基于采购平台的时钟同步算法研究

Research on Clock Synchronization Algorithm Based on Procurement Platform

电子采购平台要保证各方行为的安全性与信用,因此需要对交易过程及文件进行可信赖的时间标识。因为客户桌面时间可以随时更改,不足以信赖,因此我们采用时间戳服务,这类服务信赖程度高,且具有安全性。时间戳系统会将确认的时间与特定的电子数据绑定到一起,从而保证节点时钟同步[1]。但在现实应用过程中受到无线网络环境因素的限制,时钟同步性能会受到影响,本文将针对无线网络中噪声对时钟同步的影响进行研究,对观测到的离散含噪声观测数据进行Kalman滤波,建立时钟同步状态空间模型,并对系统展开无偏差的最优估计,通过仿真验证算法的有效性。

In the electronic procurement platform system, it is required that all parties involved in the transaction cannot deny their behavior, and it is necessary to carry out a reliable time stamp for the transaction to solve a series of business and legal problems. Because it is relatively simple to change the user’s desktop time, the reliability of the time is not high, so it is necessary to provide a time stamp service that is highly reliable and cannot be denied. The time stamping system ties the confirmed time to specific electronic data, so ensuring the synchronization of node clocks is the basis for fairness in the procurement platform. However, in practical applications, due to the limitations of various factors in the wireless network,the clock synchronization performance will be affected. This paper will study the effect of noise on the clock synchronization in the wireless network. Kalman filtering is performed on the observed discrete noise-containing observation data to establish. The clock synchronization state space model is developed, and an unbiased optimal estimation is carried out for the system, and the effectiveness of the algorithm is verified by simulation.