CN114884507A - Rubidium atomic clock taming system - Google Patents
Rubidium atomic clock taming system Download PDFInfo
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- CN114884507A CN114884507A CN202210294086.8A CN202210294086A CN114884507A CN 114884507 A CN114884507 A CN 114884507A CN 202210294086 A CN202210294086 A CN 202210294086A CN 114884507 A CN114884507 A CN 114884507A
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- atomic clock
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- 229910052701 rubidium Inorganic materials 0.000 title claims abstract description 112
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 239000013078 crystal Substances 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 230000007704 transition Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/26—Automatic control of frequency or phase; Synchronisation using energy levels of molecules, atoms, or subatomic particles as a frequency reference
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- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
- G04F5/14—Apparatus for producing preselected time intervals for use as timing standards using atomic clocks
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses a rubidium atomic clock taming system, which comprises: the rubidium clock comprises a rubidium quantum unit, a rubidium servo circuit unit, a constant-temperature crystal oscillator, a complete machine frequency adjusting unit, a master control MCU, a first frequency divider, a second frequency divider, a third frequency divider, a first time digital conversion unit, a second time digital conversion unit, a digital control oscillator, a time difference processor, a digital phase-locked loop and a frequency multiplier, wherein the master control MCU is used for controlling and setting parameters of the rubidium quantum unit and working parameters of the rubidium servo circuit unit so as to complete frequency locking of a rubidium atomic clock; after the frequency locking of the rubidium atomic clock is completed, the frequency signal of the rubidium atomic clock is compared with an externally input frequency signal, and the main control MCU controls the rubidium atomic clock to adjust the frequency of the whole machine, so that the tame is completed.
Description
Technical Field
The invention relates to the field of atomic frequency standard and measurement, in particular to a rubidium atomic clock taming system.
Background
The rubidium atomic clock is a two-level frequency standard, and in use, the rubidium atomic clock usually receives a navigation satellite signal for time service and frequency taming calibration so as to obtain an accurate 10MHz frequency signal and a 1PPS pulse signal of time information.
Generally, rubidium atomic clock can only accept 1PPS signal for taming, and the rubidium atomic clock designs a frequency division coefficient of 10 through FPGA 7 The fixed frequency divider outputs 10MHz signals of rubidium atomic clock crystal oscillatorThe frequency division is 1PPS pulse signal, then a time difference measuring unit is used for measuring the rising edge time difference of the 1PPS signal and the external 1PPS (generally generated by a navigation receiver), and the time difference is always kept at a certain constant value by adjusting the frequency of a rubidium atomic clock. Because the accuracy of the 1PPS signal generated by the navigation receiver is determined by the satellite-borne clock, and the satellite-borne clock is calibrated by the ground station and is traced to the coordinated Universal Time (UTC), after the rubidium atomic clock is locked to the 1PPS signal, the frequency of the rubidium atomic clock is calibrated, and meanwhile, the 1PPS signal output by the rubidium atomic clock is synchronized to the UTC.
Unfortunately, the calibration of the rubidium atomic clock using the interference-free satellite signal transmission usually requires more than 12 hours because the interference exists in the satellite signal transmission, which causes the 1PPS signal generated by the navigation receiver to have large noise, and the rate of the 1PPS signal is too slow. Even though we have a high-level clock output of low-noise 1PPS as a standard in the field, it still takes several thousand seconds to calibrate the rubidium atomic clock frequency, which is unacceptable in some situations where fast response is required. In this case, if we use an external instrument to measure the frequency of the rubidium atomic clock and then calibrate the rubidium atomic clock manually or by a program, the required instrument is complex and requires special expertise on the operator, and thus is basically not feasible.
Disclosure of Invention
One object of the present invention is to provide a rubidium atomic clock taming system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a rubidium atomic clock taming system, comprising: rubidium quantum unit, rubidium servo circuit unit, constant temperature crystal oscillator, whole machine frequency adjusting unit, main control MCU, first frequency divider, second frequency divider, third frequency divider, first time digital conversion unit, second time digital conversion unit, numerically controlled oscillator, time difference processor, digital phase-locked loop and frequency multiplier,
the master control MCU is used for controlling and setting parameters of the rubidium quantum unit and working parameters of the rubidium servo circuit unit so as to complete frequency locking of the rubidium atomic clock;
after the frequency locking of the rubidium atomic clock is completed, the frequency signal of the rubidium atomic clock is compared with an externally input frequency signal, and the main control MCU controls the rubidium atomic clock to adjust the frequency of the whole machine, so that the tame is completed.
Optionally, when the rubidium atomic clock starts to work, the main control MCU sets parameters of the rubidium quantum unit and working parameters of the rubidium servo circuit unit, wherein the parameters include a temperature for setting the rubidium quantum unit, and after the temperature of the rubidium quantum unit is heated to a specified temperature and the working parameters of the rubidium servo circuit unit are set, the scanning circuit of the frequency starts to work, the frequency is swept out, the frequency of the rubidium atomic clock is locked, the frequency of the constant temperature crystal oscillator is locked to a rubidium transition frequency of the rubidium quantum unit, and the locking of the rubidium atomic clock is completed.
Optionally, the frequency of the constant temperature crystal oscillator is 10 MHz.
Optionally, the frequency of the constant-temperature crystal oscillator is output as the frequency of the rubidium atomic clock, and needs to be compared with an externally input frequency signal, after the comparison, the main control MCU calculates the frequency to be adjusted, the whole frequency adjusting unit starts to work, the frequency of the constant-temperature crystal oscillator is calibrated to be the same as the input frequency signal, the frequency of the rubidium atomic clock is calibrated, and time service is performed after the calibration.
Optionally, the frequency signal input from the outside is 1PPS or 10 MHz.
Optionally, the frequency signal input from outside outputs the first frequency-divided signal through the first frequency divider as the input of the first time-to-digital conversion unit, which converts the first time-to-digital conversion unit into the first time and sends the first time to the time difference processor; the frequency signal of the constant temperature crystal oscillator enters a frequency multiplier and is input to a digital controlled oscillator as a driving clock, a main control MCU controls the digital controlled oscillator and a second frequency divider to jointly output a second frequency division signal with the same frequency as the first frequency division signal as the input of a second time-to-digital conversion unit, and the second time-to-digital conversion unit converts the second frequency division signal into second time and sends the second time to a time difference processor; and the time difference processor transmits the difference value of the first time and the second time to the master control MCU, the master control MCU calculates the frequency to be adjusted and transmits the frequency to the whole frequency adjusting unit, the whole frequency adjusting unit 13 adjusts the frequency and controls the whole frequency of the rubidium atomic clock to enable the second frequency division signal and the first frequency division signal to be in phase synchronization, and therefore domestication is completed.
The invention has the following beneficial effects:
according to the technical scheme, the satellite 1PPS discipline function is realized, the function of being compatible with 10MHz signals is realized, the problem of fast calibration of rubidium atomic clock frequency can be solved without adding any instrument, and the calibration time is shortened to dozens of seconds.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a schematic structural diagram of a rubidium atomic clock taming system provided by an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
An embodiment of the present invention provides a rubidium atomic clock taming system, as shown in fig. 1, including: rubidium quantum unit 10, rubidium servo circuit unit 11, constant temperature crystal oscillator 12, complete machine frequency adjusting unit 13, main control MCU 14, first frequency divider 15, second frequency divider 16, third frequency divider 17, first time digital conversion unit 18, second time digital conversion unit 19, numerical control oscillator 20, time difference processor 21, digital phase-locked loop 22 and frequency multiplier 23, wherein,
the main control MCU 14 is used for controlling and setting parameters of the rubidium quantum unit 10 and working parameters of the rubidium servo circuit unit 11 so as to complete frequency locking of the rubidium atomic clock;
after the frequency locking of the rubidium atomic clock is completed, the frequency signal of the rubidium atomic clock is compared with an externally input frequency signal, and the main control MCU controls the rubidium atomic clock to adjust the frequency of the whole machine, so that the tame is completed.
In a specific example, when the rubidium atomic clock starts to work, the main control MCU 14 sets parameters of the rubidium quantum unit 10, where the parameters include setting of the temperature of the rubidium quantum unit 10, setting of working parameters of the rubidium servo circuit unit 11, and the like, and when the temperature of the rubidium quantum unit 10 is heated to a specified temperature and the setting of the working parameters of the rubidium servo circuit unit 11 is completed, the scanning circuit of the frequency starts to work, the frequency is swept, the frequency of the rubidium atomic clock is locked, that is, the frequency of the constant temperature crystal oscillator 12 is locked to the rubidium transition frequency of the rubidium quantum unit 10, and at this time, the locking of the rubidium atomic clock is completed.
In one specific example, the frequency of the constant temperature crystal oscillator 12 is 10 MHz.
In a specific example, after the rubidium atomic clock is locked, the frequency of the constant temperature crystal oscillator 12 is output as the frequency of the rubidium atomic clock, the precision does not meet the requirement, the frequency needs to be compared with an accurate frequency signal input from the outside, after the comparison, the main control MCU calculates the frequency to be adjusted, the whole machine frequency adjusting unit 13 starts to work, the frequency of the rubidium atomic clock is calibrated to be the same as the accurate frequency signal input, at this time, the frequency of the rubidium atomic clock is calibrated, and the time service can be performed after the calibration.
In the embodiment of the invention, the accurate frequency signal input from the outside can be 1PPS or 10 MHz.
In a specific example, the externally input accurate frequency signal 1PPS or 10MHz, the externally input 1PPS signal passes through the first frequency divider 15, and outputs a first frequency-divided signal 31 as an input of the first time-to-digital conversion unit 18, and the first time-to-digital conversion unit 18 converts the first frequency-divided signal into a first time to be sent to the time difference processor 21; the 10MHz signal output by the constant temperature crystal oscillator 12 enters the frequency multiplier 23 and is input to the numerically controlled oscillator 20 as the driving clock 41, the main control MCU 14 controls the numerically controlled oscillator 20 and the second frequency divider 16 to jointly output the second frequency-divided signal 32 with the same frequency as the first frequency-divided signal 31 as the input of the second time-to-digital conversion unit 19, and the second time-to-digital conversion unit 19 converts the second frequency-divided signal into the second time to be sent to the time difference processor.
If the first divider 15 input is 1PPS, the first divider division factor is 1, the numerically controlled oscillator 20 is set, making the second divided signal 32, which is also 1 Hz; if the input of the first frequency divider 15 is 10MHz, the frequency division factor of the first frequency divider is not 1, but the first frequency-divided signal 31 is set to a value as high as possible, and the numerical control is set in the same manner so that the second frequency-divided signal 32 has the same value as the first frequency-divided signal 31. After the frequency divider is set, the time difference processor is started, the time difference processor transmits the difference value of the first time and the second time to the main control MCU, the main control MCU calculates the frequency to be adjusted and transmits the frequency to the whole frequency adjusting unit 13, the whole frequency adjusting unit 13 adjusts the frequency, and the whole frequency of the rubidium atomic clock is controlled to enable the second frequency dividing signal 32 and the first frequency dividing signal 31 to be in phase synchronization, so that the tame is completed.
In another specific example, when an externally input accurate frequency signal is 10MHz, a method for quickly calibrating the rubidium atomic clock to 10MHz includes: and arranging a first frequency divider and a second frequency divider to enable the first frequency dividing signal 31 and the second frequency dividing signal 32 to have the same frequency and have the numerical values as high as possible, starting a digital phase-locked loop to lock, taking out the numerical value of the numerical control oscillator at the moment, obtaining the frequency of the rubidium atomic clock by the numerical value, adjusting the frequency of the whole rubidium atomic clock, and finishing the frequency calibration of the rubidium atomic clock. After the rubidium atomic clock frequency is calibrated, an input signal is switched to 1PPS, the first frequency divider and the second frequency divider are reset, and the time difference between the input 1PPS and the local 1PPS is measured, so that the local 1PPS output is quickly adjusted and calibrated, the two are synchronous, and the frequency correction and the time service can be quickly completed by combining the two steps.
According to the technical scheme, the time difference measurement and digital phase locking unit with the variable frequency division coefficient is additionally arranged, so that the rubidium atomic clock can accept signals of 1PPS and 10MHz, even disciplined signals of any frequency, a user is allowed to use a navigation satellite for time service, and the frequency of the rubidium atomic clock can be quickly calibrated by using advanced atomic clocks such as a cesium clock and a hydrogen clock. Meanwhile, the technical scheme of the invention can allow the user to input the frequency difference of 10MHz and the rubidium atomic clock by open-loop measurement, thereby greatly increasing the use flexibility of the user. The technical scheme of the invention has the advantages of small volume, low cost, wide adaptive frequency range and convenient integration, and all functions except the rubidium quantum unit and the constant temperature crystal oscillator can be integrated into one chip, thereby greatly enhancing the function and the usability of the rubidium atomic clock.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (6)
1. A rubidium atomic clock taming system, comprising: rubidium quantum unit, rubidium servo circuit unit, constant temperature crystal oscillator, whole machine frequency adjusting unit, main control MCU, first frequency divider, second frequency divider, third frequency divider, first time digital conversion unit, second time digital conversion unit, numerically controlled oscillator, time difference processor, digital phase-locked loop and frequency multiplier,
the master control MCU is used for controlling and setting parameters of the rubidium quantum unit and working parameters of the rubidium servo circuit unit so as to complete frequency locking of the rubidium atomic clock;
after the frequency locking of the rubidium atomic clock is completed, the frequency signal of the rubidium atomic clock is compared with an externally input frequency signal, and the main control MCU controls the rubidium atomic clock to adjust the frequency of the whole machine, so that the tame is completed.
2. The rubidium atomic clock taming system as defined in claim 1, wherein when the rubidium atomic clock starts to work, the main control MCU sets parameters of the rubidium quantum unit and working parameters of the rubidium servo circuit unit, wherein the parameters comprise the temperature of the rubidium quantum unit, when the temperature of the rubidium quantum unit is heated to a specified temperature and the working parameters of the rubidium servo circuit unit are set, the frequency scanning circuit starts to work, the frequency is swept, the frequency of the rubidium atomic clock is locked, the frequency of the constant temperature crystal oscillator is locked to the rubidium transition frequency of the rubidium quantum unit, and the locking of the rubidium atomic clock is completed.
3. The rubidium atomic clock taming system according to claim 2, wherein the frequency of the constant temperature crystal oscillator is 10 MHz.
4. The rubidium atomic clock taming system as defined in claim 2, wherein the frequency of the constant temperature crystal oscillator is output as the frequency of the rubidium atomic clock, and is compared with an externally input frequency signal, after the comparison, the main control MCU calculates the frequency to be adjusted, the whole frequency adjusting unit starts to operate, the frequency of the constant temperature crystal oscillator is calibrated to be the same as the input frequency signal, the frequency of the rubidium atomic clock is calibrated, and the time service is performed after the calibration.
5. The rubidium atomic clock taming system according to claim 4, wherein the frequency signal inputted from outside is 1PPS or 10 MHz.
6. The rubidium atomic clock taming system as claimed in claim 4, wherein the frequency signal inputted from outside is passed through a first frequency divider and a first frequency-divided signal is outputted as an input of a first time-to-digital conversion unit, which converts the frequency signal into a first time and sends the first time to the time difference processor; the frequency signal of the constant temperature crystal oscillator enters a frequency multiplier and is input to a digital controlled oscillator as a driving clock, a main control MCU controls the digital controlled oscillator and a second frequency divider to jointly output a second frequency division signal with the same frequency as the first frequency division signal as the input of a second time-to-digital conversion unit, and the second time-to-digital conversion unit converts the second frequency division signal into second time and sends the second time to a time difference processor; and the time difference processor transmits the difference value of the first time and the second time to the master control MCU, the master control MCU calculates the frequency to be adjusted and transmits the frequency to the whole frequency adjusting unit, the whole frequency adjusting unit 13 adjusts the frequency and controls the whole frequency of the rubidium atomic clock to enable the second frequency division signal and the first frequency division signal to be in phase synchronization, and therefore domestication is completed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210294086.8A CN114884507A (en) | 2022-03-24 | 2022-03-24 | Rubidium atomic clock taming system |
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| CN202210294086.8A CN114884507A (en) | 2022-03-24 | 2022-03-24 | Rubidium atomic clock taming system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115128937A (en) * | 2022-08-25 | 2022-09-30 | 中国船舶重工集团公司第七0七研究所 | Anti-deception interference rubidium atomic clock taming method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115128937A (en) * | 2022-08-25 | 2022-09-30 | 中国船舶重工集团公司第七0七研究所 | Anti-deception interference rubidium atomic clock taming method and system |
| CN115128937B (en) * | 2022-08-25 | 2022-11-04 | 中国船舶重工集团公司第七0七研究所 | Anti-deception interference rubidium atomic clock taming method and system |
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