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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

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Abstract

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
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wang, NingboCASUNSPECIFIED
Li, ZishenCASUNSPECIFIED
Montenbruck, OliverDLR/GSOChttps://orcid.org/0000-0003-4783-745X
Tang, ChenpangSHAOUNSPECIFIED
Date:2019
Journal or Publication Title:Advances in Space Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:64
DOI :10.1016/j.asr.2019.07.029
Page Range:pp. 1764-1779
Publisher:Elsevier
ISSN:0273-1177
Status:Published
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

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