Skip to content

Commit

Permalink
big change again
Browse files Browse the repository at this point in the history
  • Loading branch information
wingjay committed May 8, 2016
1 parent 4f0a4aa commit 2fab225
Show file tree
Hide file tree
Showing 8 changed files with 154 additions and 214 deletions.
10 changes: 10 additions & 0 deletions bib/thesis.bib
Original file line number Diff line number Diff line change
Expand Up @@ -679,3 +679,13 @@ @article{69
pages={047},
year={2005}
}

@inproceedings{70,
title={A fuzzy PID controller for multi-model plants},
author={Wang, Ning},
booktitle={Machine Learning and Cybernetics, 2002. Proceedings. 2002 International Conference on},
volume={3},
pages={1401--1404},
year={2002},
organization={IEEE}
}
11 changes: 5 additions & 6 deletions tex/abstract.tex
Original file line number Diff line number Diff line change
Expand Up @@ -4,13 +4,13 @@
%%==================================================

\begin{abstract}
时钟同步问题来源于工业中分布式系统的发展和实时性任务的需求,核心问题是通过同步方法来实现各个子系统之间的时钟一致性,传统的GPS同步方法和NTP(网络时钟同步协议)等协议由于价格昂贵、同步精度差等原因满足不了工业需求,IEEE1588精确时钟同步协议协议是目前时钟同步领域最好的同步方法,不过其在实际使用中由于链路延时等因素影响难以达到亚微秒甚至纳秒同步精度以及无法保证从时钟的稳定性
时钟同步问题来源于工业中分布式系统的发展和实时性任务的需求,核心问题是通过同步方法来实现各个子系统之间的时钟一致性,传统的GPS同步方法和NTP(网络时钟同步协议)等协议由于价格昂贵、同步精度差等原因满足不了工业需求,IEEE1588精确时钟同步协议协议是目前时钟同步领域最好的同步方法,不过其在实际使用中由于链路延时等因素影响难以达到纳秒甚至亚纳秒的同步精度以及无法保证从时钟的稳定性

本文从统计角度出发,对链路延时、时钟伺服系统及时钟频率漂移补偿进行深入研究,旨在提供一种系统性的统计方法来提高IEEE1588时钟同步系统精度及稳定性,主要工作如下
本文从统计分析的角度研究了链路延时、时钟伺服系统及时钟频率漂移补偿的相互关系,以提高IEEE1588时钟同步系统精度及稳定性,主要研究内容如下

(1) 基于对链路延时数学特性分析,从统计角度提出动态阈值法与基于固定时间窗的实时监控算法等以提高同步精度
(1) 基于链路延时的统计特性,研究了动态阈值法和滑动时间窗的实时监控算法,以提高同步精度

(2) 在时钟伺服系统中,针对链路时延的阶跃突变干扰采用多模型PID控制策略,以优化从时钟的稳定性,减少从时钟的频繁抖动以保证整个系统的平稳运行
(2) 在时钟伺服系统中,针对链路时延的阶跃突变干扰采用多模型PID控制策略,以优化从时钟的稳定性,减少从时钟的频繁抖动

(3) 对于时钟频率漂移问题,通过监测PTP报文样本是否发生链路堵塞等来进行报文过滤,只选取正常链路传输的PTP样本来进行校正,从而提高频率偏差计算的准确度;

Expand Down Expand Up @@ -38,5 +38,4 @@
(4) Based on stateflow time-synchronization simulation system, all the promoted methods above get validated and verified. The simulation results show us those methods above can improve the adaptive ability of time-synchronization system for multiple types of latency changes, and the synchronization precision and stability of whole system as well.

\englishkeywords{\large clock synchronization, statistical method, frenquency compensation, clock servo, stateflow}
\end{englishabstract}

\end{englishabstract}
35 changes: 17 additions & 18 deletions tex/chapter_1.tex

Large diffs are not rendered by default.

65 changes: 28 additions & 37 deletions tex/chapter_2.tex

Large diffs are not rendered by default.

86 changes: 29 additions & 57 deletions tex/chapter_3.tex

Large diffs are not rendered by default.

159 changes: 64 additions & 95 deletions tex/chapter_4.tex

Large diffs are not rendered by default.

Binary file modified thesis.synctex.gz
Binary file not shown.
2 changes: 1 addition & 1 deletion thesis.tex
Original file line number Diff line number Diff line change
Expand Up @@ -77,7 +77,7 @@
% \include{tex/intro_chapter01}
% \include{tex/intro_chapter02}
% \include{tex/intro_chapter03}
\include{tex/summary}
% \include{tex/summary}

\appendix % 使用英文字母对附录编号,重新定义附录中的公式、图图表编号样式
\renewcommand\theequation{\Alph{chapter}--\arabic{equation}}
Expand Down

0 comments on commit 2fab225

Please sign in to comment.