用matlab的simulink实现状态观测器设计及仿真，绘出state-space 模块的输出值的阶跃响应曲线以及观测器的输出值的阶跃响应曲线。-To achieve observer status with the design and simulation of matlab simulink, step response curve step response curve and observing the output value is plotted state-space module output value.