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A New Zenith Tropospheric Delay Grid Product for Real-Time PPP Applications over China

Yidong Lou, Jinfang Huang, Weixing Zhang, Hong Liang, Fu Zheng, Jingnan Liu
2017 Sensors  
The real-time ZTD grid product (RtZTD) over China was then generated with a time interval of 5 min.  ...  To provide wide-area real-time high precision zenith tropospheric delay (ZTD), the temporal and spatial variations of ZTD with altitude were analyzed on the bases of the latest meteorological reanalysis  ...  real-time ZTD solutions at GPS stations at a national scale over China for the generation of the real-time ZTD grid product.  ... 
doi:10.3390/s18010065 pmid:29280983 pmcid:PMC5795408 fatcat:xkiuzo7swnamzn2bsctjapfxt4

Comparative analysis of blind tropospheric correction models in Ghana

S. Osah, A. A. Acheampong, C. Fosu, I. Dadzie
2021 Journal of Geodetic Science  
Operating Reference Stations (CORS) using the 1˚x1˚ gridded Vienna Mapping Function 3 (VMF3) zenith tropospheric delay (ZTD) product as a reference.  ...  For precise GNSS applications, tropospheric delay has to be mitigated as accurately as possible using tropospheric delay prediction models.  ...  More thanks also to Dr Quaye Ballard for his immense contributions and review.  ... 
doi:10.1515/jogs-2020-0104 fatcat:odguitqzlvdkxjn3cmcvgwvgam

A New Four-Layer Inverse Scale Height Grid Model of China for Zenith Tropospheric Delay Correction

Shaotian Zhang, Xiaoming Wang, Zishen Li, Cong Qiu, Jinglei Zhang, Haobo Li, Li Li
2020 IEEE Access  
zenith tropospheric delay (ZTD), which consists of two parts, the zenith hydrostatic delay (ZHD) and the zenith wet delay (ZWD) [3] .  ...  PPP-RTK is a new generation of positioning technology, merging the advantages of precise point positioning (PPP) and real-time kinematic (RTK) [15, 16] .  ...  Author Name: Preparation of Papers for IEEE Access (February 2017) VOLUME XX, 2017  ... 
doi:10.1109/access.2020.3038678 fatcat:q26a3horb5b5haui3vjswnwrkq

Comparison of advanced troposphere models for aiding reduction of PPP convergence time in Australia

M. Deo, A. El-Mowafy
2018 Journal of Spatial Science  
Next, the PPP convergence time and achievable accuracy using the BoM NWM constrained ZTD by including them as pseudo-observations with a pre-set precision was compared to the case of estimating the troposphere  ...  This paper firstly analyses the precision of tropospheric zenith total delay (ZTD) values obtained from the empirical models GPT2 and GPT2w, and the numerical weather models (NWM) from Australian Bureau  ...  ., 2009 ) is acknowledged for provision of the precise orbit and clock products to enable simulation of RINEX data.  ... 
doi:10.1080/14498596.2018.1472046 fatcat:uvswhxho3fgdvoqv2lz5t6bjhu

Review of the state of the art and future prospects of the ground-based GNSS meteorology in Europe

Guergana Guerova, Jonathan Jones, Jan Douša, Galina Dick, Siebren de Haan, Eric Pottiaux, Olivier Bock, Rosa Pacione, Gunnar Elgered, Henrik Vedel, Michael Bender
2016 Atmospheric Measurement Techniques  
The advances in GNSS processing for derivation of tropospheric products, application of GNSS tropospheric products in operational weather prediction and application of GNSS tropospheric products for climate  ...  </strong> Global navigation satellite systems (GNSSs) have revolutionised positioning, navigation, and timing, becoming a common part of our everyday life.  ...  Soehne, Federal Agency for Cartography and Geodesy (BKG), Germany, is acknowledged for the generation of the EUREF ZTD product. J.  ... 
doi:10.5194/amt-9-5385-2016 fatcat:4tnhaguthra43oad4ijy33op7m

Assessment of Three Tropospheric Delay Models (IGGtrop, EGNOS and UNB3m) Based on Precise Point Positioning in the Chinese Region

Hongxing Zhang, Yunbin Yuan, Wei Li, Ying Li, Yanju Chai
2016 Sensors  
PPP is from 21 base stations of CMONOC for a whole year of 2012.  ...  Firstly, we assess the models using 5 years' Global Positioning System (GPS) derived Zenith Tropospheric Delay (ZTD) series from 25 stations of the Crustal Movement Observation Network of China (CMONOC  ...  Acknowledgments: We acknowledge the CMONOC for providing the GPS data and the IGS for providing ZTD products. We acknowledge the anonymous reviewers for their helpful comments on our paper.  ... 
doi:10.3390/s16010122 pmid:26805834 pmcid:PMC4732155 fatcat:rzorjvf3hzfpfngmuneeqcyawi

Establishment of a Real-Time Local Tropospheric Fusion Model

Yao, Xu, Xu, Peng, Wan
2019 Remote Sensing  
Some grid-based empirical tropospheric delay models directly provide tropospheric parameters at a global scale and in real time without any auxiliary information.  ...  With the rapid development of satellite navigation systems around the globe, the demand for real-time high-precision GNSS positioning services has been growing dramatically, requiring real-time and high-accuracy  ...  Acknowledgments: The authors would like to thank for Hong Kong SatRef Network providing experimental data.  ... 
doi:10.3390/rs11111321 fatcat:btckg4thnzbvbligqldtmtzlni

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

Peng Sun, Kefei Zhang, Suqin Wu, Moufeng Wan, Yun Lin
2021 Remote Sensing  
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  ...  The a priori zenith hydrostatic delay (ZHD) and the mapping function used in the PPP approach are the two factors that could affect the accuracy of the PPP-based ZTD significantly.  ...  Acknowledgments: We would like to thank the IGS for the provision of GPS observations and tropospheric products, and also thank the IGRA and TU Wien for the provision of radiosonde profiles and VMF products  ... 
doi:10.3390/rs13163245 fatcat:esggowldm5d7pht26c73pqgqju

Improved Zenith Tropospheric Delay Modeling Using the Piecewise Model of Atmospheric Refractivity

Liu Yang, Jingxiang Gao, Dantong Zhu, Nanshan Zheng, Zengke Li
2020 Remote Sensing  
To verify the performance of RGZTD model, the ERA5 ZTD data in 2017–2018, the radiosonde ZTD data from 86 radiosonde stations over China in 2017–2018, and the tropospheric delay products on 251 GNSS stations  ...  As one of the atmosphere propagation delays, the tropospheric delay is a significant error source that should be properly handled in high-precision global navigation satellite system (GNSS) applications  ...  Acknowledgments: The authors are also grateful for the ERA5 reanalysis produced by ECMWF, the radiosonde provided by University of Wyoming and the CMONOC tropospheric products produced by GNSS data product  ... 
doi:10.3390/rs12233876 fatcat:vs475ovvqbg57gcf6jrfan6iai

Review of the state-of-the-art and future prospects of the ground-based GNSS meteorology in Europe

Guergana Guerova, Jonathan Jones, Jan Dousa, Galina Dick, Siebren de Haan, Eric Pottiaux, Olivier Bock, Rosa Pacione, Gunnar Elgered, Henrik Vedel, Michael Bender
2016 Atmospheric Measurement Techniques Discussions  
Discussed are the advances in GNSS processing for derivation of tropospheric products, application of GNSS tropospheric products in operational weather prediction and application of GNSS tropospheric products  ...  Global Navigation Satellite Systems (GNSS) have revolutionised positioning, navigation, and timing, becoming a common part of our everyday life.  ...  Soehne, Federal Agency for Cartography and Geodesy (BKG),  ... 
doi:10.5194/amt-2016-125 fatcat:l2txrnmiynf7ri6eoymgkecq6i

GPS/BDS Medium/Long-Range RTK Constrained with Tropospheric Delay Parameters from NWP Model

Ying Xu, Chen Wu, Lei Li, Lizi Yan, Min Liu, Shengli Wang
2018 Remote Sensing  
Tropospheric delay is a major error source that affects the performance of the Global Navigation Satellite Systems (GNSS) Real Time Kinematic (RTK) positioning especially for the medium/long-range baseline  ...  In this study, we develop a new GPS/BDS RTK algorithm constrained with a tropospheric delay parameters from Numerical weather prediction (NWP) model for medium/long-range baselines.  ...  A reliable real-time PPP service can provide precise positioning on a global scale [1] . However, PPP needs a comparatively long initialization time of about 20 min [2] .  ... 
doi:10.3390/rs10071113 fatcat:uhs5ymhdcnb4jcwdfijlovtyvu

Evaluation of Zenith Tropospheric Delay Derived from Ray-Traced VMF3 Product over the West African Region Using GNSS Observations

Samuel Osah, Akwasi A. Acheampong, Collins Fosu, Isaac Dadzie, Stefania Bonafoni
2021 Advances in Meteorology  
The IGS provides highly accurate and highly reliable daily time-series Zenith Tropospheric Delay (ZTD) products using data from the member sites towards the use of GNSS for precise geodetic, climatological  ...  This result is an indication that the VMF3-ZTD product is accurate enough to be used as an alternative source of ZTD data to augment the IGS final ZTD product for positioning and meteorological applications  ...  accuracy of the GGOS-ZTD grid products and its application in PPP.  ... 
doi:10.1155/2021/8836806 fatcat:5zakliu4dvghtbnwxzkw2wx5o4

Evaluation of Zenith Tropospheric Delay Derived from ERA5 Data over China Using GNSS Observations

Chunhua Jiang, Tianhe Xu, Shuaimin Wang, Wenfeng Nie, Zhangzhen Sun
2020 Remote Sensing  
The latest reanalysis of the European Center for Medium-Range Weather Forecasts (ECMWF), ERA5, can provide atmospheric data for calculating Zenith Tropospheric Delay (ZTD) with hourly temporal resolution  ...  , which is a key factor in Global Navigation Satellite System (GNSS) high-precision application.  ...  Acknowledgments: The authors would like to extend their sincere gratitude to ECEMWF and CMONOC for providing the relevant data. Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/rs12040663 fatcat:g6czwo7gtrbctbms3dcsxlgat4

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

Liying Cao, Bao Zhang, Junyu Li, Yibin Yao, Lilong Liu, Qishun Ran, Zhaohui Xiong
2021 Remote Sensing  
When validating the Zenith Tropospheric Delay (ZTD) products (the sum of ZHD and ZWD) using the IGS ZTD data, the CTropGrid ZTD has a bias of −0.7 mm and an RMS of 35.8 mm, which is 22.7% better than the  ...  To address this limitation, we propose to estimate Zenith Hydrostatic Delay (ZHD), Zenith Wet Delay (ZWD), and Tm directly from the stratified numerical weather forecasting products of the mesoscale version  ...  Acknowledgments: The authors would like to thank IGRA and GRAPES_MESO for providing access to the web-based meteorological data and the International GNSS Service (IGS) for providing precise ZTD data.  ... 
doi:10.3390/rs13132644 fatcat:j457566gcnfkjkrlzymheessi4

Mitigation of Ionospheric Delay in GPS/BDS Single Frequency PPP: Assessment and Application [chapter]

Zishen Li, Lei Fan, Yunbin Yuan, Sandra Verhagen, Peter de Bakker, Hong Yuan, Shiming Zhong
2014 Lecture Notes in Electrical Engineering  
Single-frequency (SF) Precise Point Positioning (PPP) is a promising technique for real-time positioning and navigation at sub-meter (about 0.5 m) accuracy level because of its convenience and low cost  ...  Validation results show that a set of reference stations is critical for SF PPP with sub-meter positioning accuracy, especially in China.  ...  The latency of final product is about 2 weeks and thus cannot be used in real-time or near-real-time application.  ... 
doi:10.1007/978-3-642-54743-0_39 fatcat:hvzzjnfkbjfkzicuikxedyp4oi
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