Robust adaptive control for spacecraft attitude synchronization subject to external disturbances: A performance adjustable event‐triggered mechanism

Abstract

Summary This article addresses the leader‐following synchronization problem of multiple rigid spacecraft systems affected by external disturbances with the directed topology. An event‐triggered distributed observer is proposed to estimate the leader's state. By integrating a performance adjustable function (PAF) into the event‐triggered mechanism, the sampling frequency and estimation speed can be adjusted. Based on the event‐triggered distributed observer, an adaptive event‐triggered control scheme is proposed to aganist the external disturbances. With the adaptive event‐triggered control scheme, continuous communication between spacecraft is no longer required and Zeno‐free property can be guaranteed. The effectiveness of the theoretical results is verified by a numerous example.

Simple robust PD control for asymptotic stabilization of uncertain spacecraft with actuator constraints and disturbances

“…Remark As observation and explanations of References 12 and 19–21, these properties and assumption are quite common in the framework of robust control of spacecraft 24–26 . In practice, the external disturbances in space such as gravity gradient torque, aerodynamic torque, solar pressure torque, and magnetic torque are reasonable upper bounded 12,20 …”

“…The main drawback of these SPD controls is that they cannot compensate the external disturbance, which always exist in the operation of spacecraft 19–21 . It is well known that extension the well‐designed saturated control for perturbation‐free systems to the linear systems with bounded disturbance is not straightforward 22,23 .…”

“…18 The main drawback of these SPD controls is that they cannot compensate the external disturbance, which always exist in the operation of spacecraft. [19][20][21] It is well known that extension the well-designed saturated control for perturbation-free systems to the linear systems with bounded disturbance is not straightforward. 22,23 The nonlinear dynamics of spacecraft make the problem of control design for spacecraft with actuator constraints and external disturbances more challenging.…”

Performance‐adjustable PPC policies for spacecraft attitude‐orbit coupled tracking under event‐triggered sampling

“…Moreover, in the process of performing the task of the independent spacecraft, the sampling performance (including actuator update frequency and communication network data transfer rate) and computing performance are also particularly important to ensure the efficiency and real-time nature of the system. Event-triggered control 12,13 is an aperiodic sampled-data control strategy, which determines the sampling time by triggering conditions. The mechanism remarkably reduces system resource usage to cope with resource-constrained processing systems.…”