Rüddenklau, René und Peev, Eltimir und Moll, Florian (2022) Development of a cascaded fine pointing and tracking control loop for quantum key distribution via free-space optical communications. In: Environmental Effects on Light Propagation and Adaptive Systems V 2022 (12266). SPIE. Proceedings Volume 12266, Environmental Effects on Light Propagation and Adaptive Systems V, 2022-09-05 - 2022-09-07, Berlin, Deutschland. doi: 10.1117/12.2636111. ISBN 978-151065535-5. ISSN 0277-786X.
PDF
1MB |
Kurzfassung
Satellite based quantum key distribution (QKD) enables the delivery of keys for quantum secure communications over long distances. Maturity of the technology as well as industrial interest are ever increasing. Same is true for satellite free-space optical communications (FSOC). In order to enable a robust channel for transmission it is indispensable to account for static and dynamically changing misalignments between the transmitter and receiver pair. This work will focus on the transmitter terminal (Alice) and the design and verification process of the active beam steering system. The novelty is a recently developed variable reluctance fine steering mirror (FSM) including eddy current sensors (ECS) to measure its tip and tilt. A cascaded architecture was chosen in order to combine the optical stabilization objective with the dynamics of the mirror platform. The inner control loop makes use of an observer model whose estimated output is fed into a state controller allowing for an increased responsiveness. While high gains increase the closed loop bandwidth the eigenfrequency of the system introduces a pole to the plant which has to be avoided by the controller output. A digital notch filter was introduced to reject the excitation of the critical frequency band which gets obsolete in a system with high frequency sampling capabilities. The outer loop is engaged when a valid optical signal is received and a transition from a closed loop pointing to a closed loop tracking mode is performed. A proportional-integral (PI) controller keeps the received beam at the 4-quadrant-diode (4QD) whose center is used as the main reference through prior calibration with the transmit beam launching on the same path. The presented cascaded control scheme allows improvements in system performance and reliability.
elib-URL des Eintrags: | https://elib.dlr.de/187959/ | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||
Zusätzliche Informationen: | The project on which this report is based was funded by the German Federal Ministry of Education and Research under the funding code 16KIS1079. The author is responsible for the content of this publication. | ||||||||||||||||
Titel: | Development of a cascaded fine pointing and tracking control loop for quantum key distribution via free-space optical communications | ||||||||||||||||
Autoren: |
| ||||||||||||||||
Datum: | 22 Oktober 2022 | ||||||||||||||||
Erschienen in: | Environmental Effects on Light Propagation and Adaptive Systems V 2022 | ||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||
Open Access: | Ja | ||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||
DOI: | 10.1117/12.2636111 | ||||||||||||||||
Verlag: | SPIE | ||||||||||||||||
Name der Reihe: | Proceedings of SPIE | ||||||||||||||||
ISSN: | 0277-786X | ||||||||||||||||
ISBN: | 978-151065535-5 | ||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||
Stichwörter: | free-space optical communications, tracking, fine pointing, cascaded control loop, fine steering mirror, quantum key distribution | ||||||||||||||||
Veranstaltungstitel: | Proceedings Volume 12266, Environmental Effects on Light Propagation and Adaptive Systems V | ||||||||||||||||
Veranstaltungsort: | Berlin, Deutschland | ||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||
Veranstaltungsbeginn: | 5 September 2022 | ||||||||||||||||
Veranstaltungsende: | 7 September 2022 | ||||||||||||||||
Veranstalter : | SPIE | ||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||
HGF - Programm: | Raumfahrt | ||||||||||||||||
HGF - Programmthema: | Kommunikation, Navigation, Quantentechnologien | ||||||||||||||||
DLR - Schwerpunkt: | Raumfahrt | ||||||||||||||||
DLR - Forschungsgebiet: | R KNQ - Kommunikation, Navigation, Quantentechnologie | ||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | R - Project PROSIRIS | ||||||||||||||||
Standort: | Oberpfaffenhofen | ||||||||||||||||
Institute & Einrichtungen: | Institut für Kommunikation und Navigation > Optische Satellitenlinks | ||||||||||||||||
Hinterlegt von: | Rüddenklau, René | ||||||||||||||||
Hinterlegt am: | 09 Nov 2022 15:25 | ||||||||||||||||
Letzte Änderung: | 24 Apr 2024 20:49 |
Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags