基于H_∞鲁棒控制的挠性卫星姿态控制

Attitude Control of Flexible Satellite Using H_∞-based Robust Control Law

针对存在未建模动态、模型参数不确定性和外力矩扰动的挠性卫星,通过选择合适的加权函数将挠性卫星姿态控制问题转化为H∞混合灵敏度问题。采用H∞优化方法设计了鲁棒控制器。最后对卫星姿态控制系统进行了仿真研究,结果表明采用鲁棒控制器的姿控系统较传统的PID控制的姿控系统具有更好的鲁棒稳定性和抗干扰性能。

For flexible satellite disturbed by neglected dynamics, parametric uncertainties and external torque disturbance, attitude control problem was converted into an H∞ mixed sensitivity problem through choosing suitable weighting functions. The controller was designed by H∞ optimization. Satellite attitude was eventually studied by simulation. The results show that the robust stability and the disturbance rejection performance of the attitude control system with the robust controller are much better than that with PID controller.