Event‐triggered anti‐disturbance attitude control for rigid spacecrafts with multiple disturbances

Abstract

This article is devoted to the problem of attitude control for rigid spacecraft subject to multiple disturbances. Due to the limited communication and storage resource, an event-triggered anti-disturbance attitude control approach is proposed for the attitude control system (ACS) with multiple disturbances. Different from some existing event-triggered attitude control methods, the multiple disturbances are considered and can be divided into an uncertain modeled disturbance and a norm bounded equivalent disturbance. A disturbance observer is designed to estimate the modeled disturbance. Based on the framework of disturbance observer-based control, the proposed event-triggered anti-disturbance controller can guarantee that the ACS converges toward a small invariant set, which successfully avoids continuous communication and Zeno phenomenon. Finally, simulation results are given to demonstrate the efficiency of the proposed approach.

Periodic event‐triggered control with multisource disturbances and quantized states

“…where i , i = 1, 2, 3 are positive constants. Suppose system (27) admits a solution by selecting an allowable T such that (T) ≤ 1 2 , then one can obtain…”

“…ETC has been developed for these two types of disturbances. [27][28][29][30] For deterministic disturbances, a PET output feedback control problem with deterministic time-varying disturbances was investigated in the work of Yang et al 28 For stochastic disturbances, Li et al 30 developed a PET control scheme for continuous-time stochastic systems. In general, it is difficult to predict the behavior of a system with stochastic disturbances.…”

Fully distributed event‐triggered asymptotic attitude coordination of multiple spacecraft systems with disturbances

“…3,32 Reaction wheels, as one of the typical actuators of the attitude control system, will also generate vibration disturbance during the high-speed rotation. 33 At the current stage, some remarkable results have applied the adaptive control techniques to the distributed coordination scheme designs to compensate for complex nonlinear dynamics or suppress disturbances. 16,34,35 As to dealing with aforementioned disturbances with periodic characteristics, the disturbance rejection ideology can make full use of disturbances' dynamic information and is possible to achieve even asymptotic tracking performance without arousing actuator's chattering phenomenon.…”

On event‐triggered nonsmooth attitude tracking controller for a rigid spacecraft

“…In the literature, according to the difference in the sampled‐data mechanism, the design of digital controllers is usually divided into two categories, namely, a traditional periodic or time‐triggered control that samples signals at equidistant time intervals, a recent popular aperiodic or event‐triggered control 29 that samples signals at aperiodic time intervals determined by an event‐triggered mechanism. Compared with the periodic or time‐triggered sampled‐data control, the major superiority of event‐based sampled‐data control is that high‐efficiency resource utilization, which reduces unnecessary computing or communication of the control signal in the case when system performance is satisfactory 30,31 . A new control action is taken only when measurement signal has deviated sufficiently enough, that is the presetting event is triggered.…”