elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Kontakt | English
Schriftgröße: [-] Text [+]

First Results from a Hardware-in-the-Loop Demonstration of Closed-Loop Autonomous Formation Flying

Gill, E. und Naasz, B. und Ebinuma, T. (2003) First Results from a Hardware-in-the-Loop Demonstration of Closed-Loop Autonomous Formation Flying. American Astronautical Society. 26th Annual AAS Guidance and Control Conference, Breckenridge, Co., Feb. 5-9 2003.

Dieses Archiv kann nicht den gesamten Text zur Verfügung stellen.

Kurzfassung

A closed-loop system for the demonstration of autonomous satellite formation flying technologies using hardware-in-the-loop has been developed. Making use of a GPS signal simulator with a dual radio frequency outlet, the system includes two GPS space receivers as well as a powerful onboard navigation processor dedicated to the GPS-based guidance, navigation, and control of a satellite formation in real-time. The closed-loop system allows realistic simulations of autonomous formation flying scenarios, enabling research in the fields of tracking and orbit control strategies for a wide range of applications. The autonomous closed-loop formation acquisition and keeping strategy is based on Lyapunov’s direct control method as applied to the standard set of Keplerian elements. This approach not only assures global and asymptotic stability of the control but also maintains valuable physical insight into the applied control vectors. Furthermore, the approach can account for system uncertainties and effectively avoids a computationally expensive solution of the two point boundary problem, which renders the concept particularly attractive for implementation in onboard processors. A guidance law has been developed which strictly separates the relative from the absolute motion, thus avoiding the numerical integration of a target trajectory in the onboard processor. Moreover, upon using precise kinematic relative GPS solutions, a dynamical modeling or filtering is avoided which provides for an efficient implementation of the process on an onboard processor. A sample formation flying scenario has been created aiming at the autonomous transition of a Low Earth Orbit satellite formation from an initial along-track separation of 800 m to a target distance of 100 m. Assuming a low-thrust actuator which may be accommodated on a small satellite, a typical control accuracy of less than 5 m has been achieved which proves the applicability of autonomous formation flying techniques to formations of satellites as close as 50 m.

Dokumentart:Konferenzbeitrag (Paper)
Zusätzliche Informationen: LIDO-Berichtsjahr=2003, monograph_id=AAS 03-040,
Titel:First Results from a Hardware-in-the-Loop Demonstration of Closed-Loop Autonomous Formation Flying
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Gill, E.NICHT SPEZIFIZIERT
Naasz, B.NICHT SPEZIFIZIERT
Ebinuma, T.NICHT SPEZIFIZIERT
Datum:2003
Seitenbereich:Seiten 1-16
Verlag:American Astronautical Society
Status:veröffentlicht
Stichwörter:Formation Flying; GPS
Veranstaltungstitel:26th Annual AAS Guidance and Control Conference, Breckenridge, Co., Feb. 5-9 2003
Veranstalter :AAS
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):NICHT SPEZIFIZIERT
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Raumflugbetrieb und Astronautentraining > Hauptabteilung Raumflugbetrieb und Astronautenausbildung
Hinterlegt von: Karin Klier
Hinterlegt am:16 Sep 2005
Letzte Änderung:14 Jan 2010 17:25

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Copyright © 2008-2013 Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.