Improved Sliding Mode Control for Airborne Electro-Optical Stabilized Platforms Based on Disturbance Observer

To address low control accuracy, long adjustment times, and disturbances such as external interference and internal parameter variations, this paper proposes an Improved Non-Singular Fast Terminal Sliding Mode Control (I-NFTSMC) algorithm based on a disturbance observer. The algorithm estimates and compensates for unknown disturbances in real-time and introduces a time-varying switching gain to reduce chattering from high-frequency switching. Simulation results show that the I-NFTSMC algorithm improves response speed by approximately 42% and reduces rise time by about 44% under disturbance conditions compared to traditional methods. This approach achieves overshoot-free and accurate tracking of input commands, significantly enhancing the stability and disturbance rejection capabilities of airborne electro-optical platforms.