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<p>In this paper, a <b>nonlinear gain sliding mode control (NGSMC)</b> is developed to improve position tracking performance and reduce chattering for the outer gimbal system in a line of sight (LOS) stabilization system. The proposed method consists of an <b>extended state observer (ESO)</b> and the <b>NGSMC</b>. The ESO is developed to estimate disturbances, including system uncertainties and external factors. To mitigate the chattering typically associated with the signum (sgn) function in sliding mode control, a nonlinear gain is introduced. The combination of the ESO and NGSMC results in enhanced position tracking and reduced chattering. The performance of the proposed method was validated via <b>MATLAB/Simulink</b> using a multibody model.</p>

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Nonlinear Gain Sliding Mode Control for Gimbal System in Line of Sight Stabilization System

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Seungchul Shin,
  • Junghun Ahn,
  • Jaeyoung Park,
  • Jungho Kim

摘要

In this paper, a nonlinear gain sliding mode control (NGSMC) is developed to improve position tracking performance and reduce chattering for the outer gimbal system in a line of sight (LOS) stabilization system. The proposed method consists of an extended state observer (ESO) and the NGSMC. The ESO is developed to estimate disturbances, including system uncertainties and external factors. To mitigate the chattering typically associated with the signum (sgn) function in sliding mode control, a nonlinear gain is introduced. The combination of the ESO and NGSMC results in enhanced position tracking and reduced chattering. The performance of the proposed method was validated via MATLAB/Simulink using a multibody model.