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This paper presents a solution for rest-to-rest attitude reorientation for a rigid body under angular velocity constraints and external disturbances. Assuming that external disturbances are unknown but bounded, the sliding mode technique is used in attitude controller to reject disturbances. Then, a potential function in terms of sliding vector is proposed with a largest potential placing at the maximal...
This brief addresses attitude tracking problems for an over-actuated spacecraft in the presence of actuator faults, imprecise fault estimation, and external disturbances. First, a model reference adaptive control technique is used to design a high-level controller to produce the three-axis virtual control torque. Then, taking fault estimation uncertainties into account, a robust control allocation...
Repeating ground track orbit is useful for satellite to detect the changes of the interested area with identical viewing conditions repetitively. The attitude control system for this kind of mission is a repetitively-operated dynamic system. An anticipatory iterative learning control (ILC) scheme is proposed to improve the attitude control accuracy for the above attitude control mission. Simulation...
This paper addresses a decentralized quaternion-based controller for attitude tracking synchronization in spacecraft formation, without angular velocity measurements. Passivity approach is deployed to remove the requirements for absolute angular velocity measurements and relative angular velocity measurements between neighboring spacecrafts. The proposed control law guarantees that each spacecraft...
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