CN103293376A - Frequency stability measuring method and device - Google Patents
Frequency stability measuring method and device Download PDFInfo
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- CN103293376A CN103293376A CN2013102152536A CN201310215253A CN103293376A CN 103293376 A CN103293376 A CN 103293376A CN 2013102152536 A CN2013102152536 A CN 2013102152536A CN 201310215253 A CN201310215253 A CN 201310215253A CN 103293376 A CN103293376 A CN 103293376A
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Abstract
The invention discloses a frequency stability measuring method and device, and belongs to the technical field of electronics. The method includes: performing frequency conversion on an output signal of a measured signal source to obtain a first frequency signal; taking a first frequency signal as a reference signal, taking a set multiple of the frequency of the first frequency signal as a measuring bandwidth, and then measuring the frequency of the first frequency signal; computing short-term frequency stability of the measured signal source by adopting the frequency of the first frequency signal and according to a first variance formula; performing frequency conversion on the output signal of the measured signal source to obtain a second frequency signal; taking a second reference signal as a reference signal to measure the frequency of the second frequency signal; and computing long-term frequency stability of the measured signal source by adopting the frequency of the second frequency signal and according to a second variance formula. When the short-term frequency stability is measured, the measuring bandwidth for counting and measuring is controlled, and accordingly accuracy of short-term frequency stability measurement is improved.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of frequency stability measurement method and apparatus.
Background technology
Along with the high speed development of modern society, the application of split-second precision frequency technique more and more widely, people are also more and more higher to the stability requirement of the temporal frequency in clock source output.Usually, the stability in clock source adopts frequency stability to weigh.
Existing a kind of survey frequency stable measurement method, this method comprises: the output signal in measured signal source is carried out frequency division handle; In setting-up time, the pulse number of the output signal in the measured signal source behind reference signal and the frequency division is counted; Calculate the frequency of measured signal according to pulse number; According to the normalized form of output signal frequency and the frequency stability in measured signal source, calculate the frequency stability in measured signal source.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
Usually adopt the standard variance formula to calculate the frequency stability of signal source in the prior art; yet; find after deliberation; a signal source has two degree of stability indexs usually; these two degree of stability indexs are respectively short-term frequency stability and long-term frequency stability; wherein; what short-term frequency stability characterized is the jitter level of signal; what long-term frequency stability characterized is signal frequency drift degree in time; therefore, to weigh the performance of a signal source be not accurate enough to the frequency stability that available technology adopting is single.
Summary of the invention
Adopt single frequency stability to weigh the not accurate enough problem of performance of a signal source in order to solve prior art, the embodiment of the invention provides a kind of frequency stability measurement method and apparatus.Described technical scheme is as follows:
On the one hand, the embodiment of the invention provides a kind of frequency stability measurement method, and described method comprises:
Output signal to the measured signal source is carried out frequency inverted, obtains the first frequency signal;
Be reference signal with first reference signal, and serve as to measure bandwidth with the setting multiple of described first frequency signal frequency, measure the frequency of described first frequency signal;
Adopt the frequency of described first frequency signal, determine the short-term frequency stability in described measured signal source according to the first variance formula;
Output signal to described measured signal source is carried out frequency inverted, obtains the second frequency signal;
Be reference signal with second reference signal, measure the frequency of described second frequency signal;
Adopt the frequency of described second frequency signal, determine the long-term frequency stability in described measured signal source according to the second variance formula.
Alternatively, described setting multiple is 1-5 times.
Particularly, described is reference signal with second reference signal, measures the frequency of described second frequency signal, comprising:
The instantaneous phase of gathering described second frequency signal and the 3rd reference signal is poor, obtains the digital signal that the described phase differential of expression changes;
Described digital signal is carried out integration, obtain d. c. voltage signal;
Described d. c. voltage signal is carried out analog to digital conversion, obtain the phase differential of described second frequency signal and described the 3rd reference signal;
According to described phase differential and described the 3rd reference signal, determine the frequency of described second frequency signal.
Preferably, described first variance formula is the Allan variance formula, and described second variance formula is the Hadamard formula of variance.
On the other hand, the embodiment of the invention provides a kind of frequency stability measurement device, and described device comprises:
Be used for the output signal in measured signal source is carried out frequency inverted, obtain the first frequency modular converter of first frequency signal;
Be used for the output signal in described measured signal source is carried out frequency inverted, obtain the second frequency modular converter of second frequency signal;
Being used for first reference signal is reference signal, serves as to measure bandwidth with the setting multiple of the frequency of described first frequency signal, measures first measurement module of the frequency of the first frequency signal that described first frequency handover module obtains;
Being used for second reference signal is reference signal, measures second measurement module of the frequency of the described second frequency signal that described second frequency handover module obtains; And
Frequency for the described first frequency signal that adopts described first measurement module to record, determine the short-term frequency stability in described measured signal source according to the first variance formula, adopt the frequency of the described second frequency signal that described second measurement module records, determine the processing module of the long-term frequency stability in described measured signal source according to the second variance formula;
Described first frequency modular converter is electrically connected with described first measurement module, described processing module respectively, described second frequency modular converter is electrically connected with described second measurement module, described processing module respectively, and described processing module is electrically connected with described first measurement module, described second measurement module respectively.
Alternatively, described setting multiple is 1-5 times.
Particularly, described second measurement module comprises:
The phase differential collecting unit that is used for the instantaneous phase difference of the described second frequency signal of collection and the 3rd reference signal;
Be used for digital signal is carried out integration, obtain the integrating circuit of d. c. voltage signal, to be described processing module obtain according to the instantaneous phase difference of described second frequency signal and the 3rd reference signal described digital signal;
Be used for described d. c. voltage signal is carried out analog to digital conversion, obtain the AD conversion unit of the phase differential of described second frequency signal and described the 3rd reference signal;
Correspondingly, described processing module is used for,
According to described phase differential and described the 3rd reference signal that described AD conversion unit obtains, determine the frequency of described second frequency signal.
Alternatively, described first frequency modular converter and described second frequency modular converter are same module.
Alternatively, described device also comprises be used to first signal source that described first reference signal is provided with for the secondary signal source that described second reference signal is provided, described first signal source is electrically connected with described first frequency modular converter, described first measurement module respectively, and first signal source is crystal oscillator; Described secondary signal source is electrically connected with described second frequency modular converter, described second measurement module respectively, and the secondary signal source is atomic clock.
Preferably, described first variance formula is the Allan variance formula, and described second variance formula is the Hadamard formula of variance.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is:
Measure respectively by short-term frequency stability and long-term frequency stability to the measured signal source, adopt two frequency stabilities to weigh the performance of a signal source, accuracy height.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the process flow diagram of a kind of frequency stability measurement method of providing of the embodiment of the invention one;
Fig. 2 be the embodiment of the invention one provide the process flow diagram of frequency inverted is carried out in measured signal;
Fig. 3 is the process flow diagram that second frequency signal and the 3rd reference signal are carried out bit comparison mutually that the embodiment of the invention one provides;
Fig. 4 is the measurement bandwidth that provides of the embodiment of the invention and the graph of a relation of frequency stability;
Fig. 5 is the structural representation of a kind of frequency stability measurement device of providing of the embodiment of the invention two;
Fig. 6 is the structural representation of the frequency translation module that provides of the embodiment of the invention two;
Fig. 7 is the structural representation of the phase bits comparison module that provides of the embodiment of the invention two.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Embodiment one
The embodiment of the invention provides a kind of frequency stability measurement method, and referring to Fig. 1, this method comprises:
Step 101: the output signal to the measured signal source is carried out frequency inverted, obtains the first frequency signal.
By frequency inverted, the output signal in measured signal source can be converted to low frequency signal, be convenient to measure.Simultaneously, can make the frequency range in the suitable measured signal source of the embodiment of the invention wider.
In this step 101, when the output signal in measured signal source is carried out frequency inverted, can adopt the output signal (as first reference signal in the embodiment of the invention) in the high clock source (such as VCXO) of short-term frequency stability as time-base signal, also can adopt the output signal (as second reference signal in the embodiment of the invention) in the high clock source (such as atomic clock) of long-term frequency stability as time-base signal.
Particularly, referring to Fig. 2, this step 101 can comprise:
Step 1011: be time-base signal with first reference signal or second reference signal, the output signal in measured signal source is carried out count measurement, obtain the output signal frequency in measured signal source.
More specifically, this step 1011 comprises:
Be time-base signal with first reference signal or second reference signal, measure the pulse number of the output signal in measured signal source in the given time, and calculate the frequency of measured signal according to following formula (1):
F=1/(T/N) （1）；
Wherein, F is the output signal frequency in measured signal source, and T is the given time, and N is the pulse number of the output signal in the measured signal source that records.
Step 1012: according to the output signal frequency in measured signal source, produce the 3rd frequency signal, the frequency of the 3rd frequency signal is and the immediate integer frequency of the output signal frequency in measured signal source.
In the present embodiment, this integer frequency can be with the MHz(megahertz) be unit.
Step 1013: the 3rd frequency signal is carried out frequency multiplication, obtain the first frequency signal.
Step 102: be reference signal with first reference signal, and serve as to measure bandwidth with the setting multiple of first frequency signal frequency, measure the frequency of first frequency signal.
Wherein, measure bandwidth and be the scope of the frequency of the first frequency signal that can measure, the measurement bandwidth is that the setting multiple of first frequency signal frequency is represented only the signal in the setting multiple scope of first frequency signal frequency to be measured, as the equipment multiple of measuring bandwidth is 5, then at most only the quintuple harmonics of first frequency signal is measured, be equivalent to first frequency signal intermediate frequency rate has been carried out filtering greater than the part of quintuple harmonics, improved the accuracy of measuring.
Particularly, the scope of setting multiple can be 1-5 times.
Preferably, the scope of setting multiple is generally 1 times, 2.5 times or 5 times.For instance, if the first frequency signal frequency is the 1KHz(KHz), measure bandwidth so and can be 1KHz, 2.5KHz or 5KHz.
Particularly, this step 102 can comprise: first signal is carried out low-pass filtering, and filtering bandwidth is measured bandwidth for this; Be time-base signal with first reference signal, measure the pulse number of the output signal in measured signal source in the given time, and calculate the frequency of measured signal according to formula (1).
Step 103: adopt the frequency of first frequency signal, calculate the short-term frequency stability in measured signal source according to the first variance formula.
Alternatively, the first variance formula can be the Allan variance formula, and Allan variance formula (2) is as follows:
Wherein, σ
yBe the Allan variance value, τ is sampling period and sampling time, f
hBe the higher cutoff frequency of signal source, N is number of samples,
Y is the relative frequency deviation of each sampling time output frequency, and f0 is the frequency of reference signal, f
iOutput signal frequency for the measured signal source.
Step 104: the output signal to the measured signal source is carried out frequency inverted, obtains the second frequency signal.
In this step 104, when the output signal in measured signal source is carried out frequency inverted, can adopt the output signal (as first reference signal in the embodiment of the invention) in the high clock source (such as VCXO) of short-term frequency stability as time-base signal, also can adopt the output signal (as second reference signal in the embodiment of the invention) in the high clock source (such as atomic clock) of long-term frequency stability as time-base signal.
Particularly, this step 104 can comprise: be time-base signal with first reference signal or second reference signal, the output signal in measured signal source is carried out count measurement, obtain the output signal frequency in measured signal source; According to the output signal frequency in measured signal source, produce the 4th frequency signal, the frequency of the 4th frequency signal is and the immediate integer frequency of the output signal frequency in measured signal source; The 4th frequency signal is carried out frequency multiplication, produce the second frequency signal.
Step 105: be reference signal with second reference signal, measure the frequency of second frequency signal.
Particularly, referring to Fig. 3, this step 105 comprises:
Step 1051: the instantaneous phase of gathering second frequency signal and the 3rd reference signal is poor, obtains the digital signal that the expression phase differential changes.
Preferably, can trigger collection to the instantaneous phase difference of second frequency signal and the 3rd reference signal with the rising edge of signal.
Alternatively, digital signal is the digital square-wave of the phase differential variation of expression second frequency signal and the 3rd reference signal.
Step 1052: digital signal is carried out integration, obtain d. c. voltage signal.
Step 1053: d. c. voltage signal is carried out analog to digital conversion, obtain second frequency signal and the 3rd reference signal phase differential.
Step 1054: according to phase differential and the 3rd reference signal, obtain the frequency of second frequency signal.
Step 106: adopt the frequency of second frequency signal, calculate the long-term stability in measured signal source according to the second variance formula.
Particularly, the second variance formula can be the Allan variance formula, also can be the Hadamard formula of variance; Be preferably the Hadamard formula of variance, Hadamard formula of variance (3) is as follows:
Wherein, H σ
yBe the Hadamard variance yields, τ is the sampling time, and m is number of samples, y
kRelative frequency deviation for output frequency.
In the Hadamard formula of variance (3), y
K+2-2*y
K+1+ y
k=(y
K+2-y
K+1)-(y
K+1-y
k), because previous bracket (y
K+2-y
K+1) in include frequency drift to the influence of frequency stability, a back bracket (y
K+1-y
k) in also include the influence of frequency drift, therefore previous bracket and a back bracket subtract each other, and can eliminate frequency drift to the influence of frequency stability.
Simply introduce the relation of measuring bandwidth and frequency stability below in conjunction with Fig. 4, as shown in Figure 4, what the longitudinal axis was represented is degree of stability, and what transverse axis was represented is the sampling time, and three curves among the figure are respectively measured frequency stabilities under different measurement bandwidth.As shown in Figure 1, when sampling time during less than 1s, frequency stability is with to measure bandwidth relevant, and when employing time during greater than 1s, frequency stability is basic with to measure bandwidth irrelevant.Because when carrying out the short-term frequency stability measurement, the employing time is generally less than 1s, when carrying out the long-term frequency stability measurement, the employing time is generally greater than 1s, the embodiment of the invention has been carried out bandwidth control when carrying out the short-term frequency stability measurement, therefore the frequency stability accuracy height that records.
The embodiment of the invention is measured respectively by short-term frequency stability and long-term frequency stability to the measured signal source, adopts two frequency stabilities to weigh the performance of a signal source, accuracy height.And when measuring the short-term frequency stabilization, control measuring bandwidth, considered the relation between short-term frequency stability and the measurement bandwidth, improved the accuracy of measuring short-term frequency stability.
Embodiment two
The embodiment of the invention provides a kind of frequency stability measurement device, and referring to Fig. 5, this device comprises first frequency modular converter 1, second frequency modular converter 2, first measurement module 3, second measurement module 4 and processing module 5.First frequency modular converter 1 is used for the output signal in measured signal source is carried out frequency inverted, obtains the first frequency signal.Second frequency modular converter 2 is used for the output signal in measured signal source is carried out frequency inverted, obtains the second frequency signal.It is reference signal that first measurement module 3 is used for first reference signal, serves as to measure bandwidth with the setting multiple of the frequency of first frequency signal, measures the frequency of the first frequency signal that first frequency modular converter 1 obtains.It is reference signal that second measurement module 4 is used for the second frequency signal, measures the frequency of the second frequency signal of second frequency modular converter 2 acquisitions.Processing module 5 is for the frequency of the first frequency signal that adopts first measurement module 3 to record, determine the short-term frequency stability in measured signal source according to the first variance formula, adopt the frequency of the second frequency signal that second measurement module records, determine the long-term frequency stability in measured signal source according to the second variance formula.
Wherein, first frequency modular converter 1 is electrically connected with first measurement module 3, processing module 5 respectively, second frequency modular converter 2 is electrically connected with second measurement module 4, processing module 5 respectively, and processing module 5 is electrically connected with first measurement module 3, second measurement module 4 respectively.
Alternatively, this setting multiple can be 1-5 times.
Alternatively, first frequency modular converter 1 and second frequency modular converter 2 can be same module.
Alternatively, this device can also comprise that be used to first signal source that first reference signal is provided first signal source is electrically connected with first frequency modular converter 1, first measurement module 3 respectively.
Particularly, first signal source can be crystal oscillator.
Alternatively, this device can also comprise that be used to the secondary signal source that second reference signal is provided the secondary signal source is electrically connected with second frequency modular converter 2, second measurement module 4 respectively.
Particularly, the secondary signal source can be atomic clock, as hydrogen atomic clock, rubidium atomic clock or cesium-beam atomic clock.
Preferably, this device can also comprise for second reference signal is carried out frequency division, obtains the DDS(Direct Digital Synthesizer of the 3rd reference signal, Direct Digital Synthesizer).
Particularly, processing module 5 can comprise central processing unit, single-chip microcomputer, microcontroller or microprocessor.
Particularly, referring to Fig. 6, counting unit 11, DDS12 and PLL(Phase Locked Loop when first frequency modular converter 1 comprises walking, phaselocked loop) 13.Counting unit 11 is carried out count measurement for being reference signal with first reference signal or second reference signal to the output signal in measured signal source when walking, and obtains the output signal frequency in measured signal source.DDS12 is used for producing the 3rd frequency signal under the control of control module 5, the immediate integer frequency of output signal frequency in the measured signal source that the frequency of the 3rd frequency signal obtains for counting unit 11 when walking.PLL13 is used for the 3rd frequency signal that DDS12 produces is carried out frequency multiplication, produces the first frequency signal.Counting unit 11 is electrically connected with DDS12 by processing module 5 when walking.PLL13 is electrically connected with DDS12, processing module 5 respectively.
More specifically, the frequency multiplication ratio of the frequency of the frequency signal of DDS12 acquisition and PLL13 is by processing module 5 controls.Processing module 5 can be by sending command control word to DDS12, rewrite the internal frequency register of DDS12, make the frequency signal of the immediate integer of measured signal frequency that the DDS12 output frequency obtains for counting unit when walking 11, the measured signal frequency that command control word is processing module 5 counting unit 11 obtains when walking obtains.As the frequency that counting unit 11 obtains measured signals when walking is 11.0592MHz, it is 11MHz that processing module 5 obtains with the immediate integer of frequency according to this frequency, processing module 5 sends the command control word corresponding with 11MHz to DDS12, rewritten the internal frequency register of DDS12, making the DDS12 output frequency is the frequency signal of 11MHz.PLL13 is according to the frequency multiplication ratio of processing module 5, and the frequency signal of 11MHz is carried out frequency multiplication, obtains the frequency signal of required frequency, as the frequency signal of 1KHz.
Counting unit 21, DDS22 and PLL23 when correspondingly, first frequency modular converter 2 comprises walking.Counting unit 21 is carried out count measurement for being reference signal with first reference signal or second reference signal to the output signal in measured signal source when walking, and obtains the output signal frequency in measured signal source.DDS22 is used for producing the 4th frequency signal under the control of control module 5, the immediate integer frequency of output signal frequency in the measured signal source that the frequency of the 4th frequency signal records for counting unit 21 when walking.PLL23 is used for the 4th frequency signal that DDS22 produces is carried out frequency multiplication, produces the second frequency signal.Counting unit 21 is electrically connected with DDS22 by processing module 5 when walking.PLL23 is electrically connected with DDS22, processing module 5 respectively.
Particularly, referring to Fig. 7, second measurement module 4 comprises phase differential collecting unit 41, integrating circuit 42 and AD conversion unit 43.Phase differential collecting unit 41 is for the phase differential collecting unit 41 of the instantaneous phase difference of gathering second frequency signal and the 3rd reference signal, for digital signal is carried out integration, obtain the integrating circuit 42 of d. c. voltage signal and carry out analog to digital conversion for the d. c. voltage signal that integrating circuit 42 is obtained, obtain the AD conversion unit 43 of the phase differential of second frequency signal and the 3rd reference signal.Phase place collecting unit 41 is electrically connected with second frequency modular converter 2.Phase place collecting unit 41 is electrically connected with integrating circuit 42 by processing module 5.Integrating circuit 42 and AD conversion unit 43 are electrically connected.AD conversion unit 43 is electrically connected with processing module 5.
Wherein, digital signal is that processing module 5 is according to the instantaneous phase difference acquisition of second frequency signal and the 3rd reference signal.
Correspondingly, processing module 5 is used for, and according to phase differential and the 3rd reference signal that AD conversion unit 3 obtains, determines the frequency of second frequency signal.
The embodiment of the invention is measured respectively by short-term frequency stability and long-term frequency stability to the measured signal source, adopts two frequency stabilities to weigh the performance of a signal source, accuracy height.And when measuring the short-term frequency stabilization, control measuring bandwidth, considered the relation between short-term frequency stability and the measurement bandwidth, improved the accuracy of measuring short-term frequency stability.
The invention described above embodiment sequence number does not represent the quality of embodiment just to description.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a frequency stability measurement method is characterized in that, described method comprises:
Output signal to the measured signal source is carried out frequency inverted, obtains the first frequency signal;
Be reference signal with first reference signal, and serve as to measure bandwidth with the setting multiple of described first frequency signal frequency, measure the frequency of described first frequency signal;
Adopt the frequency of described first frequency signal, determine the short-term frequency stability in described measured signal source according to the first variance formula;
Output signal to described measured signal source is carried out frequency inverted, obtains the second frequency signal;
Be reference signal with second reference signal, measure the frequency of described second frequency signal;
Adopt the frequency of described second frequency signal, determine the long-term frequency stability in described measured signal source according to the second variance formula.
2. method according to claim 1 is characterized in that, described setting multiple is 1-5 times.
3. method according to claim 1 is characterized in that, described is reference signal with second reference signal, measures the frequency of described second frequency signal, comprising:
The instantaneous phase of gathering described second frequency signal and the 3rd reference signal is poor, obtains the digital signal that the described phase differential of expression changes;
Described digital signal is carried out integration, obtain d. c. voltage signal;
Described d. c. voltage signal is carried out analog to digital conversion, obtain the phase differential of described second frequency signal and described the 3rd reference signal;
According to described phase differential and described the 3rd reference signal, determine the frequency of described second frequency signal.
4. according to each described method of claim 1-4, it is characterized in that described first variance formula is the Allan variance formula, described second variance formula is the Hadamard formula of variance.
5. a frequency stability measurement device is characterized in that, described device comprises:
Be used for the output signal in measured signal source is carried out frequency inverted, obtain the first frequency modular converter of first frequency signal;
Be used for the output signal in described measured signal source is carried out frequency inverted, obtain the second frequency modular converter of second frequency signal;
Being used for first reference signal is reference signal, serves as to measure bandwidth with the setting multiple of the frequency of described first frequency signal, measures first measurement module of the frequency of the first frequency signal that described first frequency handover module obtains;
Being used for second reference signal is reference signal, measures second measurement module of the frequency of the described second frequency signal that described second frequency handover module obtains; And
Frequency for the described first frequency signal that adopts described first measurement module to record, determine the short-term frequency stability in described measured signal source according to the first variance formula, adopt the frequency of the described second frequency signal that described second measurement module records, determine the processing module of the long-term frequency stability in described measured signal source according to the second variance formula;
Described first frequency modular converter is electrically connected with described first measurement module, described processing module respectively, described second frequency modular converter is electrically connected with described second measurement module, described processing module respectively, and described processing module is electrically connected with described first measurement module, described second measurement module respectively.
6. device according to claim 5 is characterized in that, described setting multiple is 1-5 times.
7. device according to claim 5 is characterized in that, described second measurement module comprises:
The phase differential collecting unit that is used for the instantaneous phase difference of the described second frequency signal of collection and the 3rd reference signal;
Be used for digital signal is carried out integration, obtain the integrating circuit of d. c. voltage signal, to be described processing module obtain according to the instantaneous phase difference of described second frequency signal and the 3rd reference signal described digital signal;
Be used for described d. c. voltage signal is carried out analog to digital conversion, obtain the AD conversion unit of the phase differential of described second frequency signal and described the 3rd reference signal;
Correspondingly, described processing module is used for,
According to described phase differential and described the 3rd reference signal that described AD conversion unit obtains, determine the frequency of described second frequency signal.
8. device according to claim 5 is characterized in that, described first frequency modular converter and described second frequency modular converter are same module.
9. according to each described device of claim 5-8, it is characterized in that, described device also comprises be used to first signal source that described first reference signal is provided with for the secondary signal source that described second reference signal is provided, described first signal source is electrically connected with described first frequency modular converter, described first measurement module respectively, and first signal source is crystal oscillator; Described secondary signal source is electrically connected with described second frequency modular converter, described second measurement module respectively, and the secondary signal source is atomic clock.
10. according to each described device of claim 5-8, it is characterized in that described first variance formula is the Allan variance formula, described second variance formula is the Hadamard formula of variance.
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| CN103472330B (en) * | 2013-09-13 | 2015-11-04 | 北京无线电计量测试研究所 | A kind of measurement mechanism of frequency stability of superconduction frequency stabilization oscillator |
| CN103575982A (en) * | 2013-10-28 | 2014-02-12 | 中国科学院国家授时中心 | Method for real-time analysis of frequency stability |
| CN103575982B (en) * | 2013-10-28 | 2016-01-20 | 中国科学院国家授时中心 | A kind of real-time frequency Analysis on Stability method |
| CN104122440A (en) * | 2014-07-24 | 2014-10-29 | 中国电子科技集团公司第二十九研究所 | Method for sensing crystal oscillator frequency shift |
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| CN108132382A (en) * | 2017-12-20 | 2018-06-08 | 江汉大学 | A kind of system for measurement frequency stability |
| CN108226633A (en) * | 2018-01-02 | 2018-06-29 | 京东方科技集团股份有限公司 | Frequency detecting method and frequency detecting device |
| CN108710026A (en) * | 2018-06-14 | 2018-10-26 | 东南大学 | Frequency stability measurement method based on high-precision phase frequency analysis and system |
| CN108710026B (en) * | 2018-06-14 | 2020-05-05 | 东南大学 | Frequency stability measuring method and system based on high-precision phase frequency analysis |
| CN110007149A (en) * | 2019-03-28 | 2019-07-12 | 河北远东通信系统工程有限公司 | A kind of linear ratio phase method of digitlization phase shift auxiliary |
| CN110007150A (en) * | 2019-03-28 | 2019-07-12 | 河北远东通信系统工程有限公司 | A kind of linear ratio phase method of Direct Digital Phase Processing |
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