Results 21 to 30 of about 329 (133)

A new zenith hydrostatic delay model for real-time retrievals of GNSS-PWV [PDF]

Atmospheric Measurement Techniques, 2021
The quality of the zenith hydrostatic delay (ZHD) could significantly affect the accuracy of the zenith wet delay (ZWD) of the Global Navigation Satellite System (GNSS) signal, and from the ZWD precipitable water vapor (PWV) can be obtained.
L. Li, L. Li, S. Wu, S. Wu, K. Zhang, K. Zhang, K. Zhang, X. Wang, W. Li, W. Li, Z. Shen, Z. Shen, D. Zhu, D. Zhu, Q. He, Q. He, M. Wan, M. Wan   +17 more
doaj   +1 more source

Development of a New Tabular Zenith Tropospheric Delay Model for Real-Time GNSS Applications

IEEE Access, 2021
The tropospheric delay is a major error source for Global Navigation Satellite System (GNSS) positioning and navigation, and usually can be corrected by using an empirical model.
Jian Mao, Junyang Han, Tiejun Cui
doaj   +1 more source

Assessment of GNSS zenith tropospheric delay responses to atmospheric variables derived from ERA5 data over Nigeria

Satellite Navigation, 2023
Tropospheric delay is a major error caused by atmospheric refraction in Global Navigation Satellite System (GNSS) positioning. The study evaluates the potential of the European Centre for Medium-range Weather Forecast (ECMWF) Reanalysis 5 (ERA5 ...
Ifechukwu Ugochukwu Nzelibe, Herbert Tata, Timothy Oluwadare Idowu   +2 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

Machine Learning-Based Calibrated Model for Forecast Vienna Mapping Function 3 Zenith Wet Delay

Remote Sensing, 2023
An accurate estimation of zenith wet delay (ZWD) is crucial for global navigation satellite system (GNSS) positioning and GNSS-based precipitable water vapor (PWV) inversion. The forecast Vienna Mapping Function 3 (VMF3-FC) is a forecast product provided
Feijuan Li, Junyu Li, Lilong Liu, Liangke Huang, Lv Zhou, Hongchang He   +5 more
doaj   +1 more source

A hybrid-grid global model for the estimation of atmospheric weighted mean temperature considering time-varying vertical adjustment rate in GNSS precipitable water vapour retrieval [PDF]

Geoscientific Model Development
The atmospheric weighted mean temperature (Tm) is a key parameter in global navigation satellite system (GNSS) water vapour retrieval and can convert the zenith wet delay (ZWD) into precipitable water vapour (PWV). However, there are some shortcomings in
S. Xie, J. Zhang, L. Huang, F. Chen, Y. Wu, Y. Wang, L. Liu   +6 more
doaj   +1 more source

A global grid model for the estimation of zenith tropospheric delay considering the variations at different altitudes [PDF]

Geoscientific Model Development, 2023
The accuracy of tropospheric delay correction heavily depends on the quality of the tropospheric model, and the zenith tropospheric delay (ZTD) is an important factor affecting the tropospheric delay. Therefore, it is essential to establish a precise ZTD
L. Huang, L. Huang, S. Lan, S. Lan, G. Zhu, F. Chen, F. Chen, J. Li, J. Li, L. Liu, L. Liu   +10 more
doaj   +1 more source

The GNSS PWV retrieval using non-observation meteorological parameters based on ERA5 and its relation with precipitation

Geodesy and Geodynamics
The pressure and temperature significantly influence precipitable water vapor (PWV) retrieval. Global Navigation Satellite System (GNSS) PWV retrieval is limited because the GNSS stations lack meteorological sensors.
Weifeng Yang, Zhiping Chen, Kaiyun Lv, Pengfei Xia, Tieding Lu   +4 more
doaj   +1 more source

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   +1 more source

The effect of data sources on calculating mean temperature and integrated water vapor in Iran

Meteorological Applications, 2023
The weighted mean temperature (Tm) plays a crucial role in calculating Precipitable Water Vapor (PWV) and integrated water vapor (IWV) using Global Navigation Satellite Systems (GNSS) techniques.
Hassan Rahimi, Jamal Asgari, Vahab Nafisi   +2 more
doaj   +1 more source