中文说明：这是一个带观测器的状态反馈控制系统。采用极点置换技术的状态反馈，保证了系统的稳定性，是为摆杆系统设计的。对于这个simulink模块，用户需要首先在状态空间方程中设计系统。状态反馈增益K和观测器增益L由用户根据系统模型确定。用户需要定义状态空间的A、B、C、D以及控制器部分的增益K和L；
English Description：
This is a state feedback with observer control system. The state feedback using pole replacement technique where the stability of the system is guarantee. It is design for pendulum link system. For this simulink block, the user need to design the system in the state space equation first. The gain K for state feedback and L for observer is determine by the user from the system model. The user need to define the A, B, C, D for the state space and the gain K and L for the controller part.