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Design and Implementation of Attitude Control for 3-axes Magnetic Coil Stabilization of a Spacecraft
Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, Department of Engineering Cybernetics.
2011 (English)MasteroppgaveStudent thesis
Abstract [en]
Spacecrafts, especially satellites, play an ever greater role in our daily lives as we increasingly depend on the services they provide, which in turn, more often than not, critically depend on maintaining correct payload attitude. As smaller educational satellites pave the way for organization, group and privately owned pico-satellites, we explore the possibilities of attitude control through magnetic coil actuation. We approach the whole problem, from control theory development to first prototype actualization and control algorithm implementation, presenting the steps taken in a user-friendly manner while pointing out the pitfalls and drawbacks of different solutions. The control is based on a dissipative detumbling controller which after the initial phase is overridden by the reference controller attaining final desired payload attitude. We find that a simple 8-bit, 16Mhz microcontroller unit has the su- cient processing power to continuously compute the geomagnetic field using the complex International Geomagnetic Reference Field model, while simultaneously maintaining correct coil actuation. The power consumed by the controllers during the <300 minute control phase, from initial tumbling to desired attitude, given a typical tumbling velocity of absolute magnitude 0.2[rad/sec], is found to be no more than 150 Joules across the randomly selected test scenarios. Thus we are able to conclude that three perpendicular magnetic coils, together with constantly present disturbances and complex geomagnetic field model preventing it from remaining at an ill-aligned attitude where one actuating degree of freedom is lost, provide sufficient actuation for reference control of a spacecraft.
Place, publisher, year, edition, pages
Institutt for teknisk kybernetikk , 2011. , 144 p.
Keyword [no]
ntnudaim:5920, MTTK teknisk kybernetikk, Reguleringsteknikk
URN: urn:nbn:no:ntnu:diva-13273Local ID: ntnudaim:5920OAI: diva2:436730
Available from: 2011-08-24 Created: 2011-08-24

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