Results 51 to 60 of about 1,086,410 (154)

Tropospheric delay performance for GNSS integrated water vapor estimation by using GPT2w model, ECMWF's IFS operational model and in situ meteorological data [PDF]

Advances in Geosciences, 2018
Tropospheric delay comprises one of the most important error sources in satellite navigation and is caused when radio signals broadcasted by GPS satellites propagate into the atmosphere.
C. Oikonomou, F. Tymvios, F. Tymvios, C. Pikridas, S. Bitharis, K. Balidakis, S. Michaelides, H. Haralambous, H. Haralambous, D. Charalambous, D. Charalambous   +10 more
doaj   +1 more source

Weighted Mean Temperature Hybrid Models in China Based on Artificial Neural Network Methods

Remote Sensing, 2022
The weighted mean temperature (Tm) is crucial for converting zenith wet delay to precipitable water vapor in global navigation satellite system meteorology.
Meng Cai, Junyu Li, Lilong Liu, Liangke Huang, Lv Zhou, Ling Huang, Hongchang He   +6 more
doaj   +1 more source

Three‐Year Characterization of Boundary Layer Dynamics From GNSS Zenith Wet Delay Spectral Analysis

Atmospheric Science Letters, Volume 27, Issue 6, June 2026.
Three years of GNSS zenith wet delay observations at Payerne reveal that spectral parameters—cutoff frequency α and variance σ2—capture robust seasonal cycles in boundary layer turbulence (R2 = 0.54 for α). Their inverse coupling tightens to r = −0.82 under summer convection, encoding regime‐dependent physics.
Gaël Kermarrec, Xavier Calbet, Zhiguo Deng   +2 more
wiley   +1 more source

Impact of stochastic modelling on GPS height and zenith wet delay estimation [PDF]

, 2009
Most stochastic modelling techniques assume the physical correlations among the raw observations to be negligible when forming the variance covariance matrix of the GPS observations. Such an assumption may, however, lead to significantly biased solutions.
Featherstone, Will, Lo, Johnny, Penna, N., El-Mowafy, Ahmed   +3 more
core   +1 more source

GRENet: GNSS‐Enhanced Radar Extrapolation Network for Precipitation Nowcasting

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract Accurate precipitation nowcasting is one of the most challenging tasks in atmospheric sciences. The current methods of nowcasting primarily rely on inferring precipitation from radar reflectivity, which inevitably leads to uncertainties in forecasts due to the limitations of single radar data in capturing the detailed initial conditions of ...
Cuixian Lu, Quanfei Wang, Yuxin Zheng, Xiaohong Zhang, Jiafeng Li, Xuanzhen Zhang, Galina Dick, Jonathan Jones   +7 more
wiley   +1 more source

Analysis of Crustal Deformation Due to Ocean Tide Loading [PDF]

Journal of Astronomy and Space Sciences, 2007
The crustal deformation due to Ocean Tide Loading (OTL) in the Korean peninsula reaches up to ˜3 cm in the vertical direction. Considering that the achievable positioning accuracy of current state-of-the-art space geodesy technologies is at the several ...
Kwan-Dong Park, Jihye Won, Ho-Kyun Kim, Kwan-Chang Lim   +3 more
doaj   +1 more source

A Window‐Augmented Machine Learning Approach for Direct GNSS Precipitable Water Vapor Retrieval

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 2, April 2026.
Abstract Global Navigation Satellite Systems (GNSS) provide an effective means for remote sensing of precipitable water vapor (PWV). However, conventional GNSS‐based PWV retrieval approaches rely heavily on auxiliary meteorological parameters, which are frequently unavailable in real time, while most direct retrieval methods use station data aggregated
Zhouao Zheng, Haoyu Wang, Liangke Huang, Ziwei Li, Haojun Li, Hongxing Zhang, Junyu Li, Lilong Liu   +7 more
wiley   +1 more source

TOMO4D Operator for Assimilation of GNSS Tomography‐Derived Water Vapor Fields Into the WRFDA 4DVAR System to Improve Regional Rainfall Forecasting

Journal of Advances in Modeling Earth Systems, Volume 18, Issue 4, April 2026.
Abstract Accurate representation of atmospheric water vapor is crucial for improving numerical weather prediction, particularly over regions with complex topography and sparse observation networks. Although assimilation of Global Navigation Satellite System (GNSS)‐derived integrated products such as zenith total delay or precipitable water vapor can ...
Arash Tayfehrostami, Yazdan Amerian, Saeed Izanlou, Majid Azadi   +3 more
wiley   +1 more source

Dynamic Modelling of Zenith Wet Delay in GNSS Measurements [PDF]

, 2011
Proper modelling of the temporal correlations of the zenith wet delay (ZWD) is important in some of the Global Navigation Satellite Systems (GNSS) applications such as estimation of the Perceptible Water Vapour (PWV), and methods such as Precise Point ...
Hu, Congwei, Lo, Johnny, El-Mowafy, Ahmed   +2 more
core  

A High-Accuracy GNSS Tropospheric Wet Delay Forecasting Algorithm via PINN-LSTM Integration Tailored to Complex Mountainous Terrain and Urban Environments: Methodology and Validation

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
The rapid expansion of low-altitude uncrewed aerial system (UAS) operations in complex mountainous urban environments have created urgent demand for high spatiotemporal resolution water vapor observations to support safe flight, precise navigation, and ...
Huan Zhang, Guihua Zhang, Bao Zhang, Mengzhu Peng, Zhizhong Wang, Jin Ma, Chaoqian Xu, Yibin Yao   +7 more
doaj   +1 more source