Established the high-precision satellite attitude simulation system for ground-based optical communication experiment. For the features satellite trajectory

design an improved auto-disturbance-rejection control algorithm. First

introduced the characteristics and principle of auto disturbance rejection control technology. Then

proposed the improved servo algorithm

added selective integration item for ADRC algorithm. To satisfy ± 10" dynamic error requirements of system

designed multi threshold non-linear function

and then added state determine module to change non-linear function parameters in real time. At the same time

given the setting principle of the algorithm parameters. Then

based on the open servo functions of controller

the realization of the method and process was design for improved ADRC algorithm. The experimental results showed that? the dynamics following error of tracking ramp signal was ± 6 "

the system had a good capacity for acceleration and deceleration. By contrast

in the satellite attitude trajectory tracking

the auto-disturbance-rejection control of anti-interference ability is superior to PID

and the following error was ± 7 ". Auto disturbance rejection control algorithm met the requirements of high-precision attitude simulation and also had stability and strong anti-interference ability.