Method and device for improving synchronization precision among multiple clocks

A technology of synchronization accuracy and clock, which is applied in the field of network communication systems, can solve the problem of low clock synchronization accuracy and achieve the effect of high synchronization accuracy

Active Publication Date: 2020-09-01
CETC AVIONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the existing problem of low clock synchronization accuracy between clock sources in devices containing multiple clock sources. The present invention prov...

Method used

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  • Method and device for improving synchronization precision among multiple clocks
  • Method and device for improving synchronization precision among multiple clocks
  • Method and device for improving synchronization precision among multiple clocks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Such as Figure 1 to Figure 3 As shown, a method for improving synchronization accuracy between multiple clocks of the present invention includes a multi-source clock device, which includes multiple hardware clocks; in this embodiment, the multi-source clock device includes a CPU and a switch Chip, the CPU includes a first hardware clock and a hardware register, and the exchange chip includes a second hardware clock;

[0053] The method includes the following steps:

[0054] S1: Based on the precise synchronization clock protocol, synchronize the second hardware clock in the multi-source clock device with the main clock device in the network; such as figure 1 As shown, the second hardware clock in the multi-source clock device is synchronized with the master clock device in the network through the IEEE 1588v2 protocol, and the master clock device in the network is a time keeping device in the network.

[0055] S2: Configure the synchronized second hardware clock and trigger th...

Embodiment 2

[0071] Such as Figure 1 to Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides an apparatus for improving synchronization accuracy among multiple clocks, and the apparatus for improving synchronization accuracy among multiple clocks includes a multi-source clock device, The multi-source clock device includes multiple hardware clocks; it also includes a memory storing a method program for improving synchronization accuracy between multiple clocks in Embodiment 1;

[0072] It also includes a processor, configured to execute the method program for improving the accuracy of synchronization between multiple clocks to perform operations of the following units:

[0073] Synchronization unit: Based on the precise synchronization clock protocol, synchronize a hardware clock in a multi-source clock device with the master clock device in the network;

[0074] Configuration and trigger unit: configure the synchronized hardware clock and tr...

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Abstract

The invention discloses a method and a device for improving the synchronization precision among multiple clocks, and the device comprises multi-source clock equipment which comprises a plurality of hardware clocks. The method comprises the following steps: based on a precise synchronous clock protocol, synchronizing a certain hardware clock in multi-source clock equipment with main clock equipmentin a network; configuring the synchronized hardware clock, triggering a PPS signal, and providing a clock synchronization signal source for other hardware clock sources in the multi-source clock device; obtaining counting information of a synchronized hardware clock source when the PPS signal is generated, and calculating real characteristics of the synchronized hardware clock source; and correcting the synchronized hardware clock source in the multi-source clock equipment so as to achieve clock synchronization among multiple clocks in the equipment. According to the method, the defect that time is obtained through CPU interruption traditionally is overcome, a hardware mode is adopted, nanosecond-level synchronization is achieved among multiple clocks in the equipment, and the synchronization precision is high.

Description

Technical field [0001] The present invention relates to the technical field of network communication systems, in particular to a method and device for improving synchronization accuracy between multiple clocks. Background technique [0002] The network clock synchronization technology is extremely important for time-sensitive networks. For example, during the live broadcast of a large-scale event, video and audio data must be transmitted and processed in high real-time; driverless technology needs to complete real-time processing of various complex signals. Therefore, clock synchronization technology is the basis of such real-time applications. [0003] Such as figure 1 As shown, a device generally containing multiple clocks is mainly composed of a configuration management CPU and a switching chip for data forwarding. There are two sets of hardware clocks in this system, namely hardware clock 1 (the hardware clock of the CPU) and hardware clock 2 (the clock in the exchange chip)....

Claims

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Application Information

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IPC IPC(8): H04J3/06
CPCH04J3/0644H04J3/0685
Inventor 王瑞向柯
Owner CETC AVIONICS
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