CN202758005U - SNR measuring device used for atomic clock - Google Patents
SNR measuring device used for atomic clock Download PDFInfo
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- CN202758005U CN202758005U CN 201220351216 CN201220351216U CN202758005U CN 202758005 U CN202758005 U CN 202758005U CN 201220351216 CN201220351216 CN 201220351216 CN 201220351216 U CN201220351216 U CN 201220351216U CN 202758005 U CN202758005 U CN 202758005U
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Abstract
The utility model discloses an SNR (Signal to Noise Ratio) measuring device used for an atomic clock and belongs to the field of atomic frequency standard. The SNR measuring device used for the atomic clock includes a first module sampling unit used for collecting frequency discrimination signals output by a physical system under the effect of microwave inquiring signals that are not modulated; a second module sampling unit used for collecting voltage control signals that are obtained through realizing servo loop phase locking of frequency discrimination signals output by the physical system under the effect of microwave inquiring signals that are modulated; signals used for outputting first sweep frequency voltage and second sweep frequency voltage to a voltage control crystal oscillator to change output frequency of the voltage control crystal oscillator; and a master control unit calculating the SNR of the atomic clock according to the correspondence relation of the frequency discrimination signals and voltage points of the first sweep frequency voltage and the correspondence relation of the voltage control signals and voltage points of the second sweep frequency voltage. By adopting the utility model, the measurement accuracy of the SNR of the atomic clock is improved.
Description
Technical field
The utility model relates to the atomic frequency standard field, particularly a kind of atomic clock signal-to-noise ratio measurement apparatus.
Background technology
Along with the development of science and technology, people are more and more to the demand of standard clock source.Because simple in structure, the little and low cost and other advantages of volume power consumption, atomic clock is widely used in the clock source field.
Wherein, the signal to noise ratio (S/N ratio) of atomic clock is the important performance index of atomic clock, has determined the stability of atomic clock output frequency.In order to improve the stability of atomic clock output frequency, need the signal to noise ratio (S/N ratio) of atomic clock is assessed.Existing signal to noise ratio (S/N ratio) appraisal procedure is, at the external sweep generator of atomic clock system, registering instrument and data processing equipment.Particularly, operation atomic clock complete machine, and the output frequency of change sweep generator; Then the quantum correction voltage of exporting by registering instrument synchronous recording servo loop; At last output frequency and the quantum of sweep generator are rectified a deviation store voltages to data processing equipment, data processing equipment obtains the frequency discrimination curve of atomic clock according to the one-to-one relationship of output frequency and quantum correction voltage; And go out the signal to noise ratio (S/N ratio) of atomic clock according to the coordinate Calculation of frequency discrimination curve respective point.
In realizing process of the present utility model, the inventor finds that there is following problem at least in prior art:
Measure the signal to noise ratio (S/N ratio) of atomic clock by external sweep generator, registering instrument and data processing equipment, on the one hand, when measuring signal to noise ratio (S/N ratio) above-mentioned instrument need to be installed, so that measurement procedure is too complicated; Simultaneously, each functional module of existing atomic clock integrates often, and other comparison in equipment difficulties additionally are installed, and needs the redesign circuit; On the other hand, prior art is only counted signal to noise ratio (S/N ratio) according to quantum correction voltage, and wherein one of desired parameters absorption factor is a discreet value in the signal to noise ratio (S/N ratio) formula, causes the signal to noise ratio (S/N ratio) of the atomic clock that calculates not accurate enough.
The utility model content
The flow process of assessing in order to simplify signal to noise ratio (S/N ratio), and the accuracy of the signal to noise ratio (S/N ratio) assessment of raising atomic clock, the utility model embodiment provides a kind of atomic clock signal-to-noise ratio measurement apparatus.Described technical scheme is as follows:
A kind of atomic clock signal-to-noise ratio measurement apparatus, described atomic clock comprise VCXO, synthesizer, servo loop, microwave times mixting circuit and physical system, and described device comprises:
Be used for gathering described physical system at the first modulus sampling unit of the frequency discrimination signal of exporting under the microwave interrogation signals effect of non-modulated, be used for gathering the second modulus sampling unit of the voltage-controlled signal of frequency discrimination signal after described servo loop is phase-locked that described physical system exports under the microwave interrogation signals effect after the modulation and be used for output the first sweep voltage and the second sweep voltage to described VCXO, so that the signal that described VCXO output frequency changes; And according to the corresponding relation of the electrical voltage point of the corresponding relation of the electrical voltage point of described frequency discrimination signal and described the first sweep voltage and described voltage-controlled signal and described the second sweep voltage, calculate the main control unit of the signal to noise ratio (S/N ratio) of described atomic clock; The microwave interrogation signals of described non-modulated is the signal of the output signal of described VCXO and simple signal generation after described microwave times mixting circuit is processed that described synthesizer is exported; Microwave interrogation signals after the described modulation is the signal of the output signal of described VCXO and keying FM signal generation after described microwave times mixting circuit is processed that described synthesizer is exported.
Particularly, described main control unit is the microprocessor in the described atomic clock.
The beneficial effect that the technical scheme that the utility model embodiment provides is brought is: by the first modulus sampling unit, be used for gathering the frequency discrimination signal that described physical system is exported under the microwave interrogation signals effect of non-modulated; The second modulus sampling unit is used for gathering the voltage-controlled signal of frequency discrimination signal after described servo loop is phase-locked that described physical system is exported under the microwave interrogation signals effect after the modulation; Main control unit is used for output the first sweep voltage and the second sweep voltage to described VCXO, so that the signal that described VCXO output frequency changes; And according to the corresponding relation of the electrical voltage point of the corresponding relation of the electrical voltage point of described frequency discrimination signal and described the first sweep voltage and described voltage-controlled signal and described the second sweep voltage, calculate the signal to noise ratio (S/N ratio) of described atomic clock; So that utilize the original electronic circuit of atomic clock to finish the assessment of signal to noise ratio (S/N ratio), simplified the signal to noise ratio (S/N ratio) estimation flow, saved resource; And, utilize respectively the corresponding relation of the electrical voltage point of the corresponding relation of electrical voltage point of described frequency discrimination signal and described the first sweep voltage and described voltage-controlled signal and described the second sweep voltage to calculate signal to noise ratio (S/N ratio), improved the accuracy of the signal to noise ratio (S/N ratio) of atomic clock.
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 was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the atomic clock that provides among the utility model embodiment;
Fig. 2 is the structural representation of a kind of atomic clock signal-to-noise ratio measurement apparatus of providing among the utility model embodiment 1;
Fig. 3 is the structural representation of a kind of atomic clock signal-to-noise ratio measurement apparatus of providing among the utility model embodiment 2;
Fig. 4 is the structural representation of the physical system of the atomic clock that provides among the utility model embodiment 2;
Fig. 5 is the synoptic diagram of the absorption curve of the drafting that provides among the utility model embodiment 2;
Fig. 6 is the synoptic diagram of the frequency discrimination curve of the drafting that provides among the utility model embodiment 2.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model embodiment is described in further detail.
Understanding for ease of to apparatus and method described in the utility model embodiment at first is introduced the formation of atomic clock.Referring to Fig. 1, atomic clock comprises VCXO 1, isolated amplifier 6, synthesizer 2, servo loop 3, microwave times mixing 4, physical system 5.The output signal of VCXO 1 obtains a microwave interrogation signals again through the combined action of synthesizer 2 after microwave times mixing 4 frequency multiplication mixing.5 pairs of microwave interrogation signals of physical system carry out frequency discrimination, obtain the frequency discrimination signal by photoelectric cell in the physical system 5.The frequency discrimination signal obtains VCXO 1 is carried out voltage-controlled correction voltage after the phase-locked processing of servo loop 3, thereby VCXO 1 output frequency is locked onto on the peak dot of atomic resonance Absorption Line.Based on this, a kind of atomic clock signal-to-noise ratio measurement apparatus is provided among the utility model embodiment, be described below.
Embodiment 1
Referring to Fig. 2, the utility model embodiment 1 provides a kind of atomic clock signal-to-noise ratio measurement apparatus, and this device specifically comprises: the first modulus sampling unit 101, the second modulus sampling unit 102 and main control unit 103.
Wherein, the first modulus sampling unit 101 is used for gathering the frequency discrimination signal that physical system 5 is exported under the microwave interrogation signals effect of non-modulated.
Wherein, the second modulus sampling unit 102 be used for to gather physical system 5 at the voltage-controlled signal of the frequency discrimination signal of exporting under the microwave interrogation signals effect after the modulation after servo loop 3 is phase-locked.
Wherein, main control unit 103 is used for output the first sweep voltage and the second sweep voltage to VCXO 1, so that the frequency of VCXO 1 exporting change; And according to the corresponding relation of the electrical voltage point of the corresponding relation of the electrical voltage point of frequency discrimination signal and the first sweep voltage and voltage-controlled signal and the second sweep voltage, calculate the signal to noise ratio (S/N ratio) of atomic clock.
Particularly, the microwave interrogation signals of this non-modulated is produced after microwave times mixting circuit 4 is processed by the output signal of VCXO 1 and the simple signal of synthesizer 2 outputs; Microwave interrogation signals after this modulation is produced after microwave times mixting circuit 4 is processed by the output signal of VCXO 1 and the keying FM signal of synthesizer 2 outputs.
The beneficial effect that the technical scheme that the utility model embodiment provides is brought is: by the first modulus sampling unit, be used for gathering the frequency discrimination signal that described physical system is exported under the microwave interrogation signals effect of non-modulated; The second modulus sampling unit is used for gathering the voltage-controlled signal of frequency discrimination signal after described servo loop is phase-locked that described physical system is exported under the microwave interrogation signals effect after the modulation; Main control unit is used for output the first sweep voltage and the second sweep voltage to described VCXO, so that the signal that described VCXO output frequency changes; And according to the corresponding relation of the electrical voltage point of the corresponding relation of the electrical voltage point of described frequency discrimination signal and described the first sweep voltage and described voltage-controlled signal and described the second sweep voltage, calculate the signal to noise ratio (S/N ratio) of described atomic clock; So that utilize the original electronic circuit of atomic clock to finish the assessment of signal to noise ratio (S/N ratio), simplified the signal to noise ratio (S/N ratio) estimation flow, saved resource; And, utilize respectively the corresponding relation of the electrical voltage point of the corresponding relation of electrical voltage point of described frequency discrimination signal and described the first sweep voltage and described voltage-controlled signal and described the second sweep voltage to calculate signal to noise ratio (S/N ratio), improved the accuracy of the signal to noise ratio (S/N ratio) of atomic clock.
Referring to Fig. 3, the utility model embodiment 2 provides a kind of atomic clock signal-to-noise ratio measurement apparatus, and this device comprises the first modulus sampling unit 201, the second modulus sampling unit 202 and main control unit 203.
Wherein, the first modulus sampling unit 201 is connected with main control unit with physical system 5 respectively and is connected, and is used for gathering the frequency discrimination signal that physical system 5 is exported under the microwave interrogation signals effect of non-modulated.The microwave interrogation signals of this non-modulated is produced after microwave times mixting circuit 4 is processed by the output signal of VCXO 1 and the simple signal of synthesizer 2 outputs.
Wherein, the second modulus sampling unit 202 is connected with main control unit with servo loop 3 respectively and is connected, and is used for gathering physical system 5 at the voltage-controlled signal of the frequency discrimination signal of exporting under the microwave interrogation signals effect after the modulation after servo loop 3 is phase-locked.Microwave interrogation signals after this modulation is produced after microwave times mixting circuit 4 is processed by the output signal of VCXO 1 and the keying FM signal of synthesizer 2 outputs.
Wherein, main control unit 203 is connected with servo loop with the first modulus sampling unit 201, the second modulus sampling unit 202, VCXO 1, synthesizer 3 respectively and is connected, and is used for output the first sweep voltage and the second sweep voltage to VCXO 1; So that the frequency of VCXO 1 exporting change; And according to the corresponding relation of the electrical voltage point of the corresponding relation of the electrical voltage point of frequency discrimination signal and the first sweep voltage and voltage-controlled signal and the second sweep voltage, calculate the signal to noise ratio (S/N ratio) of atomic clock.Particularly, main control unit 203 can adopt the microprocessor in the atomic clock.
Usually, referring to Fig. 4, physical system 5 comprises spectrum lamp 5a, lens 5b, integrated filtering resonator system 5c and photoelectric detective circuit.Photoelectric detective circuit comprises photoelectric cell 5d, input circuit 5e and prime amplifier 5f.Enter into integrated filtering resonator system 5c behind the pumping light process lens 5b of spectrum lamp 5a emission and finish the quantum frequency discrimination, on signal feedback to two behind the frequency discrimination photoelectric cell 5d, photoelectric cell 5d is undertaken electric signal being delivered to prime amplifier 5f after the opto-electronic conversion by input circuit 5e again.Wherein, be filled with rubidium element and starter gas among the spectrum lamp 5a, be filled with rubidium isotope and inert gas among the integrated filtering resonator system 5c.In addition, the thick direction of arrow represents magnetic field and microwave interrogation signals input direction among Fig. 4; Adding magnetic field is for former quantum splitting and " quantization axle "; Adding the microwave interrogation signals is for resonant transition.Particularly, the first modulus sampling unit 201 respectively with physical system 5 in prime amplifier 5f are connected with main control unit and are connected.
Further, main control unit 203 also is used for, output FSK(Frequency-Shift Keying, frequency shift keying) signal is to synthesizer 2, control synthesizer 2 produces to be modulated the microwave interrogation signals with the modulation frequency signal of keying frequency modulation, with the microwave interrogation signals after obtaining modulating; And control synthesizer 2 produces simple signal to microwave times mixing 4, to obtain the microwave interrogation signals of non-modulated.
Further, main control unit 203 also is used for, output and fsk signal with frequently and the synchronizing signal that fixed skew is arranged to servo loop 3, it is phase-locked that 3 pairs of frequency discrimination signals of servo loop are carried out, and obtains voltage-controlled signal.
Particularly, the course of work of atomic clock signal-to-noise ratio measurement apparatus comprises the drafting of the drafting of absorption curve, frequency discrimination curve and the calculating of signal to noise ratio (S/N ratio), and the below will be described respectively:
A, the drafting of absorption curve.
Wherein, main control unit 203 is by the D/A frequency sweep, and the output sweep voltage is to VCXO 1, and this sweep voltage makes the signal of VCXO 1 output frequency variation; Simultaneously, main control unit 203 is closed fsk signal and is enabled (not exporting fsk signal DDS to the synthesizer 3), makes the frequency signal of DDS output single-frequency in the synthesizer 2.The frequency signal of this single-frequency is delivered to physical system 5 through the microwave interrogation signals that microwave times mixing 4 effects produce non-modulated, and physical system 5 is finished and delivered to the first modulus sampling unit 201 after the quantum frequency discrimination amplifies by prime amplifier 5f.The first modulus sampling unit 201 is finished the collection of frequency discrimination signal, and the frequency discrimination signal is returned main control unit 203.Main control unit 203 is drawn the absorption curve of rubidium atom according to the corresponding relation of sweep voltage and frequency discrimination signal.Referring to Fig. 5, in the absorption curve of drafting, X-axis is the corresponding magnitude of voltage of the sweep voltage of main control unit 203 records; Y-axis is the current value of the frequency discrimination signal of the first modulus sampling unit 201 collections, and the two is to concern one to one.
B, the drafting of frequency discrimination curve.
Wherein, main control unit 203 is by the D/A frequency sweep, and the output sweep voltage is to VCXO 1; Simultaneously, main control unit 203 is opened fsk signal and is enabled, and output fsk signal DDS to the synthesizer 2 makes DDS output with the modulation frequency signal of keying frequency modulation.Further, main control unit 203 also export with fsk signal with frequently and the synchronizing signal that fixed skew (as: differing 40 °) is arranged to servo loop 3, make 3 pairs of frequency discrimination signals of servo loop carry out phase-locked.This modulation frequency signal microwave interrogation signals after microwave times mixing 4 effects produce modulation with keying frequency modulation is delivered to physical system 5, and physical system 5 is finished and delivered to servo loop 3 after the quantum frequency discrimination amplifies by prime amplifier 5f.Servo loop 3 is exported voltage-controlled signal to the second modulus sampling unit 202 after finishing phase-locked amplification.The second modulus sampling unit 202 is finished the collection of voltage-controlled signal, and voltage-controlled signal is returned main control unit 203.Main control unit 203 is drawn the frequency discrimination curve of rubidium atom according to the corresponding relation of sweep voltage and voltage-controlled signal.Referring to Fig. 6, in the frequency discrimination curve of drafting, X-axis is the corresponding magnitude of voltage of the sweep voltage of main control unit 203 records; Y-axis is the magnitude of voltage of the voltage-controlled signal of the second modulus sampling unit 202 collections, and the two is to concern one to one.
C, the calculating of signal to noise ratio (S/N ratio).
Wherein, after main control unit 203 is finished the drafting of absorption curve and frequency discrimination curve, according to existing computing method, the signal to noise ratio (S/N ratio) of atomic clock is calculated.
The below simply introduces the process of calculating the atomic clock signal to noise ratio (S/N ratio), and this process comprises step a～b:
Step a: export the first sweep voltage to VCXO 1, so that the signal that VCXO 1 output frequency changes; And gather the frequency discrimination signal that physical system 5 is exported under the microwave interrogation signals effect of non-modulated.
Wherein, the microwave interrogation signals of this non-modulated is produced after microwave times mixting circuit 4 is processed by the output signal of VCXO 1 and the simple signal of synthesizer 2 outputs.
Wherein, the first sweep voltage becomes one-to-one relationship with the frequency discrimination signal.
Step b: export the second sweep voltage to VCXO 1, so that the signal that VCXO 1 output frequency changes; And gather the voltage-controlled signal that physical system 5 obtains after servo loop 3 is phase-locked at the frequency discrimination signal of exporting under the microwave interrogation signals effect after the modulation.
Wherein, the microwave interrogation signals after this modulation is produced after microwave times mixting circuit 4 is processed by the output signal of VCXO 1 and the keying FM signal of synthesizer 2 outputs.
Wherein, the second sweep voltage becomes one-to-one relationship with voltage-controlled signal.
Step c: according to the corresponding relation of the electrical voltage point of the corresponding relation of the electrical voltage point of frequency discrimination signal and the first sweep voltage and voltage-controlled signal and the second sweep voltage, calculate the signal to noise ratio (S/N ratio) of atomic clock.
Further, this step specifically comprises step (1)～(4):
Step (1): according to the one-to-one relationship of frequency discrimination signal and the first sweep voltage, draw absorption curve.
Particularly, draw the detailed process of absorption curve referring to abovementioned steps A, be not described in detail in this.
Step (2): according to the one-to-one relationship of voltage-controlled signal and the second sweep voltage, draw frequency discrimination curve.
Particularly, draw the detailed process of frequency discrimination curve referring to abovementioned steps B, be not described in detail in this.
Step (3): calculate absorption factor according to absorption curve; Calculate live width according to frequency discrimination curve; Obtain default depth of modulation.
Particularly, suppose that absorption factor is α, live width is δ ν, and depth of modulation is 2 ε.At first, according to absorption curve and formula, calculate absorption factor.The formula that calculates absorption factor is as follows,
Referring to Fig. 5, I
0Maximal value for the frequency discrimination signal (light intensity current value) that gathers; Δ I is I
0And the difference between the minimum value of frequency discrimination signal.
Then, according to frequency discrimination curve and formula
Calculate live width.Referring to Fig. 6, δ ν is the difference between the second swept-frequency signal corresponding to the maximal value of the voltage-controlled signal of collection second swept-frequency signal corresponding with the minimum value of voltage-controlled signal.
At last, obtain depth of modulation 2 ε that set in advance.Usually, the size of depth of modulation should be less than the size of rubidium atom natural width.
Step (4): adopt absorption factor, live width and depth of modulation to calculate the signal to noise ratio (S/N ratio) of atomic clock.
With ε, α, Δ ν and the constant e substitution signal to noise ratio (S/N ratio) formula that calculates
Calculate signal to noise ratio (S/N ratio)
Particularly, e is electric charge, is a constant.
What deserves to be explained is, because the collection of voltage from front amplifying board output, when the design pre-amplification circuit, has certain gain and direct current background level, when calculating, need to deduct these.Simultaneously, for improving the precision of whole system signal to noise ratio (S/N ratio) assessment, need to gather as far as possible multiple spot, as corresponding to live width=800Hz and atomic frequency standard system, main control unit 203 selects D/A output voltage each time to make the frequency shift 1Hz of whole system according to the voltage-controlled slope of VCXO 1 and other auxiliary circuits.
In addition, when using the atomic clock signal-to-noise ratio measurement apparatus that atomic clock is carried out testing evaluation, also should consider the noise effect that photoelectric cell brings in the physical system 5.The first, in order to reduce the impact of the flicker noise that photoelectric cell brings, in real work, to select higher a little modulating frequency, be 87Hz as selecting modulating frequency.Second, in order to reduce the impact of Johnson noise and thermonoise, select suitable spectrum lamp light intensity, increase the sensitive surface (selecting two photoelectric cells) of transmitted light detector, and select appropriate bubble temperature (as selecting 700C), lamp temperature (as selecting 1210C).In addition, for an atomic clock, under its photoelectric cell noise certain condition, its signal to noise ratio (S/N ratio) is also closely related with depth of modulation, suitably selects the depth of modulation (as selecting 300Hz) of microwave sounding signal.
The beneficial effect that the technical scheme that the utility model embodiment provides is brought is: by the first modulus sampling unit, be used for gathering the frequency discrimination signal that described physical system is exported under the microwave interrogation signals effect of non-modulated; The second modulus sampling unit is used for gathering the voltage-controlled signal of frequency discrimination signal after described servo loop is phase-locked that described physical system is exported under the microwave interrogation signals effect after the modulation; Main control unit is used for output the first sweep voltage and the second sweep voltage to described VCXO, so that the signal that described VCXO output frequency changes; And according to the corresponding relation of the electrical voltage point of the corresponding relation of the electrical voltage point of described frequency discrimination signal and described the first sweep voltage and described voltage-controlled signal and described the second sweep voltage, calculate the signal to noise ratio (S/N ratio) of described atomic clock; So that utilize the original electronic circuit of atomic clock to finish the assessment of signal to noise ratio (S/N ratio), simplified the signal to noise ratio (S/N ratio) estimation flow, saved resource; And, utilize respectively the corresponding relation of the electrical voltage point of the corresponding relation of electrical voltage point of described frequency discrimination signal and described the first sweep voltage and described voltage-controlled signal and described the second sweep voltage to calculate signal to noise ratio (S/N ratio), improved the accuracy of the signal to noise ratio (S/N ratio) of atomic clock.
The above only is preferred embodiment of the present utility model, and is in order to limit the utility model, not all within spirit of the present utility model and principle, any modification of doing, is equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (2)
1. atomic clock signal-to-noise ratio measurement apparatus, described atomic clock comprises VCXO, synthesizer, servo loop, microwave times mixting circuit and physical system, it is characterized in that described device comprises:
Be used for gathering described physical system at the first modulus sampling unit of the frequency discrimination signal of exporting under the microwave interrogation signals effect of non-modulated, be used for gathering the second modulus sampling unit of the voltage-controlled signal of frequency discrimination signal after described servo loop is phase-locked that described physical system exports under the microwave interrogation signals effect after the modulation and be used for output the first sweep voltage and the second sweep voltage to described VCXO, so that the signal that described VCXO output frequency changes; And according to the corresponding relation of the electrical voltage point of the corresponding relation of the electrical voltage point of described frequency discrimination signal and described the first sweep voltage and described voltage-controlled signal and described the second sweep voltage, calculate the main control unit of the signal to noise ratio (S/N ratio) of described atomic clock; The microwave interrogation signals of described non-modulated is the signal of the output signal of described VCXO and simple signal generation after described microwave times mixting circuit is processed that described synthesizer is exported; Microwave interrogation signals after the described modulation is the signal of the output signal of described VCXO and keying FM signal generation after described microwave times mixting circuit is processed that described synthesizer is exported.
2. device as claimed in claim 1 is characterized in that, described main control unit is the microprocessor in the described atomic clock.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102811056A (en) * | 2012-07-19 | 2012-12-05 | 江汉大学 | Signal to noise ratio evaluation device and method for rubidium atomic frequency standard |
| CN104811197A (en) * | 2015-03-30 | 2015-07-29 | 江汉大学 | Synchronous phase discrimination method and atomic frequency standard |
| CN107272394A (en) * | 2017-06-16 | 2017-10-20 | 江汉大学 | A kind of integrated resonant time dissemination system calibration method of backup formula |
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2012
- 2012-07-19 CN CN 201220351216 patent/CN202758005U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102811056A (en) * | 2012-07-19 | 2012-12-05 | 江汉大学 | Signal to noise ratio evaluation device and method for rubidium atomic frequency standard |
| CN102811056B (en) * | 2012-07-19 | 2015-10-21 | 江汉大学 | A kind of signal to noise ratio apparatus for evaluating of Rb atom frequency marking and method |
| CN104811197A (en) * | 2015-03-30 | 2015-07-29 | 江汉大学 | Synchronous phase discrimination method and atomic frequency standard |
| CN107272394A (en) * | 2017-06-16 | 2017-10-20 | 江汉大学 | A kind of integrated resonant time dissemination system calibration method of backup formula |
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