星座碰撞规避的迭代学习构型保持方法CSCD

针对低轨卫星星座运行中地球引力摄动的周期特性,基于迭代学习控制(ILC)方法,提出了星座碰撞规避的迭代学习构型保持方法。该方法由反馈控制和ILC两部分构成,分别抑制卫星运行过程中的非周期摄动和周期摄动对构型保持精度的影响,进而在地球非球形引力摄动未知条件下,通过相对构型的精确保持实现对星座卫星碰撞的有效规避。仿真结果表明,在地球J摄动影响下,与传统反馈控制相比,ILC方法以更小的控制输入实现了轨道保持精度的显著提升,进而在星座卫星轨道高度相近的情形下显著降低了碰撞风险,且控制器可在保证收敛性能的前提下,实现启动时间的灵活选择。

Iterative Learning Control Based Formation-Keeping Method for Constellation Collision Avoidance

Due to the periodicity perturbation of low earth orbit (LEO) satellite constellations, an iterative learning control (ILC) based formation keeping method is proposed. The method consists of feedback control and ILC control which respectively attenuate the influence of aperiodic and periodic perturbation on the accuracy of formation keeping. Collision of constellation satellites can be effectively avoided by precise formation keeping under the condition of unknown earth''s non-spherical gravitational perturbation. The simulation shows that the ILC method greatly improves the precision of orbit keeping with a smaller control input under the influence of earth J2 perturbation compared to traditional feedback control, and the collision risk between constellation satellites with similar orbit heights is significantly reduced. The controller can be flexibly activated with the convergence ensured.