Adaptive control for attitude synchronisation of spacecraft formation via extended state observer

Abstract

This study studies the problem of synchronisation control for spacecraft formation via extended state observer approach over directed communication topology. The attitude kinematics and dynamics of spacecraft are described by Lagrangian formulations, and the decentralised controller is designed with time-varying external disturbances and unmeasurable velocity information. In particular, the estimation of disturbances obtained via extended state observer is used for the decentralised controller design. A novel Lyapunov function is proposed to show that both static regulation and dynamic synchronisation are realised. Finally, simulation results are given to demonstrate the effectiveness of the controllers proposed in this study.

Consensus for linear agents with unknown parameters

“…Remark 1. Observe that if a protocol exists achieving consensus for the network of combined agents, then the the error between the agents' and the consensus state is asymptotically zero; in the case of nonlinear dynamics (see Qin et al (2014);Yang et al (2015); Cao et al (2015); Yang et al (2014)), only uniform ultimate boundedness of the error is achieved. Remark 2.…”

“…Recently ESOs have been used in consensus problems when dealing with uncertain nonlinearities (see Qin et al (2014);Yang et al (2015)) and disturbances (see Cao et al (2015); Yang et al (2014)). By concentrating on a simpler class (linear dynamics, no disturbances) we show that consensus is achieved exactly and asymptotically, rather than only approximately (i.e.…”

A composite current-constrained control for permanent magnet synchronous motor with time-varying disturbance

“…20 Compared with other observers, the advantages of GPIO can be summarized as follows: (1) it requires the less amount of plant, that is, only the input, output, and system order should be known; (2) the GPIO provides high estimation accuracy in the presence of higher order time-varying disturbances. 21 Because of its excellent characteristics, it is widely used in robots, 22 machine processes, 23 flight control systems, 24 power converters, 25 and so on. From the viewpoint of feedback control design, some feedback control methods can also be used to enhance the disturbance rejection property of the system.…”

Adaptive fault‐tolerant attitude tracking control for spacecraft formation with unknown inertia

“…[1][2][3][4][5][6][7] There have been numerous valuable research studies on attitude control of spacecraft, such as adaptive attitude synchronization control, [8][9][10][11][12] finite-time attitude coordination control, [13][14][15][16] and fast terminal sliding-mode control. [17][18][19][20] Because of fuel consumption and onboard payload working such as rotation of solar arrays, the inertia of spacecraft is time-varying.…”

“…8,13,15,20 Yang et al 8 studied the problem of attitude tracking control for spacecraft formation with external disturbances and designed an adaptive control method to fulfill attitude synchronization under a directed communication topology. Du et al 13 studied the finite-time attitude control problems for multiple spacecraft and proposed a distributed finite-time attitude control law to guarantee the tracking errors to reach a region around the origin with leader-follower architecture.…”