Dual-quaternion-based satellite pose estimation and control with event-triggered data transmission

This paper proposes an event-triggered active disturbance rejection control framework to achieve the simultaneous position and attitude control of a satellite in proximity operations. Firstly, to facilitate the satellite motion description, we derive the relative kinematics and dynamics in terms of dual quaternions with the considerations of internal uncertainties and external disturbances. Then, two kinds of event-triggered mechanisms in the sensor/observer and controller/actuator channels are proposed to reduce the utilization of onboard communication resources and to improve control performance, respectively. The observation error and tracking error of both the attitude and orbit systems are theoretically proven to be asymptotically bounded. Finally, the simulation results show that the proposed method can achieve simultaneous position and attitude tracking between target and chaser satellites with satisfactory control performance and reduced communication rates.