Combined Model Predictive Control for Geosynchronous Satellite Station Keeping Using Electric Propulsion

Novel combined model predictive control method is presented, which includes long-term trajectory planning, outer-loop model predictive trajectory and angular momentum control, and inner-loop attitude control. Firstly, the influence of long-period perturbation characteristics on long term station keeping of geosynchronous satellite is fully considered, and the station keeping trajectory is optimized for 3 months to 6 months. Then, taking the long-term planning results as the reference trajectory and considering the engineering constraint model, the outer-loop control is realized within 7 days to 14 days, so that the position trajectory meets the planning expectations and meets the requirements of orbit and angular momentum optimal control. The inner loop control adopts the attitude control method considering the continuous torque effect of small thrust, so as to meet the requirements of real-time angular momentum and attitude control with higher frequency. The method has been successfully verified by on-orbit flight tests, showing the characteristics of high control accuracy, high fuel utilization efficiency, and being adaptive to various engineering constraints.