasting model using radio occultation data assimilation operator Open
From Global Navigation Satellite Systems (GNSS) signals, accurate and high-frequency atmospheric parameters can be determined in all-weather conditions. GNSS tomography is a technique that takes advantage of these parameters, especially of…
View article: Assimilation of GNSS tomography products into WRF using radio occultation data assimilation operator
Assimilation of GNSS tomography products into WRF using radio occultation data assimilation operator Open
From Global Navigation Satellite Systems (GNSS) signals, accurate and high-frequency atmospheric parameters can be determined in all-weather conditions. GNSS tomography is a novel technique that takes advantage of these parameters, especia…
View article: Atmospheric bending effects in GNSS tomography
Atmospheric bending effects in GNSS tomography Open
In Global Navigation Satellite System (GNSS) tomography, precise information about the tropospheric water vapor distribution is derived from integral measurements like ground-based GNSS slant wet delays (SWDs). Therefore, the functional re…
View article: Cross-validation of GPS tomography models and methodological improvements using CORS network
Cross-validation of GPS tomography models and methodological improvements using CORS network Open
Using data from the Continuously Operating Reference Stations (CORS), recorded in March 2010 during severe weather in the Victoria State, in southern Australia, sensitivity and statistical results of GPS tomography retrievals (water vapour…
View article: Atmospheric bending effects in GNSS tomography
Atmospheric bending effects in GNSS tomography Open
In GNSS tomography, precise information about the tropospheric water vapor distribution is derived from integral measurements like GNSS slant wet delays (SWDs). Therefore, the functional relation between observations and unknowns, i.e. the…