摘要： 针对局域网时间同步软硬件方法各自存在的不足,介绍局域网时间同步模型及抗差估计的原理,建立时间比对模型,提出利用抗差估计进行局域网时间同步的新方法,并通过时钟保持策略降低CPU开销,分别用最小二乘平差法和抗差估计法对实测数据进行处理,分析两者的精度差异。实验结果表明,该同步方法硬件配置简单,能有效抑制网络延迟影响,系统稳定性好,同步精度高。
关键词:
最小二乘法,
抗差估计,
时间同步,
网络延迟,
时间比对,
时钟保持
Abstract: In view of the defect existed in the time synchronization of Local Area Network(LAN) using hardware and software methods,this paper introduces the principle of time synchronization in LAN and the method of robust estimation.The model of time comparison is established.A new method for time synchronization in LAN using the robust estimation method is proposed,and uses the clock retaining strategy to save the overhead of CPU.The least squares adjustment method and the robust estimation method are respectively used for measuring data processing to analyze the accuracy difference.Experimental results show that the synchronization method has the advantages of simple hardware configuration with high synchronization precision,and it effectively restrains the influence of network delay while keeping the good stability of system.
Key words:
Least Square Method(LSM),
robust estimation,
time synchronization,
network delay,
time comparison,
clock retaining
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