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Automated design and validation of acquisition patterns for optical inter-CubeSat links

Rüddenklau, René und Rosano Nonay, Jorge und Schitter, Georg (2024) Automated design and validation of acquisition patterns for optical inter-CubeSat links. In: Proceedings of the Small Satellite Conference. Small Satellite Conference 2024, 2024-08-02 - 2024-08-08, Logan, Utah, USA.

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Kurzfassung

Commercially available CubeSats with volumes of up to six units cannot achieve the precision required for an instantaneous establishment of a low-divergence optical inter-satellite link employing solely their attitude-determination and control system. Those residual attitude errors are present due to vibrations and limited control precision caused by the commonly used reaction wheel actuators. Thus, search patterns are used to scan the remaining field of uncertainty in order to achieve an optical inter-satellite. This work focuses on the development of an automated procedure to optimize the interaction between each of the individual search patterns. The performance of the two combined patterns is measured by their mean acquisition time and probability of success based on a Monte-Carlo simulation. Four patterns – Spiral, Rose, Lissajous and Grid – are considered and modified according to the optical inter-satellite link scenario between two CubeISL laser communication terminals. They are distinguished by their respective tasks within the acquisition scheme. The terminal for pointing, acquisition and tracking (T-PAT) scans the field of uncertainty in order to establish the link. The terminal for detection, adjustment and tracking (T-DAT) scans for a hit on its optical detector with a matched pattern period. It then gradually compensates for the remaining error until both terminals can switch to active tracking mode. The proposed acquisition scheme and generated patterns were verified in a campaign over 334 m link distance. To achieve a controllable test environment, both CubeISL terminals and attitude manipulation actuators were automated. This approach offers the advantage of repeatable parameter variations and a higher number of tests that can be carried out. Each run takes approximately 10 minutes, which emulates the envisaged runtime in space, including the configuration of the terminals and supporting equipment. Additionally, all configurations are executed multiple times to evaluate the standard deviation of individual tests. The presented procedure demonstrates that simulations can exclude a significant number of design parameter combinations. The remaining pattern sets are implemented for final optimization during a field-test with the actual hardware of the optical terminals. As both CubeSats will operate in space without real-time supervision, the same validation process can be applied during commissioning. Therefore, the proposed automated design and validation procedure reduces the time required for supervised measurement campaigns while increasing confidence in the reliability of the overall system for remote on-orbit operation.

elib-URL des Eintrags:https://elib.dlr.de/205978/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Automated design and validation of acquisition patterns for optical inter-CubeSat links
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Rüddenklau, RenéRene.Rueddenklau (at) dlr.dehttps://orcid.org/0000-0003-2876-8591167674684
Rosano Nonay, JorgeJorge.RosanoNonay (at) dlr.dehttps://orcid.org/0009-0007-7306-9315167674685
Schitter, GeorgSchitter (at) acin.tuwien.ac.atNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2024
Erschienen in:Proceedings of the Small Satellite Conference
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Free-Space optical communications, Acquisition, Optimization, Spiral, Rose, Lissajous, Search pattern, CubeSat, CubeISL
Veranstaltungstitel:Small Satellite Conference 2024
Veranstaltungsort:Logan, Utah, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:2 August 2024
Veranstaltungsende:8 August 2024
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 - Projekt CubeISL In Orbit-Demonstration
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Kommunikation und Navigation > Optische Satellitenlinks
Hinterlegt von: Rüddenklau, René
Hinterlegt am:17 Sep 2024 17:07
Letzte Änderung:17 Sep 2024 17:07

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