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<p>High-precision laser communication tracking requires strong robustness and fast transient recovery to maintain stable pointing under gust loads, step commands, and abrupt disturbances. This paper develops an improved super-twisting sliding-mode control scheme for the tracking mount of a mobile optical ground station. A nonlinear integral sliding manifold is introduced to eliminate steady-state errors caused by constant matched disturbances while avoiding excessive integral action for large errors. In addition, an error-dependent damping mechanism is embedded to strengthen disturbance rejection when the tracking error is driven away from the origin and to preserve fast response near equilibrium. Experiments on a mobile laser-communication tracking mount under composite conditions (large step commands, wind perturbations, and step disturbances) demonstrate reduced peak tracking error and faster error decay with negligible overshoot compared with a conventional STA baseline. The proposed design provides a practical robust control solution for precision tracking in complex outdoor environments.</p>

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Adaptive super-twisting sliding-mode control for high-precision laser communication tracking systems

  • 期刊论文

  • 发表日期：

    2026年5月9日

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  • Zhanwei Huo,
  • Yiming He,
  • Hongzhi Zhang,
  • Hanghang Wang,
  • Dapeng Tian,
  • Wei Sun

摘要

High-precision laser communication tracking requires strong robustness and fast transient recovery to maintain stable pointing under gust loads, step commands, and abrupt disturbances. This paper develops an improved super-twisting sliding-mode control scheme for the tracking mount of a mobile optical ground station. A nonlinear integral sliding manifold is introduced to eliminate steady-state errors caused by constant matched disturbances while avoiding excessive integral action for large errors. In addition, an error-dependent damping mechanism is embedded to strengthen disturbance rejection when the tracking error is driven away from the origin and to preserve fast response near equilibrium. Experiments on a mobile laser-communication tracking mount under composite conditions (large step commands, wind perturbations, and step disturbances) demonstrate reduced peak tracking error and faster error decay with negligible overshoot compared with a conventional STA baseline. The proposed design provides a practical robust control solution for precision tracking in complex outdoor environments.