Closed-Loop Inner–Outer Dual-Loop Attitude Adjustment Control for Dual-Super Spacecraft with Pointing Constraints

As a high-precision and high-stability engineering platform for aerospace missions, the dual-super spacecraft is subject to numerous environmental constraints and disturbances in increasingly complex space environments, posing significant challenges to its attitude maneuvering process. Unlike traditional spacecraft, the dual-super spacecraft consists of two cabins: a payload cabin and a platform cabin, with a magnetic levitation mechanism installed between them to prevent vibration transmission. This paper establishes a multi-coupled attitude model for the payload cabin, the platform cabin, and the magnetic levitation mechanism between them. Additionally, a collision avoidance control strategy is designed for the magnetic levitation mechanism to ensure the operational safety of the entire system. To address the external environmental constraints, a closed-loop dual-loop control framework is proposed for the payload cabin. The outer-loop performs stability control on the payload cabin, while the inner-loop employs explicit reference governor (ERG) to handle pointing constraints. The platform cabin follows the attitude control of the payload cabin, forming a master–slave coordinated control scheme. Simulation results demonstrate that the proposed multi-coupled control system framework performs effectively, ensuring both the satisfaction of pointing constraints and the operational safety of the dual-super spacecraft system.