晶振源特性对IEEE1588同步性能影响的量化分析  

Quantification analysis of oscillator's effect on IEEE1588 synchronization performance

作　　者：陈雷[1] 朱天林[1] 刘锋[1] 王伟[1] 

机构地区：[1]北京跟踪与通信技术研究所,北京100094

出　　处：《电子测量与仪器学报》2014年第6期650-656,共7页Journal of Electronic Measurement and Instrumentation

基　　金：国家"863"计划(2011AA0474)资助项目

摘　　要：晶振源质量是IEEE1588同步性能的决定性因素之一,其影响程度受复杂物理特性及时钟伺服影响,量化分析尚不完善,仅能适用于高稳晶振。以经典PI伺服为例,引入时钟伺服影响因子,推导出晶振准确度和稳定度对IEEE1588同步性能的影响公式,基于改进型终端搭建满足理论假设的实测环境,统计测得基于XO-5ppm的同步精度优于500 ns、标准差约为130.97 ns,基于OCXO-0.5ppm的同步精度优于50 ns、标准差约为7.95 ns。测试表明同等环境下,晶振质量对IEEE1588同步起到决定性影响,完善后的量化分析同时适用于高稳晶振和低稳晶振,具有更好的适用性。Oscillator＇s quality is one of decisive factors in IEEE1588 synchronization.But its quantification analysis is not practicable,only fits for high-stability oscillator analysis,some complex physical factors and effect of clock servo.The paper introduced clock servo effect factor with an example as PI servo,and derived the theoretical effect formula of oscillator＇s accuracy and stability on IEEE1588 synchronization.Then based on real test environment built on modified IEEE1588 clock,the statistical data was gotten：the accuracy based on XO-5ppm was better than 500 ns with standard deviation 130.97 ns,the accuracy based on OCXO-0.5ppm was better than 50 ns with standard deviation 7.95 ns.The test results verify that the oscillator＇ s quality almost can decide the IEEE1588 performance in the same environment,and the advanced analysis is better in applicability than traditional analysis with being fit for both high-stability and low-stability oscillators well.

关 键 词：IEEE1588 晶振源 同步精度 稳态标准差 

分 类 号：TN911.72[电子电信—通信与信息系统]