Realization method of precision synchronous clock

A technology for synchronizing clocks and implementing methods, which is applied in the field of network communication and can solve the problems of considerable difficulty in the realization of control systems and control terminals.

Active Publication Date: 2010-10-20
KYLAND TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to obtain better precision, the NTP protocol needs to adopt many algorithms, and requires m

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  • Realization method of precision synchronous clock
  • Realization method of precision synchronous clock
  • Realization method of precision synchronous clock

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Embodiment Construction

[0030] Glossary:

[0031] 1588 clock PHY chip: a PHY chip that supports IEEE 1588 and IEC 61588 protocol functions, including:

[0032] 1. Able to identify IEEE 1588 or IEC 61588 protocol messages (including IPV4 and IPV6 protocols);

[0033] 2. Support clock frequency adjustment, support clock adjustment, clock is ns level;

[0034] 3. Support the time stamp function of receiving and sending messages;

[0035] 4. Support second pulse output function;

[0036] 5. Support second pulse time stamping function, and provide internal synchronization between clock PHY chips.

[0037] Clock HOLDOVER function: The ability of the device to maintain the maximum clock accuracy when the clock source is lost.

[0038] Overall plan:

[0039] The precise network synchronization protocol defined in the present invention realizes a high degree of synchronization in the network, so that no special synchronization communication is required when assigning control work, thereby achieving the effect of separating...

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Abstract

The invention discloses a realization method of a precision synchronous clock and aims at providing a transmission method of a precision synchronous clock in a measuring and automatic system based on an industrial Ethernet. The essential points of the technical scheme of the invention are that the realizing method comprises a frequency and deviation adjusting algorithm based on a fuzzy PID (Proportion Integration Differentiation), a quick internal clock synchronous algorithm, a real-time synchronous check method and a real-time clock frequency and time deviation adjusting algorithm. The invention has the following applications that the method can be used for realizing quick switch of the clock, can be applied to a high-reliability redundant clock source system and can finish the switch of the clock in ten seconds; the transmission precision of a single-stage clock can reach 50ns level; and since the algorithm can be used for realizing the quick switch of the clock, the algorithm is also applied to a high-reliability clock synchronous system under a redundant loop net and the clock HOLDOVER function on terminal equipment is degraded. The invention achieves the functions of software for receiving and transmitting a precision synchronous clock protocol message and adjusting and calibrating a system clock.

Description

Technical field [0001] The invention relates to the field of network communication, and more specifically, to a transmission method based on an industrial Ethernet precision synchronous clock in a measurement and automation system. Background technique [0002] Compared with other synchronization protocols commonly used in Ethernet TCP / IP networks, such as SNTP or NTP, the precision synchronization clock has the main difference: the precision synchronization clock is designed for a more stable and safer network environment, so it is simpler and more expensive. There are also fewer network and computing resources. In addition, because the precision clock uses hardware time stamping, it can accurately measure the message residence time of the switch and the link delay between the switches, and its synchronization accuracy is high, which is Level, and the stability of synchronization accuracy is also high. [0003] The precision synchronous clock is mainly aimed at relatively localiz...

Claims

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Application Information

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IPC IPC(8): H04L7/00H04L29/06H04J3/06
Inventor 马化一张国刚黄剑超
Owner KYLAND TECH CO LTD
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