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Open AccessArticle

Establishment and Evaluation of a New Meteorological Observation-Based Grid Model for Estimating Zenith Wet Delay in Ground-Based Global Navigation Satellite System (GNSS)

by Yibin Yao 1,2, Zhangyu Sun 1 and Chaoqian Xu 1,*
1
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
2
Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(11), 1718; https://doi.org/10.3390/rs10111718
Received: 8 September 2018 / Revised: 7 October 2018 / Accepted: 26 October 2018 / Published: 31 October 2018
(This article belongs to the Special Issue GPS/GNSS Contemporary Applications)
With the availability to high-accuracy a priori zenith wet delay (ZWD) data, the positioning efficiency of the precise point positioning (PPP) processing can be effectively improved, including accelerating the convergence time and improving the positioning precision, in ground-based Global Navigation Satellite System (GNSS) technology. Considering the limitations existing in the state-of-the-art ZWD models, this paper established and evaluated a new in-situ meteorological observation-based grid model for estimating ZWD named GridZWD using the radiosonde data and the European Centre for Medium-Range Weather Forecasts (ECWMF) data. The results show that ZWD has a strong correlation with the meteorological parameter water vapor pressure in continental and high-latitude regions. The root of mean square error (RMS) of 24.6 mm and 36.0 mm are achievable by the GridZWD model when evaluated with the ECWMF data and the radiosonde data, respectively. An accuracy improvement of approximately 10%~30% compared with the state-of-the-art models (e.g., the Saastamoinen, Hopfield and GPT2w models) can be found for the new built model. View Full-Text
Keywords: GNSS; ZWD; water vapor pressure; in-situ meteorological observation-based grid model GNSS; ZWD; water vapor pressure; in-situ meteorological observation-based grid model
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  • Externally hosted supplementary file 1
    Doi: https://github.com/szy1753814280/GridZWD-model
    Link: https://github.com/szy1753814280/GridZWD-model
    Description: This is a data respository related to the paper "Establishment and Evaluation of a New Meteorological Parameter-based Grid Model for Estimating Zenith Wet Delay in Ground-based GNSS". The grid coeffcients and the MATLAB program of the model GridZWD built in our paper are provided in this respository.
MDPI and ACS Style

Yao, Y.; Sun, Z.; Xu, C. Establishment and Evaluation of a New Meteorological Observation-Based Grid Model for Estimating Zenith Wet Delay in Ground-Based Global Navigation Satellite System (GNSS). Remote Sens. 2018, 10, 1718.

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