IAC-17.C1.1.6: Magnetic attitude control of satellites using coarse pulse-width-modulation of magnetorquers

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

1 被引用数 (Scopus)

抄録

Magnetorquers enable energy efficient attitude control of microsatellites in low Earth orbits. The challenging problem for the magnetic attitude control is the limitations on their component capability, and high-frequency Pulse- Width-Modulation (PWM) actuations are difficult to implement. Moreover since the magnetorquers generate control torques into a plane orthogonal to the geomagnetic field, three-axis attitude control using only the magnetorquers is challenging. In this context, this study deals with the magnetic attitude control of satellites using only magnetorquers that are driven with coarse PWM. The coarse PWM actuations in this study mean that the magnetorquers are successively actuated by on-state and then off-state in each actuation cycle of a few seconds. The difficulties of the coarse PWM actuations stem from the followings: 1) Conventional techniques for feedback controllers are hard to be applied because the magnitude of the magnetic moment is constant. 2) The dynamics of the satellite has nonlinear terms in control torques due to coarse PWM actuations. First, the dynamics of the satellite with on-off inputs are formulated as a discrete system in order to deal with the coarse PWM actuations of the magnetorquers. Then, to tackle with the nonlinearity of the control torques, averaging method for general case is used for reducing to the problem that is dynamic quantizer is applicable. As a preliminary study, dynamic quantizer is designed for satellites in sun-synchronous orbits and is verified for the coarse input system.

本文言語英語
ホスト出版物のタイトル68th International Astronautical Congress, IAC 2017
ホスト出版物のサブタイトルUnlocking Imagination, Fostering Innovation and Strengthening Security
出版社International Astronautical Federation, IAF
ページ6840-6844
ページ数5
ISBN(印刷版)9781510855373
出版ステータス出版済み - 1 1 2017
外部発表はい
イベント68th International Astronautical Congress: Unlocking Imagination, Fostering Innovation and Strengthening Security, IAC 2017 - Adelaide, オーストラリア
継続期間: 9 25 20179 29 2017

出版物シリーズ

名前Proceedings of the International Astronautical Congress, IAC
10
ISSN(印刷版)0074-1795

その他

その他68th International Astronautical Congress: Unlocking Imagination, Fostering Innovation and Strengthening Security, IAC 2017
国/地域オーストラリア
CityAdelaide
Period9/25/179/29/17

All Science Journal Classification (ASJC) codes

  • 航空宇宙工学
  • 天文学と天体物理学
  • 宇宙惑星科学

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