Digital frequency stability measuring method based on total response time

Abstract

The invention discloses a digital frequency stability measuring method based on total response time. In a digital environment, quantization error in the digital measurement technology is inhibited by use of a clock vernier effect and a digital edge effect, the phase difference between two signals is measured through a digital phase discrimination algorithm, the frequency stability is obtained according to the phase difference, and thus, frequency stability measurement based on total response time is realized. The method can be used to accurately measure the transient stability, short-term stability and long-term stability of different frequency sources and essentially reveal the change rule of the frequency stability of different frequency sources with response time.

Description

technical field [0001] The present invention relates to the measurement technology of frequency and frequency stability, especially the frequency stability measurement of the full response time of different frequency sources. Widely used in communications, electronic engineering, navigation and positioning, time-frequency fields, etc. Background technique [0002] There are many traditional frequency stability measurement methods, such as phase coincidence method through phase difference measurement, time interval measurement and double-mixing time difference method, beat method through frequency measurement, frequency multiplication method and analog interpolation method, etc. These measurements Most of the methods are based on gate counting, which can only measure the frequency stability of ms and above, and most of them are measured by counting gates in a simulated environment. Although a certain measurement accuracy can be achieved, there is a single-point zero-crossing ...

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Problems solved by technology

[0002] There are many traditional frequency stability measurement methods, such as phase coincidence method through phase difference measurement, time interval measurement and double mixing time difference method, beat method through frequency measurement, frequency multiplication method and analog interpolation method, etc. These measurements Most of the methods are based on gate counting, which can only measure the frequency stability of ms and above, and most of them are measured by counting gates in a simulated environment. Although a certain measurement accuracy can be achieved, there is a single-point zero-crossing detection that is sensitive to noise, Strict requirements on line performance, limited line resolution, etc., and because the counting gate cannot be too short, it is impossible to obtain a shorter time frequency stability index, but these shorter time frequency stability measurements are for the jitter of the frequency source, The description of real-time short-term instability and far-end phase noise plays an important role

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