Multi-reference seamless switching phase locking device

Abstract

The invention discloses a multi-reference seamless switching phase locking device which is characterized by comprising a reference input module, a frequency division module, a phase measurement module, a weighting processing module and a phase locking module. Reference sources provide input signals of different frequencies; the frequency division module divides input reference signals into corresponding 1pps signals and sends the 1pps signals to the phase measurement module; the phase measurement module receives the 1pps signals sent by the frequency division module, compares the 1pps signals with Local_pps signals provided by the phase locking module and works out the phase difference between the Local_pps signals and the 1pps signals; the weighting processing module receives the phase difference measured through the phase measurement module, performs weighting processing on the phase difference and sends the phase difference to the phase locking module; and the phase locking module works out frequency differences according to phase accumulated values and outputs Local_10 Mhz signals and Local_pps signals. The multi-reference seamless switching phase locking device can achieve seamless switching between the reference sources by optimal utilization of various reference sources of different types, and high-precision time references and frequency references are provided for a system.

Description

technical field [0001] The invention relates to a phase locking device, in particular to a multi-reference seamless switching phase locking device. Background technique [0002] Complex large-scale equipment needs a high-precision unified time reference when coordinating work. Usually, the GPS / Beidou system is used as a reference source, and the local crystal oscillator / rubidium clock is tamed to obtain the standard time, high-precision clock frequency, 1PPS, etc. required by the equipment, but GPS / Beidou sometimes cannot work normally due to location reasons, weather reasons, etc. At this time, the time reference system works in a free running state, and key system indicators such as frequency accuracy and synchronization accuracy cannot be guaranteed. [0003] In order to improve the accuracy, stability and reliability of the time reference, multiple reference sources are usually configured for the time reference system, including GPS / Beidou system, external 1M / 5M / 10M cl...

AI Technical Summary

Problems solved by technology

However, in the long-term operation process, there are problems such as the addition of new reference sources, the exit of old reference sources, and the decline in the quality of reference sources. Changes in reference sources will lead to poorer accuracy and stability of the clock frequency provided by the time reference system. , phase discontinuity and other issues

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