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为解决临近空间飞行器的稳定跟踪控制问题,考虑模型参数不确定和外界未知干扰对跟踪控制性能的影响,基于backstepping方法与非线性控制理论设计稳定跟踪控制算法。将通用临近空间飞行器数学模型转化为严反馈形式,采用backstepping方法递归求取控制信号,并利用非线性方法对控制器进行设计,从而保证了系统的稳定性和鲁棒性。仿真结果表明,给出的控制方法能有效抑制模型参数不确定和外界干扰的影响,对于实现临近空间飞行器的稳定跟踪控制具有较好的应用价值。
In order to solve the problem of stable tracking control for near space vehicles, the influence of uncertainty of model parameters and unknown disturbance on tracking control performance is considered. A stable tracking control algorithm is designed based on backstepping method and nonlinear control theory. The mathematical model of the universal near space vehicle is transformed into a strict feedback form. The backstepping method is used to obtain the control signal recursively and the controller is designed by non-linear method so as to ensure the stability and robustness of the system. The simulation results show that the proposed control method can effectively restrain the influence of uncertain model parameters and external disturbances, and has good application value for realizing stable tracking control of near space vehicles.