近地轨道集群航天器电磁编队飞行非线性反馈控制方法

Nonlinear Feedback Control of Fractionated Spacecraft Electromagnetic Formation Flying in Low-Earth Orbit

针对近地轨道集群航天器电磁编队飞行的动力学和控制问题,提出了一种非线性反馈控制方法.基于电磁力模型和地磁场模型,分析了地磁场对近地轨道电磁编队的影响;建立了集群航天器电磁编队高精度相对轨道动力学模型;基于Lyapunov稳定性理论设计了一种非线性反馈控制律,利用该方法对两星电磁编队维持控制进行了仿真验证.仿真结果表明,地磁场引起的电磁干扰力可以忽略,但是电磁干扰力矩的影响必须考虑;近地轨道集群航天器电磁编队是可控的,所设计的控制方法是可行的.

A method for designing the nonlinear feedback control law is proposed in this paper for the electromagnetic formation flying system of fractionated spacecraft in low Earth orbit.Firstly, the magnetic force model and the Earth＇s magnetic field model are established,respectively.The effects of the Earth＇s magnetic field on the electromagnetic formation flying system in low Earth orbits are analyzed.Secondly,the high precision relative orbit dynamics model is presented.Then,a nonlinear feedback control law for relative orbit is proposed based on the Lyapunov＇s stability theorem. Finally,two fractionated modules electromagnetic formation maintenance scenario is simulated. The simulation results show that the magnetic disturbance force can be ignored;but the disturbance torque cannot be ignored.Furthermore,the fractionated spacecraft electromagnetic formation flying is fully controllable and the approaches proposed are feasible.