Results 61 to 70 of about 200 (130)

Ensemble Based Estimation of Wet Refractivity Indices Using a Functional Model Approach

Earth and Space Science
The estimation of the wet refractivity indices is crucial for applications like weather predictions or improving the accuracy of real‐time positioning techniques.
Masoud Dehvari, Saeed Farzaneh, Ehsan Forootan   +2 more
doaj   +1 more source

Analysis of Spatial and Temporal Characterization of GNSS Tropospheric Parameters During the Extreme Rainfall on ‘9.7’ in Hong Kong

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
On 7 September 2023, Hong Kong experienced a rare extreme rainfall due to the low-pressure trough associated with the remnants of Typhoon “Haikui,” which caused significant casualties and economic losses.
Ming Shangguan, Xiaomei Ren, Shuguang Wu, Huaiqi Ye, Wenkui Li   +4 more
doaj   +1 more source

Analysis of Different Height Correction Models for Tropospheric Delay Grid Products over the Yunnan Mountains

Atmosphere
Accurate tropospheric delays are of great importance for both Global Navigation Satellite System (GNSS)-based positioning and precipitable water vapor monitoring.
Fangrong Zhou, Luohong Li, Yifan Wang, Zelin Dai, Chenchen Ding, Hui Li, Yunbin Yuan   +6 more
doaj   +1 more source

Effect of phase centre variation on tropospheric delay in PPP‐AR with low‐cost global navigation satellite systems receiver and antenna

IET Radar, Sonar & Navigation
As low‐cost global navigation satellite systems receiver and antenna become increasingly prevalent for water vapour monitoring, precise millimetre‐level characterisation of instrument biases is crucial for maintaining measurement accuracy and reliability.
Jizhong Wu, Xiaoying Wang, Hongyang Ma
doaj   +1 more source

A Tropospheric Delay Model for InSAR in Alpine Canyon Regions Through Incorporation of Time-Varying Gaussian Coefficients and Coupled ZWD

Atmosphere
This study addresses the stratified and turbulent tropospheric delays that impede interferometric synthetic aperture radar (InSAR) deformation monitoring in alpine canyon regions.
Jihong Zhang, Xiaoqing Zuo, Shipeng Guo, Cheng Huang, Xuefu Yue   +4 more
doaj   +1 more source

A Global Model for Estimating Tropospheric Delay and Weighted Mean Temperature Developed with Atmospheric Reanalysis Data from 1979 to 2017

Remote Sensing, 2019
Precise modeling of tropospheric delay and weighted mean temperature (Tm) is critical for Global Navigation Satellite System (GNSS) positioning and meteorology.
Zhangyu Sun, Bao Zhang, Yibin Yao
doaj   +1 more source

HASH-Z: A Height-Correction Adjusted Spherical Harmonic Model for Real-Time Tropospheric Delay Correction Over China

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Precise point positioning (PPP) has become a key technique in global navigation satellite systems (GNSS) applications, but its use in real-time is limited by long convergence times.
Hao Chen, Ningbo Wang, Kefei Zhang, Tomasz Hadas, Zishen Li, Hongxing Zhang, Suqin Wu, Longjiang Li, Hang Zhong, Liang Wang   +9 more
doaj   +1 more source

A New Global ZTD Forecast Model Based on Improved LSTM Neural Network

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Zenith tropospheric delay (ZTD), consisting of zenith hydrostatic delay (ZHD) and zenith wet delay (ZWD), is a significant contributor to errors in precise positioning using the global navigation satellite system (GNSS) precise point positioning (PPP ...
Lin He, Yibin Yao, Chaoqian Xu, Zhang Huan, Feifei Tang, Changquan Ji, Zhuoya Liu, Wentan Wu   +7 more
doaj   +1 more source

An Interferometric Synthetic Aperture Radar Tropospheric Delay Correction Method Based on a Global Navigation Satellite System and a Backpropagation Neural Network: More Suitable for Areas with Obvious Terrain Changes. [PDF]

Sensors (Basel), 2023
Qiu L, Chen P, Yao Y, Chen H, Tang F, Xiong M.   +5 more
europepmc   +1 more source

ZWDX: a global zenith wet delay forecasting model using XGBoost

Earth, Planets and Space
Tropospheric delays play a crucial role for Global Navigation Satellite Systems (GNSS). They are a major error source in GNSS positioning and, at the same time, also a variable of interest in GNSS meteorology.
Laura Crocetti, Matthias Schartner, Marcus Franz Wareyka-Glaner, Konrad Schindler, Benedikt Soja   +4 more
doaj   +1 more source