Characterizations of Time Synchronization Protocols and Their Applications
Date Issued
2012
Date
2012
Author(s)
Wang, Te-Kwei
Abstract
Time synchronization protocols play an important role in numerous applications, such as instrumentation, power systems and high-speed communications. With the rapid advances in technology, the demands placed on the accuracy of time synchronization have increased. The precision time synchronization protocol (PTP) was the first protocol developed to successfully synchronize distributed devices in the sub-microsecond (10-6 seconds) range. This dissertation firstly introduces the background knowledge regarding time synchronization protocols as well as the measurement of time and frequency. Then the ideas of PTP are investigated. New applications of PTP are proposed then. For example, PTP can be used as the case of the time measurement system to replace the Time Interval Counter (TIC). The benefits of PTP based time frequency measurement include low cost and high efficiency.
The Gray Proportional Integral (GPI) controller and the Threshold Proportional Integral (TPI) controller are proposed to reduce the transient time interval during the time synchronization processes. Since PTP can provide time synchronization precision in the sub-microsecond (10-6 seconds) level, the time stamps are used as the encryption parameters. The pass words are revised every second. Such hind of Time Varying Encryption System (TVES) is quite safe since it is difficult to be cracked.
Subjects
Time Synchronization Protocol
Time Interval Counter
Gray Proportional Integral Controller
Threshold Proportional Integral Controller
Time Varying Encryption System
Type
thesis
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