CN103067002A - Differential microwave type atomic frequency standard system - Google Patents
Differential microwave type atomic frequency standard system Download PDFInfo
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- CN103067002A CN103067002A CN2012105502895A CN201210550289A CN103067002A CN 103067002 A CN103067002 A CN 103067002A CN 2012105502895 A CN2012105502895 A CN 2012105502895A CN 201210550289 A CN201210550289 A CN 201210550289A CN 103067002 A CN103067002 A CN 103067002A
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Abstract
The invention discloses a differential microwave type atomic frequency standard system. The differential microwave type atomic frequency standard system is characterized by comprising a first atomic frequency standard unit, a second atomic frequency standard unit, a frequency mixing unit, a filtering unit, a counting unit and a direct digital synthesizer (DDS) correction unit, wherein the first atomic frequency standard unit is sequentially connected with the counting unit and the frequency mixing unit; the second atomic frequency standard unit is sequentially connected with the counting unit and the DDS correction unit; the frequency mixing unit is sequentially connected with the DDS correction unit and the filtering unit; and the counting unit is connected with the DDS correction unit. The counting unit counts the frequency of the first atomic frequency standard unit to obtain a frequency value M, and counts the frequency of the second atomic frequency standard unit to obtain a frequency value N; and the DDS correction unit corrects the numerical relationship of the M and the N according to a reference clock of the second atomic frequency standard unit and transmits the corrected M and the corrected N to the frequency mixing unit and then to the filtering unit. The differential microwave type atomic frequency standard system achieves the effect that when outside factors change, stable frequency signals can still be output.
Description
Technical field
The invention belongs to the Technology of Atomic Frequency Standards field, particularly a kind of differential type microwave-type atomic frequency standard system.
Background technology
The disjunction mark standard had been widely used in numerous areas when atomic frequency standard was exported as one with its stable frequency values, but the variation of operating ambient temperature, can cause fatal impact to atomic frequency standard internal physical system and electronic circuit, finally cause the unstable of atomic frequency standard complete machine output signal frequency.People overcome the impact of this respect by many methods in this respect: for example atomic frequency standard is placed under the isoperibol and works, or the unsettled impact of output signal frequency value that comes compensates to cause by inner parameter.
Summary of the invention
Technical problem to be solved by this invention is itself to start with from the atomic frequency standard system, and a kind of differential type microwave-type atomic frequency standard system that can realize the outputting stable frequency signal when extraneous factor changes is provided.
For solving the problems of the technologies described above, the invention provides a kind of differential type microwave-type atomic frequency standard system, comprising: the first atomic frequency standard unit, the second atomic frequency standard unit, mixing unit, filter unit, counting unit and DDS amending unit.Described the first atomic frequency standard unit is connected with described counting unit, described mixing unit successively; Described the second atomic frequency standard unit is connected with described counting unit, described DDS amending unit successively; Described mixing unit is connected with described DDS amending unit, described filter unit successively; Described counting unit is connected with described DDS amending unit.Wherein, described counting unit is carried out frequency counting to described the first atomic frequency standard unit and is obtained frequency values M under the reference clock of described the first atomic frequency standard unit, described the second atomic frequency standard unit is carried out frequency counting obtain frequency values N; Described DDS amending unit is revised described M, described N numerical relation under the reference clock of described the second atomic frequency standard unit; Described DDS amending unit transfers to described mixing unit with described revised M, N and carries out Frequency mixing processing; Described mixing unit with Frequency mixing processing after the frequency value F that obtains transfer to described filter unit and carry out filtering and process.
Further, described DDS amending unit comprises: central processing unit, DDS chip; Described central processing unit is connected with described counting unit, described DDS chip successively; Described DDS chip is connected with described the second atomic frequency standard unit, described mixing unit successively.
Further, described the first atomic frequency standard unit, described the second atomic frequency standard unit have identical temperature coefficient.
Further, the short-term frequency stability of described the first atomic frequency standard unit is better than the short-term frequency stability of described the second atomic frequency standard unit.
Further, the long-term frequency stability of described the first atomic frequency standard unit are better than the long-term frequency stability of described the second atomic frequency standard unit.
Further, through the revised M of described DDS amending unit, N numerical relation be: M=2N.
Further, described counting unit is to walk hour counter.
Further, described mixing unit is frequency mixer.
Further, described filter unit is filter.
A kind of differential type microwave-type atomic frequency standard provided by the invention system is characterized in that, comprising: the first atomic frequency standard unit, the second atomic frequency standard unit, mixing unit, filter unit, counting unit and DDS amending unit.The first atomic frequency standard unit is connected with counting unit, mixing unit successively; The second atomic frequency standard unit is connected with counting unit, DDS amending unit successively; The mixing unit is connected with DDS amending unit, filter unit successively; Counting unit is connected with the DDS amending unit.Wherein, counting unit is carried out frequency counting to the first atomic frequency standard unit and is obtained frequency values M under the reference clock of the first atomic frequency standard unit, the second atomic frequency standard unit is carried out frequency counting obtain frequency values N; The DDS amending unit is revised described M, N numerical relation under the reference clock of the second atomic frequency standard unit and revised M, N is transferred to the mixing unit; And then transfer to filter unit.The present invention realized when extraneous factor changes still can stable output frequency signal.Simultaneously, the present invention has characteristics simple in structure, easy to operate, that accuracy is high.
Description of drawings
A kind of differential type microwave-type atomic frequency standard system principle structured flowchart that Fig. 1 provides for the embodiment of the invention.
Wherein, 201-the first atomic frequency standard unit, 202-the second atomic frequency standard unit, 203-mixing unit, 204-filter unit, 205-counting unit, 206-DDS amending unit.
Embodiment
Below in conjunction with accompanying drawing, embodiment provided by the invention is described in further detail.
Referring to Fig. 1, a kind of differential type microwave-type atomic frequency standard system that the embodiment of the invention provides comprises: the first atomic frequency standard unit 201, the second atomic frequency standard unit 202, mixing unit 203, filter unit 204, counting unit 205 and DDS amending unit 206.Wherein, the first atomic frequency standard unit 201 is connected with counting unit 205, mixing unit 203 successively.The second atomic frequency standard unit 202 is connected with counting unit 205, DDS amending unit 206 successively.Mixing unit 203 is connected with DDS amending unit 206, filter unit 204 successively.Counting unit 205 is connected with DDS amending unit 206.
In the present embodiment, counting unit 205 is carried out frequency counting to the first atomic frequency standard unit 201 and is obtained frequency values M under the reference clock of the first atomic frequency standard unit 201, simultaneously the second atomic frequency standard unit 202 is carried out frequency counting and obtain frequency values N.DDS amending unit 206 is revised M, N numerical relation under the reference clock of the second atomic frequency standard unit 202.DDS amending unit 206 transfers to mixing unit 203 with revised M, N and carries out Frequency mixing processing.Mixing unit 203 transfers to filter unit 204 with the frequency value F that obtains after the Frequency mixing processing and carries out the filtering processing.The most at last output of the signal after filter unit 204 filtering are processed.
In the present embodiment, DDS amending unit 206 comprises: central processing unit, DDS chip.Wherein, central processing unit is connected with counting unit 205, DDS chip successively, is used for deciding the size of correction value and delivering to the frequency register of DDS chip internal according to the frequency values that obtains M, N from counting unit.The DDS chip is connected with the second atomic frequency standard unit 202, mixing unit 203 successively, be used under the reference clock of the second atomic frequency standard unit 202, according to the correction value that central processing unit determines DDS chip internal frequency register value is revised, and then exported suitable frequency signal and 203 carry out Frequency mixing processing to the mixing unit.
In the present embodiment, the first atomic frequency standard unit 201, the second atomic frequency standard unit 202 have identical temperature coefficient.Be that the system output signal frequency change value size and Orientation that causes of the variation of external working environment temperature is all identical.Simultaneously, the first atomic frequency standard unit 201 other performance except temperature performance is better than the second atomic frequency standard unit 202.
Preferably, the short-term frequency stability of the first atomic frequency standard unit 201 is better than the short-term frequency stability of the second atomic frequency standard unit 202.
Preferably, the long-term frequency stability of the first atomic frequency standard unit 201 are better than the long-term frequency stability of the second atomic frequency standard unit 202.
In the present embodiment, through DDS amending unit 206 revised M, N numerical relation be: M=2N.Concrete operation method is such as M=20.000000MHz before revising, and the decimal place of N=10.001000MHz(M, N is relevant with DDS chip figure place, and for example there are 48 bit frequency registers its inside of AD9852, and its frequency resolution can reach 2
48, for the frequency signal of 10MHz, distinguishable is 3.6 * 10
-8Hz).Requiring M in the present embodiment is 2 times of N, therefore central processing unit is under the prerequisite of access count unit 205 M that obtains, N value, send concrete correction value to the DDS chip, make it at the second atomic frequency standard unit 202 output frequency signal N(10.001000MHz) with reference under after the output correction frequency signal of frequency values N '=10.000000MHz are 2 times of N to mixing unit 203 to guarantee in the mixing unit 203 M of place.
Preferably, mixing unit 203 is frequency mixers.
Preferably, filter unit 204 is filters.
Preferably, counting unit 205 is to walk hour counter.
Below by theory analysis, a kind of differential type microwave-type atomic frequency standard system that proves that the embodiment of the invention provides when extraneous factor changes can realize the output frequency value stabilization.
Analytical proof:
In a kind of differential type microwave-type atomic frequency standard system that the present embodiment provides, establish:
Wherein, F
1, F
2, F
3It is respectively the frequency values of the first atomic frequency standard unit 201, the second atomic frequency standard unit 202,203 outputs of mixing unit; F
01, F
02, F
03It is respectively the frequency initial value of the first atomic frequency standard unit 201 behind the system stability, the second atomic frequency standard unit 202,203 outputs of mixing unit; v
1, v
2, v
3It is respectively the relative average frequency deviation of the first atomic frequency standard unit 201, the second atomic frequency standard unit 202, mixing unit 203.
Got by formula (3):
1, when the operating ambient temperature T of the first atomic frequency standard unit 201, the second atomic frequency standard unit 202 changes, will cause F
1=F
01+ Δ F
1, F
2=F
02+ Δ F
2, because the embodiment of the invention is the first atomic frequency standard unit 201 with uniform temp coefficient, the second atomic frequency standard unit 202 of selecting, therefore: Δ F
1=Δ F
2, substitution formula (4):
In the present embodiment, owing to being mixer action, F is arranged
03=F
01-F
02So, the relative average frequency deviation ν of formula (5)
3=0, the first identical atomic frequency standard unit 201 of temperature coefficient, the second atomic frequency standard unit 202 are selected in this explanation, when the frequency signal of acquisition is when variations in temperature after mixing unit 203 acts on, can't affect the output frequency of system, reach the purpose that improves stability.
2, when the output frequency of the first atomic frequency standard unit 201 that other factors (except temperature) causes, the second atomic frequency standard unit 202 changes, because the performance of the first atomic frequency standard unit 201 is better than the second atomic frequency standard unit 202(is better than the second atomic frequency standard unit 202 such as the short-term frequency stability of the first atomic frequency standard unit 201 short-term frequency stability in the present embodiment, the long-term frequency stability of the first atomic frequency standard unit 201 are better than the long-term frequency stability of the second atomic frequency standard unit 202), so the v in the assumption (1)
1With respect to v
2, can ignore, so can be got by formula (4):
At this moment, the present embodiment obtains F by DDS amending unit 206
01=2F
02Thereby, F
03=F
01-F
02=F
02, so formula (6) becomes:
ν
3＝-ν
2→(7)
The relative average frequency deviation that can be reflected as can be known the second atomic frequency standard unit 202 by formula (7) by the relative average frequency deviation of whole system after 203 processing of mixing unit, the conclusion that obtains of convolution (5) simultaneously, a kind of differential type microwave-type atomic frequency standard system that has proved that the embodiment of the invention provides when extraneous factor changes can realize the outputting stable frequency signal.
In actual applications, when external environment changes (such as temperature), according to tradition atomic frequency standard system independently, therefore its output signal frequency stability will be and influenced, but the differential type structure of the present invention's design, the signal frequency stability of frequency mixing module output can reflect the signal frequency stability of original independently atomic frequency standard system, and not changed by external environment and affect.
A kind of differential type microwave-type atomic frequency standard provided by the invention system is characterized in that, comprising: the first atomic frequency standard unit 201, the second atomic frequency standard unit 202, mixing unit 203, filter unit 204, counting unit 205 and DDS amending unit 206.The first atomic frequency standard unit 201 is connected with counting unit 205, mixing unit 203 successively; The second atomic frequency standard unit 202 is connected with counting unit 205, DDS amending unit 206 successively; Mixing unit 203 is connected with DDS amending unit 206, filter unit 204 successively; Counting unit 205 is connected with DDS amending unit 206.Wherein, counting unit 205 is carried out frequency counting to the first atomic frequency standard unit 201 and is obtained frequency values M under the reference clock of the first atomic frequency standard unit 201, the second atomic frequency standard unit 202 is carried out frequency counting obtain frequency values N; DDS amending unit 206 is revised M, N numerical relation under the reference clock of the second atomic frequency standard unit 202 and revised M, N is transferred to mixing unit 203; And then transfer to filter unit 204.The present invention realized when extraneous factor changes still can stable output frequency signal.Simultaneously, the present invention has characteristics simple in structure, easy to operate, that accuracy is high.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to example the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (9)
1. differential type microwave-type atomic frequency standard system, it is characterized in that, comprising: the first atomic frequency standard unit (201), the second atomic frequency standard unit (202), mixing unit (203), filter unit (204), counting unit (205) and DDS amending unit (206);
Described the first atomic frequency standard unit (201) is connected with described counting unit (205), described mixing unit (203) successively;
Described the second atomic frequency standard unit (202) is connected with described counting unit (205), described DDS amending unit (206) successively;
Described mixing unit (203) is connected with described DDS amending unit (206), described filter unit (204) successively;
Described counting unit (205) is connected with described DDS amending unit (206);
Wherein, described counting unit (205) is carried out frequency counting to described the first atomic frequency standard unit (201) and is obtained frequency values M under the reference clock of described the first atomic frequency standard unit (201), described the second atomic frequency standard unit (202) is carried out frequency counting obtain frequency values N; Described DDS amending unit (206) is revised described M, described N numerical relation under the reference clock of described the second atomic frequency standard unit (202); Described DDS amending unit (206) transfers to described mixing unit (203) with described revised M, N and carries out Frequency mixing processing; Described mixing unit (203) transfers to described filter unit (204) with the frequency value F that obtains after the Frequency mixing processing and carries out the filtering processing.
2. described differential type microwave-type atomic frequency standard system according to claim 1 is characterized in that, described DDS amending unit (206) comprising: central processing unit, DDS chip;
Described central processing unit is connected with described counting unit (205), described DDS chip successively;
Described DDS chip is connected with described the second atomic frequency standard unit (202), described mixing unit (203) successively.
3. described differential type microwave-type atomic frequency standard system according to claim 2 is characterized in that:
Described the first atomic frequency standard unit (201), described the second atomic frequency standard unit (202) have identical temperature coefficient.
4. described differential type microwave-type atomic frequency standard system according to claim 3 is characterized in that:
The short-term frequency stability of described the first atomic frequency standard unit (201) is better than the short-term frequency stability of described the second atomic frequency standard unit (202).
5. described differential type microwave-type atomic frequency standard system according to claim 3 is characterized in that:
The long-term frequency stability of described the first atomic frequency standard unit (201) are better than the long-term frequency stability of described the second atomic frequency standard unit (202).
6. each described differential type microwave-type atomic frequency standard system according to claim 1-5 is characterized in that:
Through the revised M of described DDS amending unit (206), N numerical relation be: M=2N.
7. described differential type microwave-type atomic frequency standard system according to claim 6 is characterized in that:
Described counting unit (205) is to walk hour counter.
8. described differential type microwave-type atomic frequency standard system according to claim 7 is characterized in that:
Described mixing unit (203) is frequency mixer.
9. described differential type microwave-type atomic frequency standard system according to claim 8 is characterized in that:
Described filter unit (204) is filter.
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| CN201210550289.5A CN103067002B (en) | 2012-12-17 | 2012-12-17 | Differential microwave type atomic frequency standard system |
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|---|---|---|---|
| CN201210550289.5A CN103067002B (en) | 2012-12-17 | 2012-12-17 | Differential microwave type atomic frequency standard system |
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| CN103067002B CN103067002B (en) | 2015-03-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105933003A (en) * | 2016-04-25 | 2016-09-07 | 中国科学院武汉物理与数学研究所 | Miniaturized rubidium atomic frequency standard radio-frequency circuit |
| CN107037723A (en) * | 2015-12-21 | 2017-08-11 | 精工爱普生株式会社 | Timing signal generator, electronic equipment and moving body |
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| CN2664290Y (en) * | 2003-06-24 | 2004-12-15 | 深圳市东方汉华软件技术有限公司 | A circuit structure for temperature-compensation and frequency correction of oscillation frequency source |
| US20050068115A1 (en) * | 2003-09-29 | 2005-03-31 | Ken Atsumi | Atomic oscillator |
| CN203086445U (en) * | 2012-12-17 | 2013-07-24 | 江汉大学 | Novel microwave atomic clock system |
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2012
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| CN2664290Y (en) * | 2003-06-24 | 2004-12-15 | 深圳市东方汉华软件技术有限公司 | A circuit structure for temperature-compensation and frequency correction of oscillation frequency source |
| US20050068115A1 (en) * | 2003-09-29 | 2005-03-31 | Ken Atsumi | Atomic oscillator |
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| WANG YUTAI.ETC: "Application of DDS Based on DSP in Rubidium Atomic Frequency Standard", 《THE EIGHTH INTERNATIONAL CONFERENCE ON ELECTRONIC MEASUREMENT AND INSTRUMENTS》, 16 August 2007 (2007-08-16) * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107037723A (en) * | 2015-12-21 | 2017-08-11 | 精工爱普生株式会社 | Timing signal generator, electronic equipment and moving body |
| CN105933003A (en) * | 2016-04-25 | 2016-09-07 | 中国科学院武汉物理与数学研究所 | Miniaturized rubidium atomic frequency standard radio-frequency circuit |
| CN105933003B (en) * | 2016-04-25 | 2018-07-17 | 中国科学院武汉物理与数学研究所 | A kind of rubidium frequency standards radio circuit |
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| CN103067002B (en) | 2015-03-18 |
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