CN102035549A - Synchronous phase discriminating device and method of rubidium atomic frequency standard - Google Patents
Synchronous phase discriminating device and method of rubidium atomic frequency standard Download PDFInfo
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- CN102035549A CN102035549A CN 201010565472 CN201010565472A CN102035549A CN 102035549 A CN102035549 A CN 102035549A CN 201010565472 CN201010565472 CN 201010565472 CN 201010565472 A CN201010565472 A CN 201010565472A CN 102035549 A CN102035549 A CN 102035549A
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Abstract
The invention discloses a synchronous phase discriminating device of a rubidium atomic frequency standard, comprising a measuring and displaying module, a phase regulating module and a synchronous phase discriminating module, wherein the measuring and displaying module is used for measuring and displaying phase shift in a quantum frequency discrimination signal transmitted by a physical system; the phase regulating module is used for regulating the phase of a synchronous phase discriminating reference signal transmitted by a microprocessor according to the phase shift in the quantum frequency discrimination signal measured and displayed by the measuring and displaying module in order to buck the phase shift in the quantum frequency discrimination signal; and the synchronous phase discriminating module is used for converting the phase difference between the quantum frequency discrimination signal and the synchronous phase discriminating reference signal regulated by the phase regulating module into a voltage control signal in order to regulate the output frequency of a voltage controlled crystal oscillator. The synchronous phase discriminating device can regulate the phase of the synchronous phase discriminating reference signal, thereby correcting frequency departure and increasing the stability of the output frequency of the rubidium atomic frequency standard. The invention also discloses a synchronous phase discriminating method of the rubidium atomic frequency standard.
Description
Technical field
The present invention relates to the inactive type rubidium atom frequency scale field, relate in particular to a kind of synchronous phase demodulation apparatus and synchronous phase detecting method thereof of 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 the atomic frequency standard that is most widely used at present because of it has advantages such as volume is little, in light weight, low in energy consumption, cost is low.
Rb atom frequency marking mainly comprises VCXO, physical system and electronic circuit.Physical system comprises that specifically the spectroscopic lamp of generation pumping light, the integrated filtering resonance bubble of storage rubidium atom, the microwave cavity of storing microwave field, generation are parallel to the photocell of the C field coil (being uniform magnetic field coil) of the magnetostatic field of described microwave cavity axis, sensed light signal, microwave is coupled into the coupling loop of described microwave cavity and prevents the magnetic cup that magnetostatic field penetrates.Electronic circuit specifically comprises radio frequency frequency multiplication module and comprehensive servo module.Comprehensive servo module comprise be used to produce frequency synthesis instruction, keying FM signal, synchronously the phase demodulation reference signal microprocessor, digital frequency synthesizer that the frequency synthesis instruction that is used for producing according to microprocessor produces comprehensive modulation signal, be used for synchronous phase demodulation module that the quantum frequency discrimination signal that physical system produces is carried out the frequency-selecting amplifying unit of frequency-selecting and amplification and is used to carry out synchronous phase demodulation.Radio frequency frequency multiplication module comprise that the output frequency that is used for VCXO carries out the radio frequency frequency multiplication unit of frequency multiplication and the microwave that is used for the comprehensive modulation signal that output frequency and digital frequency synthesizer through the VCXO after the described radio frequency frequency multiplication unit frequency multiplication produce is carried out frequency multiplication and mixing doubly, the mixing unit.
Yet in Rb atom frequency marking, radio frequency frequency multiplication unit, microwave are doubly, mixing unit and frequency-selecting amplifying unit all can introduce phase shift.Below to radio frequency frequency multiplication unit, microwave doubly, the process of the phase shift introduced of mixing unit and frequency-selecting amplifying unit does an explanation for example.
Suppose that the comprehensive modulation signal that digital frequency synthesizer produces is:
S＝Asin(2πft) (1)
This comprehensive modulation signal and through the output frequency signal of the VCXO of radio frequency frequency multiplication unit together through microwave doubly, after the mixing unit carries out acting on physical system after frequency multiplication and the mixing, the quantum frequency discrimination signal of physical system output is:
S
1＝ABsin(2πft+φ+φ
1) (2)
Wherein, φ=0 ° or 180 °, φ
1Be radio frequency frequency multiplication unit and microwave doubly, the phase shift introduced of mixing unit;
After quantum frequency discrimination signal carried out frequency-selecting and amplification through the frequency-selecting amplifying unit, the quantum frequency discrimination signal of frequency-selecting amplifying unit output was:
S
2＝K
aABsin(2πft+φ+φ
1+φ
2) (3)
Wherein, φ
2It is the phase shift that the frequency-selecting amplifying unit is introduced;
Above-mentioned quantum frequency discrimination signal passes through after the synchronous phase demodulation module phase demodulation, and filters after the alternating current component through integrator, and the voltage-controlled voltage signal of phase demodulation module output synchronously is:
By formula (3) and formula (4) as can be known, quantum frequency discrimination signal and have φ between the phase demodulation reference signal synchronously
1+ φ
2Phase difference, this phase difference can cause quantum frequency discrimination signal and synchronously the phase demodulation reference signal can not be positioned at effective voltage difference acquisition zone simultaneously, make that the identified result of synchronous phase demodulation module is that voltage-controlled voltage also exists φ
1+ φ
2Phase difference, exist the identified result of phase difference to act on VCXO after, can cause that the output frequency of VCXO drifts about, thereby influence the stability of Rb atom frequency marking output frequency.
Therefore, be necessary to provide a kind of synchronous phase demodulation apparatus of improved Rb atom frequency marking to overcome above-mentioned defective.
Summary of the invention
The purpose of this invention is to provide a kind of synchronous phase demodulation apparatus and synchronous phase detecting method thereof of Rb atom frequency marking, can carry out the phase place adjustment synchronous phase demodulation reference signal, thus the correction of frequency drift, and then the stability of raising Rb atom frequency marking output frequency.
To achieve these goals, the invention provides a kind of synchronous phase demodulation apparatus of Rb atom frequency marking, comprising: measure display module, be used for measuring and showing the phase shift of the quantum frequency discrimination signal that physical system sends; Phase adjusting module is used for the phase shift according to the described quantum frequency discrimination signal of described measurement display module measurement and demonstration, adjusts the phase place of the synchronous phase demodulation reference signal of microprocessor transmission, to offset the phase shift in the described quantum frequency discrimination signal; The phase demodulation module is used for being converted to voltage control signal with described quantum frequency discrimination signal with through the phase difference between the described synchronous phase demodulation reference signal after the described phase adjusting module adjustment, to adjust the output frequency of described VCXO synchronously.
Preferably, described measurement display module is an oscilloscope.
Preferably, described synchronous phase demodulation module is a phase discriminator.
Preferably, described phase adjusting module comprises resistance and the electric capacity of connecting with described resistance.
Preferably, described phase adjusting module is a timer conter.
Correspondingly, the present invention also provides a kind of synchronous phase detecting method of Rb atom frequency marking, comprising: (1) obtains the phase shift in the quantum frequency discrimination signal that physical system sends; (2), adjust the phase place of the synchronous phase demodulation reference signal of microprocessor transmission according to described phase shift; (3) calculate phase difference between described quantum frequency discrimination signal and the described synchronous phase demodulation reference signal, and described phase difference is converted to voltage control signal, to adjust the output frequency of VCXO.
Compared with prior art, the present invention by phase adjusting module according to the quantum frequency discrimination characterization of physical system by radio frequency frequency multiplication unit, microwave doubly, the phase place of the synchronous phase demodulation reference signal of the adjustment of in-migration mutually introduced of mixing unit and frequency-selecting amplifying unit, make quantum frequency discrimination signal and synchronous phase demodulation reference signal be positioned at effective voltage difference acquisition zone, thereby improved the accuracy of the identified result of synchronous phase demodulation module, correct the frequency drift of VCXO, and then improved the stability of Rb atom frequency marking output frequency.
By following description also in conjunction with the accompanying drawings, it is more clear that the present invention will become, and these accompanying drawings are used to explain embodiments of the invention.
Description of drawings
Fig. 1 is the structured flowchart of the synchronous phase demodulation apparatus of Rb atom frequency marking of the present invention.
Fig. 2 is the structural representation of the Rb atom frequency marking of the synchronous phase demodulation apparatus of use Rb atom frequency marking of the present invention.
Fig. 3 is the flow chart of synchronous phase detecting method of the present invention.
Fig. 4 when not adopting the synchronous phase demodulation apparatus of Rb atom frequency marking of the present invention, the quantum frequency discrimination signal and the oscillogram of phase demodulation reference signal synchronously.
Behind the synchronous phase demodulation apparatus of Fig. 5 for employing Rb atom frequency marking of the present invention, the oscillogram of quantum frequency discrimination signal and synchronous phase demodulation reference signal.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, the similar elements label is represented similar elements in the accompanying drawing.
With reference to Fig. 1-2, use the Rb atom frequency marking of the synchronous phase demodulation apparatus of Rb atom frequency marking of the present invention to comprise: VCXO 10, isolated amplifier 11, radio frequency frequency multiplication unit 12, microwave doubly, mixing unit 13, physical system 14, frequency-selecting amplifying unit 15, phase demodulation apparatus 16, microcontroller 17 and digital frequency synthesizer 18 synchronously.Send to described radio frequency frequency multiplication unit 12 after the isolation of the described isolated amplifier 11 of output frequency elder generation process of described VCXO 10 and the amplification and carry out frequency multiplication.Simultaneously, described microprocessor 17 transmission frequency synthetic instructions produce comprehensive modulation signal for described digital frequency synthesizer 18, and sending the keying FM signal, to make described digital frequency synthesizer 18 be alternately to export described comprehensive modulation signal the cycle with the frequency of described keying FM signal.The output frequency of the described VCXO 10 of described comprehensive modulation signal and process frequency multiplication carries out producing the microwave interrogation signals after frequency multiplication and the mixing together.Described microwave interrogation signals produces quantum frequency discrimination signal through the frequency discrimination of described physical system 14, and enter described synchronous phase demodulation apparatus 16 and carry out phase demodulation, the voltage control signal of phase demodulation generation synchronously can act on described VCXO 10, to adjust the output frequency of described VCXO 10.
Particularly, described physical system 14 comprises the spectroscopic lamp 141 that produces pumping light, the integrated filtering resonance bubble 142 of storage rubidium atom, the microwave cavity 143 of storage microwave field, generation is parallel to the C field coil 144 of the magnetostatic field of described microwave cavity axis, sensed light signal is the photocell 145 of quantum frequency discrimination signal, the microwave interrogation signals is coupled into the coupling loop 146 of described microwave cavity, prevent the magnetic cup 147 that magnetostatic field penetrates, make described spectroscopic lamp 141 and described microwave cavity 143 keep the described temperature control modules 148 of temperature constant state and the constant-current source 149 that electric current is provided for described C field coil 144.
Described synchronous phase demodulation apparatus 16 comprises measures display module 161, phase adjusting module 162 and synchronous phase demodulation module 163.Described measurement display module 161 is used for measuring and showing the phase shift of the quantum frequency discrimination signal that described photocell 145 sends; Described phase adjusting module 162 is used for the phase shift according to the described quantum frequency discrimination signal of described measurement display module 161 measurements and demonstration, adjust the phase place of the synchronous phase demodulation reference signal of described microprocessor 17 transmissions, to offset the phase shift in the described quantum frequency discrimination signal; Described synchronous phase demodulation module 163 is used for being converted to voltage control signal U with described quantum frequency discrimination signal with through the phase difference between the described synchronous phase demodulation reference signal after described phase adjusting module 162 adjustment, to adjust the output frequency f of described VCXO 10.Preferably, in the present embodiment, described measurement display module 161 is an oscilloscope, and described synchronous phase demodulation module 163 is a phase discriminator, and described phase adjusting module 162 is a timer conter.In another embodiment of invention, described phase adjusting module 162 is the delay circuit of being made up of the resistance and the electric capacity of connecting with described resistance.
Understandably, described voltage control signal U sends to described VCXO 10 again through after the digital-to-analogue conversion of described microprocessor 17, to adjust the output frequency f of described VCXO 10.
Fig. 3 is the flow chart of synchronous phase detecting method of the present invention.The synchronous phase detecting method of the present invention comprises the steps:
Step S1, obtain by radio frequency frequency multiplication unit, microwave doubly, mixing unit and frequency-selecting amplifying unit be incorporated into the phase shift in the quantum frequency discrimination signal that physical system sends;
Step S2, according to described phase shift, the square-wave signal that adopts timer conter to export is adjusted the phase place of the synchronous phase demodulation reference signal of microprocessor transmission;
Step S3 calculates the phase difference between described quantum frequency discrimination signal and the described synchronous phase demodulation reference signal, and described phase difference is converted to voltage control signal, to adjust the output frequency of VCXO.
With reference to figure 4-5, A, B are the voltage difference pickup area of synchronous phase demodulation reference signal Y among the figure, and C is district's relaxation time of rubidium atomic spin, and D is the sampled point of synchronous phase demodulation reference signal Y, and X represents quantum frequency discrimination signal.As shown in Figure 4, when having phase shift among the quantum frequency discrimination signal X, the sampled point D of the synchronous phase demodulation reference signal Y of process phase place adjustment is not positioned at district C relaxation time of rubidium atomic spin, like this, can't carry out phase demodulation to quantum frequency discrimination signal X.As shown in Figure 5, when having phase shift among the quantum frequency discrimination signal X, two sampled point D of the described phase adjusting module 16 adjusted synchronous phase demodulation reference signal Y of process lay respectively at voltage difference pickup area A and B, so just can carry out phase demodulation to quantum frequency discrimination signal X.
As mentioned above, the present invention is by the phase place of described phase adjusting module 162 according to the synchronous phase demodulation reference signal of phase shift adjustment in the quantum frequency discrimination signal of measuring, make quantum frequency discrimination signal and synchronous phase demodulation reference signal be positioned at effective voltage difference acquisition zone, thereby improved the accuracy of the identified result of described synchronous phase demodulation module 163, correct the frequency drift of described VCXO 10, and then improved the stability of Rb atom frequency marking output frequency.
Above invention has been described in conjunction with most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, and should contain various modification, equivalent combinations of carrying out according to essence of the present invention.
Claims (6)
1. the synchronous phase demodulation apparatus of a Rb atom frequency marking comprises:
Measure display module, be used for measuring and showing the phase shift of the quantum frequency discrimination signal that physical system sends;
The phase demodulation module is used for the phase difference between the synchronous phase demodulation reference signal of described quantum frequency discrimination signal and microprocessor transmission is converted to voltage control signal, to adjust the output frequency of described VCXO synchronously;
It is characterized in that, also comprise:
Phase adjusting module is used for the phase shift according to the described quantum frequency discrimination signal of described measurement display module measurement and demonstration, adjusts the phase place of described synchronous phase demodulation reference signal, to offset the phase shift in the described quantum frequency discrimination signal.
2. the synchronous phase demodulation apparatus of Rb atom frequency marking as claimed in claim 1 is characterized in that, described measurement display module is an oscilloscope.
3. the synchronous phase demodulation apparatus of Rb atom frequency marking as claimed in claim 1 is characterized in that, described synchronous phase demodulation module is a phase discriminator.
4. the synchronous phase demodulation apparatus of Rb atom frequency marking as claimed in claim 3 is characterized in that, described phase adjusting module comprises resistance and the electric capacity of connecting with described resistance.
5. the synchronous phase demodulation apparatus of Rb atom frequency marking as claimed in claim 3 is characterized in that, described phase adjusting module is a timer conter.
6. the synchronous phase detecting method of a Rb atom frequency marking comprises:
(1) obtains phase shift in the quantum frequency discrimination signal that physical system sends;
(2), adjust the phase place of the synchronous phase demodulation reference signal of microprocessor transmission according to described phase shift;
(3) calculate phase difference between described quantum frequency discrimination signal and the described synchronous phase demodulation reference signal, and described phase difference is converted to voltage control signal, to adjust the output frequency of VCXO.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291136A (en) * | 2011-07-06 | 2011-12-21 | 江汉大学 | Rubidium atomic frequency standard and frequency absolute value correction circuit thereof |
| CN102751987A (en) * | 2012-07-11 | 2012-10-24 | 江汉大学 | Method and device for improving atomic frequency standard short-term stability index, and atomic frequency standard |
| CN103138756A (en) * | 2013-01-24 | 2013-06-05 | 江汉大学 | Atomic frequency standard servo method with temperature compensation and circuit |
| CN103152038A (en) * | 2013-01-31 | 2013-06-12 | 江汉大学 | Passive rubidium atomic frequency standard servo system and quantum frequency discrimination method |
| CN103326717A (en) * | 2013-05-10 | 2013-09-25 | 西安空间无线电技术研究所 | Rubidium clock scanning and capturing auxiliary locking method |
| CN104811197A (en) * | 2015-03-30 | 2015-07-29 | 江汉大学 | Synchronous phase discrimination method and atomic frequency standard |
| CN113075453A (en) * | 2021-03-30 | 2021-07-06 | 北京跟踪与通信技术研究所 | Frequency scale comparison device and method |
| CN113341679A (en) * | 2021-06-15 | 2021-09-03 | 郑州轻大产业技术研究院有限公司 | High-precision signal frequency control method and system based on Beidou space rubidium atomic clock |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291136A (en) * | 2011-07-06 | 2011-12-21 | 江汉大学 | Rubidium atomic frequency standard and frequency absolute value correction circuit thereof |
| CN102751987A (en) * | 2012-07-11 | 2012-10-24 | 江汉大学 | Method and device for improving atomic frequency standard short-term stability index, and atomic frequency standard |
| CN102751987B (en) * | 2012-07-11 | 2014-12-10 | 江汉大学 | Method and device for improving atomic frequency standard short-term stability index, and atomic frequency standard |
| CN103138756A (en) * | 2013-01-24 | 2013-06-05 | 江汉大学 | Atomic frequency standard servo method with temperature compensation and circuit |
| CN103138756B (en) * | 2013-01-24 | 2016-01-20 | 江汉大学 | A kind of atomic frequency standard servo method with temperature-compensating and circuit |
| 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 |
| CN103326717A (en) * | 2013-05-10 | 2013-09-25 | 西安空间无线电技术研究所 | Rubidium clock scanning and capturing auxiliary locking method |
| CN103326717B (en) * | 2013-05-10 | 2016-02-10 | 西安空间无线电技术研究所 | A kind of rubidium clock scan capture secondary locking method |
| CN104811197A (en) * | 2015-03-30 | 2015-07-29 | 江汉大学 | Synchronous phase discrimination method and atomic frequency standard |
| CN113075453A (en) * | 2021-03-30 | 2021-07-06 | 北京跟踪与通信技术研究所 | Frequency scale comparison device and method |
| CN113341679A (en) * | 2021-06-15 | 2021-09-03 | 郑州轻大产业技术研究院有限公司 | High-precision signal frequency control method and system based on Beidou space rubidium atomic clock |
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Application publication date: 20110427 |