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Precise orbit determination of the Sentinel-3A altimetry satellite using ambiguity-fixed GPS carrier phase observations

Montenbruck, Oliver and Hackel, Stefan and Jäggi, Adrian (2017) Precise orbit determination of the Sentinel-3A altimetry satellite using ambiguity-fixed GPS carrier phase observations. Journal of Geodesy. Springer. DOI: 10.1007/s00190-017-1090-2 ISSN 0949-7714

Full text not available from this repository.

Abstract

The Sentinel-3 mission performs routine measurements of sea surface heights and depends crucially on accurate and precise knowledge of the spacecraft. Orbit determination with a targeted uncertainty of less than 2 cm in radial direction is supported through an onboard Global Positioning System (GPS) receiver, a DORIS (Doppler Orbitography and Radiopositioning Integrated by Satellite) instrument, and a complementary laser retro reflector for satellite laser ranging (SLR). Within this study, the potential of ambiguity-fixing for GPS-only precise orbit determination (POD) of the Sentinel-3 spacecraft is assessed. A refined strategy for carrier phase generation out of low level measurements is employed to cope with half-cycle ambiguities in the tracking of the Sentinel-3 GPS receiver, that have so far inhibited ambiguity-fixed POD solutions. Rather than explicitly fixing double-difference phase ambiguities with respect to a network of terrestrial reference stations, a single-receiver ambiguity resolution concept is employed that builds on dedicated GPS orbit, clock, and wide-lane bias products provided by the CNES/CLS (Centre National d'Etudes Spatiales / Collecte Localisation Satellites) analysis center of the International GNSS Service. Compared to float ambiguity solutions, a notably improved precision can be inferred from laser ranging residuals. These decrease from roughly 9 mm down to 5 mm standard deviation for high-grade stations on average over low and high elevations. Furthermore, the ambiguity-fixed orbits offer a substantially improved cross-track accuracy and help to identify lateral offsets in the GPS antenna or center- of-mass (CoM) location. With respect to altimetry, the improved orbit precision also benefits the global consistency of sea-surface measurements. However, modeling of the absolute height continues to rely on proper dynamical models for the spacecraft motion as well as ground calibrations for the relative position of the altimeter reference point and the CoM.

Item URL in elib:https://elib.dlr.de/115849/
Document Type:Article
Title:Precise orbit determination of the Sentinel-3A altimetry satellite using ambiguity-fixed GPS carrier phase observations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Montenbruck, Oliveroliver.montenbruck (at) dlr.deUNSPECIFIED
Hackel, Stefanstefan.hackel (at) dlr.deUNSPECIFIED
Jäggi, AdrianaiubUNSPECIFIED
Date:2017
Journal or Publication Title:Journal of Geodesy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1007/s00190-017-1090-2
Publisher:Springer
ISSN:0949-7714
Status:Published
Keywords:Sentinel-3; single-receiver ambiguity fixing; precise orbit determination; GPS; SLR; altimetry
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:22 Nov 2017 16:27
Last Modified:10 Jan 2019 15:48

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