The Impact of Satellite Time Group Delay and Inter-Frequency Differential Code Bias Corrections on Multi-GNSS Combined Positioning

doi:10.3390/s17030602

	The Impact of Satellite Time Group Delay and Inter-Frequency Differential Code Bias Corrections on Multi-GNSS Combined Positioning
	Ge, Yulong 1,2,3; Zhou, Feng 4,5; Sun, Baoqi 1,2,3; Wang, Shengli 6; Shi, Bo 7
刊名	SENSORS
	2017-03-01
卷号	17 期号:3 页码:20
关键词	GNSS quad-constellation time group delay (TGD) differential code bias (DCB) standard point positioning precise point positioning
ISSN号	1424-8220
DOI	10.3390/s17030602
英文摘要	We present quad-constellation (namely, GPS, GLONASS, BeiDou and Galileo) time group delay (TGD) and differential code bias (DCB) correction models to fully exploit the code observations of all the four global navigation satellite systems (GNSSs) for navigation and positioning. The relationship between TGDs and DCBs for multi-GNSS is clearly figured out, and the equivalence of TGD and DCB correction models combining theory with practice is demonstrated. Meanwhile, the TGD/DCB correction models have been extended to various standard point positioning (SPP) and precise point positioning (PPP) scenarios in a multi-GNSS and multi-frequency context. To evaluate the effectiveness and practicability of broadcast TGDs in the navigation message and DCBs provided by the Multi-GNSS Experiment (MGEX), both single-frequency GNSS ionosphere-corrected SPP and dual-frequency GNSS ionosphere-free SPP/PPP tests are carried out with quad-constellation signals. Furthermore, the author investigates the influence of differential code biases on GNSS positioning estimates. The experiments show that multi-constellation combination SPP performs better after DCB/TGD correction, for example, for GPS-only b1-based SPP, the positioning accuracies can be improved by 25.0%, 30.6% and 26.7%, respectively, in the N, E, and U components, after the differential code biases correction, while GPS/GLONASS/BDS b1-based SPP can be improved by 16.1%, 26.1% and 9.9%. For GPS/BDS/Galileo the 3rd frequency based SPP, the positioning accuracies are improved by 2.0%, 2.0% and 0.4%, respectively, in the N, E, and U components, after Galileo satellites DCB correction. The accuracy of Galileo-only b1-based SPP are improved about 48.6%, 34.7% and 40.6% with DCB correction, respectively, in the N, E, and U components. The estimates of multi-constellation PPP are subject to different degrees of influence. For multi-constellation combination SPP, the accuracy of single-frequency is slightly better than that of dual-frequency combinations. Dual-frequency combinations are more sensitive to the differential code biases, especially for the 2nd and 3rd frequency combination, such as for GPS/BDS SPP, accuracy improvements of 60.9%, 26.5% and 58.8% in the three coordinate components is achieved after DCB parameters correction. For multi-constellation PPP, the convergence time can be reduced significantly with differential code biases correction. And the accuracy of positioning is slightly better with TGD/DCB correction.
资助项目	National Natural Science Foundation of China[41104021] ; National Natural Science Foundation of China[11173026] ; international GNSS Monitoring and Assessment System (iGMAS)
WOS关键词	MODEL ; GPS ; MAPS
WOS研究方向	Chemistry ; Electrochemistry ; Instruments & Instrumentation
语种	英语
出版者	MDPI AG
WOS记录号	WOS:000398818700175
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; international GNSS Monitoring and Assessment System (iGMAS) ; international GNSS Monitoring and Assessment System (iGMAS) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; international GNSS Monitoring and Assessment System (iGMAS) ; international GNSS Monitoring and Assessment System (iGMAS) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; international GNSS Monitoring and Assessment System (iGMAS) ; international GNSS Monitoring and Assessment System (iGMAS) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; international GNSS Monitoring and Assessment System (iGMAS) ; international GNSS Monitoring and Assessment System (iGMAS)
内容类型	期刊论文
源URL	[http://210.72.145.45/handle/361003/11377]
专题	中国科学院国家授时中心
通讯作者	Sun, Baoqi
作者单位	1.Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Peoples R China 2.Chinese Acad Sci, Key Lab Precise Nav Positioning & Timing Technol, Xian 710600, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.East China Normal Univ, Sch Informat Sci Technol, 500 Dongchuan Rd, Shanghai 200241, Peoples R China 5.German Res Ctr Geosci GFZ, D-14473 Potsdam, Germany 6.Shandong Univ Sci & Technol, Inst Ocean Engn, Qingdao 266590, Peoples R China 7.Shandong Univ Sci & Technol, Coll Geomat, Qingdao 266590, Peoples R China
推荐引用方式 GB/T 7714	Ge, Yulong,Zhou, Feng,Sun, Baoqi,et al. The Impact of Satellite Time Group Delay and Inter-Frequency Differential Code Bias Corrections on Multi-GNSS Combined Positioning[J]. SENSORS,2017,17(3):20.
APA	Ge, Yulong,Zhou, Feng,Sun, Baoqi,Wang, Shengli,&Shi, Bo.(2017).The Impact of Satellite Time Group Delay and Inter-Frequency Differential Code Bias Corrections on Multi-GNSS Combined Positioning.SENSORS,17(3),20.
MLA	Ge, Yulong,et al."The Impact of Satellite Time Group Delay and Inter-Frequency Differential Code Bias Corrections on Multi-GNSS Combined Positioning".SENSORS 17.3(2017):20.