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Enhanced Orbit Determination of GNSSs with Optical Inter-satellite Links

Michalak, Grzegorz und Giorgi, Gabriele und Deprez, Cécile (2021) Enhanced Orbit Determination of GNSSs with Optical Inter-satellite Links. In: Proceedings of the 34th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2021, Seiten 2838-2847. ION GNSS+ 2021, 2021-09-22, St. Louis, Missouri, USA. doi: 10.33012/2021.18012. ISBN 978-093640629-9.

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Offizielle URL: https://www.ion.org/publications/abstract.cfm?articleID=18012

Kurzfassung

Optical Inter-Satellite Links (OISLs) connecting the Medium Earth Orbit (MEO) satellites of the next-generation GNSSs carry the potential to provide highly precise ranging at the mm to sub-mm level, synchronization of satellite clocks with ps-level accuracy and data communication at 50 Mbps as proposed in the context of the Kepler system. In this paper, we quantified the enhancement in Precise Orbit Determination (POD) and Signal-in-Space Range Errors (SiSREs) for different topologies of OISLs between MEO satellites. We studied the impact of OISL scheduler constraints, orbit modelling errors and observation biases with a full-scale simulation of the Galileo constellation in an scenario where each navigation satellite is additionally equipped with two Laser Communication and Ranging Terminals (LCRTs) for precise inter-satellite ranging and clock synchronization. The POD results and Signal-in-Space Range Errors (SiSREs) were compared to the baseline Galileo scenario with L-band data from ground network of 18 Galileo Sensor Stations (GSSs). We found that SiSRE is robust to OISL scheduler constraints such as the maximum link length and persistence, allowing optimization in terms of required transmit power. SiSRE values of 1-3 mm were obtained with perfect models, an order of magnitude smaller than 1.4 cm obtained with Galileo constellation. When considering large modeling errors in the POD process, we show that a SiSRE value of 1cm is still in principle attainable. This suggests that the OISLs between MEO and Low Earth Orbit satellites, originally considered in the Kepler system, are not that essential to achieve a good POD performance. The OISLs and synchronized clocks enable POD with ground network reduced to just one station under the assumption that station coordinates, the Earth's rotation parameters and the satellite antenna phase center offsets are not considered in the estimation. SiSRE values in this case are close to those obtained with 18 GSSs. We also studied the impact of OISL range biases and ionosphere-free pseudo-range group delay (GD) errors on POD, which showed a significant influence on SiSRE. However, we could demonstrate that these biases can be precisely estimated in the POD process. The OISL range biases could be estimated with a few mm accuracy or better, depending on the modelling errors. A few mm estimation precision was also obtained for the GDs in a POD scenario with one ground station, high-rate L-band data and the station clock synchronized to the satellite clocks. These biases are not expected to be a significant limiting factor for SiSRE in the proposed scenarios.

elib-URL des Eintrags:https://elib.dlr.de/145476/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Enhanced Orbit Determination of GNSSs with Optical Inter-satellite Links
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Michalak, GrzegorzGrzegorz.Michalak (at) dlr.dehttps://orcid.org/0000-0002-1925-8824NICHT SPEZIFIZIERT
Giorgi, Gabrielegabriele.giorgi (at) dlr.dehttps://orcid.org/0000-0003-0552-9790NICHT SPEZIFIZIERT
Deprez, CécileCecile.Deprez (at) dlr.dehttps://orcid.org/0000-0002-3346-0906NICHT SPEZIFIZIERT
Datum:September 2021
Erschienen in:Proceedings of the 34th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2021
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
DOI:10.33012/2021.18012
Seitenbereich:Seiten 2838-2847
ISBN:978-093640629-9
Status:veröffentlicht
Stichwörter:POD, GNSS, Kepler, Optical, Inter-satellite links
Veranstaltungstitel:ION GNSS+ 2021
Veranstaltungsort:St. Louis, Missouri, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:22 September 2021
Veranstalter :ION
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Technik für Raumfahrtsysteme
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R SY - Technik für Raumfahrtsysteme
DLR - Teilgebiet (Projekt, Vorhaben):R - ADVANTAGE - Optische Uhren
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Galileo Kompetenzzentrum
Institut für Kommunikation und Navigation > Navigation
Hinterlegt von: Michalak, Dr. Grzegorz
Hinterlegt am:10 Nov 2021 16:25
Letzte Änderung:24 Apr 2024 20:44

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