Research on frequency-band characteristics and parameters configuration of linear active disturbance rejection control for second-order systems

Starting with frequency domain analysis, the tracking ability of linear extended state observer(LESO) and the characteristics of linear active disturbance rejection control(LADRC), such as the stability, rejection quality for external disturbance, robustness for control input gain uncertainty and model uncertainty, as well as noise sensitivity characteristics, are analyzed based on the close-loop transfer function and frequency response. Then, the relationship between the dynamic characteristics and the controller parameters is discussed and the method of parameter selection is proposed. Finally, the method is applied to a weapon control system, and its effectiveness is validated. In addition, issues such as overshoot phenomenon, actuator saturation and the design of pre-filter are addressed, establishing both the conceptual and practical foundation for engineering design.