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Performance of Galileo products determined from multi-frequency measurements

Duan, Bingbing and Hugentobler, Urs and Montenbruck, Oliver and Steigenberger, Peter (2023) Performance of Galileo products determined from multi-frequency measurements. Journal of Geodesy, 97 (4). Springer. doi: 10.1007/s00190-023-01723-3. ISSN 0949-7714.

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Each Galileo satellite provides coherent navigation signals in four distinct frequency bands. International GNSS Service (IGS) analysis centers (ACs) typically determine Galileo satellite products based on the E1/E5a dual-frequency measurements due to the software limitation and the limited tracking capability of other signals in the early time. The goal of this contribution is to evaluate the quality of Galileo satellite products determined by using different dual-frequency (E1/E5a, E1/E5b, E1/E5, E1/E6) and multi-frequency (E1/E5a/E5b/E5/E6) measurements based on different sizes of ground networks. The performance of signal noise, the consistency of frequency-specific satellite phase center offsets and the stability of satellite phase biases are assessed in advance to confirm preconditions for multi-frequency processing. Orbit results from different dual-frequency measurements show that orbit precision determined from E1/E6 is clearly worse (about 35%) than that from other dual-frequency solutions. In view of a similar E1, E5a, E5b and E6 measurement quality, the degraded E1/E6 orbit performance is mainly attributed to the unfavorable noise amplification in the respective ionosphere-free linear combination. The advantage of using multi-frequency measurements over dual-frequency for precise orbit determination is clearly visible when using small networks. For instance, the ambiguity fixing rate is 80% for the multi-frequency solution while it is less than 40% for the dual-frequency solution if 150 s data sampling is employed in a 15-station network. Higher fixing rates result in better (more than 30%) satellite orbits and more robust satellite clock and phase bias products. In general, satellite phase bias products determined from a 20-station (or more) network are precise enough to conduct precise point positioning with ambiguity resolution (PPP-AR) applications. Multi-frequency kinematic PPP-AR solutions always show 5–10% precision improvement compared to those computed from dual-frequency observations.

Item URL in elib:https://elib.dlr.de/194528/
Document Type:Article
Title:Performance of Galileo products determined from multi-frequency measurements
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Duan, BingbingTUMhttps://orcid.org/0000-0002-0143-835XUNSPECIFIED
Hugentobler, UrsTUMhttps://orcid.org/0000-0003-0801-8259UNSPECIFIED
Montenbruck, OliverDLR/GSOChttps://orcid.org/0000-0003-4783-745XUNSPECIFIED
Steigenberger, PeterDLR/GSOChttps://orcid.org/0000-0003-1905-6699147855751
Date:29 March 2023
Journal or Publication Title:Journal of Geodesy
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Galileo, Multi-frequency, Dual-frequency, High-accuracy products, E6 signal
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Infrastructure, Flight Dynamics, GPS
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training
Deposited By: Montenbruck, Dr.rer.nat.hab. Oliver
Deposited On:30 Mar 2023 09:58
Last Modified:01 Dec 2023 08:52

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