Clock calibration method and device

A clock calibration and clock signal technology, applied in the field of communication, can solve the problems of large threshold, degraded clock system performance, and inability to filter interference signals.

Pending Publication Date: 2020-12-15
HYTERA COMM CORP
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Problems solved by technology

The inventors of the present application have found in long-term research and development that the method of setting thresholds is usually used to eliminate interference, that is, it is considered that the second pulse normally input to the system is periodic and will appear at a preset time and within the threshold range of standard time It is a normal signal, otherwise it is regarded as an interference signal and filtered; howev...

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  • Clock calibration method and device

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Embodiment Construction

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0019] At present, there are two main solutions to filter out interference signals. One is to generate a window-second pulse, such as figure 1 As shown, if the GPS second pulse is not within the window second pulse, it is considered to be an interference signal. In fact, the range it can filter is the pulse outside this window. If the interference signal is within the window second pulse, it cannot be filtered; The other is to use a counter to eliminate interf...

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Abstract

The invention discloses a clock calibration method and device. The clock calibration method comprises the following steps of: receiving a standard second pulse signal; acquiring a first local second pulse signal; acquiring a first phase difference between the first local second pulse signal and the standard second pulse signal; and acquiring a threshold value of a filtering phase difference according to the first phase difference, and filtering an interference signal in the standard second pulse signal by utilizing the threshold value of the filtering phase difference. By means of the clock calibration method, the threshold value of the filtering phase difference for filtering out the interference signals can be automatically adjusted, the influence of the interference signals is reduced,and the stability of the local clock is improved.

Description

technical field [0001] The present application relates to the technical field of communications, and in particular to a clock calibration method and device. Background technique [0002] The time reference of the communication system comes from GNSS (Global Navigation Satellite System, Global Navigation Satellite System), and satellite signals are susceptible to interference from weather, shelters, or electromagnetic fields. These interferences will cause the standard second pulse signal output by the GNSS chip to be unstable. Therefore, the communication In order to obtain a stable time reference and obtain better performance, the system must eliminate the interference of the standard second pulse. The inventors of the present application have found in long-term research and development that the method of setting thresholds is usually used to eliminate interference, that is, it is considered that the second pulse normally input to the system is periodic and will appear at a...

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Application Information

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IPC IPC(8): H04J3/06
CPCH04J3/0602H04J3/0617H04J3/0635
Inventor 张静杨小刚朱安华
Owner HYTERA COMM CORP
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