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A Method of Accurate Time Synchronization of Signaling System Based on IEEE 1588 Protocol

An IEEE1588, precise time synchronization technology, applied in the transmission system, time division multiplexing system, multiplexing communication, etc., can solve the problems that NTP cannot meet the accuracy requirements of time synchronization in the signal system, and achieve the effect of increasing protection

Active Publication Date: 2021-01-08
TIANJIN JINHANG COMP TECH RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0033] The technical problem to be solved by the present invention is: the existing NTP cannot meet the precision requirements for time synchronization of hard real-time systems such as signaling systems

Method used

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  • A Method of Accurate Time Synchronization of Signaling System Based on IEEE 1588 Protocol
  • A Method of Accurate Time Synchronization of Signaling System Based on IEEE 1588 Protocol
  • A Method of Accurate Time Synchronization of Signaling System Based on IEEE 1588 Protocol

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Embodiment 1

[0066] Typical signaling system network networking such as Figure 4 As shown, each signaling subsystem is connected to the ATC network. For any two signal systems, it can be simplified as Figure 5 connections shown. The two signaling systems are connected via open or closed Ethernet. The corresponding synchronization function can be completed by running IEEE1588 synchronization protocol and bilateral delay detection software on the signal system.

[0067] Synchronization process:

[0068] The master clock and slave clock calibration process of IEEE1588 is as follows: Figure 6 Shown:

[0069] The slave clock first obtains the path delay delay through the round-trip iteration of message transmission, then calculates the time offset (ffset) of the master and slave clocks, and finally adjusts and synchronizes the slave clocks.

[0070] 1) The slave clock receives the Sync broadcast message sent by the master clock at tC2;

[0071] 2) At time tC3, the slave clock receives...

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Abstract

The invention relates to the technical field of urban rail transit signals, in particular to a signal system accurate time synchronization method based on an IEEE 1588 protocol, which comprises the following steps: for any two signal systems, connecting the two signal systems through an open or closed Ethernet; And operating an IEEE1588 synchronization protocol on the signal system to complete synchronization. The method is a method for checking the effectiveness of time synchronization, and can be added to any time synchronization scheme based on communication to detect the time synchronization failure caused by accidental delay and hardware failure on a link; By encrypting the check frame, the IEEE 1588 protocol is not changed, the malicious attack protection is increased, the attack prevention of the unencrypted synchronous information is completed, and the method can be safely operated in a wide area network or a non-closed network.

Description

technical field [0001] The invention relates to the technical field of urban rail transit signals, in particular to a precise time synchronization method for signal systems based on the IEEE 1588 protocol. Background technique [0002] Ideally, the clock of the signaling system should be defined as c(t)=t, where t represents the reference time. However, due to the defects of the clock oscillator, the actual clock function model of the signaling system is: [0003] c i (t) = φ i +ω i t+ε i [0004] where: parameter φ i and ω i represent the phase offset and clock frequency offset respectively, ε i represents random noise. [0005] Neglecting the influence of random noise, the clock relationship between two signal systems can be expressed as [0006] c 1 (t) = φ 12 +ω 12 c 2 (t) [0007] where φ 12 and ω 12 are the relative clock phase offset and frequency offset of signal system A and signal system B, respectively. when c 1 (t)=c 2 (t) the two clocks are c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06H04L29/06
Inventor 郭飞刘帅肖晨来瑞珉王清永
Owner TIANJIN JINHANG COMP TECH RES INST