Results 111 to 120 of about 223,361 (218)

Estimating the Impact of Global Navigation Satellite System Horizontal Delay Gradients in Variational Data Assimilation

Remote Sensing, 2018
We developed operators to assimilate Global Navigation Satellite System (GNSS) Zenith Total Delays (ZTDs) and horizontal delay gradients into a numerical weather model. In this study we experiment with refractivity fields derived from the Global Forecast
Florian Zus, Jan Douša, Michal Kačmařík, Pavel Václavovic, Galina Dick, Jens Wickert   +5 more
doaj   +1 more source

Tropospheric refraction and its influence through Zenith Total Path Delay at different IGS stations

, 2023
Edited by Aleksandra Nina, Snežana Dragović, and Dejan ...
Vasilić, Violeta, Brajović, Ljiljana, Petković, Dušan, Blagojević, Dragan   +3 more
openaire   +1 more source

Early science with Korean VLBI network: the QCAL-1 43GHz calibrator survey

, 2012
This paper presents the catalog of correlated flux densities in three ranges of baseline projection lengths of 637 sources from a 43 GHz (Q-band) survey observed with the Korean VLBI Network.
Byun, Do-Young, Chung, Hyunsoo, Chung, Moon-Hee, Han, Seog-Tae, Je, Do-Heung, Jung, Taehyun, Kang, Jiman, Kim, Bong Gyu, Kim, Hyun-Goo, Kim, Jongsoo, Lee, Jung-Won, Lee, Sang-Sung, Oh, Junghwan, Petrov, Leonid, Sohn, Bong Won, Song, Min-Gyu, Wi, Seog-Oh   +16 more
core   +1 more source

Mitigation of tropospheric delay induced errors in TS-InSAR ground deformation monitoring

International Journal of Digital Earth
Interferometric Synthetic Aperture Radar (InSAR) is capable of detecting crust deformation. However, the accuracy is limited by spatiotemporal changes in the lower troposphere.
Shipeng Guo, Xiaoqing Zuo, Wenhao Wu, Xu Yang, Jihong Zhang, Yongfa Li, Cheng Huang, Jingwei Bu, Shasha Zhu   +8 more
doaj   +1 more source

An Evaluation of the Accuracy of Real-Time Zenith Total Delay Estimates

, 2013
The continuous evolution of Global Navigation Satellite Systems (GNSS) meteorology has lead to an increased use of associated observations for operational meteorology worldwide. In order to enhance short-term weather forecasts meteorological institutions use modern low-latency Numerical Weather Prediction (NWP) models which assimilate GNSS-derived ...
Ahmed, Furqan, Teferle, Felix Norman, Bingley, Richard, Laurichesse, Denis   +3 more
openaire   +1 more source

Assessment of the PPP-AR Strategy for ZTD and IWV in Africa: A One-Year GNSS Study

Atmosphere
With the increasing demand for near real-time atmospheric water vapor monitoring, this study evaluates the performance of the open-source PRIDE PPP-AR software (version 3.0.5) for retrieving Zenith Total Delay (ZTD) and Integrated Water Vapor (IWV) over ...
Moustapha Gning Tine, Pierre Bosser, Ngor Faye, Lila Jean-Louis, Mapathé Ndiaye   +4 more
doaj   +1 more source

The effect of the dynamic wet troposphere on VLBI measurements [PDF]

Calculations using a statistical model of water vapor fluctuations yield the effect of the dynamic wet troposphere on Very Long Baseline Interferometry (VLBI) measurements.
Lanyi, G. E., Treuhaft, R. N.
core   +1 more source

GAM-STTD: a spatiotemporal tropospheric delay correction model for time-series InSAR in complex mountainous regions

International Journal of Digital Earth
Tropospheric delay remains a critical error source in time-series interferometric synthetic aperture radar (TS-InSAR), particularly in mountainous and plateau regions where seasonal stratification and stochastic turbulence coexist.
Shipeng Guo, Xiaoqing Zuo, Jihong Zhang, Xu Yang   +3 more
doaj   +1 more source

Assessment of BDS-3 PPP-B2b Service and Its Applications for the Determination of Precipitable Water Vapour

Atmosphere
The precise point positioning (PPP) service via the B2b signal (PPP-B2b) on the BeiDou Navigation Satellite System (BDS) provides high-accuracy orbit and clock data for global navigation satellite systems (GNSSs), enabling real-time atmospheric data ...
Xiaoming Wang, Yufei Chen, Jinglei Zhang, Cong Qiu, Kai Zhou, Haobo Li, Qiuying Huang   +6 more
doaj   +1 more source

Mesoscale GPS Zenith Delay assimilation during a Mediterranean heavy precipitation event [PDF]

Advances in Geosciences, 2008
The impact of assimilating Zenith Total delay (ZTD) observations from a mesoscale ground-based GPS network over Western Europe is evaluated for the heavy precipitation event of 5–9 September 2005 over Southern France.
X. Yan, V. Ducrocq, P. Poli, G. Jaubert, A. Walpersdorf   +4 more
doaj