A Time Autonomous Synchronization Method for a Unified Time System Without Traceable Reference Conditions

A system time and time technology, applied in the direction of synchronization, clocks driven by synchronous motors, electronic timers, etc., can solve problems such as system failure and deviation

Active Publication Date: 2021-02-26
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Problems solved by technology

However, when the traceability reference time is abnormal and the time difference data cannot be provided, due to the inherent frequency drift characteristic of the frequency standard in the time system, if it is not adjusted and controlled, the time output by the time unification system will gradually deviate from the traceability reference time, resulting in system failure

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  • A Time Autonomous Synchronization Method for a Unified Time System Without Traceable Reference Conditions

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0029] The technical feature of the present invention is that by accurately measuring the frequency stability and drift characteristics of the frequency standard in the time unification system, while maintaining the stability characteristics of the frequency standard itself, it is ensured that the time unification system maintains and traces the source under the condition of an abnormal traceability link. High-precision synchronization of reference time.

[0030] The technical solution adopted by the present invention to solve its technical problems comprises the following steps:

[0031] Step 1: Send the frequency standard (atomic clock) needed to build a unified time system to a time laboratory or a national first-level time measurement unit that maintains UTC(k), and the...

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Abstract

The invention provides a method for autonomous time synchronization of a time unified system under the condition of no traceable reference, and measures the time difference data between the output time of the time unified system and the traceable reference; if the system is normal, the least squares fitting is performed on the time difference data to predict The difference between the system output time and the traceability reference time at one hour, the frequency control amount is calculated according to the fitting function of the time difference data, and the frequency of the frequency standard is adjusted; if the system is abnormal, the time difference data sequence is obtained by the least square method The fitting function is used to predict the time difference between the output time of the time unified system and the traceability reference time in the next adjustment cycle, and then calculate the frequency adjustment increment. The present invention can still maintain high-precision synchronization with the traceability reference time under the condition that the time traceability equipment is abnormal.

Description

technical field [0001] The invention relates to a method for autonomously synchronizing the time-frequency signal of a time unification system with the traceable reference time under the condition of no time traceable reference. Background technique [0002] The time unified system is a complete system composed of various electronic devices that provides traceable reference time signals and standard frequency signals to achieve high-precision synchronization of time and frequency of the entire system, referred to as "time system". Time system is generally composed of frequency standard, phase trimmer, time transfer receiver, time interval counter, digital clock, time-frequency signal distributor and control computer. High-precision time unification systems are generally equipped with atomic clocks as frequency standards. When the atomic clock oscillates freely, due to its inherent frequency aging characteristics or the influence of other environmental factors, the time and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G04F5/14G04G7/00
CPCG04F5/14G04G7/00
Inventor 王文利李雨薇赵志雄刘娅孟令达樊多盛
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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