基于PTP的无线分布式测试系统时钟同步研究

时钟(PTP)的发布使得分布式测试系统时钟同步精度大大提高，让各个传感器、执行器以及其它终端设备能够共享同一时钟基准，并能够精确保证不同终端的时钟同步质量。该文提出了无线分布式测试系统的网络拓扑结构，阐述了PTP时钟同步的过程，分析了PTP时钟同步调节算法的改进。通过MATLAB仿真给出了无线分布式测试系统典型网络拓扑下的PTP时钟同步的精度性能，引入偏移估计和斜率补偿，进一步提高了时钟同步的精度。

Clock Synchronization of Wireless Distributed Measurement System Based on PTP

The precision time protocol (PTP) improves the clock synchronization accuracy greatly and makes sensors, actuators and other terminals share unique time reference, which assures clock synchronization quality of different terminals. This paper puts forward a typical network topology in wireless distributed measurement system, and introduces the work process of PTP. The improvement of PTP clock synchronization adjust algorithm is analyzed. The clock synchronization accuracy of tree network topology is presented through simulation in MATLAB. The PTP clock synchronization offset can be reduced significantly with the implementation of drift estimation and skew compensation in tree network topology.