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- Neagu, Catalin-Daniel, et al.
(författare)
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Design Drivers of an Attitude Control System for Small CubeSats Using Magnetorquers
- 2022
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Ingår i: IAC 2022 Congress Proceedings, 73rd International Astronautical Congress (IAC). - : International Astronautical Federation, IAF.
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Konferensbidrag (refereegranskat)abstract
- Attitude control in the case of 1U CubeSats is a crucial design choice in any mission of such scale. This leads to extensive studies being conducted before deciding on the architecture of this subsystem. In the case of Luleå University Technology's first student-led CubeSat project, Atmospheric Polar Transmission Alignment Satellite (APTAS), the driving design choices of the Attitude Determination and Control System (ADCS) were predominately impacted by its onboard payload requirements. For successful operations of the camera, the ADCS must ensure a stability of less than 0.58 deg/s, while the pointing accuracy for both camera and EISCAT antenna system shall be less than 10 deg. In this regard, following a study of suitable hardware designs that would fulfill those requirements, the satellite shall be equipped with magnetometers, coarse sun sensors (CSS) and a gyroscope. It is widely-known that ADCS-related tasks are notoriously computationally heavy. This presents another limitation of 1U satellites: available computational load. Preliminary studies and simulation have shown that an usual algorithm in the form of a Kalman Filter (or similar applications) would interfere with payload operations due to subsequent sensor-fusion iterations and the heavy computational load resulting from it. For this reason, the TRIAD attitude determination method was deemed a fitting alternative, due to its computational efficiency and lower number of operations. All data-processing tasks must also be conducted through the one on-board computer, due to the volume constraints of 1U. In terms of control, the conducted simulations show that the B-dot algorithm for detumbling motion and the quaternion feedback control for nadir pointing are capable of meeting the requirements of the mission. For optimal payload operations, four operation modes have been defined, each to be functional at different stages of the satellite's mission. Each mode utilizes a distinct arrangement of ADCS components when needed. Because of the prevalence of 1U CubeSats within the nanosat community, it is necessary to have an efficient ADCS system in order to meet the mission objectives. This paper describes in detail the developed and innovative solution for attitude dynamics of a small CubeSat.
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| 3. |
- Rittatore Texeira, Matias, et al.
(författare)
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Project APTAS – Using CubeSat Design And Development To Bring Students Into Northern Sweden’s Space Ecosystem
- 2021
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Ingår i: IAC 2021 Congress Proceedings, 72nd International Astronautical Congress (IAC), Dubai, United Arab Emirates. - : International Astronautical Federation (IAF).
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Konferensbidrag (refereegranskat)abstract
- The Atmospheric Polar Transmission Alignment Satellite (APTAS), is a project initialized and carried out by students at Luleå University of Technology’s (LTU) northernmost campus located in the Norrbotten region of Sweden, above the Arctic Circle. The entire development process is done in-house by studentswith the support by staff and faculty of the LTU Kiruna Space Campus. The project aims to provide a proof of technology of a 1U CubeSat and strengthen LTU’s position as the Space University of Sweden. APTAS benefits from its proximity to the Swedish Space Institute (IRF), EISCAT and one of the new facilities of EISCAT 3D, as well as Esrange Space Center, which will be equipped in the near future with small satellite launching capabilities. The skills and expertise acquired during the course of this project do, without a doubt, aid the students involved, both in terms of future work in the space industry, and as a boost of confidence in their capabilities. An international team of students with various backgrounds having conceptualized and tested systems pertaining to different disciplines such as telecommunications, mechanical analysis, orbital dynamics, electronics and software development is meant to show and encourage that in combination with appropriate equipment and mentorship, such undertakings can be carried out by a team of university students.
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