CN106773614A - It is applied to the precision time interval measurement method and device of optical fiber time transmission - Google Patents
It is applied to the precision time interval measurement method and device of optical fiber time transmission Download PDFInfo
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- CN106773614A CN106773614A CN201611081903.2A CN201611081903A CN106773614A CN 106773614 A CN106773614 A CN 106773614A CN 201611081903 A CN201611081903 A CN 201611081903A CN 106773614 A CN106773614 A CN 106773614A
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- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F10/00—Apparatus for measuring unknown time intervals by electric means
- G04F10/04—Apparatus for measuring unknown time intervals by electric means by counting pulses or half-cycles of an ac
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Abstract
The invention discloses a kind of precision time interval measurement method and device for being applied to optical fiber time transmission, it uses bigness scale of the method completion of pulse stuff to tested time interval；The method for carrying out phase demodulation using local oscillation frequency signal and the carrier frequency signaling for recovering completes the thin survey to the tested time interval；Arithmetic element combines the bigness scale and the thin result surveyed, and the accurate results to the time interval are obtained after update the system error.The present invention is applied to optical fiber time transmits, and the time signal transmitted and frequency signal are homologous situations.Time interval measurement precision of the invention can reach 3ps.Compared with existing time interval measurement method, the present invention has certainty of measurement high, the characteristics of low cost.
Description
Technical field
The invention belongs to Time synchronization technique field, it is related to precision time interval measurement method, especially a kind of application
In the precision time interval measurement method and device of optical fiber time transmission.
Background technology
In many method for synchronizing time, the method for optical fiber time transmission can reach synchronization accuracy higher, and
Equipment price is far below satellite two-way pumping station method, so optical fiber time transmission method has broad application prospects.Realize high-precision
The optical fiber time transmission of degree, first having to the propagation delay time to time signal in a fiber carries out accurate measurement, then according to measurement
Result time signal is controlled exactly, so as to reach high-precision synchronization.The synchronous essence of restriction optical fiber time transmission
One key factor of degree is measurement to time signal propagation delay time, that is, time interval measurement.
At present, the method that time interval measurement is used in optical fiber time transmission is a lot, and conventional has TDC chip methods, FPGA
Method, time interval measurement agent approach, universal counter method etc..But all some are not enough in optical fiber time transmission for these methods.
Using TDC chip methods, although low cost, small volume, but its measurement range is small, about hundreds of ns~be difficult to meet length to several ms
Distance is used, and certainty of measurement can only arrive 22ps；Using FPGA methods, low cost, small volume measurement range are big, but measurement essence
Degree is low to can only achieve hundreds of ps；Using time interval measurement agent approach, such as U1050A of Agilent, although high precision reaches 5ps,
But cost use universal counter method too high, such as SR620 and Agilent 53230, its certainty of measurement can reach 20ps, measurement
Scope also can be very big, but the big high cost of volume, be not suitable for being used in optical fiber time transmission equipment.
The present invention proposes a kind of precision time interval measurement method for being applied to optical fiber time transmission, and it is applied to light
In fine Time Transmission, and the time signal transmitted and frequency signal are homologous situations.When the present invention takes into full account optical fiber
Between transmission system the characteristics of, using the correlation of transmittance process frequency signal and time signal, using pulse stuff bigness scale and frequency
Rate signal phase demodulation carefully surveys the method for wanting to combine, and realizes high precision time interval measurement, and certainty of measurement is up to 3ps, measurement range
Reachable ± 10000s, and low cost is easily integrated, and is highly suitable for being applied in optical fiber time transmission equipment.
The content of the invention
A kind of shortcoming it is an object of the invention to overcome above-mentioned prior art, there is provided height for being applied to optical fiber time transmission
Precision Time interval measurement method and device, the characteristics of it takes into full account optical fiber time transmission system, using transmittance process frequency
Signal and the correlation of time signal, the method for wanting to combine carefully is surveyed using pulse stuff bigness scale and frequency signal phase demodulation, is realized
High precision time interval measurement, and low cost is easily integrated.
The purpose of the present invention is achieved through the following technical solutions：
Present invention firstly provides a kind of precision time interval measurement method for being applied to optical fiber time transmission, using pulse
The method of filling completes the bigness scale to being tested time interval；Carried out with the carrier frequency signaling for recovering using local oscillation frequency signal
The method of phase demodulation completes the thin survey to the tested time interval；Arithmetic element combination bigness scale and the thin result surveyed, update the system
The accurate results to time interval are obtained after error.
The present invention also proposes a kind of to realize the above-mentioned precision time interval measurement method for being applied to optical fiber time transmission
Time interval measurement device：Including photodetector, the input connection optical fiber of the photodetector, photodetector it is defeated
Go out end and be connected with carrier auxiliary device all the way, another road is connected with decoder；The output of the carrier auxiliary device connects linear mirror
Phase device, the output of the linear phase detector is connected with converter；The output end of the decoder is connected with pulse stuff measurement
Device, the output end of the pulse stuff measuring appliance is connected with the input of arithmetic element, the input of the arithmetic element also with
The output end connection of converter；The output end of the arithmetic element is exported as time interval measurement result；The pulse is filled out
The input for filling measuring appliance is also associated with N frequency multipliers, and the N frequency multipliers and linear phase detector have been input into same reference frequency letter
Number.
Further, the course of work of apparatus described above specifically includes following steps：
1) optical signal from optical fiber is converted to electric signal by photodetector；
2) by step 1) described in electric signal be divided into two-way, wherein be input to decoder all the way being decoded, obtain the time
Signal；It is input to carrier auxiliary device all the way in addition, the carrier auxiliary device recovers the frequency letter related to the time signal
Number；
3) reference frequency signal is divided into two-way, and the first via is input in N frequency multipliers, N times of reference frequency signal of generation
Signal, N is positive integer, the second tunnel and step 2 herein) in be input in linear phase detector together with the frequency signal that recovers；
4) reference time signal and step 2) described in the time signal that obtains of decoder together be input to pulse stuff survey
In measuring device；Step 3) the N times of reference frequency signal signal, as filling clock signal also enter into pulse stuff measure
In device, measure reference time signal and step 2) described in the bigness scale result of the time interval of time signal that obtains of decoder；
5) by step 3) the phase information of linear phase detector output the numerical value of phase difference is converted to by converter；
6) arithmetic element is according to step 5) numerical computations of phase difference that obtain go out reference time signal and step 2) described
The thin survey result of the time interval of time signal that obtains of decoder；
7) arithmetic element is according to step 4) the bigness scale result, the step 6 that obtain) the thin survey result that obtains, and systematic error,
Calculate accurate time interval measurement result.
Further, above step 3) in, N is the positive integer more than 3.
Further, above-mentioned N frequency multipliers are 4 frequency multipliers.
The invention has the advantages that：
The present invention completes the bigness scale to being tested time interval using the method for pulse stuff；Using local oscillation frequency signal with it is extensive
The carrier frequency signaling appeared again carries out thin survey of the method completion of phase demodulation to the tested time interval；Arithmetic element combines described
Bigness scale and the thin result surveyed, obtain the accurate results to the time interval after update the system error.The present invention is applied to
In optical fiber time transmission, and the time signal transmitted and frequency signal are homologous situations.The present invention is in pulse stuff
Method is completed to being tested on the basis of the bigness scale of time interval, using the correlation of frequency signal and time signal, using local oscillator
The method that frequency signal carries out phase demodulation with the carrier frequency signaling for recovering completes the thin survey to the tested time interval, greatly
The big resolution ratio that improve time interval measurement, then the amendment by arithmetic element to systematic error, have finally given accurate
Measurement result.The precision of current time interval measurement is general to be difficult to better than 20ps, and time interval measurement precision of the invention can
To reach 3ps.Compared with existing time interval measurement method, the present invention has certainty of measurement high, the characteristics of low cost.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of intervalometer of the present invention；
Fig. 2 is optical fiber time transfer device figure.
Specific embodiment
Present invention firstly provides a kind of precision time interval measurement method for being applied to optical fiber time transmission：The method is adopted
The bigness scale to being tested time interval is completed with the method for pulse stuff；Believed with the carrier frequency for recovering using local oscillation frequency signal
Number carry out the thin survey that the method for phase demodulation completes to the tested time interval；Arithmetic element combination bigness scale and the thin result surveyed, repair
The accurate results to time interval are obtained after positive system error.
In order to realize above method, the present invention proposes a kind of time interval measurement device, as shown in Figure 1：Including light electrical resistivity survey
Device is surveyed, the input connection optical fiber of the photodetector, the output end of photodetector is connected with carrier auxiliary device all the way, separately
Decoder is connected with all the way；The output of the carrier auxiliary device is connected with linear phase detector, and the output of the linear phase detector connects
It is connected to converter；The output end of the decoder is connected with pulse stuff measuring appliance, the output of the pulse stuff measuring appliance
End is connected with the input of arithmetic element, and the input of the arithmetic element is also connected with the output end of converter；The fortune
The output end for calculating unit is exported as time interval measurement result；The input of the pulse stuff measuring appliance is also associated with N times
Frequency device, the N frequency multipliers and linear phase detector have been input into same reference frequency signal.The course of work of the device is specifically included
Following steps：
1) optical signal from optical fiber is converted to electric signal by photodetector；
2) by step 1) described in electric signal be divided into two-way, wherein be input to decoder all the way being decoded, obtain the time
Signal；It is input to carrier auxiliary device all the way in addition, the carrier auxiliary device recovers the frequency letter related to the time signal
Number；
3) reference frequency signal is divided into two-way, and the first via is input in N frequency multipliers, N times of reference frequency signal of generation
Signal, N is positive integer, the second tunnel and step 2 herein) in be input in linear phase detector together with the frequency signal that recovers；
4) reference time signal and step 2) described in the time signal that obtains of decoder together be input to pulse stuff survey
In measuring device；Step 3) the N times of reference frequency signal signal, as filling clock signal also enter into pulse stuff measure
In device, measure reference time signal and step 2) described in the bigness scale result of the time interval of time signal that obtains of decoder；
5) by step 3) the phase information of linear phase detector output the numerical value of phase difference is converted to by converter；
6) arithmetic element is according to step 5) numerical computations of phase difference that obtain go out reference time signal and step 2) described
The thin survey result of the time interval of time signal that obtains of decoder；
7) arithmetic element is according to step 4) the bigness scale result, the step 6 that obtain) the thin survey result that obtains, and systematic error,
Calculate accurate time interval measurement result.
The present invention is described in further detail with reference to the accompanying drawings and examples：
Referring to Fig. 1：It is assumed that the reference time signal of source cell site is 1PPS (one pulse per second) signal,
Frequency signal is 10MHz signals.Specific technical scheme is realized as follows：
1st, the optical signal from optical fiber is converted to electric signal by photodetector.
2nd, the electric signal described in step 1 is divided into two-way, wherein be input to decoder all the way being decoded, obtains the 1PPS times
Signal；Carrier auxiliary device is input to all the way in addition, and the carrier auxiliary device recovers related to the 1PPS time signals
10MHz frequency signals.
3rd, it is two-way with reference to 10MHz points, the first via is input in 4 frequency multipliers, produces 40MHz frequency signals；Second tunnel with
The 10MHz frequency signals for recovering described in step 2 are input in linear phase detector together.
4th, pulse is input to together with the 1PPS time signals that the decoder with reference to 1PPS time signals described in step 2 is obtained
In filling measuring appliance.40Mz frequency signals described in step 3, in also entering into pulse stuff measuring appliance as filling clock signal,
Measure the bigness scale knot of the time interval of the 1PPS time signals that the decoder with reference to described in 1PPS time signals and step 2 is obtained
Really.
5th, linear phase detector described in step 3, the phase information of its output is by converter (analog-digital converter)
Be converted to the numerical value of phase difference.
6th, the numerical computations of the phase difference that arithmetic element is obtained according to step 5 go out to refer to 1PPS time signals and step 2 institute
The thin survey result of the time interval of the 1PPS time signals that the decoder stated is obtained.
7th, the thin survey result that arithmetic element is obtained according to step 4 bigness scale result, step 6 are obtained, and systematic error, meter
Calculate accurate time interval measurement result.
Fig. 2 is optical fiber time transfer device figure, another embodiment job step of optical fiber time transfer device of the invention
It is as follows：
1st, with reference to 10MHz signals, the time interval measurement number of results exported with reference to 1PPS signals and intervalometer
According to being input to encoder together；
2nd, step 1 encoder output signal as laser modulated signal；
3rd, the optical signal of the laser output of step 2 is input to optical fiber link by circulator 1, and defeated by circulator 2
Go out；
4th, the optical signal of the output of circulator 2 is divided into two-way, wherein being input to photodetector 2 all the way is converted to electric signal,
Another road is input to EDFA (fiber amplifier)；
5th, the optical signal of the EDFA outputs of step 4 is input to optical fiber link by circulator 2, and is reached by circulator 1
Photodetector 1 is converted to electric signal；
6th, it is the photodetector 1 of step 5 is changed out electric signal, with reference to 10MHz signals and defeated together with reference to 1PPS signals
Enter in intervalometer, obtain time interval measurement result data；
7th, the electric signal that the photodetector 2 of step 4 is changed out is input to time delay compensator, and time delay compensator is defeated
Go out 1PPS signals.1PPS signals herein are achieved that synchronous with reference 1PPS signals.
In sum, the present invention completes the bigness scale to being tested time interval using the method for pulse stuff；Using local oscillator frequently
The method that rate signal carries out phase demodulation with the carrier frequency signaling for recovering completes the thin survey to the tested time interval；Computing list
Unit combines the bigness scale and the thin result surveyed, and the accurate results to the time interval are obtained after update the system error.This
Invention is applied to optical fiber time transmits, and the time signal transmitted and frequency signal are homologous situations.The present invention exists
The method of pulse stuff is completed to being tested on the basis of the bigness scale of time interval, related to time signal using frequency signal
Property, the method for carrying out phase demodulation using local oscillation frequency signal and the carrier frequency signaling for recovering is completed between the tested time
Every thin survey, substantially increase the resolution ratio of time interval measurement, then the amendment by arithmetic element to systematic error, it is final
Accurate measurement result is arrived.The precision of current time interval measurement is general to be difficult to better than 20ps, and time interval of the invention
Certainty of measurement can reach 3ps.Compared with existing time interval measurement method, the present invention has certainty of measurement high, low cost
The characteristics of.
Claims (5)
1. it is a kind of to be applied to the precision time interval measurement method that optical fiber time is transmitted, it is characterised in that to use pulse stuff
Method complete to be tested time interval bigness scale；Phase demodulation is carried out with the carrier frequency signaling for recovering using local oscillation frequency signal
Method complete thin survey to the tested time interval；Arithmetic element combination bigness scale and the thin result surveyed, update the system error
The accurate results to time interval are obtained afterwards.
2. between a kind of time of the precision time interval measurement method for realizing being applied to optical fiber time transmission described in claim 1
Every measurement apparatus, it is characterised in that including photodetector, the input connection optical fiber of the photodetector, photodetection
The output end of device is connected with carrier auxiliary device all the way, and another road is connected with decoder；The output of the carrier auxiliary device is connected with
Linear phase detector, the output of the linear phase detector is connected with converter；The output end of the decoder is connected with pulse and fills out
Measuring appliance is filled, the output end of the pulse stuff measuring appliance is connected with the input of arithmetic element, the input of the arithmetic element
End is also connected with the output end of converter；The output end of the arithmetic element is exported as time interval measurement result；It is described
The input of pulse stuff measuring appliance is also associated with N frequency multipliers, and the N frequency multipliers and linear phase detector have been input into same reference
Frequency signal.
3. time interval measurement device according to claim 2, it is characterised in that the course of work of described device is specifically wrapped
Include following steps：
1) optical signal from optical fiber is converted to electric signal by photodetector；
2) by step 1) described in electric signal be divided into two-way, wherein be input to decoder all the way being decoded, obtain time signal；
Carrier auxiliary device is input to all the way in addition, and the carrier auxiliary device recovers the frequency signal related to the time signal；
3) reference frequency signal is divided into two-way, and the first via is input in N frequency multipliers, produces the N times of signal of reference frequency signal,
N is positive integer, the second tunnel and step 2 herein) in be input in linear phase detector together with the frequency signal that recovers；
4) reference time signal and step 2) described in the time signal that obtains of decoder together be input to pulse stuff measuring appliance
In；Step 3) the N times of reference frequency signal signal, as filling clock signal also enter into pulse stuff measuring appliance
In, measure reference time signal and step 2) described in the bigness scale result of the time interval of time signal that obtains of decoder；
5) by step 3) the phase information of linear phase detector output the numerical value of phase difference is converted to by converter；
6) arithmetic element is according to step 5) numerical computations of phase difference that obtain go out reference time signal and step 2) described in solution
The thin survey result of the time interval of the time signal that code device is obtained；
7) arithmetic element is according to step 4) the bigness scale result, the step 6 that obtain) the thin survey result that obtains, and systematic error, calculate
Go out accurate time interval measurement result.
4. time interval measurement device according to claim 3, it is characterised in that step 3) in, N is just whole more than 3
Number.
5. time interval measurement device according to claim 3, it is characterised in that the N frequency multipliers are 4 frequency multipliers.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109274424A (en) * | 2018-10-30 | 2019-01-25 | 中国科学院国家授时中心 | A kind of automatic compensating method of optical fiber time dissemination system and its sagnac effect |
| CN113810108A (en) * | 2021-09-14 | 2021-12-17 | 中国科学院国家授时中心 | Double-layer locking time signal purification method and system for optical fiber time transmission |
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| CN2736821Y (en) * | 2004-05-18 | 2005-10-26 | 西安电子科技大学 | Programmable logic device based short time interval meter |
| CN101320060A (en) * | 2008-07-18 | 2008-12-10 | 北京航大智慧科技有限公司 | Fast phase meter |
| US20110074514A1 (en) * | 2009-09-28 | 2011-03-31 | Fujitsu Semiconductor Limited | Frequency measurement circuit and pll synthesizer provided therewith |
| CN102323739A (en) * | 2011-09-20 | 2012-01-18 | 郑州轻工业学院 | Multilevel time measurement and control method in synchronous clock technology |
| CN102508024A (en) * | 2011-09-20 | 2012-06-20 | 郑州轻工业学院 | Frequency and phase difference precision measurement method based on frequency and phase relationship auxiliary processing |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2736821Y (en) * | 2004-05-18 | 2005-10-26 | 西安电子科技大学 | Programmable logic device based short time interval meter |
| CN101320060A (en) * | 2008-07-18 | 2008-12-10 | 北京航大智慧科技有限公司 | Fast phase meter |
| US20110074514A1 (en) * | 2009-09-28 | 2011-03-31 | Fujitsu Semiconductor Limited | Frequency measurement circuit and pll synthesizer provided therewith |
| CN102323739A (en) * | 2011-09-20 | 2012-01-18 | 郑州轻工业学院 | Multilevel time measurement and control method in synchronous clock technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109274424A (en) * | 2018-10-30 | 2019-01-25 | 中国科学院国家授时中心 | A kind of automatic compensating method of optical fiber time dissemination system and its sagnac effect |
| CN113810108A (en) * | 2021-09-14 | 2021-12-17 | 中国科学院国家授时中心 | Double-layer locking time signal purification method and system for optical fiber time transmission |
| CN113810108B (en) * | 2021-09-14 | 2022-07-26 | 中国科学院国家授时中心 | Double-layer locking time signal purification method and system for optical fiber time transmission |
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