CN103067002B - Differential microwave type atomic frequency standard system - Google Patents
Differential microwave type atomic frequency standard system Download PDFInfo
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- CN103067002B CN103067002B CN201210550289.5A CN201210550289A CN103067002B CN 103067002 B CN103067002 B CN 103067002B CN 201210550289 A CN201210550289 A CN 201210550289A CN 103067002 B CN103067002 B CN 103067002B
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- 238000012937 correction Methods 0.000 claims abstract description 43
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims description 16
- 230000007774 longterm Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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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 Technology of Atomic Frequency Standards field, particularly a kind of differential microwave type atomic frequency standard system.
Background technology
Atomic frequency standard exports using its stable frequency values and is widely used in numerous areas as disjunction mark standard when one, but the change of operating ambient temperature, fatal impact can be caused on atomic frequency standard internal physical system and electronic circuit, finally cause the instability of atomic frequency standard complete machine output signal frequency.People overcome the impact of this respect by many methods in this respect: work under such as atomic frequency standard being placed on an isoperibol, or carry out the impact of the output signal frequency value instability that compensates causes by inner parameter.
Summary of the invention
Technical problem to be solved by this invention itself is started with from atomic frequency standard system, provides a kind of differential microwave type atomic frequency standard system that can realize outputting stable frequency signal when extraneous factor changes.
For solving the problems of the technologies described above, the invention provides a kind of differential 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 correction unit.Described first atomic frequency standard unit is connected with described counting unit, described mixing unit successively; Described second atomic frequency standard unit is connected with described counting unit, described DDS correction unit successively; Described mixing unit is connected with described DDS correction unit, described filter unit successively; Described counting unit is connected with described DDS correction unit.Wherein, described counting unit is carried out frequency counting to described first atomic frequency standard unit and is obtained frequency values M under the reference clock of described first atomic frequency standard unit, carries out frequency counting obtain frequency values N to described second atomic frequency standard unit; Described DDS correction unit is revised described M, described N numerical relation under the reference clock of described second atomic frequency standard unit; Described revised M, N are transferred to described mixing unit and carry out Frequency mixing processing by described DDS correction unit; Described mixing unit by after Frequency mixing processing obtain frequency value F and transfer to described filter unit and carry out filtering process.
Further, described DDS correction 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 second atomic frequency standard unit, described mixing unit successively.
Further, described first atomic frequency standard unit, described second atomic frequency standard unit have identical temperature coefficient.
Further, the short-term frequency stability of described first atomic frequency standard unit is better than the short-term frequency stability of described second atomic frequency standard unit.
Further, the long-term frequency stability of described first atomic frequency standard unit are better than the long-term frequency stability of described second atomic frequency standard unit.
Further, through revised M, N numerical relation of described DDS correction unit be: M=2N.
Further, described counting unit walks hour counter.
Further, described mixing unit is frequency mixer.
Further, described filter unit is filter.
A kind of differential microwave type atomic frequency standard system provided by the invention, 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 correction unit.First atomic frequency standard unit is connected with counting unit, mixing unit successively; Second atomic frequency standard unit is connected with counting unit, DDS correction unit successively; Mixing unit is connected with DDS correction unit, filter unit successively; Counting unit is connected with DDS correction 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, carries out frequency counting obtain frequency values N to the second atomic frequency standard unit; DDS correction unit is revised described M, N numerical relation and revised M, N is transferred to mixing unit under the reference clock of the second atomic frequency standard unit; And then transfer to filter unit.Present invention achieves when extraneous factor changes still can the frequency signal of stable output.Meanwhile, the present invention has the advantages that structure is simple, easy to operate, accuracy is high.
Accompanying drawing explanation
A kind of differential microwave type atomic frequency standard system theory structure block diagram that Fig. 1 provides for the embodiment of the present invention.
Wherein, 201-first atomic frequency standard unit, 202-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.
See Fig. 1, a kind of differential microwave type atomic frequency standard system that the embodiment of the present invention provides, comprising: the first atomic frequency standard unit 201, second atomic frequency standard unit 202, mixing unit 203, filter unit 204, counting unit 205 and DDS correction unit 206.Wherein, the first atomic frequency standard unit 201 is connected with counting unit 205, mixing unit 203 successively.Second atomic frequency standard unit 202 is connected with counting unit 205, DDS correction unit 206 successively.Mixing unit 203 is connected with DDS correction unit 206, filter unit 204 successively.Counting unit 205 is connected with DDS correction 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, carries out frequency counting simultaneously obtain frequency values N to the second atomic frequency standard unit 202.DDS correction unit 206 is revised M, N numerical relation under the reference clock of the second atomic frequency standard unit 202.Revised M, N are transferred to mixing unit 203 and carry out Frequency mixing processing by DDS correction unit 206.Mixing unit 203 by after Frequency mixing processing obtain frequency value F and transfer to filter unit 204 and carry out filtering process.Signal the most at last after filter unit 204 filtering process exports.
In the present embodiment, DDS correction unit 206 comprises: central processing unit, DDS chip.Wherein, central processing unit is connected with counting unit 205, DDS chip successively, for deciding the size of correction value according to the frequency values obtaining M, N from counting unit and delivering to the frequency register of DDS chip internal.DDS chip is connected with the second atomic frequency standard unit 202, mixing unit 203 successively, for 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 export suitable frequency signal and carry out Frequency mixing processing to mixing unit 203.
In the present embodiment, the first atomic frequency standard unit 201, second atomic frequency standard unit 202 has identical temperature coefficient.Namely the system output signal frequency change size and Orientation that causes of the change of external working environment temperature is all identical.Meanwhile, 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 revised M, N numerical relation of DDS correction unit 206 be: M=2N.Concrete operation method as: revise before M=20.000000MHz, N=10.001000MHz(M, N decimal place relevant with DDS chip figure place, such as 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).Require in the present embodiment that M is 2 times of N, therefore central processing unit access count unit 205 obtain the prerequisite of M, N value under, send concrete correction value in DDS chip, make it at the second atomic frequency standard unit 202 output frequency signal N(10.001000MHz) with reference to lower export revise after the frequency signal of frequency values N '=10.000000MHz to mixing unit 203, to ensure being 2 times of N at mixing unit 203 place M.
Preferably, mixing unit 203 is frequency mixers.
Preferably, filter unit 204 is filters.
Preferably, counting unit 205 walks hour counter.
Below by theory analysis, prove that a kind of differential microwave type atomic frequency standard system that the embodiment of the present invention provides when extraneous factor changes can realize output frequency value stabilization.
Analytical proof:
In a kind of differential microwave type atomic frequency standard system that the present embodiment provides, if:
Wherein, F
1, F
2, F
3the frequency values of the first atomic frequency standard unit 201, second atomic frequency standard unit 202, mixing unit 203 output respectively; F
01, F
02, F
03the frequency initial value of the first atomic frequency standard unit 201, second atomic frequency standard unit 202 after system stability, mixing unit 203 output respectively; v
1, v
2, v
3the relative average frequency deviation of the first atomic frequency standard unit 201, second atomic frequency standard unit 202, mixing unit 203 respectively.
Obtained by formula (3):
1, when the operating ambient temperature T of the first atomic frequency standard unit 201, second atomic frequency standard unit 202 changes, F will be caused
1=F
01+ Δ F
1, F
2=F
02+ Δ F
2, because the embodiment of the present invention is first atomic frequency standard unit 201, second atomic frequency standard unit 202 with identical temperature coefficient selected, therefore: Δ F
1=Δ F
2, substitute into formula (4) and obtain:
In the present embodiment, owing to being mixer action, there is F
03=F
01-F
02, so the relative average frequency deviation ν of formula (5)
3=0, this illustrates the first atomic frequency standard unit 201, second atomic frequency standard unit 202 selecting temperature coefficient identical, the frequency signal obtained after mixing unit 203 acts on when the temperature is changed, can't the output frequency of influential system, reaches the object improving stability.
2, when the output frequency change of the first atomic frequency standard unit 201, second atomic frequency standard unit 202 that other factors (apart from the temperature) causes, because the performance of the first atomic frequency standard unit 201 in the present embodiment is better than the short-term frequency stability that the short-term frequency stability of the second atomic frequency standard unit 202(as the first atomic frequency standard unit 201 be better than the second atomic frequency standard unit 202, 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), the v therefore in assumption (1)
1relative to v
2, can ignore, so can be obtained by formula (4):
Now, the present embodiment obtains F by DDS correction unit 206
01=2F
02, thus F
03=F
01-F
02=F
02, therefore formula (6) becomes:
ν
3＝-ν
2→(7)
The relative average frequency deviation of the second atomic frequency standard unit 202 can be reflected by the known relative average frequency deviation processing rear whole system by mixing unit 203 of formula (7), the simultaneously conclusion that obtains of convolution (5), a kind of differential microwave type atomic frequency standard system that demonstrating the embodiment of the present invention when extraneous factor changes provides can realize outputting stable frequency signal.
In actual applications, when external environment changes (as temperature), traditionally independently atomic frequency standard system, its output signal frequency stability will be therefore influenced, but the differential type structure of the present invention's design, the signal frequency stability that frequency mixing module exports can reflect the signal frequency stability of original independently atomic frequency standard system, and can not affect by external environment change.
A kind of differential microwave type atomic frequency standard system provided by the invention, is characterized in that, comprising: the first atomic frequency standard unit 201, second atomic frequency standard unit 202, mixing unit 203, filter unit 204, counting unit 205 and DDS correction unit 206.First atomic frequency standard unit 201 is connected with counting unit 205, mixing unit 203 successively; Second atomic frequency standard unit 202 is connected with counting unit 205, DDS correction unit 206 successively; Mixing unit 203 is connected with DDS correction unit 206, filter unit 204 successively; Counting unit 205 is connected with DDS correction 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, carries out frequency counting obtain frequency values N to the second atomic frequency standard unit 202; DDS correction unit 206 is revised M, N numerical relation and revised M, N is transferred to mixing unit 203 under the reference clock of the second atomic frequency standard unit 202; And then transfer to filter unit 204.Present invention achieves when extraneous factor changes still can the frequency signal of stable output.Meanwhile, the present invention has the advantages that structure is simple, easy to operate, accuracy is high.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (9)
1. a differential 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 correction unit (206);
Described first atomic frequency standard unit (201) is connected with described counting unit (205), described mixing unit (203) successively;
Described second atomic frequency standard unit (202) is connected with described counting unit (205), described DDS correction unit (206) successively;
Described mixing unit (203) is connected with described DDS correction unit (206), described filter unit (204) successively;
Described counting unit (205) is connected with described DDS correction unit (206);
Wherein, described counting unit (205) is carried out frequency counting to described first atomic frequency standard unit (201) and is obtained frequency values M under the reference clock of described first atomic frequency standard unit (201), carries out frequency counting obtain frequency values N to described second atomic frequency standard unit (202); Described DDS correction unit (206) is revised described M, described N numerical relation under the reference clock of described second atomic frequency standard unit (202); Described revised M, N are transferred to described mixing unit (203) and carry out Frequency mixing processing by described DDS correction unit (206); Described mixing unit (203) by after Frequency mixing processing obtain frequency value F and transfer to described filter unit (204) and carry out filtering process.
2. differential microwave type atomic frequency standard system according to claim 1, it is characterized in that, described DDS correction 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 second atomic frequency standard unit (202), described mixing unit (203) successively.
3. differential microwave type atomic frequency standard system according to claim 2, is characterized in that:
Described first atomic frequency standard unit (201), described second atomic frequency standard unit (202) have identical temperature coefficient.
4. differential microwave type atomic frequency standard system according to claim 3, is characterized in that:
The short-term frequency stability of described first atomic frequency standard unit (201) is better than the short-term frequency stability of described second atomic frequency standard unit (202).
5. differential microwave type atomic frequency standard system according to claim 3, is characterized in that:
The long-term frequency stability of described first atomic frequency standard unit (201) are better than the long-term frequency stability of described second atomic frequency standard unit (202).
6. differential microwave type atomic frequency standard system according to any one of claim 1-5, is characterized in that:
Through revised M, N numerical relation of described DDS correction unit (206) be: M=2N.
7. differential microwave type atomic frequency standard system according to claim 6, is characterized in that:
Described counting unit (205) walks hour counter.
8. differential microwave type atomic frequency standard system according to claim 7, is characterized in that:
Described mixing unit (203) is frequency mixer.
9. differential microwave type atomic frequency standard system according to claim 8, is characterized in that:
Described filter unit (204) is filter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210550289.5A CN103067002B (en) | 2012-12-17 | 2012-12-17 | Differential microwave type atomic frequency standard system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210550289.5A CN103067002B (en) | 2012-12-17 | 2012-12-17 | Differential microwave type atomic frequency standard system |
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| Publication Number | Publication Date |
|---|---|
| CN103067002A CN103067002A (en) | 2013-04-24 |
| CN103067002B true CN103067002B (en) | 2015-03-18 |
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|---|---|---|---|
| CN201210550289.5A Expired - Fee Related CN103067002B (en) | 2012-12-17 | 2012-12-17 | Differential microwave type atomic frequency standard system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6627489B2 (en) * | 2015-12-21 | 2020-01-08 | セイコーエプソン株式会社 | Timing signal generator and electronic equipment |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN203086445U (en) * | 2012-12-17 | 2013-07-24 | 江汉大学 | Novel microwave atomic clock system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005109619A (en) * | 2003-09-29 | 2005-04-21 | Fujitsu Ltd | Atomic oscillator |
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2012
- 2012-12-17 CN CN201210550289.5A patent/CN103067002B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN203086445U (en) * | 2012-12-17 | 2013-07-24 | 江汉大学 | Novel microwave atomic clock system |
Non-Patent Citations (2)
| Title |
|---|
| AD9852在小型铷频标频率综合电路中的应用;郭斌等;《空间电子技术》;20100925(第3期);全文 * |
| Application of DDS Based on DSP in Rubidium Atomic Frequency Standard;Wang Yutai.etc;《The Eighth International Conference on Electronic Measurement and Instruments》;20070816;第4-908页至第4-912页 * |
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Granted publication date: 20150318 |