Synchronized Attitude Control for Satellite with Uncertain Disturbances

A synchronized attitude control method for satellite with uncertain disturbances is proposed in this paper. Different from the traditional finite time control method, the proposed method based on time-synchronized control technique which can achieve time simultaneous convergence performance of all controlled attitudes. Firstly, the attitude dynamic system is transformed into error system in strict feedback form, and the synchronized attitude control method based on norm- normalized function is applied. Considering the disturbance torques encountered in the system, the multi-variable supertwisting disturbance observer is constructed to estimate the disturbances and inserted into the control law in order to strengthen the robustness of the closed-loop system. Finally, the numerical simulations are given to validate the effectiveness of the proposed method.