研究了一类带有不确定控制系数和依赖于不可测状态增长非线性系统的输出反馈扰动抑制问题。主要由于控制系数的不确定性,使得该控制问题不能用现有方法来解决。为了实现系统的扰动抑制目标,首先引入了高增益K-滤波器,进而构造了基于K-滤波器的状态观测器,然后利用反推技术设计了线性输出反馈控制器。通过选择恰当的设计参数,实现了L2-增益意义下的扰动抑制。 A class of output feedback disturbance rejection problems with uncertain control coefficients and nonlinear systems that depend on unmeasured state growth are investigated. Mainly due to the uncertainty of the control coefficient, the control problem can not be solved by the existing methods. In order to achieve the goal of system disturbance suppression, a high-gain K-filter is introduced firstly, and then a state observer based on K-filter is constructed. Then a linear output feedback controller is designed by using the backstepping technique. By choosing proper design parameters, the disturbance rejection in L2-gain is achieved.