“MPROVEMENT OF ACTIVE DISTURBANCE REJECTION CONTROL PERFORMANCE INTHE TARGET-INDICATING GIMBAL SYSTEM USING THE M-TH ORDEREXTENDED STATE OBSERVER WITH FREQUENCY ESTIMATION”. Kashf Journal of Multidisciplinary Research, vol. 3, no. 10, Oct. 2026, pp. 14-34, https://doi.org/10.71146/kjmr1029.