Out-Degree Based Clock Synchronization In Wireless Networks Using Precision Time Protocol

Purpose of this research wants to use a device, called Dante board, the board enabled AD converter. It digitalizes audio and transmits the audio using TCP/IP technology through cat5 cable to replace the expensive analog cable used in the past. Still, there are some problems needed to be overcome. First of all, during the analog-to-digital process, distorted audio issues are often encountered due to inconsistency of the encoder during digital sampling. In order to compensate the distortion during the conversion, frequency needs to be filtered out to compensate or attenuate. Secondly, due to delay in Internet transmission, the audio outputs by each device may not be synchronized. Therefore, each device needs to have its own clock to overcome the delay and reach the synchronized effect through clock synchronization. Also, the IEEE1588 precision time protocol (PTP) is used in clock synchronization to synchronize the audio in each device.

Download Full-text

Application of Precision Time Protocol on Networked Control Systems

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.203.192 ◽

2012 ◽

Vol 203 ◽

pp. 192-197 ◽

Cited By ~ 1

Author(s):

Chuan Shun Yang ◽

Xiang Ying Kong

Keyword(s):

Control Systems ◽

Networked Control Systems ◽

Clock Synchronization ◽

Networked Control ◽

Detection Methods ◽

Test Results ◽

Precision Time ◽

Application Requirements ◽

Synchronization Accuracy ◽

Precision Time Protocol

In order to overcome the problem of the clock synchronization accuracy between scattered nodes was not high on traditional networked control systems, proposed a new method of using the IEEE 1588 standard for precision time protocol. First studied the principle and algorithm of precision time protocol, the best master clock algorithm and timestamp detection methods. Then presented the timestamp detection method with the use of software and hardware on networked control systems to improve clock synchronization accuracy, and analyzed the feasibility of the method in theory. Finally, tested accuracy of the clock synchronization, and the test results showed that synchronization accuracy can reach nanosecond, can meet the application requirements of the networked control systems.

Download Full-text

Optimal estimation and control of clock synchronization following the Precision Time Protocol

2010 IEEE International Conference on Control Applications ◽

10.1109/cca.2010.5611234 ◽

2010 ◽

Cited By ~ 5

Author(s):

Chongning Na ◽

Philipp Wolfrum ◽

Dragan Obradovic ◽

Ruxandra Lupas Scheiterer

Keyword(s):

Clock Synchronization ◽

Optimal Estimation ◽

Precision Time ◽

Estimation And Control ◽

And Control ◽

Precision Time Protocol

Download Full-text

The Implementation of IEEE 1588-2008 Precision Time Protocol on the STM32F107

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.522.868 ◽

2012 ◽

Vol 522 ◽

pp. 868-873 ◽

Cited By ~ 3

Author(s):

Guang You Yang ◽

Yi Zheng ◽

Zhi Yan Ma ◽

Xin Yu Hu

Keyword(s):

Control System ◽

Motion Control ◽

High Precision ◽

Clock Synchronization ◽

Time Stamp ◽

Protocol Stack ◽

Adjustment Mechanism ◽

Precision Time ◽

Precision Clock ◽

Precision Time Protocol

High precision clock synchronization is the basis for all applications in network-based distributed motion control system. To solve this problem, the clock synchronization principle is analysed; the initialization process of STM32F107VC PTP(Precision Time Protocol) hardware unit is introduced, and the process of capturing time stamp by PTP hardware unit, as well as clock adjustment mechanism, is in-depth dissected. PTPd v2 clock synchronization is realized in STM32F107VC platform supported by LwIP protocol stack. The results indicate that it is able to achieve an accuracy of less than 260ns clock synchronization based on STM32F107VC PTP hardware unit.

Download Full-text

Research and Implementations of the IEEE 1588 Precision Time Protocol Based on ARM-Linux

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.156-157.1492 ◽

2010 ◽

Vol 156-157 ◽

pp. 1492-1496

Author(s):

Guang You Yang ◽

Zhi Jian Ye ◽

Shuang Qing Zhang ◽

Wan Xu

Keyword(s):

Control System ◽

Distributed Control ◽

Clock Synchronization ◽

Distributed Control System ◽

Clock Frequency ◽

Ieee 1588 ◽

Working Principle ◽

Precision Time ◽

Specialized Hardware ◽

Precision Time Protocol

The clock synchronization is the key technology in distributed control system. This paper investigates the method to adjust computer clock frequency and time in embedded control system based on Ethernet. This paper also analyses the basic working principle of the IEEE 1588 Precision Time Protocol. In particular, it outlines the working principle of the free PTPd that is the software only implementations of the IEEE 1588 Precision Time Protocol. In the ARM-Linux environment, it presents a clock synchronization method to achieve high precise clock synchronization in distributed control system using PTPd. The results indicate that it is able to synchronize distributed clocks with the accuracy less than 500 microseconds using PTPd without the support of specialized hardware.

Download Full-text