Observer-enhanced sliding mode control for fixed-wing aircraft automatic carrier landing
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Xu Peng1, Yan Li1, Zhong Wang1
1School of Automation, Northwestern Polytechnical University, 127 Youyi West Road, Beilin District, Xi'an, Shaanxi, 710072, China.
Abstract:
The automatic carrier landing based on direct lift control (DLC) effectively decouples attitude and trajectory control, but still suffers from slow error convergence and insufficient robustness under unknown time-varying external disturbances. To address these challenges, this paper proposes an observer-enhanced sliding mode control scheme. This scheme accelerates error convergence by designing a non-singular fast integral terminal sliding mode control (NFITSMC), ensuring finite-time convergence of the tracking error. To further enhance disturbance rejection, the super-twisting algorithm is embedded into the observer to form a super-twisting extended state observer (STESO), which estimates unknown time-varying disturbances in real time. Finally, the proposed control algorithm is applied to an automatic carrier landing control system based on direct lift control strategies. Through Lyapunov stability analysis and simulation validation, the system ensures fast error convergence and strong robustness against complex time-varying disturbances, achieving the desired performance within finite time.
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