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 ...
Richard Cliffe Ssenyunzi +6 more
semanticscholar +6 more sources
Zenith total delay study of a mesoscale convective system : GPS observations and fine-scale modelling [PDF]
Tellus A: Dynamic Meteorology and Oceanography, 2009 Zenith Total Delay (ZTD) observations and model calculations are used to analyze a mesoscale convective system which yielded a large amount of precipitation over a short period of time in the north-western Mediterranean. ZTD observations are derived from
Cucurull, I. +2 more
core +17 more sources
Impact of a priori zenith hydrostatic delay errors on GPS estimates of station heights and zenith total delays [PDF]
Geophysical Research Letters, 2006 Corrections to zenith atmospheric delays (including hydrostatic components) are estimated in geodetic analyses using partial derivatives that relate wet delays to the phase observations. At low‐elevation angles, partial derivatives of the hydrostatic and wet delays are sufficiently different as to cause errors in the estimates of station heights and ...
Tregoning, Paul, Herring, T A
openaire +4 more sources
Anomalous Zenith Total Delays for an Insular Tropical Location: The Tahiti Island Case
Remote Sensing, 2022 The weighted mean temperature of the troposphere, Tm, is a key parameter in GNSS meteorology. It can be routinely derived based on meteorological data from radiosonde (RS) or numerical weather models. Alternatively, it can be also derived through a least-
Fangzhao Zhang +3 more
doaj +2 more sources
Comparative analysis of real-time precise point positioning zenith total delay estimates [PDF]
GPS Solutions, 2016 The continuous evolution of global navigation satellite systems (GNSS) meteorology has led to an increased use of associated observations for operational modern low-latency numerical weather prediction (NWP) models, which assimilate GNSS-derived zenith ...
F. Ahmed +5 more
semanticscholar +4 more sources
Remote Sensing of Environment, 2020 Sentinel-1 mission with its wide spatial coverage (250 km), short revisit time (6 days), and rapid data dissemination opened new perspectives for large-scale interferometric synthetic aperture radar (InSAR) analysis.
R. Shamshiri +4 more
semanticscholar +3 more sources
Noise characteristics in Zenith Total Delay from homogeneously reprocessed GPS time series [PDF]
, 2016 . Zenith Total Delay (ZTD) time series, derived from the re-processing of Global Positioning System (GPS) data, provide valuable information for the evaluation of global atmospheric reanalysis products such as ERA-Interim.
A. Klos +5 more
semanticscholar +4 more sources
Zenith total delay short-term statistical forecasts for GNSS Precise Point Positioning [PDF]
Acta Geodynamica et Geomaterialia, 2015 Troposphere delay values may be applied either in positioning or meteorology. Several troposphere delay empirical models are available as functions of meteorological parameters (temperature, air pressure and relative humidity); the zenith total delay ...
K. Wilgan
semanticscholar +2 more sources
Precipitable Water Vapour and Zenith Total Delay time series and models over Slovakia and vicinity
Contributions to Geophysics and Geodesy, 2010 More than 50 permanent GNSS (Global Navigation Satellite Systems) stations are processed continually within the Central European Permanent Network. Zenith Total Delay (ZTD), one of the processing outputs, reflects a delay of the GNSS signal caused by ...
Miroslava IGONDOVÁ, Dušan CIBULKA
doaj +2 more sources
Assimilation of ground-based GNSS data using a local ensemble Kalman filter [PDF]
Scientific ReportsTropical cyclones become increasingly nonlinear and dynamically unstable in high-resolution models. The initial conditions are typically sub-optimal, leaving scope to improve the accuracy of forecasts with improved data assimilation.
Changliang Shao, Lars Nerger
doaj +2 more sources