CN203164615U - Pulse-type passive rubidium atomic clock - Google Patents
Pulse-type passive rubidium atomic clock Download PDFInfo
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- CN203164615U CN203164615U CN 201320073189 CN201320073189U CN203164615U CN 203164615 U CN203164615 U CN 203164615U CN 201320073189 CN201320073189 CN 201320073189 CN 201320073189 U CN201320073189 U CN 201320073189U CN 203164615 U CN203164615 U CN 203164615U
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Abstract
The utility model discloses a pulse-type passive rubidium atomic clock, and belongs to the field of atomic clocks. The atomic clock comprises a frequency doubling module, an integrating module, a frequency mixing module and a servo module; the frequency doubling module is used for performing frequency doubling on frequency signals outputted by a voltage-controlled crystal oscillator to obtain frequency-doubled signals, and outputting the frequency-doubled signals under the action of time sequence signals; the integrating module is used for outputting integratedly-modulated signals under the action of keyed frequency-modulated signals; the frequency mixing module is used for performing frequency mixing on the integratedly-modulated signals outputted by the integrating module and the frequency-doubled signals outputted by the frequency doubling module to obtain pulse signals, and outputting the pulse signals to a physical system to serve as microwave polling signals; the servo module is used for collecting frequency discrimination signals detected by a photocell in the physical system under the action of second time sequence signals; the frequency doubling module is connected with the voltage-controlled crystal oscillator, the integrating module and the frequency mixing module; the integrating module is connected with the frequency mixing module which is connected with the physical system; and the servo motor is connected with the physical system and the voltage-controlled crystal oscillator. Line width of the atomic clock is compressed.
Description
Technical field
The utility model relates to the atomic clock field, particularly a kind of pulsed passive Rb atomic clock.
Background technology
After the physical system of a passive Rb atomic clock and the electronic circuit moulding, next step will test to verify passive Rb atomic clock machine performance.Passive Rb atomic clock machine performance comprises the natural width of physical system.Usually, live width is more narrow, and the frequency discrimination slope of physical system is more big, and the stability of passive Rb atomic clock complete machine is more good.Therefore, in order to obtain stability preferably, the live width of passive Rb atomic clock complete machine should be compressed as much as possible, makes live width become narrow.
The utility model content
In order to solve prior art problems, the utility model embodiment provides a kind of pulsed passive Rb atomic clock.Described technical scheme is as follows:
The utility model embodiment provides a kind of pulsed passive Rb atomic clock, and described passive Rb atomic clock comprises physical system and VCXO, and described passive Rb atomic clock also comprises:
Be used for the frequency signal of described VCXO output is carried out frequency multiplication, obtain frequency-doubled signal, and under the first clock signal effect, export times frequency module of described frequency-doubled signal;
Be used under the effect of keying FM signal, exporting the comprehensive module of comprehensive modulation signal;
Be used for the comprehensive modulation signal of described comprehensive module output and the frequency-doubled signal of described times of frequency module output are carried out mixing, obtain pulse signal, and described pulse signal is exported to the frequency mixing module of described physical system as the microwave interrogation signals;
Be used under the second clock signal effect, gather the frequency discrimination signal of the photoelectric cell detection in the described physical system and export voltage-controlled voltage to the servo module of described VCXO according to described frequency discrimination signal;
Described first clock signal and described keying FM signal are with the frequency homophase;
Described times of frequency module is connected with described frequency mixing module with described VCXO, described comprehensive module respectively, described comprehensive module is connected with described frequency mixing module, described frequency mixing module is connected with described physical system, and described servo module is connected with described VCXO with described physical system respectively.
Wherein, described comprehensive module comprises:
Be used under the effect of described keying FM signal, export the digital frequency synthesizer of described comprehensive modulation signal, the frequency of described comprehensive modulation signal changes according to first predeterminated frequency, second predeterminated frequency, the 3rd predeterminated frequency and the 4th predeterminated frequency sequence period ground, half of the difference of described first predeterminated frequency and described the 3rd predeterminated frequency is less than default live width, described second predeterminated frequency and described the 4th predeterminated frequency are 0, and described keying FM signal is that dutycycle is the square-wave signal of 1:1; And
Be used for providing the microprocessor of described keying FM signal, described first clock signal and described second clock signal, when the frequency of described comprehensive modulation signal is changed to described the 4th predeterminated frequency from described the 3rd predeterminated frequency, described second clock signal is high level, and the duration of each described high level is the duration of described the 4th predeterminated frequency smaller or equal to the frequency of described comprehensive modulation signal;
Described digital frequency synthesizer is connected with described frequency mixing module with described microprocessor respectively, and described microprocessor is connected with described servo module with described times of frequency module respectively.
The beneficial effect that the technical scheme that the utility model embodiment provides is brought is: the frequency signal of VCXO being exported by times frequency module carries out frequency multiplication, obtains frequency-doubled signal, and under the first clock signal effect, exports described frequency-doubled signal; Comprehensive module is exported comprehensive modulation signal under the effect of keying FM signal; Frequency mixing module is carried out mixing with the comprehensive modulation signal of described comprehensive module output and the frequency-doubled signal of described times of frequency module output, obtains pulse signal, and exports described pulse signal to physical system as the microwave interrogation signals; Servo module is gathered the frequency discrimination signal of the photoelectric cell detection in the described physical system and is exported voltage-controlled voltage to described VCXO according to described frequency discrimination signal under the second clock signal effect; Described first clock signal and described keying FM signal are with the frequency homophase; After the coupling ring of microwave interrogation signals in physical system of pulsed is coupled into microwave cavity in the physical system, atom in the chamber successively can pass through two microwave radiation fields that phase place is identical, and with atom and microwave radiation field relevant interaction takes place, both effective interaction times obtain prolonging like this, thereby have effectively compressed the live width of physical system.
Description of drawings
In order to be illustrated more clearly in the technical scheme among the utility model embodiment, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below 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 other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the pulsed passive Rb atomic clock that provides of the utility model embodiment;
Fig. 2 is the structural representation of the comprehensive module that provides of the utility model embodiment;
Fig. 3 is the structural representation of the digital frequency synthesizer that provides of the utility model embodiment;
Fig. 4 is the structural representation of the microprocessor that provides of the utility model embodiment;
Fig. 5 is the sequential chart of the keying FM signal that provides of the utility model embodiment, comprehensive modulation signal, first clock signal and second clock signal.
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 pulsed passive Rb atomic clock, and referring to Fig. 1, this passive Rb atomic clock comprises physical system 10 and VCXO 11.This atomic clock also comprises:
Be used for the frequency signal of VCXO 11 outputs is carried out frequency multiplication, obtain frequency-doubled signal, and under the first clock signal effect, times frequency module 101 of output frequency-doubled signal; Be used under the effect of keying FM signal, exporting the comprehensive module 102 of comprehensive modulation signal; Be used for the comprehensive modulation signal of comprehensive module 102 outputs and the frequency-doubled signal of times frequency module 101 outputs are carried out mixing, produce pulse signal, and this pulse signal is exported to the frequency mixing module 103 of physical system 10 as the microwave interrogation signals; Be used under the second clock signal effect, gather the frequency discrimination signal of the photoelectric cell detection in the physical system 10 and export voltage-controlled voltage to the servo module 104 of VCXO 11 according to the frequency discrimination signal.
Wherein, first clock signal and keying FM signal are with the frequency homophase.Times frequency module 101 is connected with frequency mixing module 103 with VCXO 11, comprehensive module 102 respectively, comprehensive module 102 is connected with frequency mixing module 103, frequency mixing module 103 is connected with physical system 10, and servo module 104 is connected with VCXO 11 with physical system 10 respectively.
Particularly, refer again to Fig. 1, physical system 10 comprises spectrum lamp 10a, integrated filtering resonance bubble 10b, microwave cavity 10c, C field coil 10d, photoelectric cell 10e and coupling ring 10f.Physical system 10 can be finished the quantum frequency discrimination function of physical system in traditional passive Rb atomic clock.The microwave interrogation signals of frequency mixing module 103 outputs is coupled into the transition of inquiring after the atom in the chamber among the microwave cavity 10c through coupling ring 10f.Servo module 104 is connected with photoelectric cell 10e.This is well known content, is not described in detail in this.
Wherein, times frequency module 101 is under the first clock signal effect, and the output frequency-doubled signal specifically comprises: when first clock signal is high level, and times frequency module 101 output frequency-doubled signals; When first clock signal was low level, times frequency module 101 was not exported frequency-doubled signal.Be understandable that what times frequency module 101 was exported is the frequency-doubled signal of pulsed.
Wherein, referring to Fig. 2, comprehensive module 102 comprises: be used for exporting the DDS(Direct Digital Synthesizer of comprehensive modulation signal, digital frequency synthesizer under the effect of keying FM signal) 1021; And, for the microprocessor 1022 that keying FM signal, first clock signal and second clock signal are provided.Wherein, DDS1021 is connected with frequency mixing module 103 with microprocessor 1022 respectively, and microprocessor 1022 is connected with servo module 104 with times frequency module 101 respectively.
Wherein, the frequency of this comprehensive modulation signal changes according to first predeterminated frequency, second predeterminated frequency, the 3rd predeterminated frequency and the 4th predeterminated frequency sequence period ground.And half of the difference of first predeterminated frequency and the 3rd predeterminated frequency is less than default live width, and second predeterminated frequency and the 4th predeterminated frequency are 0.Particularly, this keying FM signal is that dutycycle is high level and low level lasting half period respectively in the 1:1(one-period) square-wave signal.
Particularly, referring to Fig. 3 and Fig. 4, the external clock end Input of the external clock end XTAL of microprocessor 1022 and DDS1021 all inserts the output frequency signal from VCXO 11, and namely microprocessor 1022 and DDS1021 are the work clock signal with the output frequency signal of VCXO 11 all.29 ends of DDS1021 are keying FM signal input end.
Particularly, suppose that first predeterminated frequency, second predeterminated frequency, the 3rd predeterminated frequency and the 4th predeterminated frequency are respectively F1, F2, F3 and F4.The first predeterminated frequency F1, second frequency F2, the 3rd predeterminated frequency F3 and the 4th predeterminated frequency F4 can be arranged among the DDS1021 by command word by microprocessor 1022.There are two registers DDS1021 inside, and microprocessor 1022 can be kept at the first predeterminated frequency F1, the second predeterminated frequency F2 in the register respectively earlier.When 29 ends of DDS1021 have the input of keying FM signal, the output terminal Output of DDS1021 will read the first predeterminated frequency F1 or the second predeterminated frequency F2 respectively thereupon from register, and exports the comprehensive modulation signal of the first predeterminated frequency F1 or the second predeterminated frequency F2.When the output terminal Output of DDS1021 exports the comprehensive modulation signal of the second predeterminated frequency F2, microprocessor 1022 is kept at the 3rd predeterminated frequency F3, the 4th predeterminated frequency F4 respectively in the register again and (has covered the original first predeterminated frequency F1 and the second predeterminated frequency F2 that preserves of register), then when the next cycle of keying FM signal arrives, the output terminal Output of DDS1021 will read the 3rd predeterminated frequency F3 or the 4th predeterminated frequency F4 respectively thereupon from register, and exports the comprehensive modulation signal of the 3rd predeterminated frequency F3 or the 4th predeterminated frequency F4.Circulation successively, like this, the comprehensive modulation signal of DDS1021 output changes according to the first predeterminated frequency F1, the second predeterminated frequency F2, the 3rd predeterminated frequency F3 and the 4th frequency F4 sequence period ground.
Referring to Fig. 5, suppose that the keying FM signal is FSK, the comprehensive modulation signal of DDS1021 output is f
DDS, first clock signal is f1.Further, suppose when the high level 1 of some cycle C of keying FM signal FSK the comprehensive modulation signal f of DDS1021 output
DDSFrequency be the first predeterminated frequency F1, at this moment, the first clock signal f1 also is high level 1, times frequency module 101 output frequency-doubled signals; When the low level 0 of cycle C, the comprehensive modulation signal f of DDS1021 output
DDSFrequency be the second predeterminated frequency F2, at this moment, the first clock signal f1 also is low level 0, times frequency module 101 is not exported frequency-doubled signal.So, when the high level 1 of the next cycle of the cycle C of keying FM signal FSK, the comprehensive modulation signal f of DDS1021 output
DDSFrequency be the 3rd predeterminated frequency F3, at this moment, the first clock signal f1 also is high level 1, times frequency module 101 output frequency-doubled signals; When the low level 0 of the next cycle of cycle C, the comprehensive modulation signal f of DDS1021 output
DDSFrequency be the 4th predeterminated frequency F4, at this moment, the first clock signal f1 also is low level 0, times frequency module 101 is not exported frequency-doubled signal.
More than, clock signal and keying FM signal are with the frequency homophase, when times frequency module 101 output frequency-doubled signals, DDS1021 can alternately export the comprehensive modulation signal of the first predeterminated frequency F1 and the 3rd predeterminated frequency F3, when times frequency module 101 was not exported frequency-doubled signal, DDS1021 can alternately export the comprehensive modulation signal of the second predeterminated frequency F2 and the 4th predeterminated frequency F4.Further, the second predeterminated frequency F2 and the 4th predeterminated frequency F4 are 0, are equal to DDS1021 and do not export comprehensive modulation signal, are understandable that, what comprehensive module 102 was exported is the comprehensive modulation signal of pulsed.Therefore, frequency mixing module 103 is carried out traditional mixer action according to the frequency-doubled signal of pulsed and the comprehensive modulation signal of pulsed, will produce the microwave interrogation signals of pulsed.
Wherein, the difference of first predeterminated frequency and the 3rd predeterminated frequency is depth of modulation.Usually, depth of modulation determines the live width of physical system, and half of depth of modulation is less than the live width of physical system.In the present embodiment, half of depth of modulation is set to less than default live width, and this default live width is for setting in advance.That is to say that the user can set up the live width of the physical system that needs compression on their own.Particularly, default live width should be less than the natural width of physical system.
Further, servo module 104 is gathered the frequency discrimination signal of the photoelectric cell 10e detection in the physical system 10 and is exported voltage-controlled voltage to VCXO according to the frequency discrimination signal under the second clock signal effect.In addition, second clock signal and comprehensive modulation signal exist so related: when the frequency of comprehensive modulation signal is changed to the 4th predeterminated frequency from the 3rd predeterminated frequency, second clock signal is high level, and the duration of each high level is the duration of the 4th predeterminated frequency smaller or equal to the frequency of comprehensive modulation signal.
Particularly, refer again to Fig. 5, suppose that second clock signal is f2.When DDS1021 exported the comprehensive modulation signal of the first predeterminated frequency F1, the second predeterminated frequency F2 and the 3rd predeterminated frequency F3, frequency mixing module 103 was just in time exported the microwave interrogation signals of two pulses to physical system 10.In the meantime, second clock signal is continuously low level 0, and servo module 104 is not worked.Namely, when the microwave interrogation signals of two pulses after coupling ring 10f is coupled into microwave cavity 10c, this atom that is equivalent in the chamber successively passes through two microwave radiation fields that phase place is identical, and relevant interaction takes place with atom and microwave radiation field, both effective interaction times obtain prolonging like this.
When DDS1021 exports the comprehensive modulation signal of the 4th predeterminated frequency F4, the frequency of the 4th preset comprehensive modulation signal is 0, times frequency module 101 is not exported frequency-doubled signal, frequency mixing module 103 output be that the microwave interrogation signals of pulsed just in time is low level 0, at this moment, second clock signal is high level 1, servo module 104 is gathered the frequency discrimination signal that the photoelectric cell 10e in the physical system 10 detects, this frequency discrimination signal has reflected the relevant interaction that atom and microwave radiation field take place, because both effective interaction times obtain prolonging, thereby effectively compressed the live width of physical system, thereby make servo module 104 more accurate according to the voltage-controlled voltage of frequency discrimination signal output, the degree of stability of whole passive-type atomic clock is improved.
The beneficial effect that the above-mentioned atomic clock that the utility model embodiment provides brings is: the frequency signal of VCXO being exported by times frequency module carries out frequency multiplication, obtains frequency-doubled signal, and under the first clock signal effect, the output frequency-doubled signal; Comprehensive module is exported comprehensive modulation signal under the effect of keying FM signal; Frequency mixing module is carried out mixing with the comprehensive modulation signal of comprehensive module output and the frequency-doubled signal of times frequency module output, obtains pulse signal, and exports pulse signal to physical system as the microwave interrogation signals; Servo module is gathered the frequency discrimination signal of the photoelectric cell detection in the physical system and is exported voltage-controlled voltage to VCXO according to the frequency discrimination signal under the second clock signal effect; First clock signal and keying FM signal are with the frequency homophase; After the coupling ring of microwave interrogation signals in physical system of pulsed is coupled into microwave cavity in the physical system, atom in the chamber can successively pass through two microwave radiation fields that phase place is identical, and with atom and microwave radiation field relevant interaction takes place, both effective interaction times obtain prolonging like this, thereby have effectively compressed the live width of physical system.
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. pulsed passive Rb atomic clock, described passive Rb atomic clock comprises physical system and VCXO, it is characterized in that, described passive Rb atomic clock also comprises:
Be used for the frequency signal of described VCXO output is carried out frequency multiplication, obtain frequency-doubled signal, and under the first clock signal effect, export times frequency module of described frequency-doubled signal;
Be used under the effect of keying FM signal, exporting the comprehensive module of comprehensive modulation signal;
Be used for the comprehensive modulation signal of described comprehensive module output and the frequency-doubled signal of described times of frequency module output are carried out mixing, obtain pulse signal, and described pulse signal is exported to the frequency mixing module of described physical system as the microwave interrogation signals;
Be used under the second clock signal effect, gather the frequency discrimination signal of the photoelectric cell detection in the described physical system and export voltage-controlled voltage to the servo module of described VCXO according to described frequency discrimination signal;
Described first clock signal and described keying FM signal are with the frequency homophase;
Described times of frequency module is connected with described frequency mixing module with described VCXO, described comprehensive module respectively, described comprehensive module is connected with described frequency mixing module, described frequency mixing module is connected with described physical system, and described servo module is connected with described VCXO with described physical system respectively.
2. atomic clock according to claim 1 is characterized in that, described comprehensive module comprises:
Be used under the effect of described keying FM signal, export the digital frequency synthesizer of described comprehensive modulation signal, the frequency of described comprehensive modulation signal changes according to first predeterminated frequency, second predeterminated frequency, the 3rd predeterminated frequency and the 4th predeterminated frequency sequence period ground, half of the difference of described first predeterminated frequency and described the 3rd predeterminated frequency is less than default live width, described second predeterminated frequency and described the 4th predeterminated frequency are 0, and described keying FM signal is that dutycycle is the square-wave signal of 1:1; And
Be used for providing the microprocessor of described keying FM signal, described first clock signal and described second clock signal, when the frequency of described comprehensive modulation signal is changed to described the 4th predeterminated frequency from described the 3rd predeterminated frequency, described second clock signal is high level, and the duration of each described high level is the duration of described the 4th predeterminated frequency smaller or equal to the frequency of described comprehensive modulation signal;
Described digital frequency synthesizer is connected with described frequency mixing module with described microprocessor respectively, and described microprocessor is connected with described servo module with described times of frequency module respectively.
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| CN 201320073189 CN203164615U (en) | 2013-02-16 | 2013-02-16 | Pulse-type passive rubidium atomic clock |
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| CN 201320073189 CN203164615U (en) | 2013-02-16 | 2013-02-16 | Pulse-type passive rubidium atomic clock |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105446121A (en) * | 2015-12-10 | 2016-03-30 | 江汉大学 | Physical system |
| CN107219750A (en) * | 2017-05-19 | 2017-09-29 | 中国科学院上海光学精密机械研究所 | Improve the delay line real-time noise modification method of atomic clock stability |
| 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 |
| CN113341679A (en) * | 2021-06-15 | 2021-09-03 | 郑州轻大产业技术研究院有限公司 | High-precision signal frequency control method and system based on Beidou space rubidium atomic clock |
-
2013
- 2013-02-16 CN CN 201320073189 patent/CN203164615U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105446121A (en) * | 2015-12-10 | 2016-03-30 | 江汉大学 | Physical system |
| CN107219750A (en) * | 2017-05-19 | 2017-09-29 | 中国科学院上海光学精密机械研究所 | Improve the delay line real-time noise modification method of atomic clock stability |
| CN107219750B (en) * | 2017-05-19 | 2019-09-20 | 中国科学院上海光学精密机械研究所 | Improve the delay line real-time noise modification method of atomic clock stability |
| 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 |
| CN113341679A (en) * | 2021-06-15 | 2021-09-03 | 郑州轻大产业技术研究院有限公司 | High-precision signal frequency control method and system based on Beidou space rubidium atomic clock |
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