article · International Journal of Robust and Nonlinear Control
This research addresses the challenge of stabilizing spacecraft attitude under difficult operating conditions, including limited communication bandwidth, model uncertainties, external disturbances, actuator faults, and saturated inputs. To tackle these issues, a novel attitude control framework integrates an event-triggered mechanism with a finite-time disturbance observer. This observer estimates combined system disturbances rapidly without needing prior knowledge of their upper limits, while the event-triggered approach reduces demands on the wireless control network. The design also resolves unwinding issues linked to quaternion-based attitude models and prevents Zeno behaviour. Stability analysis proves that system trajectories achieve uniformly ultimately bounded convergence. Numerical simulations confirm that the approach delivers improved convergence time, steady-state accuracy, lower control update rates, and reduced energy consumption compared to conventional alternatives.
Spacecraft must maintain precise orientation even when facing equipment faults, space disturbances, and limited onboard computing or communication bandwidth. By updating control commands only when necessary and rapidly compensating for unexpected forces, this method ensures reliable spacecraft orientation. It also conserves vital onboard energy and network resources, enhancing overall operational resilience.
This work is relevant to satellite manufacturers, space agencies, and aerospace control systems engineers seeking robust attitude control under constrained communication networks. Because the findings are validated solely through numerical simulation and comparative analysis, the technology remains at an early stage of research and would require physical testing on hardware or in-orbit demonstration before deployment in operational spacecraft.
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Abstract This paper investigates the attitude stabilization problem for a bandwidth‐constrained spacecraft subjected to model uncertainty, external disturbances, actuator faults, and saturated input. The proposed attitude controller is developed by combining the disturbance observer with an event‐trigger technique to provide disturbance attenuation meanwhile respecting the constraint on the wireless control network. The proposed disturbance observer estimates the lumped disturbance within a finite time, and its output is then fed to the composite control law. The presented control scheme relaxes the use of a priori upper bound knowledge of disturbance and resolves the unwinding problem in the quaternion‐based attitude representation. The closed‐loop stability analysis under the proposed algorithm shows the uniformly ultimately bounded convergence of state trajectories. Moreover, the designed event trigger approach avoids the Zeno behavior. The numerical simulation with comparative analysis illustrates the efficacy of the proposed controller in terms of convergence time, steady‐state bound, rate of control update, and energy consumption.
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DOI: 10.1002/rnc.6573
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