Multi-path phase comparison measurement system and method

Abstract

The invention mainly relates to the technical field of frequency measurement, and provides a multi-path phase comparison measurement system and method. The system mainly comprises a first output module used for outputting a reference frequency standard signal, a plurality of second output modules for outputting a measured frequency standard signal, a plurality of time interval counters, a frequency distribution amplifier and a data processing module. The system is mainly based on a phase comparison measurement algorithm of a phase difference measurement function of the plurality of time interval counters, phase differences between a plurality of measured frequency standard output signals and a reference frequency scale signal are measured, and the data processing module calculates to obtain daily average relative frequency deviation according to the phase difference value and calculates to obtain frequency characteristic parameters such as the relative frequency deviation, the frequency drift rate and the daily frequency stability, so that metering of long-term characteristics of frequency standards such as cesium atoms, rubidium atoms and quartz crystals is realized, and the reliability and accuracy of frequency standard calibration are improved.

Description

technical field [0001] The invention relates to the technical field of frequency measurement, in particular to a multi-channel phase comparison measurement system and method. Background technique [0002] Time is one of the seven basic physical quantities in the International System of Units, and it is of undoubted importance. One of the main tasks of time-frequency measurement is to verify various characteristics of frequency standards. The frequency standard commonly used at present is rubidium atom Frequency standard, its main frequency performance indicators include long-term performance and short-term performance. The common equipment for long-term performance testing of rubidium atomic frequency standards is a phase comparator. The basic principle is to measure the standard frequency standard signal and the measured frequency standard signal through the time interval counter. The phase difference of these two signals can obtain the relative frequency deviation of the m...

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Problems solved by technology

[0003] Based on the above-mentioned technical problems in the prior art, the present invention provides a multi-channel phase comparison system, which uses the adjacent point threshold judgment algorithm to accurately measure the relative frequency deviation between the measured signal and the standard signal, and solves the problems in the prior art. The existing technical problem of "period ambiguity" improves the accuracy of frequency standard calibration

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