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Sentinel-6A precise orbit determination using a combined GPS/Galileo receiver

Montenbruck, Oliver und Hackel, Stefan und Wermuth, Martin und Zangerl, Franz (2021) Sentinel-6A precise orbit determination using a combined GPS/Galileo receiver. Journal of Geodesy, 95 (9). Springer. doi: 10.1007/s00190-021-01563-z. ISSN 0949-7714.

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Kurzfassung

The Sentinel-6 (or Jason-CS) altimetry mission provides a long-term extension of the Topex and Jason-1/2/3 missions for ocean surface topography monitoring. Analysis of altimeter data relies on highly-accurate knowledge of the orbital position and requires radial RMS orbit errors of less than 1.5 cm. For precise orbit determination (POD), the Sentinel-6A spacecraft is equipped with a dual-constellation GNSS receiver. We present the results of Sentinel-6A POD solutions for the first 6months since launch and demonstrate a 1-cm consistency of ambiguity-fixed GPS-only and Galileo-only solutions with the dual-constellation product. A similar performance (1.3 cm 3D RMS) is achieved in the comparison of kinematic and reduced dynamic orbits. While Galileo measurements exhibit 30-50% smaller RMS errors than those of GPS, the POD benefits most from the availability of an increased number of satellites in the combined dual-frequency solution. Considering obvious uncertainties in the pre-mission calibration of the GNSS receiver antenna, an independent inflight calibration of the phase centers for GPS and Galileo signal frequencies is required. As such, Galileo observations cannot provide independent scale information and the estimated orbital height is ultimately driven by the employed forces models and knowledge of the center of-mass location within the spacecraft. Using satellite laser ranging (SLR) from selected high-performance stations, a better than 1 cm RMS consistency of SLR normal points with the GNSS-based orbits is obtained, which further improves to 6mm RMS when adjusting site-specific corrections to station positions and ranging biases. For the radial orbit component, a bias of less than 1mm is found from the SLR analysis relative to the mean height of 13 high-performance SLR stations. Overall, the reduced-dynamic orbit determination based on GPS and Galileo tracking is considered to readily meet the altimetry-related Sentinel-6 mission needs for RMS height errors of less than 1.5 cm.

elib-URL des Eintrags:https://elib.dlr.de/143793/
Dokumentart:Zeitschriftenbeitrag
Titel:Sentinel-6A precise orbit determination using a combined GPS/Galileo receiver
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Montenbruck, OliverDLR/GSOChttps://orcid.org/0000-0003-4783-745XNICHT SPEZIFIZIERT
Hackel, StefanDLR/GSOCNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wermuth, MartinDLR/GSOCNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Zangerl, FranzRUAGNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:5 September 2021
Erschienen in:Journal of Geodesy
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:95
DOI:10.1007/s00190-021-01563-z
Verlag:Springer
ISSN:0949-7714
Status:veröffentlicht
Stichwörter:Sentinel-6, Jason-CS, Single-receiver ambiguity fixing, Precise orbit determination, GPS, Galileo, SLR, Altimetry
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 - Infrastruktur, Flugdynamik, GPS
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Raumflugbetrieb und Astronautentraining
Hinterlegt von: Montenbruck, Dr.rer.nat.hab. Oliver
Hinterlegt am:06 Sep 2021 09:51
Letzte Änderung:04 Dez 2023 12:36

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