Atomic clock 1PPS time synchronization method and system

A time synchronization system and time synchronization technology, applied in the direction of instruments using atomic clocks, etc., can solve the problems of inability to meet the requirements of chip atomic clock synchronization and frequency calibration, long-term aging drift, unfavorable practical applications, etc., to improve frequency accuracy and frequency stability. degree, fast convergence, and eliminate the effect of frequency drift

Active Publication Date: 2019-01-11
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Problems solved by technology

However, its frequency accuracy is 1E-10, which is still lower than the application requirements, and there are long-term aging drift problems
In the prior art, methods such as the time-amplitude conversion method and the TDC method are used to measure the time error data to calibrate the frequency accuracy of the chip atomic clock. However, due to the limitations of the existing method of measurement, it is impossible to meet the 1PPS of the chip atomic clock Synchronization and Frequency Calibration Requirements
To ensure the 1PPS synchronization and frequency calibration accuracy requirements of the chip atomic clock, it is necessary to use a primary frequency standard to calibrate it, which is not conducive to practical applications

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  • Atomic clock 1PPS time synchronization method and system
  • Atomic clock 1PPS time synchronization method and system
  • Atomic clock 1PPS time synchronization method and system

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Embodiment Construction

[0020] In order to make the technical solutions and advantages in the embodiments of the present application clearer, the exemplary embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only part of the embodiments of the present application, and Not an exhaustive list of all embodiments. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0021] The core idea of ​​this scheme is to remove the interference of the false 1PPS pulse signal on the synchronization process by judging and identifying the captured 1PPS pulse signal, and at the same time, overcome the long-term aging drift problem of the atomic clock through 1PPS failure maintenance, thereby improving the frequency stability of the atomic clock and frequency accuracy.

[0022] The proposal d...

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Abstract

An embodiment of the invention provides an atomic clock 1PPS time synchronization method. The method comprises the following steps of capturing a 1PPS pulse signal of an atomic clock; if the capturingfails, entering a 1PPS failure maintaining state, and if the capturing succeeds, judging whether the 1PPS pulse signal is a pseudo 1PPS pulse signal or not; and if the captured signal is the pseudo 1PPS pulse signal, re-capturing the 1PPS pulse signal, and if the captured pulse signal is not the pseudo 1PPS pulse signal, performing 1PPS time synchronization on the basis of a PID algorithm. According to the technical scheme, the captured 1PPS pulse signal is judged and recognized to remove the interference of the pseudo 1PPS pulse signal on the synchronization process, and meanwhile, the problem of long-term aging drift of the atomic clock is solved through the 1PPS failure maintaining, so that the frequency stability and the frequency accuracy of the atomic clock are improved.

Description

technical field [0001] This application relates to the application field of 1PPS signal synchronization and frequency calibration, and in particular to an atomic clock 1PPS time synchronization method and system suitable for autonomous navigation terminal equipment and high-precision time synchronization and maintenance equipment. Background technique [0002] As a secondary frequency standard, the chip atomic clock has good long-term frequency stability. However, its frequency accuracy is 1E-10, which is still lower than the application requirements, and there are long-term aging drift problems. In the prior art, methods such as the time-amplitude conversion method and the TDC method are used to measure the time error data to calibrate the frequency accuracy of the chip atomic clock. However, due to the limitations of the existing method of measurement, it is impossible to meet the 1PPS of the chip atomic clock Synchronization and frequency calibration requirements. To en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04F5/14
CPCG04F5/14
Inventor 张振伟
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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