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Continuous High-Precision Positioning in Smartphones by FGO-Based Fusion of GNSS-PPK and PDR. [PDF]
Micromachines (Basel)Magsi AH, Díez LE, Knauth S.
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Study on Optimization Method for InSAR Baseline Considering Changes in Vegetation Coverage. [PDF]
Sensors (Basel)Guo J +8 more
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Establishment and assessment of a zenith wet delay (ZWD) augmentation model
GPS Solutions, 2021The zenith wet delay (ZWD) accuracy is one of the most important factors affecting the convergence time and the positioning precision in precise point positioning processing. Taking into account the limitation of the empirical and blind ZWD models, the correlations between the ZWD and temperature and water vapor pressure at each point of the global 1o ×
Fei Yang +5 more
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Zenith Wet Delay Estimation and Radio Source Sky Coverage
Advanced Materials Research, 2013This paper investigates some approaches to improve the accuracy of parameter estimation in geodetic Very Long Baseline Interferometry (VLBI). By analyzing the radio source Sky Coverage (SC) for each antenna, a new approach, the method of condition number is proposed to find out reasonable time ranges for zenith wet delay (ZWD) estimation.
Zhi Bin Zhang, Xiang Liu, Jin Ning Gao
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GPS Meteorology: Mapping Zenith Wet Delays onto Precipitable Water
Journal of Applied Meteorology, 1994Abstract Emerging networks of Global Positioning System (GPS) receivers can be used in the remote sensing of atmospheric water vapor. The time-varying zenith wet delay observed at each GPS receiver in a network can be transformed into an estimate of the precipitable water overlying that receiver.
Michael Bevis +6 more
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Comparison of Tropospheric Zenith Wet Delay from VLBI and GNSS Estimations
2021<p>Tropospheric delay is one of the major error sources for space geodetic techniques such as Very Long Baseline Interferometry (VLBI) and Global Navigation Satellite System (GNSS). In this study, we compared the agreement of tropospheric zenith wet delay (ZWD) seasonal variations derived from VLBI and GNSS observations at 8 stations that
Vicky Jia Liu +2 more
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Global empirical model for mapping zenith wet delays onto precipitable water
Journal of Geodesy, 2013We can map zenith wet delays onto precipitable water with a conversion factor, but in order to calculate the exact conversion factor, we must precisely calculate its key variable $$T_\mathrm{m}$$ . Yao et al. (J Geod 86:1125–1135, 2012.
Yi Bin Yao +4 more
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A priori zenith wet delays in the analysis of VLBI CONT sessions
Advances in Space Research, 2021Abstract Tropospheric delay is one of the major sources of error in VLBI (Very Long Baseline Interferometry) analysis. The principal component of this error can be accurately computed through reliable surface pressure data —hydrostatic delay— yet there is also a small but volatile component —wet delay— which is difficult to be modelled a priori.
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Development of a global model for zenith wet delays based on the random forest approach
2022<p>Tropospheric delays have been a major error source for space geodetic techniques and the performance of their modeling is significantly limited due to the high spatiotemporal variability of the moisture in the lower atmosphere. In this study, tropospheric zenith wet delay (ZWD) modeling was realized based on the machine learning ...
Qinzheng Li +3 more
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