CN106291102B - A kind of Frequency Standard Comparison device and method - Google Patents
A kind of Frequency Standard Comparison device and method Download PDFInfo
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- CN106291102B CN106291102B CN201610648402.1A CN201610648402A CN106291102B CN 106291102 B CN106291102 B CN 106291102B CN 201610648402 A CN201610648402 A CN 201610648402A CN 106291102 B CN106291102 B CN 106291102B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
- G01R23/10—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into a train of pulses, which are then counted, i.e. converting the signal into a square wave
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
- G01R23/12—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into phase shift
Abstract
The invention proposes a kind of Frequency Standard Comparison device and method based on FPGA, for solving in existing Frequency Standard Comparison device and method, there are the technical problems that the response time is long, precision and resolution ratio are low, Frequency Standard Comparison device, including frequency synthesis module, signal conditioning module, Phase coincidence detection module, phase coincidence point demarcating module and frequency marking computing module；Comparing method for frequency standard implementation steps are as follows: obtain mediated signal, and agency signal, reference signal and measured signal carry out signal condition respectively, obtain corresponding square-wave signal；Intermediary's square-wave signal is subjected to Phase coincidence detection with reference square-wave signal and tested square-wave signal respectively, and will test result and be converted to time interval counter value, while being demarcated to testing result is carried out；Count value and calibration result input frequency marking computing module are calculated, obtain Frequency Standard Comparison as a result, response strong real-time of the invention, precision and high resolution, can be used for atomic frequency standard accuracy and stable measurement.
Description
Technical field
The invention belongs to time and frequency measurement fields, are related to a kind of Frequency Standard Comparison device and method, can be used for atomic frequency standard
Frequency accuracy and stable measurement.
Background technique
Frequency Standard Comparison technology is related to aerospace, navigator fix, defence clcctronic technology, Communication Engineering, electronic instrument, day
The field of numerous chronometer times and frequency observation and control technology such as text and metering, and the comparison technology between frequency standard is to guarantee this
The basic technology of a little high and new technology development.With the development of atomic frequency standard and reaching its maturity for production technology, the frequency of atomic frequency standard
Rate accuracy and stability steadily improve, and manufacturing cost constantly reduces, and the application range of atomic frequency standard also expands rapidly.In order to
Enough effects that is more preferable, broadly playing these frequency markings, it is also more next to high-precision, the demand of high-resolution Frequency Standard Comparison technology
It is more urgent.
Traditional comparing method for frequency standard is mainly include the following types: phase Comparison Method, oscilloscope method, frequency difference multiplication method, difference frequency
Periodic method and time difference method etc., wherein frequency difference multiplication method, difference frequency periodic method, time difference method and phase Comparison Method can obtain higher ratio
To resolution ratio and comparison accuracy.Although the comparison resolution ratio of phase Comparison Method is higher, the response time compared is too long, and
There are apparent blind area and inelastic regions, are suitable only for the measurement of long-term objective；Structure is complicated for the realization of frequency difference multiplication method,
And a large amount of frequency multipliers, frequency mixer and frequency-selecting route are used, the source of additional noise is also more, so cost is high and comparison divides
The raising limited potential of resolution；Difference frequency periodic method will also use low-frequency mixer and low-pass filter etc., can introduce additional noise,
The raising for comparing resolution ratio is all limited to the noise of frequency mixer；The realization structure of time difference method is also more complicated, has equally used more
A frequency mixer, low-pass filter and zero-crossing detector, so the raising for comparing resolution ratio is also very limited.
Traditional comparing method for frequency standard is there is the problems such as resolution ratio is low and the comparison response time is longer is compared, in numerous sections
It under the unremitting effort of skilled worker author, has developed that some comparison resolution ratio are higher, compares response time shorter Frequency Standard Comparison side
Method.Current widely used method is double mixing time difference methods.Traditional double mixing time difference methods, firstly, utilizing frequency synthesis
Device generates intermediary's frequency signal；Secondly, intermediary's frequency signal to be sent to reference signal and measured signal to two double flat weighing apparatuses respectively
The input terminal of frequency mixer, and two-way difference frequency signal is obtained by carrying out low-pass filtering to output signal；Next, to two difference frequencies
Signal carries out zero passage detection respectively, and will test result respectively as the commencing signal and end signal for counting gate, generates meter
Number gate；Then, it is being counted in gate time using time-interval counter, reference signal is counted, count results are obtained；Most
Eventually, it is calculated using count results, obtains Frequency Standard Comparison result.The Frequency Standard Comparison obtained with this method is as a result, its resolution ratio
Depending on the frequency of difference frequency signal and the ratio of reference signal frequency, since the frequency of difference frequency signal is far smaller than reference frequency,
Therefore the Frequency Standard Comparison result comparison resolution ratio with higher obtained using this method, and since this method is using double mixing
Mode carries out frequency difference acquisition, therefore the comparison response time of this method is also shorter.But this method has apparent defect, that is, adopts
With analog devices such as frequency mixer, filter circuit and zero-crossing detectors, a large amount of additional noise is introduced, causes to compare resolution ratio
Restriction of the raising by device precision with comparison accuracy.
In recent years, many researchers make improvements on the basis of traditional double mixing time difference methods, propose
Some new Frequency Standard Comparison device and methods.For example, king sea 2007 in entitled " accurate time and frequency measurement and control technology research "
Doctoral thesis in a high resolution frequency standard comparison device based on equivalent phase demodulation frequency proposing, in the Frequency Standard Comparison device
Including for generating the common frequency source of intermediary's frequency signal；FPGA, including two Phase coincidence detection modules, a counting
Gate generation module, a delay control module and a time interval counter module, for indirectly to measured signal and ginseng
It examines signal and carries out Phase coincidence detection, and will test result and be converted to time interval counter value；Microprocessor, for calculating frequency marking
The result of comparison；LCD, for showing the result of Frequency Standard Comparison.The high resolution frequency standard ratio based on equivalent phase demodulation frequency
The phase coincidence point cluster between reference signal and measured signal is obtained using FPGA to device, improve frequency compare resolution ratio and
While comparison accuracy, it is effectively shortened the response time of Frequency Standard Comparison.But since the Frequency Standard Comparison device directly utilizes
The phase coincidence point cluster arrived can bring counting error, to give frequency marking ratio as the commencing signal and end signal that count gate
Error is brought to result；The comparison accuracy and comparison resolution ratio of the Frequency Standard Comparison device depend on the essence of Phase coincidence detection too much
Degree, and Phase coincidence detection detects the restriction of route or device fulfillment capability due to it, it is difficult to reach very high detection accuracy, and
And cause the precision and resolution ratio that are difficult to further improve Frequency Standard Comparison.And delays time to control is used in the Frequency Standard Comparison device
Module causes the real-time compared to need further to improve.
Summary of the invention
It is an object of the invention to overcome the problems of the above-mentioned prior art, a kind of frequency marking ratio based on FPGA is proposed
It is not high and compare for solving comparison accuracy existing for the existing Frequency Standard Comparison device and method based on FPGA to device and method
The not high technical problem of resolution ratio.
To achieve the goals above, the technical scheme adopted by the invention is as follows:
A kind of Frequency Standard Comparison device, including frequency synthesis module, signal conditioning module, Phase coincidence detection module, counting
Gate generation module, time interval counter module and frequency marking computing module, in which:
Frequency synthesis module, for generating mediated signal；
Signal conditioning module, including reference signal conditioning module, measured signal conditioning module and mediated signal conditioning module,
For being filtered shaping to reference signal, measured signal and mediated signal respectively；
Phase coincidence detection module, including first phase coincidence detection module and second phase coincidence detection module, first
Phase coincidence detection module, for carrying out Phase coincidence detection to the reference signal and mediated signal of passing through filter shape, and it is defeated
Testing result out；Second phase is overlapped detection module, for the mediated signal and measured signal progress phase Jing Guo filter shape
Position is overlapped detection, and output test result；
Gate generation module is counted, is generated using obtained Phase coincidence detection result and counts gate；
Time interval counter module, for being greatest common factor (G.C.F.) frequency integral multiple to frequency in counting in gate for output
Square-wave signal is counted, and exports count value；
Frequency marking computing module, for calculating Frequency Standard Comparison result；
It is characterized by: the first phase is overlapped detection module, including first phase coincidence point cluster generation module and the
One phase coincidence point detection module, the output end of the first phase coincidence point detection module are connected with first phase coincidence point mark
Cover half block；The second phase is overlapped detection module, including second phase coincidence point cluster generation module and second phase coincidence point
Detection module, the output end of the second phase coincidence point detection module are connected with second phase coincidence point demarcating module；It is described
Counting gate generation module includes that the first counting gate generation module and second count gate generation module；The time interval meter
Digital-to-analogue block includes first time interval counting module and the second time interval counter module.
Above-mentioned first phase coincidence point cluster generation module, second phase coincidence point cluster generation module, first phase coincidence point
Detection module, second phase coincidence point detection module, first count gate generation module, second count gate generation module, the
One time interval counter module, the second time interval counter module and frequency marking computing module are built inside FPGA.
Above-mentioned first phase coincidence point demarcating module and second phase coincidence point demarcating module include one and are sequentially connected
Frequency departure device and ADC chip；Frequency departure device, for generating the sinusoidal letter that frequency is greatest common factor (G.C.F.) frequency integral multiple
Number；ADC chip, for being demarcated to effective phase coincidence point.
Above-mentioned ADC chip, the effective phase coincidence point control exported respectively by the first and second phase coincidence point detection modules
System samples the sinusoidal signal that frequency is greatest common factor (G.C.F.) frequency integral multiple, to complete to effective phase coincidence point
Calibration.
A kind of comparing method for frequency standard comprising the steps of:
Step 1, using reference signal, frequency synthesis is carried out, mediated signal is obtained；
Step 2, signal condition is carried out to reference signal, measured signal and mediated signal respectively, is obtained with reference to square-wave signal
fR, tested square-wave signal fxWith intermediary square-wave signal f0；
Step 3, quantization phase shift principle, agency square-wave signal f are utilized0Respectively with reference square-wave signal fRWith tested square wave
Signal fxPhase coincidence detection is carried out, first via phase coincidence point cluster A and the second road phase coincidence point cluster B are obtained；
Step 4, using detection trigger circuit, to the effective of each phase coincidence point in first via phase coincidence point cluster A
Property detected, judge whether these phase coincidence points are effectively, if so, export effective phase coincidence point C, if it is not, abandoning
These phase coincidence points；Meanwhile the validity of each phase coincidence point in the second road phase coincidence point cluster B is detected,
Judge whether these phase coincidence points are effectively, if so, effective phase coincidence point D is exported, if it is not, abandoning these phase coincidences
Point；
Step 5, using pulse-generating circuit, by effective phase coincidence points two adjacent in effective phase coincidence point C point
Not as the commencing signal and end signal for counting gate, generates and count gate Δ tC；Meanwhile it will be in effective phase coincidence point D
Two adjacent effective phase coincidence points generate respectively as the commencing signal and end signal for counting gate and count gate Δ
tD；
Step 6, in the counting gate Δ t of outputCIt is interior, it is with reference to square-wave signal f to frequencyRWith intermediary square-wave signal f0's
Greatest common factor (G.C.F.) frequency fmaxc1NCSquare-wave signal again is counted, and count value m is obtainedC；Meanwhile in the counting gate of output
ΔtDIt is interior, it is tested square-wave signal f to frequencyxWith intermediary square-wave signal f0Greatest common factor (G.C.F.) frequency fmaxc2NDSquare wave again
Signal is counted, and count value m is obtainedD, wherein nCAnd nDIt is positive integer；
Step 7, while carrying out step 6, gate Δ t is counted to being used as in step 5CCommencing signal and end signal
Effective phase coincidence point demarcated, obtain count gate Δ tCStart time corresponding sinusoidal signal range value VC_sta, and
Its finish time corresponding sinusoidal signal range value VC_end；Meanwhile gate Δ t is counted to being used as in step 5DCommencing signal and
Effective phase coincidence point of end signal is demarcated, and obtains counting gate Δ tDStart time corresponding sinusoidal signal range value
VD_staSinusoidal signal range value V corresponding with its finish timeD_end；
Step 8, according to calibration result VC_staAnd VC_end, utilize arcsine formula count value mCOffset Δ mC；
According to calibration result VD_staAnd VD_end, utilize arcsine formula count value mDOffset Δ mD；
Step 9, measured signal f is calculatedxWith reference signal fRBetween relative frequency differenceFrequency Standard Comparison is obtained as a result, calculating
Formula are as follows:
Compared with prior art, the present invention having the advantage that
1. the count value of the invention due to being obtained using time-interval counter during Frequency Standard Comparison result calculates
Calibration result with being obtained using phase coincidence point demarcating module, simultaneously participates in calculating, realizes the compensation to count value and school
The precision and resolution ratio of Frequency Standard Comparison has been significantly increased compared with prior art in standard.
2. the present invention due to generate count gate during, using phase coincidence point detection module to obtained phase
Phase coincidence point in coincidence point cluster has carried out validation checking, and will test result and generate as commencing signal and end signal
The higher counting gate of precision, the direct method phase that counting gate is generated using phase coincidence point cluster used with the prior art
Than effectively improving the precision of Frequency Standard Comparison.
3. the present invention is due to passing through two meters using two-way Phase coincidence detection result during generating counting gate
Number gate generation module generates the independent counting gate of two-way respectively, controls one with delay control module is used in the prior art
Gate generation module is counted, counting gate all the way is generated according to two-way Phase coincidence detection result and is compared, Frequency Standard Comparison is being improved
Precision while, be effectively shortened the response time of comparison, improve compare response real-time.
Detailed description of the invention
Fig. 1 is the overall structure diagram of Frequency Standard Comparison device of the present invention；
Fig. 2 is the implementation process block diagram of comparing method for frequency standard of the present invention；
Fig. 3 is the schematic diagram that the present invention carries out effective phase coincidence point calibration.
Specific embodiment
Below in conjunction with drawings and examples, invention is further described in detail:
Referring to Fig.1, mark comparison device of the invention, including frequency synthesis module, signal conditioning module, Phase coincidence detection
Module counts gate generation module, time interval counter module and frequency marking computing module.
Frequency synthesis module, for obtaining mediated signal.To simplify apparatus structure, reduces cost, in the present embodiment, use
In high precision, the common frequency source of high stability replaces frequency synthesizer, carries out the generation and acquisition of mediated signal.Utilize high stable
The reference signal of degree locks selected common frequency source, to obtain intermediary's frequency signal.To make acquired intermediary
Frequency signal and reference signal frequency stability having the same, but its frequency and reference signal frequency and measured signal frequency are equal
With certain difference.
Signal conditioning module, including reference signal conditioning module, measured signal conditioning module and the conditioning of intermediary's frequency signal
Module, for being filtered shaping to reference signal, measured signal and intermediary's frequency signal respectively.In order to easily carry out phase
Be overlapped detection, first with the signal conditioning module comprising plastic filter circuit in the present embodiment, to reference signal, measured signal and
Intermediary's frequency signal is filtered shaping respectively, obtains regular square-wave signal.
Phase coincidence detection module, including first phase is overlapped detection module and second phase is overlapped detection module, is used for
Phase coincidence detection, and output test result are carried out to two signals by filter shape.Wherein, first phase is overlapped detection
Module, including first phase coincidence point cluster generation module and first phase coincidence point detection module；First phase coincidence point fasciation
First via phase weight is obtained for intermediary's square-wave signal to be carried out Phase coincidence detection with reference square-wave signal respectively at module
Chalaza cluster A；First phase coincidence point detection module, for each of obtained first via phase coincidence point cluster A phase
Coincidence point carries out validation checking respectively, and exports effective phase coincidence point C that detection obtains.Wherein, second phase is overlapped inspection
Survey module, including second phase coincidence point cluster generation module and second phase coincidence point detection module；Second phase coincidence point cluster
Generation module obtains the second tunnel phase for intermediary's square-wave signal to be carried out Phase coincidence detection with tested square-wave signal respectively
Coincidence point cluster B；Second phase coincidence point detection module, for each of the second obtained road phase coincidence point cluster B phase
Position coincidence point carries out validation checking respectively, and exports effective phase coincidence point D that detection obtains.In phase weight in the present embodiment
After chalaza cluster generation module, phase coincidence point detection module is increased, for obtaining each of phase coincidence point cluster
Phase coincidence point carries out validation checking, to further improve the accuracy of Phase coincidence detection result.
Counting gate generation module, including the first counting gate generation module and the second counting gate generation module, first
Gate generation module is counted to be used for using two adjacent effective phase coincidence points in effective phase coincidence point C as counting
The commencing signal and end signal of gate generate and count gate Δ tC, meanwhile, the second counting gate generation module is used for will be effective
Two adjacent effective phase coincidence points in phase coincidence point D respectively as the commencing signal and end signal for counting gate,
It generates and counts gate Δ tD.Two-way Phase coincidence detection is utilized in the present embodiment as a result, generating two mutual independent meters simultaneously
Number gate, avoids interfering with each other between two-way Phase coincidence detection result, improves the precision for counting gate.Generating meter
During number gate, does not use delay control module to intervene it in the present embodiment, significantly shorten the sound of comparison
Between seasonable, the real-time of comparison is improved.
Time interval counter module, including first time interval counting module and the second time interval counter module, first
Time interval counter module is used to count gate Δ tCInterior, agency square-wave signal is counted, and obtains count value mC, meanwhile,
Second time interval counter module is used to count gate Δ tDInterior, agency square-wave signal is counted, and obtains count value mD。
Phase coincidence point demarcating module, including first phase coincidence point demarcating module and second phase coincidence point calibration mold
Block.Wherein, first phase coincidence point demarcating module includes first frequency deviation generator and the first ADC chip；First frequency is inclined
Poor generator, for generating the greatest common factor (G.C.F.) frequency f that frequency is mediated signal and reference signalmaxc1The sinusoidal letter of integral multiple
Number；First ADC chip, for as counting gate Δ tCCommencing signal and end signal effective phase coincidence point carry out
Calibration, obtains calibration result VC_endAnd VC_end, calibration result is then sent into frequency marking computing module；Second phase coincidence point mark
Cover half block includes second frequency deviation generator and the 2nd ADC chip；Second frequency deviation generator, for generating during frequency is
The greatest common factor (G.C.F.) frequency f of Jie's signal and measured signalmaxc2The sinusoidal signal of integral multiple；2nd ADC chip, by as based on
Number gate Δ tDCommencing signal and effective phase coincidence point of end signal demarcated, obtain calibration result VD_staWith
VD_end, calibration result is then sent into frequency marking computing module.In the present embodiment, frequency is the maximum of mediated signal and reference signal
Common factor frequency fmaxc1The sinusoidal signal and frequency of integral multiple are the greatest common factor (G.C.F.) frequency f of mediated signal and measured signalmaxc2
The sinusoidal signal of integral multiple is the sinusoidal signal that frequency is mediated signal frequency.The meter that calibration result is carried out in the present embodiment
Calculating is mainly that arcsine calculates, and obtains the detection moment of effective phase coincidence point, so that time interval counter module is obtained
Count value is compensated and is calibrated, and can greatly improve the resolution ratio and accuracy of Frequency Standard Comparison.
Frequency marking computing module carries out the calculating of Frequency Standard Comparison result using count value and the obtained calibration result of output.
In the present embodiment, above-mentioned Phase coincidence detection module, count gate generation module, time interval counter module and
Frequency marking computing module, builds inside FPGA.FPGA selects Xilinx Virtex-6 series 240T chip in the present embodiment,
Its price is relatively cheap, and logical resource is entirely capable of meeting the requirements.
Referring to Fig. 2, comparing method for frequency standard of the invention is achieved by the steps of:
Step 1. obtains mediated signal；
Using the reference signal locking frequency synthesizer of high stability, generates and obtain mediated signal.Using this side
Formula, the mediated signal got and reference signal frequency stability having the same, and require the mediated signal got with
There is certain frequency difference between reference signal and measured signal.
Step 2. carries out signal condition to reference signal, measured signal and obtained mediated signal respectively, obtains corresponding
Square-wave signal；
Shaping is filtered to reference signal, measured signal and obtained mediated signal respectively, obtains regular reference side
Wave signal fR, tested square-wave signal fxWith intermediary square-wave signal f0。
Step 3. is to obtained intermediary square-wave signal f0Respectively with obtained reference square-wave signal fRWith obtained tested square wave
Signal fxPhase coincidence detection is carried out, Phase coincidence detection result is obtained；
Using quantization phase shift principle, to obtained intermediary square-wave signal f0Respectively with obtained reference square-wave signal fRWith
The tested square-wave signal f arrivedxPhase coincidence detection is carried out, first via phase coincidence point cluster A and the second road phase coincidence point are obtained
Cluster B.According to quantitative phase principle, within a least common multiple one number time, answer between two signals of Phase coincidence detection
When only one phase coincidence point, still, in implementation process, due to the limit by Phase coincidence detection circuit fulfillment capability
System, obtained phase coincidence point is cluster cluster.Using detection trigger circuit, to obtained first via phase coincidence point cluster A
In the validity of each phase coincidence point detected, judge whether these phase coincidence points are effectively, if so, output is effective
Phase coincidence point C, if it is not, abandoning these phase coincidence points；Meanwhile to every in the second obtained road phase coincidence point cluster B
The validity of a phase coincidence point is detected, and judges whether these phase coincidence points are effectively, if so, exporting effective phase
Coincidence point D, if it is not, abandoning these phase coincidence points.
Phase coincidence detection result is converted to count value by step 4., obtains count value；
Using pulse-generating circuit, using effective phase coincidence points two adjacent in effective phase coincidence point C as
The commencing signal and end signal of gate are counted, generates and counts gate Δ tC；Meanwhile by two phases in effective phase coincidence point D
Adjacent effective phase coincidence point generates respectively as the commencing signal and end signal for counting gate and counts gate Δ tD.Defeated
Counting gate Δ t outCIt is interior, it is with reference to square-wave signal f to frequencyRWith intermediary square-wave signal f0Greatest common factor (G.C.F.) frequency fmaxc1
NCSquare-wave signal again is counted, and count value m is obtainedC；Meanwhile in the counting gate Δ t of outputDIt is interior, it is tested to frequency
Square-wave signal fxWith intermediary square-wave signal f0Greatest common factor (G.C.F.) frequency fmaxc2NDSquare-wave signal again is counted, and is counted
Numerical value mD, wherein nCAnd nDIt is positive integer.
In the present embodiment, in order to be overlapped the rising edge of count target with the rising edge for counting gate, time interval is improved
The accuracy of counting module count value, makes nCValue be f0/fmaxc1,nDValue be f0/fmaxc2, i.e., frequency be most grand duke because
Sub- frequency fmaxc1NCSquare-wave signal again and frequency are greatest common factor (G.C.F.) frequency fmaxc2NDSquare-wave signal again is intermediary
Square-wave signal.
Step 5. demarcates Phase coincidence detection result, obtains calibration result；
While carrying out step 4, obtained first via Phase coincidence detection result is demarcated, obtains counting gate
ΔtCStart time corresponding sinusoidal signal range value VC_staSinusoidal signal range value V corresponding with its finish timeC_end；Together
When, the second obtained road Phase coincidence detection result is demarcated, obtains counting gate Δ tDStart time corresponding sine
Signal amplitude value VD_staSinusoidal signal range value V corresponding with its finish timeD_end.The calibration principle of the present embodiment such as Fig. 3
It is shown.
Step 6. calculates Frequency Standard Comparison result；
Using obtained count value and calibration result, measured signal f is calculatedxWith reference signal fRBetween relative frequency difference
Frequency Standard Comparison is obtained as a result, calculation formula are as follows:
Wherein, Δ mCWith Δ mDRespectively count value mCWith count value mDOffset, calculation formula is respectively as follows:
ΔmC=Δ kC·ΔT ②
ΔmD=Δ kD·ΔT ③
Wherein, Δ kCFor as counting gate Δ tCWhen the detection of effective phase coincidence point of commencing signal and end signal
The inconsistent amount being engraved in phase coincidence point cluster, Δ kDFor as counting gate Δ tDEffective phase of commencing signal and end signal
Inconsistent amount of the detection moment of position coincidence point in phase coincidence point cluster.
Referring to Fig. 3, the comparison accuracy in the present embodiment depends on the detection moment of the effective phase coincidence point of two-way in two-way
The inconsistent degree of position in phase coincidence point cluster.In order to obtain this inconsistent amount, the present embodiment utilizes effective phase
Coincidence point detection moment is greatest common factor (G.C.F.) frequency f in frequencymaxN times of sinusoidal signal on calibration indicate to have accordingly
Position of the phase coincidence point in its cluster is imitated, to obtain this inconsistent amount.Above-mentioned calibration is by being most grand duke to frequency
N times of sinusoidal signal of factor frequency is sampled, and the corresponding sinusoidal signal amplitude of effective phase coincidence point detection moment is obtained
It is worth and realizes.Then, it is calculated by necessity based on arcsine formula, available effective phase coincidence point detection moment
Inconsistent amount Δ k in cluster.
Above description is only example of the present invention, it is clear that for those skilled in the art, is being understood
After the contents of the present invention and principle, all form and details may be carried out without departing substantially from the principle of the present invention, structure
On various modifications and variations, but these modifications and variations based on inventive concept are still protected in claim of the invention
Within the scope of.
Claims (7)
1. a kind of Frequency Standard Comparison device, including frequency synthesis module, signal conditioning module, Phase coincidence detection module, counting lock
Door generation module, time interval counter module and frequency marking computing module, in which:
Frequency synthesis module, for generating mediated signal；
Signal conditioning module, including reference signal conditioning module, measured signal conditioning module and mediated signal conditioning module, are used for
Shaping is filtered to reference signal, measured signal and mediated signal respectively；
Phase coincidence detection module, including first phase is overlapped detection module and second phase is overlapped detection module, first phase
It is overlapped detection module, for carrying out Phase coincidence detection to the reference signal and mediated signal of passing through filter shape, and exports inspection
Survey result；Second phase is overlapped detection module, for the mediated signal and measured signal progress phase weight Jing Guo filter shape
Close detection, and output test result；
Gate generation module is counted, is generated using obtained Phase coincidence detection result and counts gate；
Time interval counter module, for the square wave counted in gate to frequency for greatest common factor (G.C.F.) frequency integral multiple in output
Signal is counted, and exports count value；
Frequency marking computing module, for calculating Frequency Standard Comparison result；
It is characterized by: the first phase is overlapped detection module, including first phase coincidence point cluster generation module and the first phase
Position coincidence point detection module, the output end of the first phase coincidence point detection module are connected with first phase coincidence point calibration mold
Block；The second phase is overlapped detection module, including second phase coincidence point cluster generation module and the detection of second phase coincidence point
Module, the output end of the second phase coincidence point detection module are connected with second phase coincidence point demarcating module；The counting
Gate generation module includes that the first counting gate generation module and second count gate generation module；The time interval counter mould
Block includes first time interval counting module and the second time interval counter module.
2. Frequency Standard Comparison device according to claim 1, it is characterised in that: the first phase coincidence point fasciation Cheng Mo
Block, second phase coincidence point cluster generation module, first phase coincidence point detection module, second phase coincidence point detection module,
One counts gate generation module, the second counting gate generation module, first time interval counting module, the second time interval counter
Module and frequency marking computing module are built inside FPGA.
3. Frequency Standard Comparison device according to claim 1, it is characterised in that: the first phase coincidence point demarcating module and
Second phase coincidence point demarcating module includes a frequency departure device and ADC chip being sequentially connected；Frequency departure device is used
In the sinusoidal signal that generation frequency is greatest common factor (G.C.F.) frequency integral multiple；ADC chip, for being marked to effective phase coincidence point
It is fixed.
4. Frequency Standard Comparison device according to claim 3, it is characterised in that: the ADC chip, respectively by first and second
Effective phase coincidence point control of phase coincidence point detection module output is the sine of greatest common factor (G.C.F.) frequency integral multiple to frequency
Signal is sampled, to complete the calibration to effective phase coincidence point.
5. a kind of comparing method for frequency standard comprising the steps of:
(1) reference signal is utilized, frequency synthesis is carried out, obtains mediated signal；
(2) signal condition is carried out to reference signal, measured signal and mediated signal respectively, is obtained with reference to square-wave signal fR, tested side
Wave signal fxWith intermediary square-wave signal f0；
(3) quantization phase shift principle, agency square-wave signal f are utilized0Respectively with reference square-wave signal fRWith tested square-wave signal fxInto
Row Phase coincidence detection obtains first via phase coincidence point cluster A and the second road phase coincidence point cluster B；
(4) using detection trigger circuit, the validity of each phase coincidence point in first via phase coincidence point cluster A is examined
It surveys, judges whether these phase coincidence points are effectively, if so, effective phase coincidence point C is exported, if it is not, abandoning these phases
Coincidence point；Meanwhile the validity of each phase coincidence point in the second road phase coincidence point cluster B is detected, judge these
Whether phase coincidence point is effectively, if so, effective phase coincidence point D is exported, if it is not, abandoning these phase coincidence points；
(5) pulse-generating circuit is utilized, using effective phase coincidence points two adjacent in effective phase coincidence point C as meter
The commencing signal and end signal of number gate, generate and count gate Δ tC；Meanwhile it is adjacent by two in effective phase coincidence point D
Effective phase coincidence point respectively as count gate commencing signal and end signal, generate count gate Δ tD；
(6) in the counting gate Δ t of outputCIt is interior, it is with reference to square-wave signal f to frequencyRWith intermediary square-wave signal f0Most grand duke because
Sub- frequency fmaxc1NCSquare-wave signal again is counted, and count value m is obtainedC；Meanwhile in the counting gate Δ t of outputDIt is interior, it is right
Frequency is tested square-wave signal fxWith intermediary square-wave signal f0Greatest common factor (G.C.F.) frequency fmaxc2NDSquare-wave signal again is counted
Number, obtains count value mD, wherein nCAnd nDIt is positive integer；
(7) while carrying out step (6), gate Δ t is counted to being used as in step (5)CCommencing signal and end signal have
Effect phase coincidence point is demarcated, and obtains counting gate Δ tCStart time corresponding sinusoidal signal range value VC_sta, He Qijie
Beam moment corresponding sinusoidal signal range value VC_end；Meanwhile gate Δ t is counted to being used as in step (5)DCommencing signal and knot
Effective phase coincidence point of beam signal is demarcated, and obtains counting gate Δ tDStart time corresponding sinusoidal signal range value
VD_staSinusoidal signal range value V corresponding with its finish timeD_end；
(8) according to calibration result VC_staAnd VC_end, utilize arcsine formula count value mCOffset Δ mC；According to calibration
As a result VD_staAnd VD_end, utilize arcsine formula count value mDOffset Δ mD；
(9) measured signal f is calculatedxWith reference signal fRBetween relative frequency differenceFrequency Standard Comparison is obtained as a result, calculation formula are as follows:
6. comparing method for frequency standard according to claim 5, it is characterised in that: the sinusoidal signal, it can will all the way
All effective phase coincidence points in phase coincidence point cluster are placed in the phase range of 0~π/4 of a cycle.
7. comparing method for frequency standard according to claim 5, it is characterised in that: offset Δ m described in step (8)CWith
ΔmD, calculation formula is respectively as follows:
ΔmC=Δ kC·ΔT
ΔmD=Δ kD·ΔT
Wherein, Δ kCFor as counting gate Δ tCThe detection moment of effective phase coincidence point of commencing signal and end signal exists
Inconsistent amount in phase coincidence point cluster, Δ kDFor as counting gate Δ tDEffective phase weight of commencing signal and end signal
Inconsistent amount of the detection moment of chalaza in phase coincidence point cluster.
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