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Model Development and Attitude Control for pico-satellite UWE-4
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

UWE-4 is the fourth pico-satellite satellite in UWE series. After the successfullaunch and operation of UWE-3 in 2013, the mission of UWE-4 is to demonstrateelectric propulsion technology for formation flying missions at the pico-satellite levelof miniaturization. The challenge in this project is to demonstrate precise orbit andattitude control given the extremely limited resources available to the satellite. Fourvacuum arc thrusters and one PPU constitute the electric propulsion system.In this master thesis project, attitude control of a cubesat is studied and a simu-lation platform for attitude and orbit control is developed. More than one controlphilosophies are developed, compared and implemented to fly on-board UWE-4. Dif-ficulties with using SGP-4 orbit propagator with low thrust action has motivated thedevelopment of a low fidelity orbit propagator which should be improved further.Insufficient actuation in one axis has motivated the development of a quaternionbased dynamic target attitude solution to achieve precise 2D attitude control whilealso having stabilization in the third axis. Due to the advantages of non-linear con-trol, a sliding mode controller is evaluated against conventional linear PD controllerwith the conclusion that a non-linear controller has some advantages over a linearcontroller for this particular problem of attitude control where constant large anglemaneuvers are desired for changing the orientation of the satellite. Two operationmodes for the thrusters named as the one quadrant and the two quadrant methodare formulated and simulated in different scenarios. It is found out that the twoquadrant method results in a quicker response for the change in orientation of thesatellite.

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Keyword [sv]
URN: urn:nbn:se:ltu:diva-57060Local ID: dc3fbd48-d2de-43b5-a98c-79e314c0edaaOAI: diva2:1030447
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Subject / course
Student thesis, at least 30 credits
Educational program
Space Engineering, master's level
Validerat; 20150121 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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