CN202231700U - Servo circuit for rubidium atomic frequency standard as well as rubidium atomic frequency standard - Google Patents
Servo circuit for rubidium atomic frequency standard as well as rubidium atomic frequency standard Download PDFInfo
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- CN202231700U CN202231700U CN2011203151857U CN201120315185U CN202231700U CN 202231700 U CN202231700 U CN 202231700U CN 2011203151857 U CN2011203151857 U CN 2011203151857U CN 201120315185 U CN201120315185 U CN 201120315185U CN 202231700 U CN202231700 U CN 202231700U
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Abstract
The utility model discloses a servo circuit for a rubidium atomic frequency standard as well as a rubidium atomic frequency standard, belonging to the field of an atomic frequency standard. The servo circuit comprises an analogue-to-digital conversion circuit, a main control module and a digital-to-analogue conversion circuit, wherein the analogue-to-digital conversion circuit is used for sampling output signals of a physical system of the rubidium atomic frequency standard; the main control module is used for providing synchronous reference signals for the sampling of the analogue-to-digital conversion circuit and calculating a rectification voltage according to sampling signals output by the analogue-to-digital conversion circuit; and the digital-to-analogue conversion circuit is used for outputting the rectification voltage calculated by the main control module to a voltage-controlled crystal oscillator of the rubidium atomic frequency standard. The main control module is respectively connected with the voltage-controlled crystal oscillator of the rubidium atomic frequency standard, the analogue-to-digital conversion circuit and the analogue-to-digital conversion circuit. The rubidium atomic frequency standard comprises the physical system and an electronic circuit, wherein the electronic circuit comprises the servo circuit, the voltage-controlled crystal oscillator, a frequency mixer, a frequency multiplier and a synthesizer; and the servo circuit is the servo circuit for the rubidium atomic frequency standard. The servo circuit provided by the utility model can improve the output accuracy of the servo service and simplify the structure of the servo circuit.
Description
Technical field
The utility model relates to the atomic frequency standard field, particularly a kind of servo circuit and Rb atom frequency marking that is used for Rb atom frequency marking.
Background technology
Atomic frequency standard is a kind of frequency source with good, stable degree and accuracy, be widely used in location, the navigation of satellite and communicate by letter, field such as instrument and meter and astronomy.And Rb atom frequency marking becomes present application atomic frequency standard the most widely because of it has advantages such as volume is little, in light weight, low in energy consumption, cost is low.Rb atom frequency marking generally comprises physical system and electronic circuit two parts.Wherein, electronic circuit mainly comprises VCXO, synthesizer, frequency multiplier, frequency mixer and servo circuit.This servo circuit is used for the output frequency according to the quantum frequency discrimination signal controlling VCXO of said physical system output, thereby the output frequency of VCXO is locked on the resonance absorbing peak of courtyard.
Traditional servo circuit is the analog servomechanism circuit, generally is to be the basis with the analog multiplier, the switching regulator phase-sensitive detection circuit that adopts FET to form.Light inspection signal takes out fundamental signal through filtering, multiplies each other in analog multiplier with reference signal then, and analog multiplier output signal is through low pass filter, promptly obtains aforementioned correction voltage after filtering high-frequency signal.
In the process that realizes the utility model, the inventor finds that there is following problem at least in prior art:
Because the FET that uses is active device, its parameter is subject to the influence that environmental factor changes in the analog servomechanism circuit; And the analog multiplier that uses receives the influence of amplitude noise easily, and there is certain error in the correction voltage that it obtains; In addition, also more complicated of the circuit structure of analog servomechanism circuit.
The utility model content
For the accuracy of the correction voltage that improves servo circuit output and simplify the structure of servo circuit, the utility model embodiment provides a kind of servo circuit and Rb atom frequency marking that is used for Rb atom frequency marking.Said technical scheme is following:
On the one hand; The utility model embodiment provides a kind of servo circuit that is used for Rb atom frequency marking, and it comprises the analog to digital conversion circuit that is used for the output signal of the physical system of said Rb atom frequency marking is sampled, be used to the D/A converting circuit that analog-digital conversion circuit as described is sampled to be provided synchronous reference signal and output to the VCXO of said Rb atom frequency marking according to the correction voltage that the sampled signal of analog-digital conversion circuit as described output is calculated the main control module of correction voltage and is used for that said main control module is calculated; Said main control module links to each other with VCXO, analog-digital conversion circuit as described and the said D/A converting circuit of said Rb atom frequency marking respectively.
Further; Said main control module comprises: be used to analog-digital conversion circuit as described and sample and the synchronous reference signal of synchronous reference signal generation unit is provided, is used for the sampled signal of analog-digital conversion circuit as described output is carried out repeatedly the cumulative mean unit of cumulative mean and is used to calculate the correction voltage computing unit of difference of twice magnitude of voltage in front and back of said cumulative mean unit output, said synchronous reference signal generation unit links to each other with analog-digital conversion circuit as described with said VCXO respectively; Said cumulative mean unit links to each other with analog-digital conversion circuit as described with said correction voltage computing unit respectively; Said correction voltage computing unit links to each other with said D/A converting circuit.
Particularly, said main control module is a microprocessor.
Particularly, analog-digital conversion circuit as described is 16 modulus conversion chips.
Particularly, said D/A converting circuit is 20 figure place mould conversion chips.
Particularly, the scope of said correction voltage is 0～10V.
On the other hand, the utility model embodiment also provides a kind of Rb atom frequency marking, and it comprises physical system and electronic circuit, and said electronic circuit comprises servo circuit, VCXO, frequency mixer, frequency multiplier and synthesizer; Said VCXO links to each other with said servo circuit, said synthesizer and said frequency multiplier respectively; Said frequency multiplier links to each other with said frequency mixer; Said frequency mixer links to each other with said physical system with said synthesizer respectively; Said physical system links to each other with said servo circuit, it is characterized in that, said servo circuit is the aforesaid servo circuit that is used for Rb atom frequency marking.
The beneficial effect that the technical scheme that the utility model embodiment provides is brought is: said servo circuit has adopted digit chip to realize the collection of quantum frequency discrimination signal; Microprocessor can be adjusted the phase place of synchronous reference signal easily; Make the convenient adjusting of quantum frequency discrimination signal acquisition point, the voltage-controlled correction voltage that obtains more realistically; Like this, can reduce the error of servo circuit output, improve the accuracy of correction voltage and simplify the structure of servo circuit.
Description of drawings
In order to be illustrated more clearly in the technical scheme among the utility model embodiment; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a kind of servo circuit structural representation that is used for Rb atom frequency marking that the utility model embodiment 1 provides;
Fig. 2 is a kind of main control module structural representation that is used for the servo circuit of Rb atom frequency marking that the utility model embodiment 1 provides;
Fig. 3 is a kind of operation principle sketch map that is used for the servo circuit generation correction voltage of Rb atom frequency marking that the utility model embodiment 1 provides;
Fig. 4 is the structural representation of a kind of Rb atom frequency marking of providing of the utility model embodiment 2.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer, will combine accompanying drawing that the utility model execution mode is done to describe in detail further below.
Embodiment 1
Referring to Fig. 1, the utility model embodiment provides a kind of servo circuit 101 that is used for Rb atom frequency marking, and this servo circuit 101 comprises: main control module 1011, analog to digital conversion circuit 1012 and digital-to-analogue conversion circuit 1013; Main control module 1011 respectively with Rb atom frequency marking in VCXO 102, analog to digital conversion circuit 1012 and digital-to-analogue conversion circuit 1013 link to each other; Analog to digital conversion circuit 1012 links to each other with physical system 106; Digital-to-analogue conversion circuit 1013 links to each other with VCXO 102.
Wherein, analog to digital conversion circuit 1012 is used for the output signal of the physical system 106 of Rb atom frequency marking is sampled; Main control module 1011 is used to the sampled signal calculating correction voltage that analog to digital conversion circuit 1012 is sampled to be provided synchronous reference signal and export according to analog to digital conversion circuit 1012; The correction voltage that D/A converting circuit 1013 is used for that main control module 1011 is calculated outputs to the VCXO 102 of Rb atom frequency marking.
Particularly, main control module 1011 can adopt microprocessor.
Further, in the present embodiment, referring to Fig. 2, main control module 1011 comprises synchronous reference signal generation unit 1011a, cumulative mean unit 1011b and correction voltage computing unit 1011c; Synchronous reference signal generation unit 1011a links to each other with analog to digital conversion circuit 1012 with VCXO 102 respectively; Cumulative mean unit 1011b links to each other with analog to digital conversion circuit 1012 with correction voltage computing unit 1011c respectively; Correction voltage computing unit 1011c links to each other with D/A converting circuit 1013.
Wherein, synchronous reference signal generation unit 1011a is used to the synchronous reference signal that control analog to digital conversion circuit 1012 is provided for sampling, and the quantum frequency discrimination signal of 1012 pairs of physical systems of control analog to digital conversion circuit, 106 outputs is sampled; Cumulative mean unit 1011b is used for carrying out repeatedly the computing of cumulative mean according to the sampled value of analog to digital conversion circuit 1012 outputs; Correction voltage computing unit 1011c is used to calculate the difference of twice magnitude of voltage in front and back of cumulative mean unit (1011b) output, the voltage of promptly rectifying a deviation, and the correction voltage that calculates of the output of control D/A converting circuit 1013.
Wherein, the external clock reference source of main control module 1011 is the frequency signal of VCXO 102 outputs.In the present embodiment, the frequency signal of VCXO 102 is 40MHz, obviously, also can adopt 10MHz, 5MHz.The synchronous reference signal generation unit 1011a of main control module 1011 produces one road synchronous reference signal under the effect of the internal clocking reference source of 40MHz frequency signal, this synchronous reference signal can be 1: 1 low-frequency square-wave signal for duty ratio.What be worth explanation is, this synchronous reference signal is that the keying FM signal frequency that produces with the synthesizer 105 of atomic frequency standard is identical and the low-frequency square-wave signal of fixed skew arranged.Obviously, this keying FM signal also can be produced by main control module 1011, that is to say that this main control module 1011 can be shared with the synthesizer 105 of Rb atom frequency marking, and this knows for those skilled in the art, so no longer detail.
In the present embodiment, the synchronous reference signal that analog to digital conversion circuit 1012 produces according to main control module 1011 is sampled to the frequency discrimination signal of physical system 106 outputs, and sampled value is sent to main control module 1011; Particularly, when the quantum frequency discrimination signal of physical system 106 was sent to analog to digital conversion circuit 1012, the synchronous reference signal generation unit 1011a of main control module 1011 sampled along triggering analog to digital conversion circuit 1012 according to the sequential of synchronous reference signal.Wherein, the cycle of sampling can be provided with through main control module 1011 according to actual conditions; The number of times of obviously, in a sampling period, sampling also is provided with according to actual conditions.The sampling period of present embodiment setting is two/one-period of synchronous reference signal, and sampling number is twice.
Behind 1012 pairs of quantum frequency discriminations of analog to digital conversion circuit signal sampling, the analog voltage that sampling is obtained is passed to the cumulative mean unit 1011b of main control module 1011.Cumulative mean unit 1011b carries out the computing of cumulative mean according to sampled value.In the present embodiment, the scheme that adopts digital cumulative mean is in order to lower The noise in the correction voltage that obtains after the sampling processing.Quantum frequency discrimination signal to analog to digital conversion circuit 1012 samplings carries out cumulative mean, can realize the compression of sampling period less than the noise component of atomic frequency standard loop response time easily.What be worth explanation is, the noise that influence the short steady index of Rb atom frequency marking mainly is a white noise, and according to the signal statistics theory, this noise like can effectively suppress through cumulative mean; N time cumulative mean can improve signal to noise ratio
doubly.
In the present embodiment, D/A converting circuit 1013 is output correction voltage to VCXO 102 under main control module 1011 controls.
Particularly, the analog voltage that the front and back double sampling that the correction voltage computing unit 1011c of main control module 1011 transmits cumulative mean unit 1011b obtains carries out difference operation, obtains the result of difference operation, the voltage of promptly rectifying a deviation; And according to these correction voltage control D/A converting circuit 1013 outputs.
D/A converting circuit 1013 converts the result of difference operation to analog voltage signal, and voltage Δ V obtains rectifying a deviation; And Δ V acted on VCXO, make the output frequency generation respective change of VCXO.
For example, referring to Fig. 3, suppose a sequential of synchronous reference signal along the time, the twice pair of frequency discrimination signals sampling in analog to digital conversion circuit 1012 front and back obtains analog voltage and is respectively V1, V2 and V1＜V2; B sequential of synchronous reference signal along the time, the twice pair of frequency discrimination signals sampling in analog to digital conversion circuit 1012 front and back obtains analog voltage and is respectively V3, V4 and V3＞V4; Then D/A converting circuit 1013 voltage that obtains rectifying a deviation is respectively Δ Va=V1-V2, Δ Vb=V3-V4, and Δ Va be negative value, Δ Vb on the occasion of.Wherein, when D/A converting circuit 1013 is exported Δ Va to VCXO 102, with the output frequency step-down that makes VCXO 102; When D/A converting circuit 1013 is exported Δ Vb to VCXO 102, the output frequency that makes VCXO 102 is uprised.Obviously, when D/A converting circuit 1013 did not produce correction voltage, the output frequency of VCXO 102 was constant.
Particularly, analog to digital conversion circuit 1012 is 16 modulus conversion chips; D/A converting circuit 1013 is 20 figure place mould conversion chips.And the correction voltage range that servo circuit that present embodiment provides 101 produces is 0 to 10V.
Embodiment 2
Referring to Fig. 4, the utility model embodiment also provides a kind of Rb atom frequency marking, comprises physical system 106 and electronic circuit, and electronic circuit comprises servo circuit, VCXO 102, frequency mixer 103, frequency multiplier 104 and synthesizer 105;
Wherein, VCXO 102 links to each other with servo circuit, synthesizer 105 and frequency multiplier 104 respectively; Frequency multiplier 104 links to each other with frequency mixer 103; Frequency mixer 103 links to each other with physical system 106 with synthesizer 105 respectively; Physical system 106 links to each other with servo circuit.
Wherein, the servo circuit 101 of servo circuit for providing among the embodiment 1.
The operation principle of Rb atom frequency marking is known for those skilled in the art, omits at this and describes in detail.
The all or part of step that one of ordinary skill in the art will appreciate that realization the foregoing description can be accomplished through hardware; Also can instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
The above is merely the preferred embodiment of the utility model, and is in order to restriction the utility model, not all within the spirit and principle of the utility model, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (7)
1. servo circuit that is used for Rb atom frequency marking; It is characterized in that said servo circuit comprises: the analog to digital conversion circuit that is used for the output signal of the physical system of said Rb atom frequency marking is sampled, be used to the D/A converting circuit that analog-digital conversion circuit as described is sampled to be provided synchronous reference signal and output to the VCXO of said Rb atom frequency marking according to the correction voltage that the sampled signal of analog-digital conversion circuit as described output is calculated the main control module of correction voltage and is used for that said main control module is calculated; Said main control module links to each other with VCXO, analog-digital conversion circuit as described and the said D/A converting circuit of said Rb atom frequency marking respectively.
2. servo circuit according to claim 1; It is characterized in that; Said main control module comprises: be used to analog-digital conversion circuit as described and sample and the synchronous reference signal of synchronous reference signal generation unit is provided, is used for the sampled signal of analog-digital conversion circuit as described output is carried out repeatedly the cumulative mean unit of cumulative mean and is used to calculate the correction voltage computing unit of difference of twice magnitude of voltage in front and back of said cumulative mean unit output, said synchronous reference signal generation unit links to each other with analog-digital conversion circuit as described with said VCXO respectively; Said cumulative mean unit links to each other with analog-digital conversion circuit as described with said correction voltage computing unit respectively; Said correction voltage computing unit links to each other with said D/A converting circuit.
3. servo circuit according to claim 2 is characterized in that, said main control module is a microprocessor.
4. servo circuit according to claim 1 is characterized in that, analog-digital conversion circuit as described is 16 modulus conversion chips.
5. servo circuit according to claim 1 is characterized in that, said D/A converting circuit is 20 figure place mould conversion chips.
6. servo circuit according to claim 1 is characterized in that, the scope of said correction voltage is 0～10V.
7. a Rb atom frequency marking comprises physical system and electronic circuit, and said electronic circuit comprises servo circuit, VCXO, frequency mixer, frequency multiplier and synthesizer; Said VCXO links to each other with said servo circuit, said synthesizer and said frequency multiplier respectively; Said frequency multiplier links to each other with said frequency mixer; Said frequency mixer links to each other with said physical system with said synthesizer respectively; Said physical system links to each other with said servo circuit, it is characterized in that, said servo circuit is each described servo circuit of claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203151857U CN202231700U (en) | 2011-08-24 | 2011-08-24 | Servo circuit for rubidium atomic frequency standard as well as rubidium atomic frequency standard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203151857U CN202231700U (en) | 2011-08-24 | 2011-08-24 | Servo circuit for rubidium atomic frequency standard as well as rubidium atomic frequency standard |
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| Publication Number | Publication Date |
|---|---|
| CN202231700U true CN202231700U (en) | 2012-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203151857U Expired - Fee Related CN202231700U (en) | 2011-08-24 | 2011-08-24 | Servo circuit for rubidium atomic frequency standard as well as rubidium atomic frequency standard |
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| Country | Link |
|---|---|
| CN (1) | CN202231700U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103152038A (en) * | 2013-01-31 | 2013-06-12 | 江汉大学 | Passive rubidium atomic frequency standard servo system and quantum frequency discrimination method |
| CN104410415A (en) * | 2014-11-27 | 2015-03-11 | 江汉大学 | Improved passive atomic frequency scale |
| CN107437940A (en) * | 2017-09-11 | 2017-12-05 | 江汉大学 | A kind of atomic frequency standard device |
| CN115128936A (en) * | 2022-06-01 | 2022-09-30 | 西安空间无线电技术研究所 | Phase detection and integration device and method for digital servo of rubidium atomic clock |
-
2011
- 2011-08-24 CN CN2011203151857U patent/CN202231700U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103152038A (en) * | 2013-01-31 | 2013-06-12 | 江汉大学 | Passive rubidium atomic frequency standard servo system and quantum frequency discrimination method |
| CN103152038B (en) * | 2013-01-31 | 2016-05-04 | 江汉大学 | A kind of passive Rb atom frequency marking servo-drive system and quantum frequency discrimination method |
| CN104410415A (en) * | 2014-11-27 | 2015-03-11 | 江汉大学 | Improved passive atomic frequency scale |
| CN107437940A (en) * | 2017-09-11 | 2017-12-05 | 江汉大学 | A kind of atomic frequency standard device |
| CN115128936A (en) * | 2022-06-01 | 2022-09-30 | 西安空间无线电技术研究所 | Phase detection and integration device and method for digital servo of rubidium atomic clock |
| CN115128936B (en) * | 2022-06-01 | 2024-05-31 | 西安空间无线电技术研究所 | Phase detection and integration device and method for rubidium atomic clock digital servo |
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Granted publication date: 20120523 Termination date: 20130824 |