Results 1 to 10 of about 506 (156)

Regional zenith tropospheric delay prediction using DBO-optimized CNN-LSTM with multihead attention [PDF]

Scientific Reports
Zenith Total Delay (ZTD) is integral to applications such as atmospheric water vapor inversion and precise positioning in the Global Navigation Satellite System (GNSS).
Ruixue Yang, Xu Yang, Shicheng Xie, Xuexiang Yu   +3 more
doaj   +2 more sources

TransXLT: A novel ZTD prediction method with SASR-based data reconstruction. [PDF]

iScience
Traditional Zenith Tropospheric Delay (ZTD) models often face difficulties in maintaining prediction accuracy under complex meteorological conditions and data loss. To address this, we propose the transformer-xLSTM (TransXLT) model, which integrates spatial-temporal information from global navigation satellite system (GNSS) stations, ERA5 (global ...
Shicheng Xie, Yu X, Yuan J, Yang X, Zhu M, Han Y, Wei M, Guo Z.   +7 more
europepmc   +4 more sources

A Regional Zenith Tropospheric Delay (ZTD) Model Based on GPT3 and ANN [PDF]

Remote Sensing, 2021
The delays of radio signals transmitted by global navigation satellite system (GNSS) satellites and induced by neutral atmosphere, which are usually represented by zenith tropospheric delay (ZTD), are required as critical information both for GNSS ...
Fei Yang, Jiming Guo, Chaoyang Zhang, Yitao Li, Jun Li   +4 more
doaj   +2 more sources

High-Precision ZTD Model of Altitude-Related Correction

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023
Zenith tropospheric delay (ZTD) is one of the main error sources in space geodesy. The existing regional or global models, such as Global Pressure and Temperature 3 (GPT3), Global Tropospheric model, Global Hopfield, and Shanghai Astronomical observatory
Qingzhi Zhao, Jing Su, Chaoqian Xu, Yibin Yao, Xiaoya Zhang, Jifeng Wu   +5 more
doaj   +2 more sources

Assessment of ZTD Derived from COSMIC Occultation Data with ECWMF, Radiosondes, and GNSS. [PDF]

Sensors (Basel), 2022
Global Navigation Satellite System (GNSS) signals generate slant tropospheric delays when they pass through the atmosphere, which is recognized as the main source of error in many spatial geodetic applications. The zenith tropospheric delay (ZTD) derived from radio occultation data is of great significance to atmospheric research and meteorology and ...
Fu N, Jiang M, Li F, Guo P, Hou C, Wu M, Wu J, Wang Z, Kan L.   +8 more
europepmc   +4 more sources

Evaluation of the ZWD/ZTD Values Derived from MERRA-2 Global Reanalysis Products Using GNSS Observations and Radiosonde Data [PDF]

Sensors, 2020
Tropospheric delay is one of the main errors affecting high-precision positioning and navigation and is a key parameter of water vapor detection in the Global Navigation Satellite System (GNSS).
Liangke Huang, Lijie Guo, Lilong Liu, Hua Chen, Jun Chen, Shaofeng Xie   +5 more
doaj   +2 more sources

Real-time retrieval of high-precision ZTD maps using GNSS observation

Geodesy and Geodynamics
Zenith Tropospheric Delay (ZTD) is an important factor that restricts the high-precision positioning of global navigation satellite system (GNSS), and it is of great significance in establishing a real-time and high-precision ZTD model. However, existing
Qingzhi Zhao, Wei Wang, Jinfang Yin, Kan Wu, Lv Zhou, Yibin Yao, Pengcheng Wang, Jing Su, Xiaocheng Wang, Han Wang, Jia Bao, Yumeng Hu, Zhou Zhuo, Yuting Gao   +13 more
doaj   +2 more sources

Modeling and Forecasting the GPS Zenith Troposphere Delay in West Antarctica Based on Different Blind Source Separation Methods and Deep Learning [PDF]

Sensors, 2020
Tropospheric delay is an important error source in global positioning systems (GPS), and the water vapor retrieved from the tropospheric delay is widely used in meteorological research such as climate analysis and weather forecasting.
Qingchuan Zhang, Fei Li, Shengkai Zhang, Wenhao Li   +3 more
doaj   +2 more sources

Preliminary Results on Tropospheric ZTD Estimation by Smartphone [PDF]

Remote Sensing, 2021
The Global Navigation Satellite System (GNSS) receiver is one of the many sensors embedded in smartphones. The early versions of the Android operating system could only access limited information from the GNSS, allowing the related Application Program Interface (API) to obtain only the location.
Lorenzo Benvenuto, Paolo Dabove, Ilaria Ferrando, Domenico Sguerso   +3 more
openaire   +2 more sources

Regional Zenith Tropospheric Delay Modeling Based on Least Squares Support Vector Machine Using GNSS and ERA5 Data

Remote Sensing, 2021
The meteorological reanalysis data has been widely applied to derive zenith tropospheric delay (ZTD) with a high spatial and temporal resolution. With the rapid development of artificial intelligence, machine learning also begins as a high-efficiency ...
Song Li, Tianhe Xu, Nan Jiang, Honglei Yang, Shuaimin Wang, Zhen Zhang   +5 more
doaj   +1 more source