CN102006068A - Improved rubidium atom frequency scale - Google Patents
Improved rubidium atom frequency scale Download PDFInfo
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- CN102006068A CN102006068A CN 201010564768 CN201010564768A CN102006068A CN 102006068 A CN102006068 A CN 102006068A CN 201010564768 CN201010564768 CN 201010564768 CN 201010564768 A CN201010564768 A CN 201010564768A CN 102006068 A CN102006068 A CN 102006068A
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Abstract
The invention discloses an improved rubidium atom frequency scale, which comprises a voltage controlled crystal oscillating module, an isolation amplifying module, a microprocessor, a digital frequency synthesis module, a radio frequency multiplication module, a physical system module, a first synchronous phase discrimination module and a temperature compensating module. The isolation amplifying module is used for isolating and amplifying output frequencies of the voltage controlled crystal oscillating module; the microprocessor is used for generating a frequency synthetic instruction, a key-controlled frequency modulation signal and a synchronous phase discrimination reference signal; the digital frequency synthesis module is used for generating a comprehensive modulation signal according to the frequency synthetic instruction and the key-controlled frequency modulation signal generated by the microprocessor; the radio frequency multiplication module is used for generating a microwave polling signal; the physical system module is used for carrying out frequency discrimination on the microwave polling signal and generating a quantum frequency discrimination signal; the first synchronous phase discrimination module is used for carrying out phase discrimination on the quantum frequency discrimination signal and generating a first voltage control signal and the temperature compensating module is used for measuring surrounding temperature of the voltage controlled crystal oscillating module and generating a second voltage control signal according to the temperature. The invention can compensate the influence on the output frequencies of the voltage controlled crystal oscillating module due to the temperature so as to improve the stability of the output frequency of the rubidium atom frequency scale.
Description
Technical field
The present invention relates to the inactive type rubidium atom frequency scale field, relate in particular to a kind of modified model 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 voltage-controlled crystal (oscillator) oscillation module, physical system module and electronic circuit.The physical system module 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 comprises that the microprocessor that is used to produce frequency synthesis instruction, keying FM signal, synchronous phase demodulation reference signal, the frequency synthesis instruction that is used for producing according to microprocessor produce the numerical frequency synthesis module of comprehensive modulation signal and the synchronous phase demodulation module that is used to carry out synchronous phase demodulation.Radio frequency frequency multiplication module comprise that the output frequency that is used for the voltage-controlled crystal (oscillator) oscillation module 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 numerical frequency synthesis module through the voltage-controlled crystal (oscillator) oscillation module after the described radio frequency frequency multiplication unit frequency multiplication produce is carried out frequency multiplication and mixing doubly, the mixing unit.
During work, radio frequency frequency multiplication unit with the output frequency frequency multiplication of voltage-controlled crystal (oscillator) oscillation module near the rubidium atomic transition frequency, microwave doubly, mixing unit comprehensive modulation signal that the numerical frequency synthesis module is produced and the output frequency of the voltage-controlled crystal (oscillator) oscillation module after the frequency multiplication carry out producing the microwave interrogation signals after frequency multiplication and the mixing simultaneously, and the microwave interrogation signals is coupled into the transition of removing to inquire after the rubidium atom in the described microwave cavity through coupling loop.Simultaneously, be stored in rubidium atom in the integrated filtering resonance bubble by the spectroscopic lamp irradiation after, the particle counter-rotating takes place between two hyperfine energy levels of rubidium atomic ground state.When the difference on the frequency of the frequency of microwave interrogation signals and two hyperfine energy levels was identical, atomic transition then promptly took place from last energy level transition to energy level down in the rubidium atom.When atomic transition takes place, photocell will detect the variation of light intensity signal, be quantum frequency discrimination signal and produce light inspection signal.Synchronously phase demodulation module synchronous phase demodulation reference signal that quantum frequency discrimination signal and microprocessor are produced is carried out synchronous phase demodulation and is obtained voltage control signal and remove to lock the voltage-controlled crystal (oscillator) oscillation module, make the output frequency of voltage-controlled crystal (oscillator) oscillation module identical, thereby obtain standard frequency output with the general line frequency of rubidium atomic transition.
Yet, because it is that performance index according to the voltage-controlled crystal (oscillator) oscillation module design that the voltage-controlled crystal (oscillator) oscillation module is easy to be subjected to influence of temperature variation and electronic circuit, thereby, when temperature changes, can cause the output frequency of voltage-controlled crystal (oscillator) oscillation module to change on a large scale, thereby cause electronic circuit the output frequency of voltage-controlled crystal (oscillator) oscillation module can't be locked on the general line frequency of rubidium atomic transition.
Therefore, be necessary to provide a kind of modified model Rb atom frequency marking to overcome above-mentioned defective.
Summary of the invention
The purpose of this invention is to provide a kind of modified model Rb atom frequency marking, can compensate the influence of Yin Wendu, thereby improve the stability of Rb atom frequency marking output frequency the output frequency of voltage-controlled crystal (oscillator) oscillation module.
To achieve these goals, the invention provides a kind of modified model Rb atom frequency marking, comprise the voltage-controlled crystal (oscillator) oscillation module; Isolation Amplifier Module is used for the output frequency of described voltage-controlled crystal (oscillator) oscillation module is isolated and amplified; Microprocessor is used to produce frequency synthesis instruction, keying FM signal and synchronous phase demodulation reference signal; The numerical frequency synthesis module is used for producing comprehensive modulation signal according to frequency synthesis instruction and keying FM signal that microprocessor produces; Radio frequency frequency multiplication module is used for carrying out frequency multiplication and mixing simultaneously and produce the microwave interrogation signals through the output frequency of the described voltage-controlled crystal (oscillator) oscillation module after described Isolation Amplifier Module isolation and the amplification and the described comprehensive modulation signal that described numerical frequency synthesis module produces; The physical system module is used for described microwave interrogation signals is carried out frequency discrimination and produces quantum frequency discrimination signal; The first synchronous phase demodulation module is used for the described quantum frequency discrimination signal that described physical system module produces is carried out phase demodulation, produces and send first voltage control signal, to adjust the output frequency of described voltage-controlled crystal (oscillator) oscillation module; And temperature compensation module, be used to measure the environment temperature of described voltage-controlled crystal (oscillator) oscillation module, and produce and send second voltage control signal, to adjust the output frequency of described voltage-controlled crystal (oscillator) oscillation module according to described temperature.
Preferably, described temperature compensation module comprises: temperature measurement unit is used to measure described voltage-controlled crystal (oscillator) oscillation module temperature on every side, and produces voltage differential signal according to the described temperature of measuring; The voltage follow unit is used to transmit described voltage differential signal and is used for matched impedance; Amplifying unit is used for the described voltage differential signal that described voltage follow unit transmits is amplified; The gain linearity regulon is used for that the described voltage differential signal after amplifying through described amplifying unit is carried out gain linearity and regulates.
Preferably, described modified model Rb atom frequency marking also comprises global positioning system correction module, the frequency signal that is used for the receiving world locational system antenna transmission, and according to described frequency signal generation that receives and transmission tertiary voltage control signal, to adjust the output frequency of described voltage-controlled crystal (oscillator) oscillation module.
Preferably, described global positioning system correction module comprises: receiving element is used for the frequency signal of receiving world locational system antenna transmission; The synthetic frequency unit of numeral is used for the output frequency through the described voltage-controlled crystal (oscillator) oscillation module after described Isolation Amplifier Module isolation and the amplification is carried out frequency division; The second synchronous phase demodulation unit, the described frequency signal that is used for receiving according to described receiving element carries out phase demodulation to the output frequency through the described voltage-controlled crystal (oscillator) oscillation module behind the synthetic frequency unit frequency division of described numeral, produces the dc pulse voltage signal; And the loop filtering unit, be used for that described dc pulse voltage signal is carried out filtering and obtain the 3rd control voltage control signal, and send the output frequency that described tertiary voltage control signal removes to adjust described voltage-controlled crystal (oscillator) oscillation module.Employing is carried out phase demodulation and is produced the output frequency that deviation correcting signal removes to correct described voltage-controlled crystal (oscillator) oscillation module from the stable frequency signal of global positioning system antenna transmission and the output frequency of described voltage-controlled crystal (oscillator) oscillation module, the output frequency that makes described voltage-controlled crystal (oscillator) oscillation module is more near rubidium atomic transition spectral line frequency, thus the stability of raising Rb atom frequency marking output frequency.
Preferably, described modified model Rb atom frequency marking also comprises: the frequency-selecting amplification module is used for carrying out frequency-selecting and amplification before the output frequency of described voltage-controlled crystal (oscillator) oscillation module being isolated and amplify.
Preferably, described receiving element is a GPS receiver.
Preferably, described crystal oscillation module comprises quartz crystal unit, the thermistor that is connected with described quartz crystal unit and first variable capacitance diode that is connected with described quartz crystal unit respectively, second variable capacitance diode, the 3rd variable capacitance diode, described first voltage control signal acts on described quartz crystal unit through described first variable capacitance diode, described second voltage control signal acts on described quartz crystal unit through described second variable capacitance diode, and described tertiary voltage control signal acts on described quartz crystal unit through described the 3rd variable capacitance diode.
Compared with prior art, the present invention produces a temperature-compensated voltage difference by temperature compensation module and acts on the voltage-controlled crystal (oscillator) oscillation module, with the influence of compensation Yin Wendu to the generation of voltage-controlled crystal (oscillator) oscillation module, thereby adjust the output frequency of voltage-controlled crystal (oscillator) oscillation module, make the output frequency of voltage-controlled crystal (oscillator) oscillation module more stable.
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 modified model Rb atom frequency marking of the present invention.
Fig. 2 is the structured flowchart of the radio frequency frequency multiplication module of modified model Rb atom frequency marking of the present invention.
Fig. 3 is the structural representation of the physical system module of modified model Rb atom frequency marking of the present invention.
Fig. 4 is the structural representation of the temperature compensation module of modified model Rb atom frequency marking of the present invention.
Fig. 5 is the structured flowchart of the global positioning system correction module of modified model Rb atom frequency marking of the present invention.
Fig. 6 is the structured flowchart of the crystal oscillation module of modified model Rb atom frequency marking of the present invention.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, the similar elements label is represented similar elements in the accompanying drawing.
As Fig. 1-2, present embodiment modified model Rb atom frequency marking comprises: voltage-controlled crystal (oscillator) oscillation module 10, frequency-selecting amplification module 11, Isolation Amplifier Module 12, microprocessor 13, numerical frequency synthesis module 14, radio frequency frequency multiplication module 15, physical system module 16, the first synchronous phase demodulation module 17, temperature compensation module 18, global positioning system correction module 19 and global positioning system antenna 20.Wherein, described radio frequency frequency multiplication module 15 comprise radio frequency frequency multiplication unit 151 and microwave microwave doubly, mixing unit 152.
Described frequency-selecting amplification module 11 is used for carrying out frequency-selecting and amplification before the output frequency of described voltage-controlled crystal (oscillator) oscillation module 10 being isolated and amplify.Described Isolation Amplifier Module 12 is used for isolating through the output frequency of the described voltage-controlled crystal (oscillator) oscillation module 10 after described frequency-selecting amplification module 11 frequency-selectings and the amplification and amplifying; Described microprocessor 13 is used to produce frequency synthesis instruction, keying FM signal and synchronous phase demodulation reference signal; Described numerical frequency synthesis module 14 is used for producing comprehensive modulation signal according to frequency synthesis instruction and keying FM signal that described microprocessor 13 produces; Described radio frequency frequency multiplication unit 151 is used for the output frequency through the described voltage-controlled crystal (oscillator) oscillation module 10 after described Isolation Amplifier Module 12 isolation and the amplification is carried out frequency multiplication; Described microwave doubly, mixing unit 152 is used for that the described radio frequency frequency multiplication of process unit 151 is carried out the output frequency of frequency multiplication described voltage-controlled crystal (oscillator) oscillation module 10 afterwards and the described comprehensive modulation signal of described digital synthesis module 13 generations carries out frequency multiplication and mixing simultaneously and produces the microwave interrogation signals; Described physical system module 16 is used for described microwave interrogation signals is carried out frequency discrimination and produces quantum frequency discrimination signal; The described first synchronous phase demodulation module 17 is used for the described quantum frequency discrimination signal that described physical system module 16 produces is carried out phase demodulation, produces and send the first voltage control signal U1, to adjust the output frequency of described voltage-controlled crystal (oscillator) oscillation module 10; Described temperature compensation module 18 is used to measure the environment temperature of described voltage-controlled crystal (oscillator) oscillation module 10, and produces and send the second voltage control signal U2 according to described temperature, to adjust the output frequency of described voltage-controlled crystal (oscillator) oscillation module 10; Global positioning system correction module 19 is used to receive the frequency signal that described global positioning system antenna 20 sends, and according to described frequency signal generation that receives and transmission tertiary voltage control signal U3, to adjust the output frequency of described voltage-controlled crystal (oscillator) oscillation module 10.
Understandably, the described first voltage control signal U1, the described second voltage control signal U2 and described tertiary voltage control signal U3 all will be through after the digital-to-analogue conversions of described little processing 13, act on described voltage-controlled crystal (oscillator) oscillation module 10 again, to adjust the output frequency f of described voltage-controlled crystal (oscillator) oscillation module 10.
Particularly, as shown in Figure 3, described physical system module 16 comprises the spectroscopic lamp 161 that produces pumping light, the integrated filtering resonance bubble 162 of storage rubidium atom, the microwave cavity 163 of storage microwave field, generation is parallel to the C field coil 164 of the magnetostatic field of described microwave cavity axis, sensed light signal is the photocell 165 of quantum frequency discrimination signal, microwave is coupled into the coupling loop 166 of described microwave cavity, prevent the magnetic cup 167 that magnetostatic field penetrates, make described spectroscopic lamp 161 and described microwave cavity 163 keep the described temperature control modules 168 of temperature constant state and the constant-current source 169 that electric current is provided for described C field coil 164.
As shown in Figure 4, be the structural representation of described temperature compensation module 18.Described temperature compensation module 18 comprises: temperature measurement unit 181, voltage follow unit 182, amplifying unit 183 and gain linearity regulon 184.Described temperature measurement unit 181 is used to measure described voltage-controlled crystal (oscillator) oscillation module 10 temperature on every side, and produces voltage differential signal according to the described temperature of measuring.Described temperature measurement unit 181 specifically comprises the identical resistance R of two resistances connecting by the bridge circuit mode, pre-set the thermistor (temperature) sensor R0 of temperature value, be used for the first thermistor Rk of thermometric.Described voltage follow unit 182 is used to transmit described voltage differential signal and is used for matched impedance.Described voltage follow unit 182 specifically comprises two voltage follower A1 and A2.Described amplifying unit 183 is used for the described voltage differential signal that described voltage follow unit 182 transmits is amplified.Particularly, described amplifying unit 183 is differential amplifier A3.Described gain linearity regulon 184 is used for that the described voltage differential signal after amplifying through described amplifying unit 183 is carried out gain linearity to be regulated.Particularly, described gain linearity regulon 184 is gain linearity adjuster A4.During work, when the measured value of the described first thermistor Rk equates with the preset value of described thermistor (temperature) sensor R0 when the operating ambient temperature of described voltage-controlled crystal (oscillator) oscillation module 10 is constant, the output voltage difference at resistance bridge A, B two ends is zero, the output end voltage of described temperature compensation module 18 is zero, and the promptly described second voltage control signal U2 is zero.When the operating ambient temperature of described voltage-controlled crystal (oscillator) oscillation module 10 changes, resistance bridge A, the B two ends form certain voltage difference, described voltage difference is transmitted to described differential amplifier A3 through two described voltage follower A1 and A2 successively and amplifies, in order effectively to gather described voltage difference, described voltage difference is carried out the gain linearity adjusting through being transmitted to described gain linearity adjuster A4 behind the described differential amplifier A3, at last, the described voltage difference after described gain linearity adjuster A4 will regulate is that the described second voltage control signal U2 exports to described voltage-controlled crystal (oscillator) oscillation module 10.
As shown in Figure 5, be the structural representation of described global positioning system correction module 19.Described global positioning system correction module 19 comprises receiving element 191, synthetic frequency unit 192, second synchronous phase demodulation unit 193 and the loop filtering unit 194 of numeral.Described receiving element 1911 is used to receive the frequency signal that described global positioning system antenna 20 sends; The synthetic frequency unit 192 of described numeral is used for the output frequency through the described voltage-controlled crystal (oscillator) oscillation module after described Isolation Amplifier Module 13 isolation and the amplification is carried out frequency division; The described frequency signal that the described second synchronous phase demodulation unit 193 is used for receiving according to described receiving element 191 carries out phase demodulation to the output frequency through the described voltage-controlled crystal (oscillator) oscillation module 10 behind synthetic frequency unit 192 frequency divisions of described numeral, produces the dc pulse voltage signal; Described loop filtering unit 194 is used for that described dc pulse voltage signal is carried out filtering and obtains the 3rd control voltage control signal U3, and sends described tertiary voltage control signal U3, to adjust the output frequency of described voltage-controlled crystal (oscillator) oscillation module 10.Particularly, described receiving element 191 is a GPS receiver.
As shown in Figure 6, be the structural representation of described voltage-controlled crystal (oscillator) oscillation module 10.Described crystal oscillation module 10 comprises quartz crystal unit 111, the thermistor 112 that is connected with described quartz crystal unit 111 and first variable capacitance diode 113, second variable capacitance diode 114, the 3rd variable capacitance diode 115 that are connected with described quartz crystal unit 111 respectively.The described first voltage control signal U1 acts on described quartz crystal unit 111 through described first variable capacitance diode 113, the described second voltage control signal U2 acts on described quartz crystal unit 111 through described second variable capacitance diode 114, and described tertiary voltage control signal U3 acts on described quartz crystal unit 111 through described the 3rd variable capacitance diode 115.Understandably, when the ambient temperature of described voltage-controlled crystal (oscillator) oscillation module 10 changes, the capacitance respective change of the resistance of described second thermistor 112, described first variable capacitance diode 113, described second variable capacitance diode 114 and described the 3rd variable capacitance diode 115, thereby the temperature drift of offsetting or subduing the output frequency of described quartz crystal unit 111.In addition, by the described first voltage control signal U1, described second voltage control signal U2 and described tertiary voltage control signal U3 act on described first variable capacitance diode 113 respectively, described second variable capacitance diode 114 and described the 3rd variable capacitance diode 115, and make described first variable capacitance diode 113, the capacitance of described second variable capacitance diode 114 and described the 3rd variable capacitance diode 115 changes, thereby divide three tunnel non-linear frequency drifts to compensate to described quartz crystal unit 111, and then make the output frequency f of described quartz crystal unit 111 aim at the general line frequency of rubidium atomic transition, export stable 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 (7)
1. modified model Rb atom frequency marking comprises:
The voltage-controlled crystal (oscillator) oscillation module;
Isolation Amplifier Module is used for the output frequency of described voltage-controlled crystal (oscillator) oscillation module is isolated and amplified;
Microprocessor is used to produce frequency synthesis instruction, keying FM signal and synchronous phase demodulation reference signal;
The numerical frequency synthesis module is used for producing comprehensive modulation signal according to frequency synthesis instruction and keying FM signal that described microprocessor produces;
Radio frequency frequency multiplication module is used for carrying out frequency multiplication and mixing simultaneously and produce the microwave interrogation signals through the output frequency of the described voltage-controlled crystal (oscillator) oscillation module after described Isolation Amplifier Module isolation and the amplification and the described comprehensive modulation signal that described numerical frequency synthesis module produces;
The physical system module is used for described microwave interrogation signals is carried out frequency discrimination and produces quantum frequency discrimination signal;
The first synchronous phase demodulation module is used for the described quantum frequency discrimination signal that described physical system module produces is carried out phase demodulation, produces and send first voltage control signal, to adjust the output frequency of described voltage-controlled crystal (oscillator) oscillation module;
It is characterized in that, also comprise:
Temperature compensation module is used to measure the environment temperature of described voltage-controlled crystal (oscillator) oscillation module, and produces and send second voltage control signal according to described temperature, to adjust the output frequency of described voltage-controlled crystal (oscillator) oscillation module.
2. modified model Rb atom frequency marking as claimed in claim 1 is characterized in that, described temperature compensation module comprises:
Temperature measurement unit is used to measure described voltage-controlled crystal (oscillator) oscillation module temperature on every side, and produces voltage differential signal according to the described temperature of measuring;
The voltage follow unit is used to transmit described voltage differential signal and is used for matched impedance;
Amplifying unit is used for the described voltage differential signal that described voltage follow unit transmits is amplified;
The gain linearity regulon is used for that the described voltage differential signal after amplifying through described amplifying unit is carried out the gain linearity adjusting and obtains second voltage control signal, to adjust the output frequency of described voltage-controlled crystal (oscillator) oscillation module.
3. modified model Rb atom frequency marking as claimed in claim 1 is characterized in that, also comprises:
Global positioning system correction module is used for the frequency signal of receiving world locational system antenna transmission, and produces and send the tertiary voltage control signal according to the described frequency signal that receives, to adjust the output frequency of described voltage-controlled crystal (oscillator) oscillation module.
4. modified model Rb atom frequency marking as claimed in claim 3 is characterized in that, described global positioning system correction module comprises:
Receiving element is used for the frequency signal of receiving world locational system antenna transmission;
The synthetic frequency unit of numeral is used for the output frequency through the described voltage-controlled crystal (oscillator) oscillation module after described Isolation Amplifier Module isolation and the amplification is carried out frequency division;
The second synchronous phase demodulation unit, the described frequency signal that is used for receiving according to described receiving element carries out phase demodulation to the output frequency through the described voltage-controlled crystal (oscillator) oscillation module behind the synthetic frequency unit frequency division of described numeral, produces the dc pulse voltage signal;
The loop filtering unit is used for that described dc pulse voltage signal is carried out filtering and obtains the 3rd control voltage control signal, and send described tertiary voltage control signal, to adjust the output frequency of described voltage-controlled crystal (oscillator) oscillation module.
5. modified model Rb atom frequency marking as claimed in claim 4 is characterized in that, described receiving element is a GPS receiver.
6. modified model Rb atom frequency marking as claimed in claim 1 is characterized in that, also comprises: the frequency-selecting amplification module is used for carrying out frequency-selecting and amplification before the output frequency of described voltage-controlled crystal (oscillator) oscillation module being isolated and amplify.
7. modified model Rb atom frequency marking as claimed in claim 1, it is characterized in that, described crystal oscillation module comprises quartz crystal unit, thermistor that is connected with described quartz crystal unit and first variable capacitance diode that is connected with described quartz crystal unit respectively, second variable capacitance diode, the 3rd variable capacitance diode, described first voltage control signal acts on described quartz crystal unit through described first variable capacitance diode, described second voltage control signal acts on described quartz crystal unit through described second variable capacitance diode, and described tertiary voltage control signal acts on described quartz crystal unit through described the 3rd variable capacitance diode.
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| CN104811197A (en) * | 2015-03-30 | 2015-07-29 | 江汉大学 | Synchronous phase discrimination method and atomic frequency standard |
| CN105743498A (en) * | 2016-02-01 | 2016-07-06 | 江汉大学 | Time reference system and apparatus, and method and device for time reference |
| CN109474272A (en) * | 2017-09-07 | 2019-03-15 | 江汉大学 | A kind of temporal frequency signal source with synchronization signal output |
| CN107479358A (en) * | 2017-09-25 | 2017-12-15 | 江汉大学 | A kind of signal generator unit |
| CN114779604A (en) * | 2022-04-12 | 2022-07-22 | 中国科学院精密测量科学与技术创新研究院 | Rubidium atomic clock drift control device and method |
| CN114779604B (en) * | 2022-04-12 | 2023-06-30 | 中国科学院精密测量科学与技术创新研究院 | Rubidium atomic clock drift control device and method |
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Application publication date: 20110406 |