CN104090160A - High-precision frequency measuring device - Google Patents
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- CN104090160A CN104090160A CN201410242813.1A CN201410242813A CN104090160A CN 104090160 A CN104090160 A CN 104090160A CN 201410242813 A CN201410242813 A CN 201410242813A CN 104090160 A CN104090160 A CN 104090160A
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Abstract
The invention provides a high-precision frequency measuring device in order to implement frequency measurement more stably. The high-precision frequency measuring device comprises a cesium clock standard frequency generator, a first shaping circuit, a second shaping circuit, a frequency multiplier circuit, a phase-controlled follower circuit, a high-frequency reference frequency generator, a gate signal generator, a first digital frequency multiplier, a second digital frequency multiplier, a first DDS, a second DDS, a third DDS and an MCU. The scheme of the invention can effectively improve the stability of frequency signals and reduce the link of analog frequency measurement.
Description
Technical field
The invention belongs to Electric Measurement Technology field, be specifically related to a kind of High Precision Frequency device.
Background technology
Along with scientific and technical develop rapidly, frequency meter has become indispensable instrument in scientific research, experiment, teaching as a kind of survey instrument.Commercially available digital frequency meter is all to be assembled by special frequency measurement chip, and its precision is high, function is strong, but expensive and complicated operation.
Method for frequency measurement has a lot, and the accuracy of frequency measurement depends primarily on measured frequency range and the feature of measurand.The precision of measuring not only depends on the precision of the frequency source using as standard, also depends on measuring equipment used and measuring method.At present conventional frequency measurement method has: direct frequency measurement method, multi-period Synchronous Measuring Frequency Method, analog interpolation, time m-amplitude transformation approach and vernier method etc.
At present, frequency measurement method based on faciation position is the study hotspot of measuring method, it is to be based upon measured signal fx and frequency standard signal f0 to have certain relation be that frequency relation is fixed and exists on the basis of certain frequency difference, in this case, the Changing Pattern of phase place quantum has certain linear feature, uses the high resolving power of faciation position relational implementation frequency to measure.
The application for a patent for invention that the application number that applicant submits to State Intellectual Property Office is CN201110279368 proposes a kind of frequency and phase differential precision measurement method based on frequency and phase relation auxiliary process, the 10MHz frequency marking of caesium clock output is first passed through shaping circuit and adjustable pulse-generating circuit production burst signal, again by the automatic frequency synthesis f0 of DDS, the value of f0 depends on the fx through single-chip microcomputer bigness scale, make the integral multiple in group's cycle of fx and f0 equal to measure the time value of gate, and the value of the faciation position quantum of fx and f0 equals the resolution of faciation position coincidence detection circuit, then by f0, fx sends into alien frequencies phase coincidence testing circuit and produces actual measurement gate, control counter work, MCU calculates the value of fx according to count results, finally by LCD, show output.
Yet such scheme has been used a plurality of counters and two gates, and has utilized multi-period Synchronous Measuring Frequency Method to measure, its measuring accuracy is subject to the restriction of counter and gate control accuracy.And, measuring the starting stage, due to reason generation vibration or the self-excitation of measured signal itself.
Summary of the invention
In order to overcome the deficiencies in the prior art, still guarantee high precision and the high stability effect of frequency measurement simultaneously, the present invention proposes a kind of High Precision Frequency device.
In order to achieve the above object, adopt following technical scheme: a kind of High Precision Frequency device, comprise caesium clock standard frequency generator, the first shaping circuit, the second shaping circuit, frequency multiplier circuit, phased follow circuit, high frequency standard frequency generator, signal strobe generator, the first digital frequency mltiplier, the second digital frequency mltiplier, the one DDS, the 2nd DDS, the 3rd DDS and MCU, wherein, the standard frequency that described caesium clock standard frequency generator produces is input to the first shaping circuit, the output terminal of the first shaping circuit is connected respectively to frequency multiplier circuit and phased follow circuit, the output terminal of frequency multiplier circuit connects respectively the input end of high frequency standard frequency generator and the input end of the first digital frequency mltiplier, by measured frequency end, through the output of the second shaping circuit and the output of phased follow circuit, be input to the first digital frequency mltiplier, the output terminal of the first digital frequency mltiplier connects signal strobe generator, the output terminal of signal strobe generator with by the output port of measured frequency end, be jointly connected to the input end of a DDS, by measured frequency end, through the second shaping circuit, be connected to an input end and the phased follow circuit of the second digital frequency mltiplier, two other input end of the second digital frequency mltiplier connects respectively the output terminal of a DDS and the output terminal of high frequency standard frequency generator, the second digital frequency mltiplier has two output terminals, one of them connects the input end of the 2nd DDS, another connects the input end of the 3rd DDS, the output terminal of the output terminal of the 2nd DDS and the 3rd DDS connects MCU, MCU output is by the measurement result of measured frequency.
Further, described the first shaping circuit and the second shaping circuit comprise respectively amplifier and wave filter.
Further, described the second shaping circuit also comprises digitizing shaping unit.
Further, described digitizing shaping unit is iir filter.
Further, described frequency multiplier circuit can also be the adjustable frequency dividing circuit of dutycycle.
Beneficial effect of the present invention is as follows:
(1) adopt a plurality of DDS to carry out frequency digitized processing, can improve the stability of frequency signal, reduced the measurement of analog frequency.
(2) adopt phased follower and digital frequency mltiplier jointly as the core of feedback element, can be to be produced digitized feedback by measured frequency.
(3) reduced gate circuit sum counter circuit, made frequency measurement more easily from the angle of numeric field, realize the measurement of high precision, high stability.
(4) to make measuring accuracy, measuring speed be controlled with adjustable in the use of frequency multiplier circuit or frequency dividing circuit, a plurality of digital frequency mltipliers, thereby can use in the situation that not needing full accuracy operation, device of the present invention is had and measure widely scene, applicability is strong.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the embodiment of the present invention.
Fig. 2 is the theory diagram of the phased follow circuit of the embodiment of the present invention.
Embodiment
Embodiment mono-
As shown in Figure 1, a kind of High Precision Frequency device, comprise caesium clock standard frequency generator, the first shaping circuit, the second shaping circuit, frequency multiplier circuit, phased follow circuit, high frequency standard frequency generator, signal strobe generator, the first digital frequency mltiplier, the second digital frequency mltiplier, the one DDS, the 2nd DDS, the 3rd DDS and MCU, wherein, the standard frequency that described caesium clock standard frequency generator produces is input to the first shaping circuit, the output terminal of the first shaping circuit is connected respectively to frequency multiplier circuit and phased follow circuit, the output terminal of described frequency multiplier circuit connects respectively the input end of high frequency standard frequency generator and the input end of the first digital frequency mltiplier, by measured frequency end, through the output of the second shaping circuit and the output of phased follow circuit, be imported into the first digital frequency mltiplier, the output terminal of the first digital frequency mltiplier connects signal strobe generator, the output terminal of signal strobe generator with by the output terminal of measured frequency end, be jointly connected to the input end of a DDS, by measured frequency end, through the second shaping circuit, be connected to an input end and the phased follow circuit of the second digital frequency mltiplier, two other input end of the second digital frequency mltiplier connects respectively the output terminal of a DDS and the output terminal of high frequency standard frequency generator, the second digital frequency mltiplier has two output terminals, one of them connects the input end of the 2nd DDS, another connects the input end of the 3rd DDS, the output terminal of the output terminal of the 2nd DDS and the 3rd DDS connects MCU, MCU output is by the measurement result of measured frequency.
Described the first shaping circuit comprises amplifier, and described the second shaping circuit comprises simulating signal wave filter and iir filter.This High Precision Frequency device has increased signal feedback part, and it comprises phased follow circuit, the first digital frequency mltiplier, signal strobe generator, a DDS and the second shaping circuit.
Principle of the present invention is as follows:
Caesium clock standard frequency generator produces the standard frequency f0 of 10MHz, the amplification of the amplitude obtaining after amplifier.Suppose that enlargement factor is A, the amplitude of the output frequency signal after amplifying is A|f0|, wherein | and f0| represents the amplitude of standard frequency f0.This amplitude is that the frequency signal of A|f0| is divided into two-way, one tunnel is input to phased follow circuit, another road becomes for example frequency signal of 20MHz through frequency multiplier circuit, and the frequency signal of this 20MHz is transferred to high frequency standard frequency generator and two unit of the first digital frequency mltiplier.
High frequency standard frequency generator produces the high frequency frequency of 1GHz, and this frequency generator adopts outside high-precision 20MHz frequency to carry out frequency calibration.This high frequency frequency can improve at the second digital frequency mltiplier and carry out the frequency accuracy of frequency while multiplying each other, and will illustrate in greater detail its precision principle below.
By measured frequency via being input in a DDS and the second shaping circuit by measured frequency end (be generally frequency probe).Thisly signal is divided into a road re-uses after signal shaping and mode that another road is just directly used without shaping, the composition that can retain to greatest extent measured signal, makes the second digital frequency mltiplier can obtain as much as possible abundanter frequency resource.
Wherein, through the tested frequency signal filtering of analog filter output the frequency of SHF band, ultralow frequency band equifrequency band.Through the filtered signal of analog filter, output to respectively phased follow circuit and the first digital frequency mltiplier.
This phased follow circuit is mainly the PLL phase-locked loop circuit consisting of CD4046 integrated phase lock, comprises the passive low ventilating filter LPF that phase detector PD, voltage controlled oscillator VCO and external R, C form, as shown in Figure 2.The basic functional principle of phase-locked loop circuit is by the phase differential between comparator input signal and voltage controlled oscillator output signal, regulates VCO output frequency to reach input, the synchronous object of output signal.
U0 is actual load voltage phase signal, and u0 produces time delay d1 through sampling shaping circuit, obtains square-wave signal u1.U1 adjusts time delay through RC and produces compensation of delay d2, obtains load voltage phase place square-wave signal u, and in conventional phase locked loops phase tracking circuit, u and u ' are same signal, as phase detector PD mono-tunnel input.
I0 is switching device switch change of current phase signal, and the switching device switching drive signal i1 that can be exported by VCO replaces, and d0 is switching device switch commutation time, namely the actual time delay difference between i1 and i0.I1 adjusts time delay through RC and produces compensation of delay d3, obtains switching device switch change of current current phase square-wave signal i, as another road input of phase detector PD.
Due to the phase-locked effect of PLL phase-locked loop circuit, make two square-wave signals of u (or u ') and i keep same-phase, phase differential is zero.D4 is the time interval between the zero crossing of u0 and the zero crossing of i0, i.e. phase differential between u0 and i0, obviously d4=(d3-d2)-d1-d0.
For people, be R1, the R2 adjusting, d2, d3 are changeless during power work, so the size of d4 is determined by d0 and d1.If d4=0, loaded work piece is at quasi-resonance state, and switching device can be realized under zero-current switching (ZCS) and minimum voltage open-minded; If d4 < 0, loaded work piece is perceptual state (zero crossing of i0 lags behind the zero crossing of u0), now flowing out phase switching device is hard shutoff, and because loop exists lead-in inductance, produces a peak voltage when switching device is turn-offed; If d4 > 0, loaded work piece is capacitive state (zero crossing of i0 is ahead of the zero crossing of u0), while now flowing into the conducting of phase switching device, voltage is higher, there is conducting dash current, after the diode change of current of simultaneously connecting with outflow phase switching device, can bear back-pressure, back-pressure is larger, and reverse recovery current is larger, and diode power consumption is also larger.
Meanwhile, by measured frequency, after iir filter, outputed to the first digital frequency mltiplier, multiply each other with the output of frequency multiplier circuit, produce the frequency signal through the standard signal calibration of caesium clock standard frequency generator output.So far, if the frequency signal to be measured being obtained by measured frequency end has certain fluctuation, or while just starting to measure, produce unstable situation, this unsettled frequency signal will be mixed by phased follow circuit and the first digital frequency mltiplier, and feed back to the input end of signal strobe generator, by the control of signal strobe, be input to a DDS and carry out digitizing, thereby improved the stability of frequency signal, eliminated as much as possible the interference of the situations such as self-excitation, vibration for frequency measurement.
Signal strobe generator adopts digitizing counter, multidigit scale-of-two output string linage-counter for example, and conventional have CD4024, CD4040 and a CD4060 etc., the binary counter that they are all comprised of toggle flip-flop, difference is its figure place.Radix two counter is mainly used in regularly at this.In the predetermined moment, export the DDS that outputs signal to of the first digital frequency mltiplier.
The one output signal of DDS and the signal of aforementioned 1GHz, and by measured frequency, be jointly imported into the second digital frequency mltiplier through the digitized of iir filter filtering.Due to the effect of this high-frequency signal of 1GHz, make in carrying out the process of multiplying, the low frequency of measured frequency signal and high frequency are all amplified as much as possible.The 2nd DDS and the 3rd DDS are respectively used to process low frequency signal and high-frequency signal, when signal outputs to the 2nd DDS and the 3rd DDS, by being divided into low frequency DDS and the applicable two parts of signals of high frequency DDS, while processing respectively, be conducive to improve the degree of accuracy of final measurement.
The output signal of the 2nd DDS and the 3rd DDS is all imported into two input pins of MCU, wherein for example adopts PIC16F690-I/S0 single-chip microcomputer as MCU.In processing procedure, the signal of two input pins is counted respectively, and be added after counting.The final result being added is measured frequency.
Table 1 signal frequency experiments of measuring result
| Measured signal fx | Record frequency values (Hz) | Second stability | 10 second stabilities |
| X72 rubidium clock 10MHz | 10000000.0001±1 | 7.2×10 -12 | 8.0×10 -13 |
| OSA 8607B 5MHz | 5000000.4731±1 | 6.7×10 -12 | 3.2×10 -12 |
| HP8662A 12.8MHz | 12800000.5379±1 | 6.3×10 -12 | 3.3×10 -12 |
| HP8662A 16.384MHz | 16384000.5584±1 | 6.6×10 -12 | 3.6×10 -12 |
| HP8662A 20971523Hz | 20971523.5796±1 | 6.2×10 -12 | 3.3×10 -12 |
Above-mentioned data show, no matter the relation of the system measured signal after improvement and frequency standard signal is simple or more complicated, Measurement sensibility degree all can reach 10
-12magnitude, Surveying Actual Precision can reach 10
-13/ s magnitude, has realized the equal precision measurement to optional frequency signal.
Embodiment bis-
A High Precision Frequency device, comprises caesium clock standard frequency generator, the first shaping circuit, the second shaping circuit, frequency dividing circuit, phased follow circuit, high frequency standard frequency generator, signal strobe generator, the first digital frequency mltiplier, the second digital frequency mltiplier, a DDS, the 2nd DDS, the 3rd DDS and MCU.Described frequency dividing circuit is that dutycycle is adjustable, the analog filter filtering in the second shaping circuit be high-frequency signal and ultra-high frequency signal.
The connected mode of other circuit, the measuring principle of invention are identical with embodiment mono-.
When utilizing above-mentioned the first and second digital frequency mltiplier, can, by preset value being set therein as a multiplier of multiplying and regulating this preset value, reach controllability and controllability to feedback and result of calculation.
In the mode of word and accompanying drawing explanation, explained the structure of some embodiments of the present invention above, be not exhaustive or be limited to concrete form described above.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a High Precision Frequency device, it is characterized in that comprising caesium clock standard frequency generator, the first shaping circuit, the second shaping circuit, frequency multiplier circuit, phased follow circuit, high frequency standard frequency generator, signal strobe generator, the first digital frequency mltiplier, the second digital frequency mltiplier, the one DDS, the 2nd DDS, the 3rd DDS and MCU, wherein, the standard frequency that described caesium clock standard frequency generator produces is input to the first shaping circuit, the output terminal of the first shaping circuit is connected respectively to frequency multiplier circuit and phased follow circuit, the output terminal of described frequency multiplier circuit connects respectively the input end of high frequency standard frequency generator and the input end of the first digital frequency mltiplier, by measured frequency end, through the output of the second shaping circuit and the output of phased follow circuit, be imported into the first digital frequency mltiplier, the output terminal of the first digital frequency mltiplier connects signal strobe generator, the output terminal of signal strobe generator with by the output terminal of measured frequency end, be jointly connected to the input end of a DDS, by measured frequency end, through the second shaping circuit, be connected to an input end and the phased follow circuit of the second digital frequency mltiplier, two other input end of the second digital frequency mltiplier connects respectively the output terminal of a DDS and the output terminal of high frequency standard frequency generator, the second digital frequency mltiplier has two output terminals, one of them connects the input end of the 2nd DDS, another connects the input end of the 3rd DDS, the output terminal of the output terminal of the 2nd DDS and the 3rd DDS connects MCU, MCU output is by the measurement result of measured frequency.
2. High Precision Frequency device according to claim 1, is characterized in that described the first shaping circuit and the second shaping circuit comprise respectively amplifier and wave filter.
3. High Precision Frequency device according to claim 2, is characterized in that described the second shaping circuit also comprises digitizing shaping unit.
4. High Precision Frequency device according to claim 3, is characterized in that described digitizing shaping unit is iir filter.
5. High Precision Frequency device according to claim 1, is characterized in that replacing frequency multiplier circuit with the adjustable frequency dividing circuit of dutycycle.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104569580A (en) * | 2014-12-30 | 2015-04-29 | 安徽丹凤集团桐城玻璃纤维有限公司 | Broadband digital frequency meter |
| CN104991118A (en) * | 2015-08-10 | 2015-10-21 | 郑州轻工业学院 | High-resolution pilot frequency signal frequency measurement system and measurement method |
| CN108957123A (en) * | 2018-08-21 | 2018-12-07 | 南京航空航天大学 | Based on frequency-phase slope mapping microwave frequency measuring method and device |
| CN113092858A (en) * | 2021-04-12 | 2021-07-09 | 湖南师范大学 | High-precision frequency scale comparison system and comparison method based on time-frequency information measurement |
| CN113162612A (en) * | 2021-04-14 | 2021-07-23 | 中国原子能科学研究院 | Full-digital self-excitation loop |
| WO2022052128A1 (en) * | 2020-09-14 | 2022-03-17 | 深圳欣锐科技股份有限公司 | Voltage compensation method, apparatus, and device |
| CN114967418A (en) * | 2022-05-13 | 2022-08-30 | 南京尤尼泰信息科技有限公司 | Frequency signal measuring method and device based on satellite navigation signal |
| CN116599526A (en) * | 2023-07-17 | 2023-08-15 | 成都金诺信高科技有限公司 | High-precision frequency output control device and clock source |
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| CN104569580A (en) * | 2014-12-30 | 2015-04-29 | 安徽丹凤集团桐城玻璃纤维有限公司 | Broadband digital frequency meter |
| CN104991118A (en) * | 2015-08-10 | 2015-10-21 | 郑州轻工业学院 | High-resolution pilot frequency signal frequency measurement system and measurement method |
| CN104991118B (en) * | 2015-08-10 | 2017-07-25 | 郑州轻工业学院 | A kind of high-resolution alien frequencies signal frequency measuring system and measuring method |
| CN108957123A (en) * | 2018-08-21 | 2018-12-07 | 南京航空航天大学 | Based on frequency-phase slope mapping microwave frequency measuring method and device |
| CN108957123B (en) * | 2018-08-21 | 2019-09-17 | 南京航空航天大学 | Based on frequency-phase slope mapping microwave frequency measuring method and device |
| WO2022052128A1 (en) * | 2020-09-14 | 2022-03-17 | 深圳欣锐科技股份有限公司 | Voltage compensation method, apparatus, and device |
| CN113092858B (en) * | 2021-04-12 | 2022-04-12 | 湖南师范大学 | High-precision frequency scale comparison system and comparison method based on time-frequency information measurement |
| CN113092858A (en) * | 2021-04-12 | 2021-07-09 | 湖南师范大学 | High-precision frequency scale comparison system and comparison method based on time-frequency information measurement |
| CN113162612A (en) * | 2021-04-14 | 2021-07-23 | 中国原子能科学研究院 | Full-digital self-excitation loop |
| CN114967418A (en) * | 2022-05-13 | 2022-08-30 | 南京尤尼泰信息科技有限公司 | Frequency signal measuring method and device based on satellite navigation signal |
| CN114967418B (en) * | 2022-05-13 | 2023-09-05 | 南京尤尼泰信息科技有限公司 | Frequency signal measuring method and device based on satellite navigation signals |
| CN116599526A (en) * | 2023-07-17 | 2023-08-15 | 成都金诺信高科技有限公司 | High-precision frequency output control device and clock source |
| CN116599526B (en) * | 2023-07-17 | 2023-09-22 | 成都金诺信高科技有限公司 | High-precision frequency output control device and clock source |
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