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Enhanced estimation of neutral thermospheric densities with MICROSCOPE

List, M. und Bremer, Stefanie und Rievers, B. und Selig, H. (2018) Enhanced estimation of neutral thermospheric densities with MICROSCOPE. In: Proceedings of the International Astronautical Congress, IAC. 69th International Astronautical Congress, 2018-10-01 - 2018-10-05, Bremen, Germany.

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Kurzfassung

After more than 15 years of planning, developing, building, and testing, the French MICROSCOPE satellite was finally launched on 25th of April 2016. It is the first satellite testing the validity of the Weak Equivalence Principle up to an accuracy of the Eötvös parameter eta of 1E-15. The payload comprises two differential accelerometers, each containing two test masses. Due to the drag-free system non-gravitational disturbances are cancelled thus allowing the test masses to follow a pure gravitational orbit. An initial evaluation of the first science data has already led to an improvement of the determination of the Eötvös parameter eta by one order of magnitude compared to the best values achieved by torsion balance experiments. However, for calibration purposes and for identifying residual couplings between test mass motion and external perturbations, simulations of the satellite system and the mission are necessary. We present our approach of a high precision analysis of the non-gravitational perturbations acting on MICROSCOPE by means of the High Performance satellite dynamics Simulator (HPS). This simulation tool is being developed by the Center of Applied Space Technology and Microgravity (ZARM) at the University of Bremen, Germany, in cooperation with the Institute of Space Systems of the German Aerospace Center. Here the calculation of the non-gravitational effects includes the specifics of spacecraft geometry and illumination conditions thus allowing for highest modeling accuracy. Furthermore, we introduce an application for MICROSCOPE which can be used for any spacecraft employing high performance accelerometers to conduct aeronomy experiments. By accurately modeling all non-gravitational effects we achieve subsequent estimates of all accelerations acting on the craft. When the satellite is operated in non-drag free mode and other dynamical effects derived from the rotational behaviour are known, we can subtract these estimated values from the accelerometer signal. By means of a fit of the atmospheric density parameter in the available drag model with respect to the residual acceleration we will improve the estimation on the thermospheric density. We will show details of the procedure as well as an application for the MICROSCOPE satellite after its primary science phase.

elib-URL des Eintrags:https://elib.dlr.de/126676/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Enhanced estimation of neutral thermospheric densities with MICROSCOPE
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
List, M.ZARM, Univ. Bremenhttps://orcid.org/0000-0002-5268-5633NICHT SPEZIFIZIERT
Bremer, StefanieStefanie.Bremer (at) dlr.dehttps://orcid.org/0000-0002-8091-0121NICHT SPEZIFIZIERT
Rievers, B.ZARM, Univ. Bremenhttps://orcid.org/0000-0003-4231-9362NICHT SPEZIFIZIERT
Selig, H.GERADTS GmbHNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:1 Oktober 2018
Erschienen in:Proceedings of the International Astronautical Congress, IAC
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:MICROSCOPE, aeronomy
Veranstaltungstitel:69th International Astronautical Congress
Veranstaltungsort:Bremen, Germany
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:1 Oktober 2018
Veranstaltungsende:5 Oktober 2018
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:keine Zuordnung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R - keine Zuordnung
DLR - Teilgebiet (Projekt, Vorhaben):R - keine Zuordnung
Standort: Bremen
Institute & Einrichtungen:Institut für Raumfahrtsysteme > Navigations- und Regelungssysteme
Hinterlegt von: Bremer, Dr.-Ing. Stefanie
Hinterlegt am:05 Mär 2019 10:36
Letzte Änderung:24 Apr 2024 20:30

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