作者:Yao, YB (Yao, Yibin)[ 1,2 ] ; Peng, WJ (Peng, Wenjie)[ 1 ] ; Xu, CQ (Xu, Chaoqian)[ 1 ] ; Cheng, SY (Cheng, Shuyang)[ 3 ]
GEOPHYSICAL JOURNAL INTERNATIONAL
卷: 208 期: 2页: 1217-1230
DOI: 10.1093/gji/ggw451
出版年: FEB 2017
摘要
By introducing two types of zenith troposphere delay (ZTD) products in precise point positioning (PPP), we developed the ZTD-corrected PPP and the ZTD-constrained PPP, both of them reduced the PPP convergence time. Both enhanced PPP methods are examined by global empirical ZTD models and regional ZTD corrections. For global ZTD models, we verified that ZTD-corrected PPP will deviate the positioning results, while ZTD-constrained PPP could produce unbiased estimations. Therefore, the latter is utilized to study the performance of global ZTD models (ITG, GPT2w, GZTD and UNB3m). After numerous experiments, we found that the performance of ZTD models was positively related to the real ZTD accuracy, and we proposed a universal tropospheric stochastic model 2SQR(9rms) which denotes double the square of nine times ZTD rms, to constrain ZTD in PPP. The proposed model subsequently was validated by real-time static and kinematic ZTD-constrained PPP on the premise that the ZTD rms on every station was known. Compared with traditional PPP, in static PPP, the number of improved stations is increased by 15.5 per cent (ITG), 14.4 per cent (GPT2w), 11.1 per cent (GZTD) and 8.3 per cent (UNB3m). For kinematic PPP, PPP constrained by ITG model still had the best performance, the number of improved stations is increased by 14.4 per cent, after 30 min of initialization time, 13.4 cm east, 13.4 cm north and 11.7 cm up positioning accuracy was obtained, compared with 15.3 cm east, 15.3 cm north and 14.3 cm up accuracy by traditional PPP. In addition, experiments using regional ZTD corrections to enhance real-time PPP showed that both ZTD-corrected PPP and ZTD-constrained PPP can notably reduce the convergence time on the vertical component (within 15 cm).
关键词
作者关键词:Satellite geodesy; Space geodetic surveys; Ionosphere/atmosphere interactions
KeyWords Plus:PPP; ECMWF; NCEP; GPS
作者信息
通讯作者地址: Yao, YB (通讯作者)
| Wuhan Univ, Sch Geodesy & Geomat, 129 Luoyu Rd, Wuhan 430079, Peoples R China. |
通讯作者地址: Yao, YB (通讯作者)
| Wuhan Univ, Key Lab Geospace Environm & Geodesy, Minist Educ, 129 Luoyu Rd, Wuhan 430079, Peoples R China. |
地址:
| [ 1 ] Wuhan Univ, Sch Geodesy & Geomat, 129 Luoyu Rd, Wuhan 430079, Peoples R China |
| [ 2 ] Wuhan Univ, Key Lab Geospace Environm & Geodesy, Minist Educ, 129 Luoyu Rd, Wuhan 430079, Peoples R China |
| [ 3 ] Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia |
基金资助致谢
基金资助机构 | 授权号 |
National Natural Science Foundation of China | 41274022 41574028 |
出版商
OXFORD UNIV PRESS, GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
类别/分类
研究方向:Geochemistry & Geophysics
Web of Science类别:Geochemistry & Geophysics
文献信息
文献类型:Article
语种:English
入藏号: WOS:000396817600037
ISSN: 0956-540X
eISSN: 1365-246X
期刊信息
· Impact Factor (影响因子): 2.484
