Study on Active Disturbance Rejection Control For Airborne Photoelectric Scout Platform

PID controller is widely used in servo system of airborne photoelectric scout platform.However,its inherent drawbacks limit the performance improving of platform's servo system.An active disturbance rejection controller(ADRC) is designed to solve these problems.It overcomes limitations of PID controller by several means,such as arranging the transient of reference signal,estimating the differential of both reference signal and output signal,acquiring real-time estimation and compensating all kinds of the disturbances of servo system,etc.A series of simulated contrast tests between ADRC and PID controller are carried out.The Results show that the performances of platform's servo system with ADRC are superior to that of system with PID controller.It has a quicker step response without overshoot,and is insensitive to model perturbation and measurement noise.Furthermore,it has a strong ability to reject exterior disturbances,and is able to overcome negative influence on low speed kinetic performance of platform imposed by friction.At last,several parameter setting rules for ADRC are proposed.