Results 151 to 160 of about 2,145,064 (260)

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

Zenith Tropospheric Delay Forecasting in the European Region Using the Informer–Long Short-Term Memory Networks Hybrid Prediction Model

Atmosphere
Zenith tropospheric delay (ZTD) is a significant atmospheric error that impacts the Global Navigation Satellite System (GNSS). Developing a high-precision, long-term forecasting model for ZTD can provide valuable insights into the overall trends of ...
Zhengdao Yuan, Xu Lin, Yashi Xu, Jie Zhao, Nage Du, Xiaolong Cai, Mengkui Li   +6 more
doaj   +1 more source

Microwave radiometry as a tool to calibrate tropospheric water-vapor delay [PDF]

Microwave radiometers were used to measure the emission line due to the water vapor molecules of atmospheric emission. Four separate field tests were completed which compared radiometers to other techniques which measure water vapor.
Claflin, E. S., Resch, G. M.
core   +1 more source

Empirical Modeling of Tropospheric Delays and Uncertainty

Abstract. Accurate modeling of troposphere delay is important for high-precision data analysis of space geodetic techniques, such as the Global Navigation Satellite System (GNSS). The empirical troposphere delay models provide zenith delays with an accuracy of 3 to 4 cm globally and do not rely on external meteorological input.
Jungang Wang, Junping Chen, Yize Zhang
openaire   +2 more sources

Error estimation for ORION baseline vector determination [PDF]

Effects of error sources on Operational Radio Interferometry Observing Network (ORION) baseline vector determination are studied. Partial derivatives of delay observations with respect to each error source are formulated. Covariance analysis is performed
Wu, S. C.
core   +1 more source

Simulation and analysis of differential global positioning system for civil helicopter operations [PDF]

A Differential Global Positioning System (DGPS) computer simulation was developed, to provide a versatile tool for assessing DGPS referenced civil helicopter navigation.
Cabak, A. R., Denaro, R. P.
core   +1 more source

Determination of GPS orbits to submeter accuracy [PDF]

Orbits for satellites of the Global Positioning System (GPS) were determined with submeter accuracy. Tests used to assess orbital accuracy include orbit comparisons from independent data sets, orbit prediction, ground baseline determination, and formal ...
Bertiger, W. I., Katsigris, E. C., Lichten, S. M.   +2 more
core   +1 more source

Wet Refractivity tomographic reconstruction over small areas using an ad-hoc GPS receivers network [PDF]

, 2011
One of the most attractive scientific issues in the use of GNSS (Global Navigation Satellite System) signal from a meteorological point of view, is the retrieval of high resolution tropospheric water vapour maps.
Cucca, Manuela, Notarpietro, Riccardo, Venuti, G.   +2 more
core  

A demonstration of high precision GPS orbit determination for geodetic applications [PDF]

High precision orbit determination of Global Positioning System (GPS) satellites is a key requirement for GPS-based precise geodetic measurements and precise low-earth orbiter tracking, currently under study at JPL.
Border, J. S., Lichten, S. M.
core   +1 more source

Real-time tropospheric delay retrieval with GPS, GLONASS, Galileo and BDS data. [PDF]

Sci Rep, 2018
Pan L, Guo F.
europepmc   +1 more source