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Galileo orbit determination using combined GNSS and SLR observations

Hackel, Stefan and Steigenberger, Peter and Hugentobler, Urs and Uhlemann, Maik and Montenbruck, Oliver (2014) Galileo orbit determination using combined GNSS and SLR observations. GPS Solutions, 19, pp. 15-25. Springer. DOI: 10.1007/s10291-013-0361-5 ISSN 1080-5370

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Abstract

The first two Galileo In-Orbit Validation satellites were launched in October 2011 and started continuous signal transmission on all frequencies in early 2012. Both satellites are equipped with two different types of clocks, namely rubidium clocks and hydrogen masers. Based on two test periods, the quality of the Galileo orbit determination based on Global Navigation Satellite System (GNSS) and Satellite Laser Ranging (SLR) observations is assessed. The estimated satellite clock parameters are used as quality indicator for the orbits: A bump at orbital periods in the Allan deviation indicates systematic errors in the GNSS-only orbit determination. These errors almost vanish if SLR observations are considered in addition. As the internal consistency is degraded by the combination, the offset of the SLR reflector is shifted by +5 cm, resulting in an improved orbit consistency as well as accuracy. Another approach to reduce the systematic errors of the GNSS-only orbit determination employs constraints for the clock estimates with respect to a linear model. In general, one decimeter orbit accuracy could be achieved.

Item URL in elib:https://elib.dlr.de/94537/
Document Type:Article
Title:Galileo orbit determination using combined GNSS and SLR observations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hackel, StefanDLR/GSOCUNSPECIFIED
Steigenberger, PeterTUMUNSPECIFIED
Hugentobler, UrsTUMUNSPECIFIED
Uhlemann, MaikGFZUNSPECIFIED
Montenbruck, OliverDLR/GSOCUNSPECIFIED
Date:9 January 2014
Journal or Publication Title:GPS Solutions
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:19
DOI :10.1007/s10291-013-0361-5
Page Range:pp. 15-25
Publisher:Springer
ISSN:1080-5370
Status:Published
Keywords:Galileo, GPS, GNSS, SLR, Orbit Determination
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 > Space Flight Technology
Deposited By: Hackel, Stefan
Deposited On:14 Jan 2015 09:01
Last Modified:14 Jan 2015 09:01

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