Attitude determination and control of LEO microsatellites

The Attitude Determination and Control System algorithm and code have been developed and tested for the possible use in the proposed X-Sat, a LEO microsatellite of NTU. The X-Sat is currently under development and is expected to be launched in 2005 into a circular orbit at a height of 800km. An Equa...

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Main Author: Wee, Melisa Toon Cheng.
Other Authors: Arichandran, K.
Format: Theses and Dissertations
Published: 2008
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Online Access:http://hdl.handle.net/10356/3724
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-37242023-07-04T15:08:00Z Attitude determination and control of LEO microsatellites Wee, Melisa Toon Cheng. Arichandran, K. School of Electrical and Electronic Engineering Sundararajan, Narasinhan DRNTU::Engineering::Electrical and electronic engineering::Satellite telecommunication The Attitude Determination and Control System algorithm and code have been developed and tested for the possible use in the proposed X-Sat, a LEO microsatellite of NTU. The X-Sat is currently under development and is expected to be launched in 2005 into a circular orbit at a height of 800km. An Equatorial orbit is preferred, though varying inclined orbits have been examined in this research. A combination of a 3-axis magnetometer, a Sun sensor and two Earth Horizon sensors are used for attitude determination. As for the actuators, magnetic torquers and reaction wheels are used during different operational phases. Exploration on the ability of fine pointing and large angular slew manoeuvre using the reaction wheel controller is one major thrust in this project. This is particularly so as imaging is likely to be one of the main objectives of X-Sat. The effect of different perturbation torques on the proposed satellite are studied. The simulation results show good convergence in attitude to about 5° pointing accuracy when using magnetometer measurements and 0.2° for Sun and Earth Horizon measurements. Finally, embedding the software onto a digital signal processor (DSP), TMS320C31, is considered. This provides a better understanding of the real-time dynamics and would lead to the development of the ADCS onboard X-Sat. Master of Engineering 2008-09-17T09:36:04Z 2008-09-17T09:36:04Z 2000 2000 Thesis http://hdl.handle.net/10356/3724 Nanyang Technological University application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
topic DRNTU::Engineering::Electrical and electronic engineering::Satellite telecommunication
spellingShingle DRNTU::Engineering::Electrical and electronic engineering::Satellite telecommunication
Wee, Melisa Toon Cheng.
Attitude determination and control of LEO microsatellites
description The Attitude Determination and Control System algorithm and code have been developed and tested for the possible use in the proposed X-Sat, a LEO microsatellite of NTU. The X-Sat is currently under development and is expected to be launched in 2005 into a circular orbit at a height of 800km. An Equatorial orbit is preferred, though varying inclined orbits have been examined in this research. A combination of a 3-axis magnetometer, a Sun sensor and two Earth Horizon sensors are used for attitude determination. As for the actuators, magnetic torquers and reaction wheels are used during different operational phases. Exploration on the ability of fine pointing and large angular slew manoeuvre using the reaction wheel controller is one major thrust in this project. This is particularly so as imaging is likely to be one of the main objectives of X-Sat. The effect of different perturbation torques on the proposed satellite are studied. The simulation results show good convergence in attitude to about 5° pointing accuracy when using magnetometer measurements and 0.2° for Sun and Earth Horizon measurements. Finally, embedding the software onto a digital signal processor (DSP), TMS320C31, is considered. This provides a better understanding of the real-time dynamics and would lead to the development of the ADCS onboard X-Sat.
author2 Arichandran, K.
author_facet Arichandran, K.
Wee, Melisa Toon Cheng.
format Theses and Dissertations
author Wee, Melisa Toon Cheng.
author_sort Wee, Melisa Toon Cheng.
title Attitude determination and control of LEO microsatellites
title_short Attitude determination and control of LEO microsatellites
title_full Attitude determination and control of LEO microsatellites
title_fullStr Attitude determination and control of LEO microsatellites
title_full_unstemmed Attitude determination and control of LEO microsatellites
title_sort attitude determination and control of leo microsatellites
publishDate 2008
url http://hdl.handle.net/10356/3724
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