利用姿态机动的绳系卫星编队系统轨道协同控制

为克服绳系卫星编队系统在轨道机动过程中的系绳摆动现象，提出一种通过调整领航星推力方向进而实现编队系统轨道跟踪的控制算法。由于推力方向角与状态量互相耦合且少于系统自由度个数，轨道协同控制属于典型的非仿射欠驱动控制问题。针对此问题，首先采用升阶法将角速度作为虚拟控制输入；然后为各子系统设计子滑模面后加权得到高层滑模面和等效控制输入律，并设计观测器估计系统非线性项；其次基于模型预测控制算法优化得到最高层滑模面的趋近控制律；最后采用MATLAB/Simulink验证了所提控制算法的有效性。

Orbit Cooperative Control for Tethered Satellite Formation System via Attitude Maneuvering

In order to solve the tether libation problem of the tethered satellite formation system during orbit maneuvering, a control algorithm is proposed to realize orbit tracking of the formation system by adjusting the thrust direction of the leader satellite. Due to the coupling between the thrust direction angle and state variables, and the number of control inputs is less than the degree of freedom of the system, orbit cooperative control is a typically non affine underactuated control problem. Firstly, the angular velocity is used as the virtual control input by the step up method; then, the high level sliding surface and the equivalent control input law are obtained by designing the sub sliding surface after weighting for each subsystem, and an observer is designed to estimate the nonlinear term of the system. Secondly, switching control law of the higher level sliding mode surface is obtained by model predictive control algorithm. Finally, the effectiveness of the proposed control algorithm is verified by MATLAB/Simulink.