Time synchronization device and method based on precise time protocol

Abstract

The invention discloses a time synchronization device and method based on a precise time protocol. The device comprises a local clock oscillation source, a PTP (Peering to Peering) hardware auxiliary module, a PTP protocol processing module and a time regulation module, wherein the local clock oscillation source is used for generating a local clock signal; the PTP hardware auxiliary module is used for capturing a PTP message input through an Ethernet physical layer chip, and recording a local time stamp of the local clock signal at the moment; the PTP protocol processing module is used for analyzing the PTP message and acquiring a main clock time stamp of a main clock signal; and the time regulation module is used for regulating the local clock signal according to the difference value of the local time stamp and the main clock time stamp so as to synchronize the local clock signal with the main clock signal. According to the device and the method, an IEEE1588 clock message signal is adopted as an input source, and the synchronous time precision between the local clock time and the PTP main clock time is not greater than 10 microseconds, so that the synchronization precision requirements of various application situations and various systems are met.

Description

technical field [0001] The invention relates to a network time synchronization device, in particular to a time synchronization device and method based on the precise time protocol. Background technique [0002] At present, various systems based on precise time protocols are widely used in various industries, such as communication systems, power systems, transportation systems, financial systems, etc., for example: [0003] In the communication system, with the evolution of the communication network from the traditional method to the PTN network, the system's requirements for network time synchronization are further improved. For example, LTE's requirement for network clock synchronization reaches 2 microseconds. As we all know, there is a possibility of failure in any wired or wireless method, which will cause deviations in network time synchronization. Since the LTE communication system has very high requirements for time synchronization, once a time synchronization deviati...

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Problems solved by technology

[0008] (1) Since GPS is a global satellite navigation system controlled by the US military, it is controlled by the US military and has no guarantee;

[0009] (2) The maintenance cost of antenna and feeder lines is high, and lightning protection and waterproof measures are required. In cities with complex wireless signals, power equipment, and surrounding rail transit equipment, it is also vulnerable to wireless interference;

[0010] (3) There are many high-rise buildings in the city, and the field of view of satellite reception is limited, so it is difficult to ensure continuous reception of sufficient satellite signals

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