应用简化LADRC的卫星激光通信链路跟踪精度优化研究OA

To address the limitation that conventional fine-tracking control algorithms deployed onboard satellite cannot substantially enhance the disturbance-rejection capability of pointing,ac-quisition,and tracking(PAT)system,a simplified linear active disturbance rejection controller(simplified LADRC)is adopted to optimize the tracking performance of satellite laser communi-cations link.The controller inherits the core idea of disturbance estimation through a linear ex-tended state observer(LESO)while substantially simplifying the components of the active dis-turbance rejection controller(ADRC).As a result,only 25 basic operations are required per in-put sample,making the controller well suited for implementation on relatively low-speed onboard electronic system.Through simulation experiments,the effectiveness of the simplified LADRC in improving tracking accuracy is verified.In presence of medium-and high-frequency vibrations commonly encountered in link-tracking scenarios,the simplified LADRC reduces the root-mean-square(RMS)tracking error from 2.12μrad under conventional proportional-integral-differential(PID)control to 0.92μrad,achieving a performance improvement of 57%.To address the"creep"phenomenon encountered in link-tracking operations,the simplified LADRC reduces the peak tracking error from 3.0μrad to 0.5μrad,corresponding to an 83%improvement in accuracy.The simplified LADRC requires a number of tuning parameters comparable to that of convention-al linear controllers,with low parameter-adjustment complexity.It can therefore significantly en-hance link-tracking accuracy,effectively mitigating the influence of satellite platform disturb-ances on the communications link and improving overall link stability.