An exponentially fast attitude tracking controller on the rotation group

James Biggs, Nadjim Horri

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding

    1 Citation (Scopus)

    Abstract

    In this paper a continuous attitude tracking control law is derived directly on the rotation group SO(3). The proposed control law is shown to reduce the closed-loop attitude dynamics to a linear oscillator description of the eigen-axis error, without the need for a small angle approximation. The main practical benefit of this is that the gains can be easily tuned to drive this eigen-axis error to zero exponentially fast and with a damped response without oscillations. The approach uses geodesic error metrics on the rotation group and the angular velocity to construct a Lyapunov function. The time-derivative of this Lyapunov function is control dependent and a continuous control is selected to guarantee asymptotic tracking of the reference motion. Furthermore, the closed-loop system, with this rotation-matrix based feedback control applied, is converted to its quaternion form and further reduced to an eigen-axis error description of the dynamics. This reduction reveals a simple method for tuning the control which involves only one parameter which can be selected to obtain the fastest convergence to the reference motion. However, this control suffers the problem related to the exponential coordinates; the control is not defined globally. This paper shows that by converting the control to quaternions and augmenting the control a globally defined exponentially fast tracking control law can be defined. The proposed control is applied in simulation to the attitude control of a small spacecraft and shows a settling time performance enhancement, for given actuator constraints, compared to a conventional quaternion tracking controller.

    Original languageEnglish
    Title of host publication65th International Astronautical Congress 2014, IAC 2014
    Subtitle of host publicationOur World Needs Space
    PublisherInternational Astronautical Federation, IAF
    Pages4813-4818
    Number of pages6
    Volume7
    ISBN (Electronic)9781634399869
    Publication statusPublished - 1 Jan 2014
    Event65th International Astronautical Congress 2014: Our World Needs Space, IAC 2014 - Toronto, Canada
    Duration: 29 Sep 20143 Oct 2014

    Conference

    Conference65th International Astronautical Congress 2014: Our World Needs Space, IAC 2014
    CountryCanada
    CityToronto
    Period29/09/143/10/14

    ASJC Scopus subject areas

    • Aerospace Engineering
    • Astronomy and Astrophysics
    • Space and Planetary Science

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