School of Astronautics, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China; National Key Laboratory of Aerospace of Flight Dynamics, Xi'an, Shaanxi 710072, China.
School of Astronautics, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China; National Key Laboratory of Aerospace of Flight Dynamics, Xi'an, Shaanxi 710072, China.
ISA Trans. 2019 Dec;95:173-184. doi: 10.1016/j.isatra.2019.05.018. Epub 2019 May 24.
This paper studied the robust safety control problem for spacecraft proximity maneuvers in the presence of parametric uncertainties, external disturbances, and motion constraint. First, a cardioid-based curve is utilized to describe motion constraint, and two artificial potential fields are established to describe the collision-avoidance requirement. Then, by combining artificial potential field with the backstepping methodology, a robust safety control strategy is designed for close-range proximity operations with time-varying nonconvex motion constraint. Compared with the existing works, the presented control scheme can guarantee the convergence of relative pose errors, and ensure no collision happens between the two spacecraft during the rendezvous and proximity process. Finally, simulation results are provided to illustrate the feasibility of the presented control approach.
本文研究了存在参数不确定性、外部干扰和运动约束的航天器近距离机动的鲁棒安全控制问题。首先，利用心型曲线来描述运动约束，建立了两个人工势场来描述避碰要求。然后，通过将人工势场与反推方法相结合，设计了一种具有时变非凸运动约束的近距离接近操作的鲁棒安全控制策略。与现有工作相比，所提出的控制方案可以保证相对姿态误差的收敛性，并确保在交会和接近过程中两个航天器之间不会发生碰撞。最后，提供了仿真结果以验证所提出的控制方法的可行性。
