Optimal satellite attitude control: A geometric approach

Nadjim Horri, Phil Palmer

    Research output: Contribution to conferencePaperpeer-review

    12 Citations (Scopus)


    Optimal nonlinear control remains one of the most challenging subjects in control theory despite a long research history. In this paper, we present a geometric optimal control approach, which circumvents the tedious task of numerically solving online the Hamilton Jacobi Bellman (HJB) partial differential equation, which represents the dynamic programming formulation of the nonlinear global optimal control problem. Our approach makes implementation of nonlinear optimal attitude control practically feasible with low computational demand onboard a satellite. Optimal stabilizing state feedbacks are obtained from the construction of a Control Lyapunov function. Based on a phase space analysis, two natural dual optimal control objectives are considered to illustrate the application of this approach to satellite attitude control: Minimizing the norm of the control torque subject to a constraint on the convergence rate of a Lyapunov function, then maximizing the convergence rate of a Lyapunov function subject to a constraint on the control torque. Both approaches provide ease of implementation and achieve robust optimal trade-offs between attitude control rapidity and torque expenditure, without computational issues.
    Original languageEnglish
    Publication statusPublished - 2009
    Event2009 IEEE Aerospace Conference - Montana, Big Sky, United States
    Duration: 7 Mar 200914 Mar 2009


    Conference2009 IEEE Aerospace Conference
    Country/TerritoryUnited States
    CityBig Sky
    Internet address


    • Satellites
    • Optimal control
    • Lyapunov method
    • Torque control
    • Convergence
    • Control theory
    • History
    • Jacobian matrices
    • Partial differential equations
    • Dynamic programming

    ASJC Scopus subject areas

    • Aerospace Engineering


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