CN202102264U - Rubidium clock taming system - Google Patents
Rubidium clock taming system Download PDFInfo
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- CN202102264U CN202102264U CN 201120217225 CN201120217225U CN202102264U CN 202102264 U CN202102264 U CN 202102264U CN 201120217225 CN201120217225 CN 201120217225 CN 201120217225 U CN201120217225 U CN 201120217225U CN 202102264 U CN202102264 U CN 202102264U
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Abstract
The utility model discloses a rubidium clock taming system, which comprises a standard signal generation module, a high-precision time interval test circuit, a center processing unit and a rubidium oscillator circuit that are connected with one another in series orderly, wherein the rubidium oscillator circuit comprises a 10 MHZ output port and a rubidium second pulse output port, and the high-precision time interval test circuit is connected with the rubidium second pulse output port. The rubidium clock taming system can timely correct a rubidium clock; when an external standard time pulse signal (1PPS) is valid, the rubidium clock taming system tames an internal rubidium atomic frequency source to acquire high frequency accuracy; when the external standard time pulse signal (1PPS) is invalid or is set by the system, the rubidium clock taming system provides high frequency holding precision so as to ensure that the system can be kept in the high-precision working state; and the precision of a final output signal can reach 1E-12.
Description
Technical field
The utility model relates to rubidium clock and tames system.
Background technology
Rubidium atomic clock is a high precision, high reliability synchronous clock product; This clock combines high stability rubidium oscillator and the time service of GPS high precision, frequency measurement and time simultaneous techniques; The rubidium oscillator output frequency is synchronized with on the gps satellite cesium-beam atomic clock signal; Having improved the long-time stability and the accuracy of frequency signal, the split-second precision frequency standard of caesium clock magnitude can be provided, is the high performance-price ratio product that department such as communication broadcasting and TV etc. substitutes caesium clocks.
And rubidium atomic frequency standard is to use rubidium isotope 87Rb atomic hyperfine energy level transition microwave absorbing spectral line working frequency benchmark, the frequency of crystal oscillator is controlled automatically, thereby obtained the standard frequency of high stability.Therefore we can make high-precision rubidium atomic clock according to rubidium atomic frequency standard.
When the application of rubidium atomic clock, usually need gps signal (or Big Dipper) to keep time, and be very normal in the instantaneous saltus step that gps signal (or Big Dipper) produces 100ns as master clock, be necessary so go to shake.
Therefore adopting gps signal (or Big Dipper) when keeping time, I need proofread rubidium clock, and its rubidium clock infinitely is near the mark the time, and the precision after the calibration is high more good more.
The utility model content
The purpose of the utility model is to solve tames processing to rubidium clock, makes rubidium clock reach higher precision, infinitely is near the mark the time simultaneously, and provides a kind of rubidium clock to tame system.
The purpose of the utility model realizes through following technical proposals: rubidium clock is tamed system; Comprise the standard signal generating module, high precision time interval test circuit, central processing unit, the rubidium oscillator circuit that are connected in series successively; Said rubidium oscillator circuit comprises 10MHZ delivery outlet and rubidium pulse per second (PPS) delivery outlet, and said high precision time interval test circuit is connected with rubidium pulse per second (PPS) delivery outlet.
The standard signal generating module is tamed system for this rubidium clock standard time pulse signal (1PPS) is provided;
The high precision time interval test circuit; The time interval of the rubidium pps pulse per second signal (rubidium 1PPS) that sends for measuring and calculating standard time pulse signal (1PPS) and rubidium pulse per second (PPS) delivery outlet; And calculate the two time difference, simultaneously the time difference signal is transferred to processing operations in the central processing unit;
The rubidium oscillator circuit; After receiving the Correction and Control signal that central processing unit sends; According to the Correction and Control signal, make correction, thereby send the rubidium pps pulse per second signal (rubidium 1PPS) of the time pulse signal that is near the mark (1PPS) after revising according to the Correction and Control signal;
Central processing unit for according to the time difference signal, sends the Correction and Control signal to the rubidium oscillator circuit after making computing.
Said central processing unit is a single-chip microcomputer.
Said standard signal generating module is standard second pulse signal generator or gps time signal generator or Big Dipper time signal generator.
The rubidium clock system of taming also comprises respectively 10MHZ lead-out terminal and the rubidium pulse per second (PPS) lead-out terminal that is connected with rubidium pulse per second (PPS) delivery outlet with the 10MHZ delivery outlet.
Said rubidium oscillator circuit also comprises constant-temperature crystal oscillator, and said constant-temperature crystal oscillator is connected with rubidium pulse per second (PPS) delivery outlet.
Also be connected with digital to analog converter between said central processing unit and the rubidium oscillator circuit.
Said digital to analog converter is 22 figure place weighted-voltage D/A converters.
The principle of work of the utility model: the high precision time interval test circuit receives from standard second pulse signal generator or gps time signal generator or Big Dipper time signal generator and sends the rubidium pulse per second (PPS) (rubidium 1PPS) that standard time pulse signal (1PPS) and rubidium pulse per second (PPS) delivery outlet send; Adopt the principle of frequency control phase place then; Be the phase place coherent of standard time pulse signal (1PPS) and rubidium pulse per second (PPS) (rubidium 1PPS), measure, calculate time difference through high precision time difference; And the accuracy value of acquisition rubidium clock output frequency; According to its numerical value the frequency trim amount is set under the control of single-chip microcomputer, i.e. Correction and Control signal, in frequency accuracy is tamed the 3E-12 scope after; Get phase pushing figure according to time difference measurement, with superfine frequency trim (1E-12 single step) control phase synchronization accuracy.Insert impulsive measurement technology (resolution: 0.5ns), therefore can obtain very high phase measurement accuracy, guarantee the needs of system synchronization precision in wherein the high precision time interval test circuit adopts.
The instantaneous saltus step that gps signal (or Big Dipper) produces 100ns is very normal; So go to shake is necessary, and native system has used standard variance for this reason, and test value is repeatedly carried out the deviation estimation; And the shake of Kalman filter smoothing processing standard signal; Realize accurate frequency deviation measurement, the frequency that the rubidium atomic oscillator circuit sends revised that its correcting mode adopts and progressively approaches through deviation.In order to overcome the intrinsic shake of GPS better, utilize the rubidium clock output frequency to hang down drift characteristic, the sample time of progressively prolong measuring, through these measure strong guarantees frequency tame precision and phase-locking precision.The problem of the phase of output signal shake when this mode overcomes the time synchronized of phase shift pattern of employing.
The beneficial effect of the utility model is: can in time revise rubidium clock; When standard time pulse signal (1PPS) is effective outside; Rubidium atomic frequency source in taming is to obtain very high frequency accuracy, outside during standard time pulse signal (1PPS) invalid (or system's setting); Provide high-precision frequency to keep precision, to guarantee that system held is in high-precision duty.The precision of final output signal can reach 1E-12.
Description of drawings
Fig. 1 is the utility model structural representation.
Fig. 2 is Karman equation formula figure.
Fig. 3 is Kalman's mathematics illustraton of model.
Fig. 4 the utility model is tamed the frequency process flow diagram.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is done further to specify, but the embodiment of the utility model is not limited only to this.
Embodiment one
As shown in Figure 1: rubidium clock is tamed system; Comprise the standard signal generating module, high precision time interval test circuit, central processing unit, the rubidium oscillator circuit that are connected in series successively; Said rubidium oscillator circuit comprises 10MHZ delivery outlet and rubidium pulse per second (PPS) delivery outlet, and said high precision time interval test circuit is connected with rubidium pulse per second (PPS) delivery outlet.
The standard signal generating module is tamed system for this rubidium clock standard time pulse signal (1PPS) is provided;
The high precision time interval test circuit; The time interval of the rubidium pps pulse per second signal (rubidium 1PPS) that sends for measuring and calculating standard time pulse signal (1PPS) and rubidium pulse per second (PPS) delivery outlet; And calculate the two time difference, simultaneously the time difference signal is transferred to processing operations in the central processing unit;
The rubidium oscillator circuit; After receiving the Correction and Control signal that central processing unit sends; According to the Correction and Control signal, make correction, thereby send the rubidium pps pulse per second signal (rubidium 1PPS) of the time pulse signal that is near the mark (1PPS) after revising according to the Correction and Control signal;
Central processing unit for according to the time difference signal, sends the Correction and Control signal to the rubidium oscillator circuit after making computing.
Said central processing unit is a single-chip microcomputer.
Said standard signal generating module is standard second pulse signal generator or gps time signal generator or Big Dipper time signal generator.
The rubidium clock system of taming also comprises respectively 10MHZ lead-out terminal and the rubidium pulse per second (PPS) lead-out terminal that is connected with rubidium pulse per second (PPS) delivery outlet with the 10MHZ delivery outlet.
Said rubidium oscillator circuit also comprises constant-temperature crystal oscillator, and said constant-temperature crystal oscillator is connected with rubidium pulse per second (PPS) delivery outlet.
Also be connected with digital to analog converter between said central processing unit and the rubidium oscillator circuit.
Said digital to analog converter is 22 figure place weighted-voltage D/A converters.Digital to analog converter transfers the digital signal in the single-chip microcomputer to simulating signal, controls the rubidium oscillator circuit with this.
The rubidium oscillator circuit is with hyperfine | 2.0>← → | 1.0 | jump frequency (6834.68750MHz) is as standard frequency, and the oscillation frequency of control constant-temperature crystal oscillator is given the user thereby make crystal oscillator export accurate, stable frequency.The output signal of 10MHz crystal oscillator is divided into two-way.One the tunnel by behind the sinusoidal wave phase modulation of the 127Hz of servo circuit output; Arrive 60MHz through six frequencys multiplication again; Another road obtains the output signal of 5.3125MHz frequently through frequency synthesizer, two paths of signals addition on frequency multiplication is comprehensive, and then deliver on the step-recovery diode (SRD) in the resonator cavity; The 60MHz signal is carried out the signal that 114 frequencys multiplication get 6840MHz; Behind the signal subtraction of this signal and 5.317460MHz, obtain the signal of 6834.6875MHz, get into resonator cavity group and encourage the atomic transition on the rubidium atomic ground state 0-0 energy level.Frequency and 87Rb atom when the microwave excitation signal | 2.0>← → | 1.0 | when jump frequency does not conform to; Then resonator has error signal output; Error signal is through servo circuit amplifies, filtering, demodulation obtain a direct current control voltage; And feed back to crystal oscillator and carry out Automatic Frequency fine setting, make the frequency of crystal oscillator output equally accurate, stable with the atomic transition frequency on rubidium atomic ground state 0-0 energy level.The output signal of crystal oscillator is delivered to amplifier and is divided into 10MHz sinusoidal signal supply user.The 10MHz sinusoidal signal is through the output of 10MHZ delivery outlet.
Rubidium pulse per second (PPS) (rubidium 1PPS) part that the rubidium oscillator circuit produces is exported to the user; A part is transferred to the high precision time interval test circuit; After through the high precision time interval test circuit rubidium pulse per second (PPS) (rubidium 1PPS) and standard time pulse signal (1PPS) being done comparison and calculating; The output time difference signal is transferred to the single-chip microcomputer computing; Single-chip microcomputer output Correction and Control signal with this rubidium pulse per second (PPS) (rubidium 1PPS) of controlling its output of rubidium oscillator circuit modifications, finally reaches rubidium pulse per second (PPS) (rubidium 1PPS) time pulse signal that is near the mark (1PPS).
Wherein, in the high precision time interval test circuit, analysis of measurement errors is adopted following principle:
ΔTδ＝G
δ+S
R
Wherein: G
δ--GPS signal jitter second stochastic error, G
δUncertainty be: ± 80ns; S
R---Rb signal drift second systematic error;
The confidence level of time difference measurement true value:
ΔT/T＝（ΔT2-ΔT1）/t?＝?（G
δ+S
R2-S
R1）/t
Can know The measuring precision and G according to following formula
δRelevant with the sample interval;
Suppose: G
δUncertainty be: ± 80ns;
So, obtain the measuring accuracy of 1E-12, its time interval: t=80*1E-12=80000 ≈ second 1 day;
As shown in Figure 2: as, to have only the G of improvement in order to improve measuring accuracy
δPerformance, the best way Kalman algorithm.
Kalman's algorithm:
Model equation: ?
: where
is the system noise
:
is observation noise
⑴ calculation of filtered initial value:
: initial covariance
Wherein, filtering is calculated shown in Fig. 3 Kalman mathematics model:
Wherein: be initial observation noise, along with the carrying out of filtering, observation noise is an adaptation value later on.See the filtering calculation process of figure two.
。Q is a system noise; This value can be according to repetition test; Confirm this value; This value is constant basically, gets
here.0 <b < 1 is forgetting factor; Generally get 0.95-0.99; Here
that get in scheming above the b=0.95. is the observation sequence value, here just is a second difference.
Digital filtering through the Kalman is handled, and will make G
δGood improvement is arranged, the satisfied ± 25ns that obtains us.
Can know the required time of frequency measurement accuracy of 1E-12 by following formula: 25000 seconds.
Frequency in the utility model is tamed flow process:
According to Kalman filtering put letter district, measuring accuracy, be provided with 3 frequencies and tame process:
1. time difference measurement Rb produces second:
At standard time pulse signal (1PPS) but effectively and carry out synch command, system will produce hysterisis criterion about 2000uS test second second, its objective is the accuracy of assurance pulse strenching and overcome nonlinearity erron.
2. initialization frequency is tamed, and is as shown in Figure 4:
When the time interval is 200 seconds, and algorithm is following:
Δ F/F=(T2-T1)/200 (e-9 of unit)
If: Δ F/F >=5E-10 carries out the frequency correction, and SF=-250 is set, and returns time difference measurement Rb and produces second;
Δ F/F≤5E-10, with regard to proceeding measurement:
Δ F/F=(T3-T1)/400 (e-9 of unit)
If: Δ F/F>=3E-10 carries out the frequency correction, and SF=-150 is set, and returns time difference measurement Rb and produces second; Δ F/F≤3E-10, with regard to proceeding measurement:
Δ F/F=(T4-T1)/600 (e-9 of unit)
If: Δ F/F>=2E-10 carries out the frequency correction, and SF=-100 is set, and returns time difference measurement Rb and produces second; Δ F/F≤2E-10, with regard to proceeding measurement:
Δ F/F=(T4-T1)/800 (e-9 of unit)
If: Δ F/F>=1E-10 carries out the frequency correction, and SF=-50 is set, and returns time difference measurement Rb and produces second; Δ F/F≤1E-10, with regard to proceeding measurement:
Δ F/F=(T5-T1)/1000 (e-9 of unit)
If: Δ F/F>=1E-10 carries out the frequency correction, and SF=-50 is set, and returns time difference measurement Rb and produces second; Δ F/F≤1E-10 is with regard to proceeding measurement (precision measure in the entering)
3. signal Synchronization:
Signal Synchronization; System adopts phase shift phase-locking technology; To measure needed rubidium pps pulse per second signal of the time difference (rubidium 1PPS) and separate, so directly phase shift phase-locking and do not influence the measurement mechanism of system with output rubidium pps pulse per second signal (rubidium 1PPS) is good.
Take aforesaid way, just can realize the utility model preferably.
Claims (7)
1. rubidium clock is tamed system; It is characterized in that: comprise the standard signal generating module, high precision time interval test circuit, central processing unit, the rubidium oscillator circuit that are connected in series successively; Said rubidium oscillator circuit comprises 10MHZ delivery outlet and rubidium pulse per second (PPS) delivery outlet, and said high precision time interval test circuit is connected with rubidium pulse per second (PPS) delivery outlet.
2. rubidium clock according to claim 1 is tamed system, it is characterized in that: said central processing unit is a single-chip microcomputer.
3. rubidium clock according to claim 1 is tamed system, it is characterized in that: said standard signal generating module is standard second pulse signal generator or gps time signal generator or Big Dipper time signal generator.
4. rubidium clock according to claim 1 is tamed system, it is characterized in that: also comprise respectively the 10MHZ lead-out terminal and the rubidium pulse per second (PPS) lead-out terminal that are connected with rubidium pulse per second (PPS) delivery outlet with the 10MHZ delivery outlet.
5. rubidium clock according to claim 1 is tamed system, it is characterized in that: said rubidium oscillator circuit also comprises constant-temperature crystal oscillator, and said constant-temperature crystal oscillator is connected with rubidium pulse per second (PPS) delivery outlet.
6. tame system according to any described rubidium clock among the claim 1-5, it is characterized in that: also be connected with digital to analog converter between said central processing unit and the rubidium oscillator circuit.
7. rubidium clock according to claim 5 is tamed system, it is characterized in that: said digital to analog converter is 22 figure place weighted-voltage D/A converters.
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| CN 201120217225 CN202102264U (en) | 2011-06-24 | 2011-06-24 | Rubidium clock taming system |
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| CN 201120217225 CN202102264U (en) | 2011-06-24 | 2011-06-24 | Rubidium clock taming system |
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| CN102759882A (en) * | 2012-07-13 | 2012-10-31 | 西安交通大学 | Time synchronizing device based on pulsar |
| CN102759685A (en) * | 2012-07-18 | 2012-10-31 | 上海晟东电力科技有限公司 | Self-punctual clock circuit for intelligent test terminal of distribution network |
| CN103324080A (en) * | 2012-03-19 | 2013-09-25 | 北京泛华恒兴科技有限公司 | Satellite disciplined rubidium clock card |
| CN104020489A (en) * | 2014-06-18 | 2014-09-03 | 中国海洋石油总公司 | Comprehensive control method and device for achieving offshore geophysical exploration |
| CN104199274A (en) * | 2014-09-24 | 2014-12-10 | 北京市计量检测科学研究院 | Pre-estimating method for frequency modification value of rubidium clock |
| CN104199061A (en) * | 2014-08-22 | 2014-12-10 | 北京无线电计量测试研究所 | Method for establishing carrier phase frequency standard of GPS (global position system) and BDS (BeiDou Navigation Satellite system) |
| CN105610440A (en) * | 2015-12-17 | 2016-05-25 | 北京无线电计量测试研究所 | Method and device for adjusting CPT atomic frequency standard |
| CN106154822A (en) * | 2015-03-27 | 2016-11-23 | 北京机电工程研究所 | The method for synchronizing time of satellite locking rubidium atomic clock and localizer station |
| JP2016213608A (en) * | 2015-05-01 | 2016-12-15 | 株式会社リコー | Atomic oscillator and control method of atomic oscillator |
| CN107193207A (en) * | 2017-07-28 | 2017-09-22 | 中国电子科技集团公司第五十四研究所 | A kind of multi-mode rubidium clock calibrating installation for scatter communication |
| CN107367925A (en) * | 2017-09-19 | 2017-11-21 | 电信科学技术第五研究所有限公司 | A kind of multichannel rubidium clock automatic checkout system and method |
| CN109508510A (en) * | 2018-12-20 | 2019-03-22 | 国网河南省电力公司焦作供电公司 | A kind of rubidium atomic clock parameter estimation algorithm based on improved Kalman filtering |
| CN111399366A (en) * | 2020-03-30 | 2020-07-10 | 中国电子科技集团公司第五十四研究所 | Multi-clock comprehensive time keeping method and multi-rubidium clock time keeping device |
| CN114647178A (en) * | 2022-03-23 | 2022-06-21 | 中国人民解放军93216部队 | Automatic atomic clock calibration method and system based on Beidou and ground reference transmission |
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2011
- 2011-06-24 CN CN 201120217225 patent/CN202102264U/en not_active Expired - Fee Related
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| CN103324080A (en) * | 2012-03-19 | 2013-09-25 | 北京泛华恒兴科技有限公司 | Satellite disciplined rubidium clock card |
| CN103324080B (en) * | 2012-03-19 | 2016-03-30 | 北京泛华恒兴科技有限公司 | Satellite Tame Rubidium Clock card |
| CN102759882A (en) * | 2012-07-13 | 2012-10-31 | 西安交通大学 | Time synchronizing device based on pulsar |
| CN102759685A (en) * | 2012-07-18 | 2012-10-31 | 上海晟东电力科技有限公司 | Self-punctual clock circuit for intelligent test terminal of distribution network |
| CN104020489B (en) * | 2014-06-18 | 2017-01-18 | 中国海洋石油总公司 | Comprehensive control method and device for achieving offshore geophysical exploration |
| CN104020489A (en) * | 2014-06-18 | 2014-09-03 | 中国海洋石油总公司 | Comprehensive control method and device for achieving offshore geophysical exploration |
| CN104199061A (en) * | 2014-08-22 | 2014-12-10 | 北京无线电计量测试研究所 | Method for establishing carrier phase frequency standard of GPS (global position system) and BDS (BeiDou Navigation Satellite system) |
| CN104199061B (en) * | 2014-08-22 | 2018-02-02 | 北京无线电计量测试研究所 | A kind of method for establishing GPS system and BDS system carrier phase frequency standards |
| CN104199274A (en) * | 2014-09-24 | 2014-12-10 | 北京市计量检测科学研究院 | Pre-estimating method for frequency modification value of rubidium clock |
| CN106154822A (en) * | 2015-03-27 | 2016-11-23 | 北京机电工程研究所 | The method for synchronizing time of satellite locking rubidium atomic clock and localizer station |
| JP2016213608A (en) * | 2015-05-01 | 2016-12-15 | 株式会社リコー | Atomic oscillator and control method of atomic oscillator |
| CN105610440A (en) * | 2015-12-17 | 2016-05-25 | 北京无线电计量测试研究所 | Method and device for adjusting CPT atomic frequency standard |
| CN107193207A (en) * | 2017-07-28 | 2017-09-22 | 中国电子科技集团公司第五十四研究所 | A kind of multi-mode rubidium clock calibrating installation for scatter communication |
| CN107367925A (en) * | 2017-09-19 | 2017-11-21 | 电信科学技术第五研究所有限公司 | A kind of multichannel rubidium clock automatic checkout system and method |
| CN109508510A (en) * | 2018-12-20 | 2019-03-22 | 国网河南省电力公司焦作供电公司 | A kind of rubidium atomic clock parameter estimation algorithm based on improved Kalman filtering |
| CN109508510B (en) * | 2018-12-20 | 2022-10-28 | 国网河南省电力公司焦作供电公司 | Improved Kalman filtering-based rubidium atomic clock parameter estimation algorithm |
| CN111399366A (en) * | 2020-03-30 | 2020-07-10 | 中国电子科技集团公司第五十四研究所 | Multi-clock comprehensive time keeping method and multi-rubidium clock time keeping device |
| CN111399366B (en) * | 2020-03-30 | 2021-06-22 | 中国电子科技集团公司第五十四研究所 | Multi-clock comprehensive time keeping method and multi-rubidium clock time keeping device |
| CN114647178A (en) * | 2022-03-23 | 2022-06-21 | 中国人民解放军93216部队 | Automatic atomic clock calibration method and system based on Beidou and ground reference transmission |
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Denomination of utility model: Rubidium clock taming system Effective date of registration: 20130821 Granted publication date: 20120104 Pledgee: Chengdu high investment financing Company limited by guarantee Pledgor: CHENGDU COVE TECHNOLOGY CO., LTD. Registration number: 2013990000599 |
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Date of cancellation: 20160914 Granted publication date: 20120104 Pledgee: Chengdu high investment financing Company limited by guarantee Pledgor: CHENGDU COVE TECHNOLOGY CO., LTD. Registration number: 2013990000599 |
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Address after: The middle Tianfu Avenue in Chengdu city Sichuan province 610000 No. 1366 2 4 storey building 1-3 No. Patentee after: Chengdu for Polytron Technologies Inc Address before: Tianfu Avenue high-tech incubator park of Chengdu high tech Development Zone in Sichuan province 610000 5-1-12 Patentee before: CHENGDU COVE TECHNOLOGY CO., LTD. |
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