CN203366002U - Atomic clock - Google Patents
Atomic clock Download PDFInfo
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- CN203366002U CN203366002U CN 201320313504 CN201320313504U CN203366002U CN 203366002 U CN203366002 U CN 203366002U CN 201320313504 CN201320313504 CN 201320313504 CN 201320313504 U CN201320313504 U CN 201320313504U CN 203366002 U CN203366002 U CN 203366002U
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- atomic clock
- correction voltage
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Abstract
The utility model discloses an atomic clock and belongs to the field of signal sources. The atomic clock comprises a VCXO, a quantum system and a synchronous phase discrimination module, wherein the synchronous phase discrimination module is used for carrying phase demodulation on quantum frequency discrimination signals provided by the quantum system and a reference signal to obtain a phase discrimination result. The atomic clock further comprises a first voltage reference and a processing module. The first voltage reference is used for providing preset first rectification voltage for the VCXO; the first voltage reference and the VCXO are located at the same working environment; the product of the temperature coefficient of the first voltage reference and the voltage control slope of the VCXO plus the temperature coefficient of the VCXO is equal to zero. The processing module is used for obtaining second rectification voltage according to the phase discrimination result of the synchronous phase discrimination module, and providing the second rectification voltage for the VCXO. The first voltage reference is connected with the VCXO. The processing module is respectively connected with the synchronous phase discrimination module and the VCXO. By means of the atomic clock, the output of the VCXO is not affected by temperature changes.
Description
Technical field
The utility model relates to the signal source field, particularly a kind of atomic clock.
Background technology
Atomic clock, as high stable, high-precision clock source, just is being widely used in the various fields such as space flight, navigation and communication.
Existing atomic clock mainly comprises VCXO(Voltage Controlled X'tal Oscillator, VCXO), microwave interrogation signals generation module, quantized system and synchronous phase demodulation module.Wherein, the signal of VCXO output is processed and is produced the microwave interrogation signals through comprehensive, the SHG and THG of microwave interrogation signals generation module, after this microwave interrogation signals acts on quantized system, produces quantum frequency discrimination signal; Synchronous phase demodulation module provides this quantum frequency discrimination signal reference signal with microwave interrogation signals generation module is synchronizeed phase demodulation, produce correction voltage and act on VCXO, thereby change the output of VCXO, and then VCXO output is locked on the hyperfine 0-0 centre frequency of atomic ground state.
In realizing process of the present utility model, the inventor finds that at least there is following problem in prior art: in actual atomic clock application, when the working temperature generation subtle change of VCXO, the frequency of VCXO output signal will produce skew thereupon, thereby affect the degree of stability of atomic clock complete machine output.
The utility model content
For the frequency that solves the VCXO output signal is subject to the problem of influence of temperature change, the utility model embodiment provides a kind of atomic clock.Described technical scheme is as follows:
The utility model embodiment provides a kind of atomic clock, described atomic clock comprises VCXO, for quantized system that quantum frequency discrimination signal is provided and for the quantum frequency discrimination signal that described quantized system is provided, is synchronizeed phase demodulation with reference signal, obtain the synchronous phase demodulation module of identified result, described atomic clock also comprises:
Be used to described VCXO that the first voltage reference of preset the first correction voltage is provided; Described the first voltage reference and described VCXO are in same working environment, after the temperature coefficient of described the first voltage reference is multiplied by the voltage-controlled slope of described VCXO, the temperature coefficient that adds the above VCXO equals zero;
For according to the identified result of described synchronous phase demodulation module, obtaining the second correction voltage, for described VCXO provides the processing module of described the second correction voltage;
Described the first voltage reference is connected with described VCXO, and described processing module is connected with described VCXO with the described phase demodulation module of synchronizeing respectively.
Alternatively, described atomic clock also comprises:
For under the effect of reference voltage, the second correction voltage that described processing module is provided carries out digital-to-analog conversion, and the correction of second after changing Voltage-output is to the D/A converter module of described VCXO; Described processing module is connected with described VCXO by described D/A converter module.
Alternatively, described atomic clock also comprises:
Be used to described D/A converter module that the second voltage benchmark of described reference voltage is provided; Described second voltage benchmark and described VCXO are in same working environment, and the temperature coefficient of described the first voltage reference is identical with the temperature coefficient of described second voltage benchmark; Described second voltage benchmark is connected with described D/A converter module.
Preferably, described processing module comprises:
For the corresponding relation with correction voltage in preset identified result, obtain the acquiring unit of correction voltage corresponding to the identified result of described synchronous phase demodulation module; And
Deduct described the first preset correction voltage for correction voltage corresponding to described identified result that described acquiring unit is obtained, obtain the processing unit of described the second correction voltage;
Described processing unit is connected with described acquiring unit.
Alternatively, described processing module also comprises:
For judging that the second correction voltage that described processing unit obtains is whether in preset range; When described the second correction voltage is in described preset range, export described the second correction voltage; When described the first correction voltage is not in described preset range, the performance element using preset correction voltage as described the second correction voltage output; Described performance element is connected with described processing unit.
Alternatively, described processing module also comprises:
For described the second correction voltage that adopts compensation correction voltage to obtain described processing unit, compensate, described the second correction voltage after the output compensation is to the compensating unit of described VCXO, the day aging drift rate that described compensation correction voltage equals described VCXO is multiplied by the voltage-controlled slope of described VCXO, and described compensating unit is connected with described processing unit.
Alternatively, described atomic clock also comprises:
The temperature control modules that is predetermined temperature for the temperature of working environment of controlling described atomic clock.
Preferably, described temperature control modules comprises:
Detecting unit for detection of the actual temperature of described working environment;
Actual temperature and the described predetermined temperature of the described working environment detected for more described detecting unit, obtain the comparing unit of comparative result; And
For the comparative result obtained according to described comparing unit, the regulon that is predetermined temperature by the adjustment of described working environment;
Described comparing unit is connected with described regulon with described detecting unit respectively.
Preferably, described detecting unit comprises thermistor.
Preferably, described regulon comprises Temperature Controlling Chip.
The beneficial effect that the technical scheme that the utility model embodiment provides is brought is: by the first voltage reference and VCXO in same working environment, the first voltage reference provides preset the first correction voltage for VCXO, after the temperature coefficient of the first voltage reference is multiplied by the voltage-controlled slope of VCXO, add that the temperature coefficient that VCXO has under the working temperature of determining equals zero; Due to the variation along with temperature, VCXO is subject to the impact of temperature, and the frequency of its output signal also changes thereupon; Simultaneously, the first voltage reference is subject to the impact of temperature, and the voltage of its output also changes thereupon; And, when the voltage of the first voltage reference output also changes, VCXO is subject to the impact of the voltage of the first voltage reference output thereupon, the frequency of output signal also will change; Therefore, voltage causes the variation of the frequency of VCXO output signal compensation temperature to be caused to the variation of the frequency of VCXO output signal, thereby the frequency of VCXO output signal is not acted upon by temperature changes, and has improved the degree of stability of atomic clock complete machine.
The accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, in below describing embodiment, the accompanying drawing of required use is briefly described, apparently, accompanying drawing in the following describes is only 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 a kind of atomic clock of providing of the utility model embodiment;
Fig. 2 is the structural representation of another atomic clock of providing of the utility model embodiment.
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.
Embodiment
The utility model embodiment provides a kind of atomic clock, referring to Fig. 1, this atomic clock comprises VCXO100, for quantized system 110 that quantum frequency discrimination signal is provided and for the quantum frequency discrimination signal that quantized system 110 is provided, is synchronizeed phase demodulation with reference signal, obtains the synchronous phase demodulation module 120 of identified result.This atomic clock also comprises:
The first voltage reference 101, in same working environment, be used to VCXO100 that the first preset correction voltage is provided with VCXO100.After the temperature coefficient of the first voltage reference 101 is multiplied by the voltage-controlled slope of VCXO100, add that the temperature coefficient of VCXO100 equals zero.Processing module 102, obtain the second correction voltage for the identified result according to synchronous phase demodulation module 120, for VCXO100 provides this second correction voltage.
The temperature coefficient of the first voltage reference 101 is, 1 ℃ of the every variation of temperature, the rate of change of the voltage that the voltage of the first voltage reference 101 outputs is exported before with respect to temperature variation.
The temperature coefficient of VCXO100 is, 1 ℃ of the every variation of temperature, the frequency of VCXO100 output signal with respect to temperature variation before the rate of change of frequency of output signal.The voltage-controlled slope of VCXO100 is that the frequency of VCXO100 output signal is with respect to the rate of change of input VCXO100 voltage.
The temperature coefficient of the first voltage reference 101 and VCXO100 can be provided by production firm, or obtains by test.The temperature coefficient that obtains VCXO100 by test of take is example, introduces this process of the test.At first, VCXO is placed in the environment of a constant temperature, the temperature of this environment is adjustable, and tunable steps is 0.1 degree (according to the difference of required precision, this tunable steps can be different).Then, by tunable steps, change gradually the environment temperature of VCXO work, and adopt the corresponding output frequency value of counter records VCXO, obtain the temperature variant intensity of variation of frequency of the output signal of VCXO, i.e. temperature coefficient.
Wherein, the first voltage reference 101 is connected with VCXO100, is used to VCXO100 that the first preset correction voltage is provided.The first voltage reference 101 and VCXO100 are in same working environment.That is to say, the first voltage reference 101 is identical with the temperature of the working environment of VCXO100.
Wherein, processing module 102 respectively with synchronize phase demodulation module 120 and be connected with VCXO100, obtain the second correction voltage for the identified result according to synchronous phase demodulation module 1, for VCXO100 provides this second correction voltage.
Preferably, referring to Fig. 2, processing module 102 comprises: for the corresponding relation of the identified result preset-correction voltage, obtain the acquiring unit 1021 of correction voltage corresponding to the identified result of synchronous phase demodulation module 120; And corresponding correction voltage deducts the first preset correction voltage for the identified result that acquiring unit 1021 is obtained, obtain and export the processing unit 1022 of the second correction voltage.Acquiring unit 1021 is connected with processing unit 1022.
Particularly, the identified result of synchronous phase demodulation module 120 can be the frequency of quantum frequency discrimination signal.The corresponding relation of identified result-correction voltage can comprise: the mapping relations between the correction magnitude of voltage of the frequency of quantum frequency discrimination signal and input VCXO100, this correction magnitude of voltage has determined the frequency that the frequency of VCXO100 output signal is quantum frequency discrimination signal.The corresponding relation of identified result-correction voltage can set in advance in acquiring unit 1021.
Particularly, correction voltage corresponding to identified result is comprised of the second correction voltage and the first correction voltage.Because the first voltage reference 101 provides the first preset correction voltage for VCXO100, therefore, the processing module 102 correction voltage that the identified result of obtaining is corresponding deducts the first preset correction voltage, obtains the second correction voltage and offers VCXO100.
Alternatively, processing module 102 also comprises: for judging that the second correction voltage that processing unit 1022 obtains is whether in preset range; When the second correction voltage is in preset range, export this second correction voltage; When the second correction voltage is not in preset range, the performance element 1023 of also exporting preset correction voltage as the second correction voltage.Performance element 1023 is connected with processing unit 1022.
Particularly, stored the preset range of the second correction voltage in performance element 1023, this preset range has determined the scope of VCXO100 output signal frequency.Suppose that this preset range is for [V1, V2], V1 > V2.After processing unit 1022 obtains the second correction magnitude of voltage V, performance element 1023 judges whether V is positioned at [V1, V2], if V is not positioned at [V1, V2] (V > V2 or V<V1), using preset correction magnitude of voltage V0 as the first correction voltage and output, otherwise, if V is positioned at [V1, V2] (V1<V<V2), export V.Like this, in being controlled among a small circle by atomic clock complete machine output frequency, make the atomic clock output frequency be linear change, be convenient to adopt existing measurement scheme (first by least square method deduction drift recycling Allan variance computational stability) to be assessed the frequency stability of atomic clock complete machine output signal.
Alternatively, processing module 102 also comprises: for adopting the second correction voltage that compensation correction voltage obtains processing unit 1022, compensate, the second correction voltage after the output compensation is to the compensating unit 1024 of VCXO100.Wherein, the day aging drift rate that this compensation correction voltage equals VCXO100 is multiplied by the voltage-controlled slope of VCXO100.Compensating unit 1024 is connected with processing unit 1022.
Particularly, the day aging drift rate of VCXO100 is, the aging drift rate of VCXO100 every day.Day, aging drift rate can be calculated (the annual aging drift rate is divided by 365) according to the annual aging drift rate of VCXO100.The annual aging drift rate can be provided by the production firm of VCXO100.
Particularly, compensation correction voltage will cause that the frequency of VCXO100 output signal changes, and the variation of this frequency can compensate VCXO100 because the frequency change that aging drift causes affects, and then improves the degree of stability of atomic clock complete machine output signal.
Alternatively, this atomic clock also comprises: the temperature control modules 103 that is predetermined temperature for the temperature of controlling working environment.
Preferably, referring to Fig. 2, temperature control modules 103 comprises:
Detecting unit 1031, for detection of the actual temperature of working environment.Comparing unit 1032, be connected with detecting unit 1031, and actual temperature and predetermined temperature for the working environment that relatively detecting unit 1031 detects, obtain comparative result.Regulon 1033, be connected with comparing unit 1032, for the comparative result obtained according to comparing unit 1032, by the adjustment of working environment, is predetermined temperature.Preferably, detecting unit 1031 can comprise thermistor.Preferably, regulon 1033 can comprise Temperature Controlling Chip.
Preferably, referring to Fig. 2, this atomic clock also comprises D/A converter module 104: this D/A converter module 104 is connected with processing module 102 with VCXO100 respectively, for under the effect of reference voltage, the second correction voltage that processing module 102 is provided carries out digital-to-analog conversion, and the correction of second after changing Voltage-output is to VCXO100.
Particularly, the structure of D/A converter module 104, with the structure of existing D/A converter module, is not described in detail in this.
Preferably, referring to Fig. 2, this atomic clock also comprises second voltage benchmark 105: this second voltage benchmark 105 with D/A converter module 104, be connected and with VCXO100 in same working environment, be used to D/A converter module 104 that reference voltage is provided.The temperature coefficient of the first voltage reference 101 is identical with the temperature coefficient of second voltage benchmark 105.
Particularly, the first voltage reference 101 and second voltage benchmark 105 have respectively the temperature characterisitic contrary with VCXO100.For example, suppose the be respectively-1E-3(V/ ℃ of temperature coefficient of the first voltage reference 101 or second voltage benchmark 105), the temperature coefficient that VCXO100 has is+1E-10(℃), the voltage-controlled slope of VCXO100 is 1E-7(V).Can obtain like this-1E-3(V/ ℃) * 1E-7(V)+1E-10(℃)=0.
Along with the variation of the temperature of working environment, the frequency of VCXO100 output signal varies with temperature and changes, and simultaneously, the voltage of the first voltage reference 101 and 105 outputs of second voltage benchmark is variation with temperature and changing also.For the first voltage reference 101, when the first correction voltage of the first voltage reference 101 outputs changes, the first correction voltage of exporting due to the first voltage reference 101 inputs to VCXO100, therefore, the variation voltage of the first voltage reference 101 outputs will directly cause the variation of the frequency of VCXO100 output signal.For second voltage benchmark 105, when the voltage of second voltage benchmark 105 outputs changes, because second voltage benchmark 105 provides reference voltage for D/A converter module 104, and the variation of reference voltage will make the voltage of D/A converter module 104 outputs change, therefore, under the voltage effect of the variation of inputting in D/A converter module 104, the frequency of VCXO100 output signal will change.That is to say, along with the variation of temperature, VCXO100 is subject to the impact of temperature, and the frequency of its output signal changes thereupon.And the first voltage reference 101 and second voltage benchmark 105 are subject to the impact of temperature, both also change by the voltage of output thereupon.Like this, when the voltage of the first voltage reference 101 and 105 outputs of second voltage benchmark also changes thereupon, the frequency of VCXO100 output signal also will change.Voltage causes the variation of the frequency of VCXO100 output signal compensation temperature to be caused to the variation of the frequency of VCXO100 output signal, thereby the frequency of VCXO100 output signal is not acted upon by temperature changes, and has improved the degree of stability of atomic clock complete machine.
The beneficial effect that the above-mentioned atomic clock that the utility model embodiment provides brings is: by the first voltage reference and VCXO in same working environment, the first voltage reference provides preset the first correction voltage for VCXO, after the temperature coefficient of the first voltage reference is multiplied by the voltage-controlled slope of VCXO, add that the temperature coefficient that VCXO has under the working temperature of determining equals zero; Due to the variation along with temperature, VCXO is subject to the impact of temperature, and the frequency of its output signal also changes thereupon; Simultaneously, the first voltage reference is subject to the impact of temperature, and the voltage of its output also changes thereupon; And, when the voltage of the first voltage reference output also changes, VCXO is subject to the impact of the voltage of the first voltage reference output thereupon, the frequency of output signal also will change; Therefore, voltage causes the variation of the frequency of VCXO output signal compensation temperature to be caused to the variation of the frequency of VCXO output signal, thereby the frequency of VCXO output signal is not acted upon by temperature changes, and has improved the degree of stability of atomic clock complete machine.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (10)
1. an atomic clock, described atomic clock comprises VCXO, for quantized system that quantum frequency discrimination signal is provided and for the quantum frequency discrimination signal that described quantized system is provided, is synchronizeed phase demodulation with reference signal, obtain the synchronous phase demodulation module of identified result, it is characterized in that, described atomic clock also comprises:
Be used to described VCXO that the first voltage reference of preset the first correction voltage is provided; Described the first voltage reference and described VCXO are in same working environment, after the temperature coefficient of described the first voltage reference is multiplied by the voltage-controlled slope of described VCXO, the temperature coefficient that adds the above VCXO equals zero;
For according to the identified result of described synchronous phase demodulation module, obtaining the second correction voltage, for described VCXO provides the processing module of described the second correction voltage;
Described the first voltage reference is connected with described VCXO, and described processing module is connected with described VCXO with the described phase demodulation module of synchronizeing respectively.
2. atomic clock according to claim 1, is characterized in that, described atomic clock also comprises:
For under the effect of reference voltage, the second correction voltage that described processing module is provided carries out digital-to-analog conversion, and the correction of second after changing Voltage-output is to the D/A converter module of described VCXO; Described processing module is connected with described VCXO by described D/A converter module.
3. atomic clock according to claim 2, is characterized in that, described atomic clock also comprises:
Be used to described D/A converter module that the second voltage benchmark of described reference voltage is provided; Described second voltage benchmark and described VCXO are in same working environment, and the temperature coefficient of described the first voltage reference is identical with the temperature coefficient of described second voltage benchmark; Described second voltage benchmark is connected with described D/A converter module.
4. atomic clock according to claim 3, is characterized in that, described processing module comprises:
For the corresponding relation with correction voltage in preset identified result, obtain the acquiring unit of correction voltage corresponding to the identified result of described synchronous phase demodulation module; And
Deduct described the first preset correction voltage for correction voltage corresponding to described identified result that described acquiring unit is obtained, obtain the processing unit of described the second correction voltage;
Described processing unit is connected with described acquiring unit.
5. atomic clock according to claim 4, is characterized in that, described processing module also comprises:
For judging that the second correction voltage that described processing unit obtains is whether in preset range; When described the second correction voltage is in described preset range, export described the second correction voltage; When described the first correction voltage is not in described preset range, the performance element using preset correction voltage as described the second correction voltage output; Described performance element is connected with described processing unit.
6. atomic clock according to claim 4, is characterized in that, described processing module also comprises:
For described the second correction voltage that adopts compensation correction voltage to obtain described processing unit, compensate, described the second correction voltage after the output compensation is to the compensating unit of described VCXO, the day aging drift rate that described compensation correction voltage equals described VCXO is multiplied by the voltage-controlled slope of described VCXO, and described compensating unit is connected with described processing unit.
7. according to the described atomic clock of claim 1-6 any one, it is characterized in that, described atomic clock also comprises:
The temperature control modules that is predetermined temperature for the temperature of working environment of controlling described atomic clock.
8. atomic clock according to claim 7, is characterized in that, described temperature control modules comprises:
Detecting unit for detection of the actual temperature of described working environment;
Actual temperature and the described predetermined temperature of the described working environment detected for more described detecting unit, obtain the comparing unit of comparative result; And
For the comparative result obtained according to described comparing unit, the regulon that is predetermined temperature by the adjustment of described working environment;
Described comparing unit is connected with described regulon with described detecting unit respectively.
9. atomic clock according to claim 8, is characterized in that, described detecting unit comprises thermistor.
10. atomic clock according to claim 8, is characterized in that, described regulon comprises Temperature Controlling Chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320313504 CN203366002U (en) | 2013-05-31 | 2013-05-31 | Atomic clock |
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| CN 201320313504 CN203366002U (en) | 2013-05-31 | 2013-05-31 | Atomic clock |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326719A (en) * | 2013-05-31 | 2013-09-25 | 江汉大学 | Voltage controlled crystal oscillating device used in atomic frequency standard |
| CN107783412A (en) * | 2017-11-03 | 2018-03-09 | 中国科学院国家授时中心 | Two photon transition rubidium atomic clock |
| CN111490781A (en) * | 2020-04-22 | 2020-08-04 | 中国科学院国家授时中心 | Time keeping method for driving voltage-controlled crystal oscillator based on temperature change difference |
-
2013
- 2013-05-31 CN CN 201320313504 patent/CN203366002U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326719A (en) * | 2013-05-31 | 2013-09-25 | 江汉大学 | Voltage controlled crystal oscillating device used in atomic frequency standard |
| CN107783412A (en) * | 2017-11-03 | 2018-03-09 | 中国科学院国家授时中心 | Two photon transition rubidium atomic clock |
| CN107783412B (en) * | 2017-11-03 | 2019-11-19 | 中国科学院国家授时中心 | Two photon transition rubidium atomic clock |
| CN111490781A (en) * | 2020-04-22 | 2020-08-04 | 中国科学院国家授时中心 | Time keeping method for driving voltage-controlled crystal oscillator based on temperature change difference |
| CN111490781B (en) * | 2020-04-22 | 2023-05-26 | 中国科学院国家授时中心 | Time keeping method for controlling voltage-controlled crystal oscillator based on temperature variation difference |
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Granted publication date: 20131225 Termination date: 20140531 |