皮纳卫星编队保持动力学分析

摘要

针对皮纳卫星在编队飞行中的控制精度要求已提高到微米甚至纳米级,文章研究了小推力作用下高精度的皮纳卫星编队构型保持问题,在考虑摄动影响下,推导维持编队构型需要的控制力与编队距离、编队空间方位等参数之间的关系,为皮纳卫星编队构型的设计提供理论指导;同时基于bang-bang控制理论,使用有限状态机设计了一种高精度的编队控制律.仿真表明,提出的控制方法不但可以使系统快速收敛,同时还能使皮纳卫星编队的星间控制精度达到1μm,与滑模控制律相比较,精度提高近103倍.%To solve the control precision problem of the nano-pico satellite formation keeping, which had been the bottleneck of the nano-pico satellite applications,such as the earth-orienting technology,the high precision control theory was proposed based on low thrusters and the bang-bang control.A hybrid control principle and the finite-state machine were used to design the precision optimization of the formation keeping.An energy optimization control theory was developed based on the precision optimization.Simulation results show that the validity of the proposed strategy makes the system quickly converge to the equilibrium point and improves the reliability and precision of the nano-pico satellite formation keeping on the low thrusters.The formation keeping precision can reach 1 μm,which means the precision is 1 03times better than the sliding mode method.