Output Feedback Control for Spacecraft Attitude System with Practical Predefined-Time Stability Based on Anti-Windup Compensator

Abstract

This paper investigates the problem of output feedback attitude control for rigid spacecraft subject to inertia matrix uncertainty, space disturbance, and input saturation. Firstly, a model transformation is adopted to convert an attitude system with immeasurable angular velocity into a new system. All states of the new converted system are measurable and available for feedback; however, the system contains mismatched uncertainty resulting from the coordinate transformation. Then, an adaptive nonsingular back-stepping control with practical predefined-time convergence is designed. To resolve the problem of input saturation, an anti-windup compensator is developed. It is analytically proved that the spacecraft attitude and angular velocity are practical predefined-time stable, such that the convergence time is a given tunable constant. The simulation results reveal that the proposed control framework provides rapid attitude maneuver and actuator saturation elimination.

Finite-Time Fuzzy Fault-Tolerant Control for Nonlinear Flexible Spacecraft System with Stochastic Actuator Faults

“…Define y(t) = e 0.5 ατ(t) . Since 1 ≤ y(t) ≤ e 0.5ατ M , if the matrices Ω ij (1) and Ω ij (e 0.5ατ M ) satisfy the conditions ( 18) and ( 19), one has…”

“…In recent years, the quest to stabilize flexible spacecraft has intensified, sparked by their advantages for space missions and evidenced by substantial research (e.g., [1,2]). These spacecraft exhibit complex dynamics, with a mix of flexible and rigid behaviors, and the critical system parameters that influence these dynamics are often hard to measure precisely.…”

Nonlinear Filter-Based Adaptive Output-Feedback Control for Uncertain Fractional-Order Nonlinear Systems with Unknown External Disturbance

“…In order to model the nonlinear system with unmeasurable states more accurately, the authors in [31] first proposed an adaptive fuzzy output-feedback control scheme for a nonlinear system by constructing a fuzzy nonlinear state observer. Further, the output feedback control method is widely used in practical engineering systems, like active suspension systems [32], unmanned aerial vehicles [33], spacecraft attitude systems [34], etc. It is worth noting that the abovementioned output-feedback results are only applicable to integer-order nonlinear systems.…”