High-resolution transient frequency stability measuring method

A technology of frequency stability and high resolution, applied in the field of transient stability measurement, can solve the problem of measurement resolution reduction and achieve the effect of fast response time and high resolution

Active Publication Date: 2013-12-25
XIDIAN UNIV
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Problems solved by technology

A shorter gate will significantly reduce the measurement resolution. For example, for a measured frequency of 10MHz, only 10 numbers can be counted within a gate time of 1μs. It is difficult to talk about the problem of accuracy.

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  • High-resolution transient frequency stability measuring method
  • High-resolution transient frequency stability measuring method
  • High-resolution transient frequency stability measuring method

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] figure 1 It is a block schematic diagram for measuring the transient frequency stability of two frequency sources with the same frequency nominal value. Firstly, the phase difference between the measured signal and the reference signal is adjusted to the coincidence detection circuit by measuring and adjusting the phase difference between the signals. at the edge of the detection resolution. Transient frequency stability is calculated based on the discontinuity of detected coincidence information. The frequency values ​​of the two signals can be equal or in multiples. In this way, multiple frequencies can be measured with high precision under the condition of a frequency nominal value frequency standard. Through mutual frequency division, the measurement range can be further broadened.

[0020] The actual phase coincidence detection line sens...

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Abstract

The invention provides a high-resolution transient frequency stability measuring method. The method comprises: first of all, the phase difference value between a reference signal and a detected signal is measured and adjusted so as to enable the value to be stabilized at the edge of a superposed detection resolution, if there are no effects of noise, the continuous detection of superposed information can be maintained, however, if there is signal noise, the phase difference change between the signals is between the inside of an edge and the outside of the edge, and the presence of phase superposed information remains variable, therefore, the phase instability degrees of the signals can be determined according to the continuity and interruption situations of the superposed information, and by detecting the change amount of the phase difference between the signals before and after a sampling time, the transient stabilization degree of a frequency source can be calculated through a formula derived from the Allan variance calculation formula.

Description

technical field [0001] The invention belongs to the field of frequency stability measurement, and relates to the measurement of high-resolution transient stability of a frequency source, in particular to the measurement of high-resolution transient stability based on a phase coincidence detection array. Background technique [0002] Frequency stability measurement refers to the measurement of the random fluctuation characteristics of the output frequency value of the frequency source. Frequency stability can be characterized in two ways, time domain and frequency domain. Many methods of counting measurement are used in time-domain frequency stability measurement, and the measurement gate width usually formed is generally from 1ms to 10s. A shorter gate will significantly reduce the measurement resolution. For example, for a measured frequency of 10MHz, only 10 numbers can be counted within a gate time of 1μs, so it is difficult to talk about the problem of accuracy. Howeve...

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Application Information

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IPC IPC(8): G01R23/02
Inventor 白丽娜周渭李智奇宋慧敏宣宗强于建国高建宁张雪萍叶云霞
Owner XIDIAN UNIV
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