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Sentinel-1A - First precise orbit determination results

Peter, Heike and Jäggi, Adrian and Fernández, Jaime and Escobar, Diego and Ayuga, F. and Arnold, Daniel and Wermuth, Martin and Hackel, Stefan and Otten, Michiel and Simons, Wim and Visser, Pieter and Hugentobler, Urs and Féménias, Pierre (2017) Sentinel-1A - First precise orbit determination results. Advances in Space Research, 60 (5), pp. 879-892. Elsevier. DOI: 10.1016/j.asr.2017.05.034 ISSN 0273-1177

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Official URL: http://www.sciencedirect.com/science/article/pii/S0273117717303794

Abstract

Sentinel-1A is the first satellite of the European Copernicus programme. Equipped with a Synthetic Aperture Radar (SAR) instrument the satellite was launched on April 3, 2014. Operational since October 2014 the satellite delivers valuable data for more than two years. The orbit accuracy requirements are given as 5 cm in 3D. In order to fulfill this stringent requirement the precise orbit determination (POD) is based on the dual-frequency GPS observations delivered by an eight-channel GPS receiver. The Copernicus POD (CPOD) Service is in charge of providing the orbital and auxiliary products required by the PDGS (Payload Data Ground Segment). External orbit validation is regularly performed by comparing the CPOD Service orbits to orbit solutions provided by POD expert members of the Copernicus POD Quality Working Group (QWG). The orbit comparisons revealed systematic orbit offsets mainly in radial direction (approx. 3 cm). Although no independent observation technique (e.g. DORIS, SLR) is available to validate the GPS-derived orbit solutions, comparisons between the different antenna phase center variations and different reduced-dynamic orbit determination approaches used in the various software packages helped to detect the cause of the systematic offset. An error in the given geometry information about the satellite has been found. After correction of the geometry the orbit validation shows a significant reduction of the radial offset to below 5 mm. The 5 cm orbit accuracy requirement in 3D is fulfilled according to the results of the orbit comparisons between the different orbit solutions from the QWG.

Item URL in elib:https://elib.dlr.de/113653/
Document Type:Article
Title:Sentinel-1A - First precise orbit determination results
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Peter, HeikePosiTim UGUNSPECIFIED
Jäggi, AdrianaiubUNSPECIFIED
Fernández, JaimeGMV ADUNSPECIFIED
Escobar, DiegoGMV ADUNSPECIFIED
Ayuga, F.GMV ADUNSPECIFIED
Arnold, DanielaiubUNSPECIFIED
Wermuth, Martinmartin.wermuth (at) dlr.deUNSPECIFIED
Hackel, Stefanstefan.hackel (at) dlr.deUNSPECIFIED
Otten, MichielESA/ESOCUNSPECIFIED
Simons, Wimtu delftUNSPECIFIED
Visser, Pietertu delftUNSPECIFIED
Hugentobler, UrstumUNSPECIFIED
Féménias, PierreESA/ESRINUNSPECIFIED
Date:1 September 2017
Journal or Publication Title:Advances in Space Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:60
DOI :10.1016/j.asr.2017.05.034
Page Range:pp. 879-892
Publisher:Elsevier
ISSN:0273-1177
Status:Published
Keywords:Copernicus Sentinel-1 Precise orbit determination GPS Phase center variations Orbit validation
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: Wermuth, Martin
Deposited On:10 Aug 2017 09:39
Last Modified:06 Sep 2019 15:27

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