Three-Axis L1 Adaptive Attitude Control of Spacecraft Using Solar Radiation Pressure

Document Type

Conference Proceeding


Based on the adaptive control theory, a novel three-axis attitude control system for an axisymmetric spacecraft with uncertain dynamics moving in elliptic orbits, using solar radiation pressure, is derived. The nonaffine-in-control nonlinear spacecraft model includes the gravity gradient torque, the control torque produced by four solar flaps, and external time-varying disturbance moments. For the three-axis attitude control, an adaptive control system is designed, which includes a state predictor. A smooth projection algorithm is used to confine the estimated parameters within a desirable set. In the closed-loop system, the designed adaptive law accomplishes three-dimensional attitude control. A special feature of the attitude control system is that it is possible to select large adaptation gains for fast adaptation and to obtain quantifiable performance bounds. Simulation results show that in the closed-loop system, precise roll, yaw, and pitch angle control is accomplished, despite unmodeled nonlinearities, parameter uncertainty, and external disturbance inputs in the model.


ℒ1 Adaptive attitude control; Elliptic orbit; Multi-axis attitude control; Nonlinear adaptive control; Parameter estimation; Solar radiation pressure


Acoustics, Dynamics, and Controls | Applied Mechanics | Controls and Control Theory | Electrical and Computer Engineering | Electrical and Electronics | Electro-Mechanical Systems | Energy Systems | Engineering | Heat Transfer, Combustion | Mechanical Engineering | Power and Energy | Signal Processing | Systems and Communications


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