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Results of a GPS Zenith Total Delay data assimilation experiment over Italy
2023The Mediterranean area is often struck by severe weather events and deep convective events because of the presence of the warm sea, the complex orography of the area, and the specific synoptic scale environment. This scenario is worsened by climate change because, as climate change is affecting many weather and climate extremes, and the frequency and ...
Stefano Federico +4 more
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Variability and accuracy of Zenith Total Delay over the East African tropical region
Advances in Space Research, 2019The Global Navigation Satellite System (GNSS) can be used to derive accurately the Zenith Tropospheric Delay (ZTD) under all-weather conditions. The derived ZTDs play a vital role in climate studies, weather forecasting and are operationally assimilated into numerical weather prediction models. In this study, variations and statistical analysis of GNSS-
Ssenyunzi, Richard Cliffe (author) +6 more
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Computation of Zenith Total Delay Correction Fields Using Ground-Based GNSS
2015Tropospheric refraction is one of the major error sources in satellite-based positioning. The delay of radio signals caused by the troposphere ranges from 2 m at the zenith to 20 m at low elevation angles, depending on pressure, temperature and humidity along the path of the signal transmission.
B. Pace +3 more
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Trend estimation of zenith total delays at IGS stations by using nonparametric methods
Arabian Journal of Geosciences, 2019Global Navigation Satellite System (GNSS) observations play an important role in climate studies because of the advantages they provide. An analysis of the GNSS observations can be used to obtain the zenith total delay (ZTD) parameter, which represents the effect of weather conditions.
Cansu Beşel, Emine Tanır Kayıkçı
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Deep Learning Approaches for Zenith Total Delay Estimation
Zenith Total Delay (ZTD) is a crucial parameter for understanding the effects of atmospheric conditions on satellite signals, constituting a fundamental aspect of precision positioning and atmospheric modeling applications. Traditional methods for ZTD estimation, including GNSS observations, numerical weather prediction models, and interpolation ...Nihal Tekin Ünlütürk, Mehmet Bak
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The Best Number of IGS Stations by Grouping Network for Solving Total Zenith Delay
Advanced Materials Research, 2010Short-term adverse weather conditions have a direct impact on geological disasters. However, the data source of high-precision weather on real time can be provided by GPS technology. At the same time, the high-precision and real-time weather forecast can provide important and basic information for geological disasters monitoring, forecasting and ...
Ying Chun Yue, Zhi Chao Zhang, Pan Xiong
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2020
<p>InSAR derived Atmospheric Phase Screens (APSs) contain the difference between the atmospheric delay along the SAR sensor line-of-sight of two acquisition epochs: the slave and the master epochs. Using estimates of the atmospheric state at the master epoch, coming from independent sources, the APSs can be transformed into maps ...
Stefano Barindelli +9 more
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<p>InSAR derived Atmospheric Phase Screens (APSs) contain the difference between the atmospheric delay along the SAR sensor line-of-sight of two acquisition epochs: the slave and the master epochs. Using estimates of the atmospheric state at the master epoch, coming from independent sources, the APSs can be transformed into maps ...
Stefano Barindelli +9 more
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Progress in 3D-variational assimilation of total zenith delay at the Met Office
Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy, 2001Abstract GPS total zenith delay (TZD) data have been assimilated into local area weather forecasting model using the Met Office's 3D variational assimilation system. The resulting analyses have been used as the initial conditions for a local area forecast model. Comparing model runs with and without GPS data assimilation shows that there is potential
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2020
<p>The motivation of this study is to assess the spatio-temporal patterns in the Zenith Total Delay (ZTD) time series estimated within the second re-processing campaign (1996-2014) of the EUREF Permanent GNSS Network (EPN, http://www.epncb.oma.be) for a set of European stations.
Janusz Bogusz +4 more
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<p>The motivation of this study is to assess the spatio-temporal patterns in the Zenith Total Delay (ZTD) time series estimated within the second re-processing campaign (1996-2014) of the EUREF Permanent GNSS Network (EPN, http://www.epncb.oma.be) for a set of European stations.
Janusz Bogusz +4 more
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Zenith total delay interpolation to support GNSS monitoring of potential precipitations
2017A useful contribution to atmosphere monitoring may be provided by the analysis of GNSS (Global Navigation Satellite System) signals. The authors have identified a procedure to monitor in space and time the Precipitable Water Vapor (PWV) content on regionally extended and orographically complex area.
Ferrando, I., Federici, B., Sguerso, D.
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