Results 71 to 80 of about 1,220 (193)

GNSS Real-Time ZTD/PWV Retrieval Based on PPP with Broadcast Ephemerides

GNSS precise point positioning (PPP) plays an important role in retrieving atmospheric water vapor values and performing numerical weather prediction. However, traditional PPP relies on real-time orbits and clocks, which require continuous internet or ...
Gen Zhang, Yantian Xu, Nannan Yang, Shuhao Liu, Zongqiu Xu, Longjiang Tang   +5 more
core   +2 more sources

Regional Tropospheric Delay Prediction Model Based on LSTM-Enhanced Encoder Network

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Precise modeling of zenith tropospheric delay (ZTD) is essential for real-time high-precision positioning in global navigation satellite systems. Due to the stochastic variability of atmospheric water vapor across different regions, tropospheric delay ...
Yuanfang Peng, Chenglin Cai, Zexian Li, Kaihui Lv, Xue Zhang, Yihao Cai   +5 more
doaj   +1 more source

Analisis nilai Zenith Tropospheric Delay (ZTD) menggunakan Data CORS di wilayah Jawa Timur tahun 2015-2018 [PDF]

, 2020
Global Navigation Satellite System (GNSS) kini dikembangkan sebagai sistem penginderaan jauh atmosfer melalui perhitungan Zenith Tropospheric Delay (ZTD). Salah satu komponen dalam ZTD adalah Zenith Wet Delay (ZWD). ZWD dipengaruhi oleh kandungan uap air
Mannani, Norma Aji Cemara
core  

Research on Applicability of GNSS PWV Data in Northeast China and Its Application in Intelligent Precipitation Prediction

Earth and Space Science, Volume 12, Issue 10, October 2025.
Abstract Atmospheric water vapor is an important factor in the formation and evolution of extreme weather events, such as heavy rainfall, typhoons, and major droughts and floods. We analyzed the applicability of precipitable water vapor (PWV) values from the Global Navigation Satellite System Meteorology (GNSS/MET) stations in northeastern China.
Yang Liu, Gen Wang, Tiening Zhang, Ping Wang, Bing Xu, Jinyi Xia   +5 more
wiley   +1 more source

Aportes al análisis y cálculo del ZTD en base a redes geodésicas y modelos atmosféricos: Assessment of ZTD derived from geodetic networks and atmospheric models

, 2023
Cuando la señal GNSS atraviesa masas de vapor de agua (WV), la velocidad de propagación disminuye generando un retardo en el camino que recorre el pulso.
Rosell, Patricia Alejandra, Mackern, María Virginia, Euillades, Pablo   +2 more
core  

The VMD-Informer-BiLSTM-EAA Hybrid Model for Predicting Zenith Tropospheric Delay

Remote Sensing
Zenith Tropospheric Delay (ZTD) is a significant source of atmospheric error in the Global Navigation Satellite System (GNSS). Developing a high-accuracy ZTD prediction model is essential for both GNSS positioning and GNSS meteorology.
Zhengdao Yuan, Xu Lin, Yashi Xu, Ruiting Dai, Cong Yang, Lunwei Zhao, Yakun Han   +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  

A New Zenith Tropospheric Delay Grid Product for Real-Time PPP Applications over China

Sensors, 2017
Tropospheric delay is one of the major factors affecting the accuracy of electromagnetic distance measurements. To provide wide-area real-time high precision zenith tropospheric delay (ZTD), the temporal and spatial variations of ZTD with altitude were ...
Yidong Lou, Jinfang Huang, Weixing Zhang, Hong Liang, Fu Zheng, Jingnan Liu   +5 more
doaj   +1 more source

The ztd estimated values from three models named Site-wise, Grid-wise, and GPT3 and the ztd reference values provided by IGS between 2016 and 2020.

<p>The data includes the zenith total delay (ztd) values computed by three models provided by the VMF data server, namely <strong>Site-wise, Grid-wise, and GPT3</strong>, for target stations during the period from 2016 to 2020, along ...
Yao
core   +1 more source

Active Diffusion Controlled Dual Stability in Thermoelectrics for Sustainable Heat Harvesting

Advanced Materials, Volume 37, Issue 38, September 25, 2025.
Introducing a Mg interlayer at the junction simultaneously stabilizes Mg3(Bi,Sb)2 materials and contacts for over 100 days. This dual stabilization derives from suppressing detrimental Mg diffusion and compensating for Mg loss, thereby maintaining an outstanding power density of 0.45 W cm−2 and remarkable conversion efficiency of 8.6% in aged modules ...
Longquan Wang, Airan Li, Xinzhi Wu, Jiankang Li, Takeo Ohsawa, Takao Mori   +5 more
wiley   +1 more source