Results 181 to 190 of about 2,142 (216)

A global grid model for the correction of the vertical zenith total delay based on a sliding window algorithm

GPS Solutions, 2021
Reanalysis products have been applied to calculate the tropospheric delay for Global Navigation Satellite System (GNSS) positioning purposes widely. It is necessary to obtain high-precision tropospheric delay information from GNSS users with a high-precision tropospheric vertical stratification model because the height of the grids of the atmospheric ...
Liangke Huang, Ge Zhu, Lilong Liu, Hua Chen, Weiping Jiang   +4 more
openaire   +1 more source

Results of a GPS Zenith Total Delay data assimilation experiment over Italy

2023
The 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, Rosa Claudia Torcasio, Eugenio Realini, Giulio Tagliaferro, Stefano Dietrich   +4 more
openaire   +1 more source

Variability and accuracy of Zenith Total Delay over the East African tropical region

Advances in Space Research, 2019
The 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), Oruru, Bosco (author), D'ujanga, Florence Mutonyi (author), Realini, Eugenio (author), Barindelli, Stefano (author), Tagliaferro, Giulio (author), van de Giesen, N.C. (author)   +6 more
openaire   +3 more sources

Trend estimation of zenith total delays at IGS stations by using nonparametric methods

Arabian Journal of Geosciences, 2019
Global 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
openaire   +1 more source

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, 2001
Abstract 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
openaire   +1 more source

From InSAR derived relative tropospheric Slant Total Delay maps to absolute Zenith Total Delay maps: comparisons between tropospheric delay products to define a strategy for meteorological applications.

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, Andrea Gatti, Martina Lagasio, Marco Manzoni, Alessandra Mascitelli, Andrea Monti Guarnieri, Marco Montrasio, Eugenio Realini, Giulio Tagliaferro, Giovanna Venuti   +9 more
openaire   +2 more sources

Computation of Zenith Total Delay Correction Fields Using Ground-Based GNSS

2015
Tropospheric 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, R. Pacione, C. Sciarretta, G. Bianco   +3 more
openaire   +1 more source

Analysis and Estimation of Zenith Wet Delay and Zenith Tropospheric Total Delay at Earth’s different Geographical Areas

2021 Seventh International Conference on Aerospace Science and Engineering (ICASE), 2021
openaire   +1 more source

Investigation on the Relation between Zenith Total Delay and Atmospheric Particulate Matter (PM2.5)

2021 IEEE USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), 2021
Shilpa Manandhar, Yu Song Meng, Yee Hui Lee   +2 more
openaire   +1 more source

Transformer-Based Global Zenith Tropospheric Delay Forecasting Model

Remote Sensing, 2022
Huan Zhang, Yibin Yao, Chaoqian Xu
exaly