在箭载电气系统应用中对IEEE1588同步协议的研究与改进

Research and Improvement of IEEE 1588 for Rocket's Electrical System Application

箭载电气系统网络需要进行严格时钟同步。在分析箭载环境对时钟同步协议影响的基础上,从主从延迟、报文交换流程、时钟校正算法等方面对IEEE 1588V2.0时钟同步协议进行了研究与改进,使用了透明时钟并提出了滑动时窗的老化滤波算法来对从时钟相位偏移和频率偏移进行校正。在Simulink中使用Simevents工具箱搭建了箭载网络模型,对简化网络拓扑、单机内部模块进行了建模,完成了对改进IEEE 1588同步协议的仿真验证与定量分析,为指导工程实践提供了有力支持。

The rocket’s electrical system network requires strict clock synchronization.This paper analyzes the effect of rocket’s environment on the synchronization protocol,and improves the IEEE 1588 in the master-slave clock delay,packet exchange process and clock correction algorithm.We use transparent clock and propose an average filtering based on sliding time-window to correct the clock phase offset and frequency offset.We build a network model using Simevents in Simulink,and complete the analysis of master-slave delay,crystal oscillator model,network topology and internal structure of terminal and switch.The simulation verification and quantitative analysis of the improved IEEE 1588 protocol provide strong support for the engineering practice.