Abstract: With the network-induced time-delay and data packet losses in Networked Control Systems（NCS），the performance of control systems degrades，even destabilizes.Also in practice，the states of some systems are unmeasured.In this paper，a state observer is designed to estimate the states，and when data packet losses，the state observer can compensate it.Then exponential stability theory is used to analyze the stability of the close loop system，and the method of how to calculate the control parameter is given.At last a DC motor is used to simulate.The result of the experiment shows the validity of the proposed method，which well guarantees the stability of networked control systems with network-induced time-delay and data packet losses.

Key words: Networked Control Systems（NCS）, state observer, data packet losses, exponential stability

摘要： 由于网络控制系统中网络诱导时延和数据包丢失等问题的存在，使得网络控制系统控制性能下降甚至导致系统地不稳定。同时在实际应用中，一些系统的状态是不可测量的。针对上述问题，设计了状态观测器，利用测量输出进行了状态重构，并利用状态观测器对丢包进行了补偿。最后应用指数稳定定理分析了整个系统的闭环稳定性，给出了状态控制率的求解方法，并对一直流电机进行了仿真，仿真实验结果表明，该方法能有效地补偿网络控制系统的性能，保证了在时延和有数据包丢失的情况下网络控制系统的稳定性。

关键词: 网络控制系统, 状态观测器, 数据包丢失, 指数稳定性