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Attitude Control on TET-1 - Experiences from the First Year of Operations

Hobsch, Markus and Cossavella, Fabiana and Löw, Sebastian and Herman, Jacobus (2014) Attitude Control on TET-1 - Experiences from the First Year of Operations. In: 13th International Conference on Space Operations. SpaceOps 2014 - 13th International Conference on Space Operations, 2014-05-05 - 2014-05-09, Pasadena, California, USA. doi: 10.2514/MSPOPS14. ISBN 978-1-62410-221-9.

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Official URL: http://arc.aiaa.org/doi/book/10.2514/MSPOPS14


The micro-satellite TET-1 carries several technology experiments. It is the first in a series offering the possibility of in-orbit verification of new equipment made in Germany by the industrial and scientific aerospace community. TET-1 was launched 22nd July 2012 and is operated by the German Space Operations Center. Attitude and attitude control is influenced by several of the experiments. Special attitude control modes are required for a number of experiments in order to point the satellite in a prescribed direction or to a specific location on Earth. These comprise an experiment with three infra-red cameras, a pico thruster and finally a new type S-band transponder. The Li Polymer battery was not expected to have any effect on attitude control. However, it was discovered that charging and discharging the battery disturbs the magnetic field sensors, thus a different approach to attitude control is required when it is in use. implementation of and special demands on the attitude control system for these experiments will be presented. The mission is experimental with high demands on the attitude control system. The envisaged duration was one year only with a possible prolongation of a further year. Components were therefore not chosen for longevity. however, the actual amount of disruptions due to sensor and/or actuator outages and due to idiosyncrasies in the spacecrafts thermal budget was higher than expected. The ensuing challenges for the attitude control system will be discussed. A software upload in May 2013 mitigated several of the issues addressed above. The improvements in the software and autonomous on-board reactions will be presented in the final Section together with some recommendations for the follow-on missions TET-2 and BIROS.

Item URL in elib:https://elib.dlr.de/93029/
Document Type:Conference or Workshop Item (Speech)
Title:Attitude Control on TET-1 - Experiences from the First Year of Operations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:5 May 2014
Journal or Publication Title:13th International Conference on Space Operations
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:TET AOCS attitude control system space operations biros firebird reaction wheel experience failure magnetic field sensor inertial measurement unit
Event Title:SpaceOps 2014 - 13th International Conference on Space Operations
Event Location:Pasadena, California, USA
Event Type:international Conference
Event Start Date:5 May 2014
Event End Date:9 May 2014
Organizer:NASA Jet Propulsion Laboratory
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Raumflugbetrieb / Kontrollzentrums-Technologie (old), R - Projekt FireBIRD (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training > Mission Operations
Deposited By: Hobsch, Markus
Deposited On:05 Dec 2014 09:27
Last Modified:24 Apr 2024 19:58

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