Results 21 to 30 of about 246 (139)

A Regional Model for Predicting Tropospheric Delay and Weighted Mean Temperature in China Based on GRAPES_MESO Forecasting Products

Remote Sensing, 2021
Accurate tropospheric delay (TD) and weighted mean temperature (Tm) are important for Global Navigation Satellite System (GNSS) positioning and GNSS meteorology.
Liying Cao, Bao Zhang, Junyu Li, Yibin Yao, Lilong Liu, Qishun Ran, Zhaohui Xiong   +6 more
doaj   +1 more source

Empirical model for mean temperature and assessment of precipitable water vapor derived from GPS

Geodesy and Geodynamics, 2013
The estimation of Precipitable Water Vapor (PWV) derived from Global Positioning System (GPS) data at the IGS site WUHN is assessed by comparing with PWV obtained from radiosonde data (No.57494) in Wuhan.
Tang Yanxin, Liu Lilong, Yao Chaolong
doaj   +1 more source

Retrieving Precipitable Water Vapor from Real-Time Precise Point Positioning Using VMF1/VMF3 Forecasting Products

Remote Sensing, 2021
Real-time precise point positioning (RT-PPP) has become a powerful technique for the determination of the zenith tropospheric delay (ZTD) over a GPS (global positioning system) or GNSS (global navigation satellite systems) station of interest, and the ...
Peng Sun, Kefei Zhang, Suqin Wu, Moufeng Wan, Yun Lin   +4 more
doaj   +1 more source

Challenges and Strategies in Managing Pulmonary Arterial Hypertension Within the Indian Healthcare System: A Consensus Statement From the Pulmonary Vascular Research Institute India Taskforce. [PDF]

Pulm Circ
ABSTRACT Pulmonary arterial hypertension (PAH) in India is a substantial yet under‐recognized contributor to cardiovascular morbidity and mortality. Its progressive course, nonspecific early manifestations, and heterogeneous aetiologies often lead to delayed diagnosis and fragmented care.
Bobhate P, Awasthy N, Babu AS, Giri S, Gopalakrishnan A, Harikrishnan S, Karandikar N, Khan BJ, Kulkarni S, Kumar S, Mehrotra R, Mohanty S, Ramakrishnan S, Saxena A, Shenoy P, Srinivasa Sastry BK, Sunder T.   +16 more
europepmc   +2 more sources

Precipitable Water Vapour Estimation from GNSS Observations: Methodology and Evaluation during a High-Precipitation Month in Santa Maria (RS) [PDF]

ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Precipitable Water Vapour (PWV) represents the total amount of water vapour contained in a vertical column of the atmosphere that is available for precipitation.
A. M. Albuquerque, T. A. F. Gouveia, D. B. M. Alves   +2 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

Tropospheric Second-Order Horizontal Gradient Modeling for GNSS PPP

Remote Sensing, 2022
The asymmetric delay has a considerable impact on Global Navigation Satellite Systems (GNSS) Positioning, Navigation and Timing (PNT) applications. In GNSS analyses, the impacts of the asymmetric delay are commonly compensated by using the classical ...
Yaozong Zhou, Yidong Lou, Weixing Zhang, Peida Wu, Jingna Bai, Zhenyi Zhang   +5 more
doaj   +1 more source

Optimization of GPS water vapor tomography technique with radiosonde and COSMIC historical data [PDF]

Annales Geophysicae, 2016
The near-real-time high spatial resolution of atmospheric water vapor distribution is vital in numerical weather prediction. GPS tomography technique has been proved effectively for three-dimensional water vapor reconstruction.
S. Ye, P. Xia, C. Cai
doaj   +1 more source

Refinement of global gridded ray-traced Zenith tropospheric delay over Nigeria based on local GNSS network observations

Geosystems and Geoenvironment, 2023
Recent studies on the application of Zenith Tropospheric Delay (ZTD) in meteorology and geodesy have shown improved accuracy with the use of locally estimated ZTD compared to Global ZTD.
Ifechukwu Ugochukwu Nzelibe, Timothy Oluwadare Idowu   +1 more
doaj   +1 more source

An ERA5‐Based Model for Estimating Tropospheric Delay and Weighted Mean Temperature Over China With Improved Spatiotemporal Resolutions

Earth and Space Science, 2019
Tropospheric delay is an important error source in Global Navigation Satellite System (GNSS) positioning and can also be used in water vapor monitoring.
Zhangyu Sun, Bao Zhang, Yibin Yao
doaj   +1 more source