SHAtropE-A Regional Gridded ZTD Model for China and the Surrounding Areas

doi:10.3390/rs12010165

CORC > 国家天文台 > 中国科学院国家天文台

	SHAtropE-A Regional Gridded ZTD Model for China and the Surrounding Areas
	Chen, Junping 1,2,3; Wang, Jungang 1; Wang, Ahao 1,4; Ding, Junsheng 1; Zhang, Yize 1,5
刊名	REMOTE SENSING
	2020
卷号	12 期号:1 页码:17
关键词	GNSS tropospheric modeling SHAtropE precise point positioning
DOI	10.3390/rs12010165
英文摘要	A regional zenith tropospheric delay (ZTD) empirical model, referred to as SHAtropE (SHanghai Astronomical observatory tropospheric delay model-Extended), is developed and provides tropospheric propagation delay corrections for users in China and the surrounding areas with improved accuracy. The SHAtropE model was developed based on the ZTD time series of the continuous GNSS sites from the Crustal Movement Observation Network of China (CMONOC) and GNSS sites of surrounding areas. It combines the exponential and periodical functions and is provided as regional grids with a resolution of 2.5 degrees x 2.0 degrees in longitude and latitude. At each grid point, the exponential function converts the ZTD from the site height to the ellipsoid, and the periodical terms, including both annual and semi-annual periods, describe ZTD's temporal variation. Moreover, SHAtropE also provides the predicted ZTD uncertainty, which is valuable in Precise Point Positioning (PPP) with ZTD being constrained for faster convergence. The data of 310 GNSS sites over 7 years were used to validate the new model. Results show that the SHAtropE ZTD has an accuracy of 3.5 cm in root mean square (RMS) quantity, which has a mean improvement of 35.2% and 5.4% over the UNB3m (5.4 cm) and GPT3 (3.7 cm) models, respectively. The predicted uncertainty of SHAtropE ZTD shows seasonal variations, where the values are larger in summer than in winter. By applying the SHAtropE model in the static PPP, the convergence time of GPS-only and BDS-only solutions are reduced by 8.1% and 14.5% respectively compared to the UNB3m model, and the reductions are 6.9% and 11.2% respectively for the GPT3 model. As no meteorological data are required for the implementation of the model, the SHAtropE could thus be a refined tropospheric model for GNSS users in mainland China and the surrounding areas. The method of modeling the ZTD uncertainty can also be used in further global tropospheric delay modeling.
资助项目	National Natural Science Foundation of China[11673050] ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone[ZJ2018-ZD-009] ; National Key R&D Program of China[2018YFB0504300] ; Key R&D Program of Guangdong province[2018B030325001]
WOS关键词	MAPPING FUNCTION GMF ; TROPOSPHERIC DELAY ; EMPIRICAL-MODEL ; SLANT DELAYS ; WATER-VAPOR ; TIME ; BEIDOU ; INTERFEROMETRY ; PRODUCTS
WOS研究方向	Remote Sensing
语种	英语
出版者	MDPI
WOS记录号	WOS:000515391700165
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; National Key R&D Program of China ; National Key R&D Program of China ; Key R&D Program of Guangdong province ; Key R&D Program of Guangdong province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; National Key R&D Program of China ; National Key R&D Program of China ; Key R&D Program of Guangdong province ; Key R&D Program of Guangdong province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; National Key R&D Program of China ; National Key R&D Program of China ; Key R&D Program of Guangdong province ; Key R&D Program of Guangdong province ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; Key Program of Special Development funds of Zhangjiang National Innovation Demonstration Zone ; National Key R&D Program of China ; National Key R&D Program of China ; Key R&D Program of Guangdong province ; Key R&D Program of Guangdong province
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/54441]
专题	中国科学院国家天文台
通讯作者	Wang, Jungang
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Shanghai Key Lab Space Nav & Positioning Tech, Shanghai Astron Observ, Shanghai 200030, Peoples R China 4.Tongji Univ, Coll Surveying & Geoinformat, Shanghai 200092, Peoples R China 5.Tokyo Univ Marine Sci & Technol, Coll Marine Technol, Tokyo 1358533, Japan
推荐引用方式 GB/T 7714	Chen, Junping,Wang, Jungang,Wang, Ahao,et al. SHAtropE-A Regional Gridded ZTD Model for China and the Surrounding Areas[J]. REMOTE SENSING,2020,12(1):17.
APA	Chen, Junping,Wang, Jungang,Wang, Ahao,Ding, Junsheng,&Zhang, Yize.(2020).SHAtropE-A Regional Gridded ZTD Model for China and the Surrounding Areas.REMOTE SENSING,12(1),17.
MLA	Chen, Junping,et al."SHAtropE-A Regional Gridded ZTD Model for China and the Surrounding Areas".REMOTE SENSING 12.1(2020):17.