DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Quality assessment of GPS, Galileo and BeiDou-2/3 satellite broadcast group delays

Wang, Ningbo and Li, Zishen and Montenbruck, Oliver and Tang, Chenpang (2019) Quality assessment of GPS, Galileo and BeiDou-2/3 satellite broadcast group delays. Advances in Space Research, 64 (9), pp. 1764-1779. Elsevier. DOI: 10.1016/j.asr.2019.07.029 ISSN 0273-1177

Full text not available from this repository.


The quality of broadcast group delays (BGDs) transmitted in the navigation messages of the Global Positioning System (GPS), BeiDou-2/3 and Galileo is assessed by comparison with multi-GNSS differential code bias (DCB) products generated at the Chinese Academy of Sciences (CAS). An automatic DCB (AutoDCB) realignment procedure is presented to handle discontinuities within individual BGD/DCB series. The analysis is performed over a four-year period starting from January 2014. For GPS, the consistency between broadcast timing group delays (TGDs) and CAS MGEX DCBs is 0.25 ns, and the corresponding values are 0.05, 0.3 and 0.45 ns for L1C/A, L2C and L5Q inter-signal corrections (ISCs), respectively. The best agreement between GPS L2C ISCs and CAS MGEX C1W-C2L DCBs is emphasized. The inconsistency between broadcast and post-processed C2I-C6I DCBs (=TGD1) is found to decrease from 1.5 to 0.45 ns across the entire BeiDou-2 constellation since late July 2017, indicating a significant quality improvement of BeiDou-2 transmitted TGD1 parameters. A systematic offset of around 4.0 ns is found between TGD1 reference datums of BeiDou-3 and BeiDou-2 constellations, which needs to be removed in the combined BeiDou-2/3 B1I single-frequency or B1I+B3I dual-frequency standard positioning applications. Aside from the increasingly improved repeatability of broadcast E1-E5a/5b delays, an overall agreement at the level of 0.1-0.4 ns is achieved between Galileo transmitted value and DCB metadata from European GNSS Agency (GSA) for the in-orbit validation (IOV) satellites. In the comparison of Galileo BGDs and CAS MGEX DCBs, the consistency is at the level of 0.4 and 0.3 ns for IOV and full operation capability (FOC) satellites, respectively. The requirement of the routine assessment of broadcast group delays is also emphasized, in particular for newly launched satellites of new constellations.

Item URL in elib:https://elib.dlr.de/130979/
Document Type:Article
Title:Quality assessment of GPS, Galileo and BeiDou-2/3 satellite broadcast group delays
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Montenbruck, OliverDLR/GSOChttps://orcid.org/0000-0003-4783-745X
Journal or Publication Title:Advances in Space Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.asr.2019.07.029
Page Range:pp. 1764-1779
Keywords:Timing group delay (TGD); Broadcast group delay (BGD); Inter-signal correction (ISC); Global Positioning System (GPS); Galileo; BeiDou-3 global system
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben Infrastruktur und Unterstützung für Raumflugbetrieb
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training
Deposited By: Montenbruck, Dr.rer.nat.hab. Oliver
Deposited On:25 Nov 2019 17:55
Last Modified:25 Nov 2019 17:55

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.