多时钟同步方案的比较与测试

Comparison and testing of multi-clock synchronization methods

摘要:

时间同步是时间触发通信的关键技术，但时间同步方案有多种，难以选择。文章提出了新的问题——寻找特定网络环境下最适用的同步方案，论文首先回顾了时间同步技术发展的相关工作，介绍了星型主从同步，环型主从同步和RBS同步三种方案的原理与基于STM32F407芯片的系统基本原理和实现要点，提出了修正时钟漂移速率的创新方法，并对方案进行理论分析，归纳各方案的优势、缺陷与适用场合。最后在少节点的多时间同步系统中完成各方案测试，证明三种方案同步精度都可以达到微秒级，比较各同步系统的同步精度，最终结果可以验证先前理论分析的准确性。

Abstract:

Time synchronization is the key technology of time-triggered communication, but there are many different kinds, which are difficult to choose from. The paper put forward a new question——finding the most suitable synchronization method in a specific network environment. It reviewed the work related to the development of clock synchronization; introduced principles and keys to practical system based on STM32F407 chip of the three methods, star master-slave synchronization, ring master-slave synchronization and RBS synchronization; put forward an innovative method for correcting clock drift speed. It also carried on theoretical analysis, summarized the advantages, shortcomings and applicability. Finally, the paper completed the test in multi clock synchronization with a small amount of nodes. The results show that the three methods can achieve microsecond synchronization accuracy. The results can verify the accuracy of the previous theoretical analysis after comparing the synchronization accuracy of the three synchronization systems.