Pointing control of satellite antenna considering dynamic error of flexible-joint

Satellite antenna hold two degrees of freedom movement and positioning features to capture designated area information on the ground. The nonlinear characteristic of dynamic error impacts on pointing accuracy and satellite attitude. The forward and inverse dynamic model of satellite antenna is established firstly, Secondly, disturbance effects of Satellite Antenna are analyzed considering dynamic error of joint-flexible. Finally, real-time calculation of kinetic parameters of the antenna designed controller can directly compensate for dynamic errors caused by antenna joint disturbance. The asymptotic stability is established using Lyapunov stability theory. The result shows that the presence of dynamic error of flexible-joint can produce an unpredictable vibration response and velocity fluctuations even if the amplitude is small. With reasonable controller parameters, controller algorithm can completely compensate for the dynamic error and suppress its disturbance to satisfy the antenna pointing accuracy. The conclusion would have important academic value and engineering significance.