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Application of Compound HSMDOB in Line-of-Sight Stabilization

Line-of-Sight(LOS) stabilization is the primary condition for ensuring stable platform tracking accuracy. Factors affecting the stability of the LOS include wind resistance torque, friction torque, mass imbalance torque, etc. In order to overcome the disturbance and ensure the stability of the LOS, in this paper the method of disturbance compensation is studied from the level of refined anti-disturbance, and the composite high-order sliding mode interference compensation control strategy is adopted. A high-order sliding mode disturbance observer is designed for the equivalent disturbance of the system and combined with the finite time convergence theory. The disturbance is effectively estimated and compensated. A high-order sliding mode compensator is designed to compensate for the unestimated state of the interference, further compensating for the unestimated state of the interference. Finally, the stability of the system is proved by Lyapunov theory, and the effectiveness of the method is verified in the MATLAB simulation environment.