Method for improving time synchronization precision under complex network environment

A time synchronization precision and complex network technology, which is applied in the direction of synchronization device, multiplex communication, time division multiplexing system, etc., can solve the problem that the equipment cannot be synchronized normally, the uplink and downlink delays are inconsistent, and the synchronization accuracy cannot meet the requirements of engineering projects Requirements and other issues to achieve the effect of improving time synchronization accuracy and stability, compensating network delay, and compensating master-slave clock deviation

Inactive Publication Date: 2015-03-25
CHENGDUSCEON ELECTRONICS
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Problems solved by technology

[0005] The present invention provides a method for improving time synchronization accuracy in a complex network environment, aiming at complex and variable network jitter, inconsistent uplink and downlink time delays, etc., and mainly solves the...

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  • Method for improving time synchronization precision under complex network environment
  • Method for improving time synchronization precision under complex network environment

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Embodiment

[0036] Combining the above, such as figure 2 As shown in the method for improving time synchronization accuracy in a complex network environment, this embodiment proposes a delay detection algorithm to obtain an adaptive network delay threshold, and compensates for the time deviation caused by asymmetrical delay to obtain a relatively stable and accurate time stamp , including the following steps:

[0037] (1) The master and slave clocks extract the time stamps of T1, T2, T3, and T4 respectively;

[0038] (2) According to the downlink delay D1=T2-T1; uplink delay D2=T4-T3, calculate the respective delays;

[0039] (3) Use the delay detection algorithm to obtain the uplink and downlink delay threshold;

[0040] Usually, the network time synchronization algorithm is based on the requirement that the uplink and downlink delays are symmetrical. In practical applications, the uplink and downlink transmissions are often asymmetrical, that is, when the uplink and downlink transmis...

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Abstract

The invention discloses a method for improving time synchronization precision under a complex network environment. The method mainly solves the problems that synchronization precision of an existing network time synchronization method can not meet requirements of engineering projects and in a serious case, master equipment and slave equipment can not be synchronized normally. The method includes the first step that that a master clock and a slave clock extract timestamps of multiple moments respectively; the second step that unlink delay and downlink delay are measured, and an uplink time delay threshold value and a downlink time delay threshold value are obtained through a time delay detection algorithm; the third step that the timestamps corresponding to the moments beyond the time delay threshold values are removed; the fourth step that precise network time delay is figured out through a time synchronization algorithm and an asymmetrical time delay compensation algorithm; the fifth step that the time of the master clock and the time of the slave clock are synchronized by the utilization of the time synchronization algorithm. The method is suitable for any network time synchronization algorithm, and by the adoption of the method, the time synchronization precision and stability can be greatly improved.

Description

technical field [0001] The invention relates to a method for improving time synchronization accuracy in a complex network environment, and belongs to the technical field of time synchronization networks. Background technique [0002] With the wide application of information technology and network technology, the signal requirements of all equipment in the system are consistent. Such as satellite launch and measurement and control system, aviation management system, social linkage system and banking system, etc. These applications have high requirements on the consistency and accuracy of the clock in the distributed system, and any error may lead to very serious consequences. [0003] Network time synchronization is based on TCP / IP technology. Commonly used network time synchronization adopts master-slave clock mode, such as NTP and PTP, etc., such as figure 1 As shown, usually the master clock records the sending synchronization time T1, and the slave clock records the tim...

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Application Information

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IPC IPC(8): H04J3/06H04L7/00
Inventor 章巍熊嘉明朱敏段力
Owner CHENGDUSCEON ELECTRONICS
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