A grid-based tropospheric product for China using a GNSS network

doi:10.1007/s00190-017-1093-z

CORC > 武汉植物园 > 中国科学院武汉植物园

	A grid-based tropospheric product for China using a GNSS network
	Zhang, Baocheng 1; Li, Wei 1; Yuan, Yunbin 1; Zhang, Hongxing 1,2; Ou, Jikun 1
刊名	JOURNAL OF GEODESY
	2018-07-01
卷号	92 期号:7 页码:765-777
关键词	Global navigation satellite systems (GNSS) Zenith tropospheric delay (ZTD) IGGtrop model Grid-based tropospheric product (GTP) Undifferenced and uncombined precise point positioning (UU-PPP)
ISSN号	0949-7714
DOI	10.1007/s00190-017-1093-z
英文摘要	Tropospheric delay accounts for one source of error in global navigation satellite systems (GNSS). To better characterize the tropospheric delays in the temporal and spatial domain and facilitate the safety-critical use of GNSS across China, a method is proposed to generate a grid-based tropospheric product (GTP) using the GNSS network with an empirical tropospheric model, known as IGGtrop. The prototype system generates the GTPs in post-processing and real-time modes and is based on the undifferenced and uncombined precise point positioning (UU-PPP) technique. GTPs are constructed for a grid form ( latitude-longitude) over China with a time resolution of 5 min. The real-time GTP messages are encoded in a self-defined RTCM3 format and broadcast to users using NTRIP (networked transport of RTCM via internet protocol), which enables efficient and safe transmission to real-time users. Our approach for GTP generation consists of three sequential steps. In the first step, GNSS-derived zenith tropospheric delays (ZTDs) for a network of GNSS stations are estimated using UU-PPP. In the second step, vertical adjustments for the GNSS-derived ZTDs are applied to address the height differences between the GNSS stations and grid points. The ZTD height corrections are provided by the IGGtrop model. Finally, an inverse distance weighting method is used to interpolate the GNSS-derived ZTDs from the surrounding GNSS stations to the location of the grid point. A total of 210 global positioning system (GPS) stations from the crustal movement observation network of China are used to generate the GTPs in both post-processing and real-time modes. The accuracies of the GTPs are assessed against with ERA-Interim-derived ZTDs and the GPS-derived ZTDs at 12 test GPS stations, respectively. The results show that the post-processing and real-time GTPs can provide the ZTDs with accuracies of 1.4 and 1.8 cm, respectively. We also apply the GTPs in real-time kinematic GPS PPP, and the results show that the convergence time of the PPP solutions is shortened. These results confirm that the GTPs can act as an efficient information source to augment GNSS positioning over China.
资助项目	National Key R&D Program of China, Collaborative Precision Positioning Project[2016YFB0501900] ; China Natural Science Funds[41674022] ; China Natural Science Funds[41574032] ; China Natural Science Funds[41574015] ; Key National Natural Science Foundation of China (NSFC)[41231064]
WOS研究方向	Geochemistry & Geophysics ; Remote Sensing
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000435585000004
内容类型	期刊论文
源URL	[http://202.127.146.157/handle/2RYDP1HH/5493]
专题	中国科学院武汉植物园
通讯作者	Yuan, Yunbin; Zhang, Hongxing
作者单位	1.Chinese Acad Sci, Inst Geodesy & Geophys, State Key Lab Geodesy & Earths Dynam, Wuhan, Hubei, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Baocheng,Li, Wei,Yuan, Yunbin,et al. A grid-based tropospheric product for China using a GNSS network[J]. JOURNAL OF GEODESY,2018,92(7):765-777.
APA	Zhang, Baocheng,Li, Wei,Yuan, Yunbin,Zhang, Hongxing,&Ou, Jikun.(2018).A grid-based tropospheric product for China using a GNSS network.JOURNAL OF GEODESY,92(7),765-777.
MLA	Zhang, Baocheng,et al."A grid-based tropospheric product for China using a GNSS network".JOURNAL OF GEODESY 92.7(2018):765-777.