CN102546072A - Regenerative UTC (Universal Time Coordinated) atomic time ultrahigh precision time frequency synchronization network - Google Patents
Regenerative UTC (Universal Time Coordinated) atomic time ultrahigh precision time frequency synchronization network Download PDFInfo
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Abstract
The invention discloses a regenerative UTC (Universal Time Coordinated) atomic time ultrahigh precision time frequency synchronization network. The regenerative UTC atomic time ultrahigh precision time frequency synchronization network is connected with a time synchronization master station and a time synchronization slave station through optical fibers. An interprovincial and interurban primary communication network is established and borne on an optical-cable optical transport network. HTF-BITS equipment is respectively arranged on the time synchronization master station and the time synchronization slave station. A caesium clock Cs, a rubidium clock Rb, a DCXO (Digital Control X-tal Crystal Oscillator) or a VCXO (Voltage Control X-tal Crystal Oscillator) is arranged on each piece of HTF-BITS equipment. The ultrahigh precision time frequency synchronization or mutual synchronization between the caesium clocks is completed; or the master-slave synchronization between the caesium clocks and the rubidium clocks is completed; the mutual synchronization between the caesium clocks is completed; the master-slave synchronization between the rubidium clocks and the DCXOs is completed; the mutual synchronization between the DCXOs is completed; the master-slave synchronization between the DCXOs and the VCXOs is completed; and as long as the synchronization network normally operates, any node can be a regenerative UTC atomic time frequency standard. The invention provides the novel all-round underground high-precision time frequency synchronization network which is used for transmitting the high-precision time reference by an underground optical-cable optical transmission system without depending on sky time established by navigation systems such as a GPS (Global Positioning System), the Beidou and the like.
Description
Technical field
The invention belongs to UTC simultaneous techniques field, relate to a kind of temporal frequency Synchronization Network, especially a kind of regeneration UTC atomic time superhigh precision temporal frequency Synchronization Network.
Background technology
By the Big Dipper, GPS, GLONASS ... Sky temporal frequency synchronous base Synchronization Network etc. satellite navigation system foundation; Its advantage is in any place of the earth, any time anyone or transducer all can obtain and the UTC comparison differs 300ns or littler time reference, provides＜services such as frequency reference of 1E-11/ days.
But the safe and reliable inevitable existing problems of aerial Time and Frequency Synchronization net, at first space/aerial abominable nature and weather factor affecting satellite positioning navigation time service precision; Another one important safety factor be the availability of satellite navigation system be limited by fully system have state and easily the ground receiving system that makes under attack can't receive in-flight time frequency reference reference signal.
The sky time that Synchronization Network of the present invention does not rely on satellite navigation systems such as GPS, the Big Dipper to set up; And transmit the split-second precision benchmark with the subterranean cable optical transmission system, the new time Frequency Synchronization net that forms the high accuracy " unified fusion " of underground (the comprising ground) of extending in all direction is that the safety, the electromagnetic pulse-resisting that are related to national security, national various communications network security, national defence communication network, power telecom network disturb, anti-damage etc. has far-reaching strategic importance.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art; A kind of regeneration UTC atomic time superhigh precision temporal frequency Synchronization Network is provided; This Synchronization Network is the sky time that a kind of usefulness does not rely on satellite navigation systems such as GPS, the Big Dipper to set up; And transmit the split-second precision benchmark with the subterranean cable optical transmission system, form the new time Frequency Synchronization net of the high accuracy " unified fusion " of underground (the comprising ground) of extending in all direction.
The objective of the invention is to solve through following technical scheme:
This regeneration UTC atomic time superhigh precision temporal frequency Synchronization Network; Said Synchronization Network interconnects time synchronized main website and time synchronized slave station through optical fiber; It is characterized in that: the one-level communication network of setting up and be carried on Trans-Provincial/Municipal on the optical fiber cables transmission network; HTF-BITS equipment is set respectively on main website and slave station, and said HTF-BITS equipment is provided with caesium clock Cs, rubidium clock Rb, DCXO or VCXO, accomplishes the synchronous or mutually synchronization of superhigh precision temporal frequency between caesium kind and the caesium kind; Or the principal and subordinate is synchronous between completion caesium clock and the rubidium clock; Mutually synchronization between rubidium clock and the rubidium clock; Principal and subordinate between rubidium clock and the DCXO is synchronous, the mutually synchronization between DCXO and the DCXO; Principal and subordinate between DCXO and the VCXO is synchronous; Any one node, as long as Synchronization Network is normally moved, then this node is regeneration UTC atomic time frequency reference.
Above-mentioned HTF-BITS equipment comprise standardization output unit, clock shake control unit, system control unit, alarm output unit, with reference to access unit and verification comparing unit; Said system control unit respectively with said standardization output unit, alarm output unit, clock shake control unit, be connected with the verification comparing unit with reference to access unit; Said frequency reference output with reference to access unit is connected to the clock control unit that shakes.
Above-mentioned standardization output unit is made up of frequency synthesis output unit and time encoding output unit.
The above-mentioned clock control unit that shakes is caesium clock Cs, rubidium clock Rb, DCXO or VCXO.
Above-mentionedly comprise that with reference to access unit reference source selects module, double star satellite receiver module and channelized frequencies time input interface, said channelized frequencies time input interface is connected with reference source selection module respectively with double star satellite receiver module.
The present invention has following beneficial effect:
The present invention is the extending in all direction of supporting body, MS master-slave (Master-Slaver) that anti-lethality the is strong grade MS master-slave method of synchronization by the logical communication network in national backbone network → provincial backbone network → counties and cities' level communication network → rural area village village by ground communication transmission network (mainly being much much more horizontal vertical underground optical transport networks).Pressed the successful solution of IEEE1588PTP agreement self adaptation automatic equalization compensation revise the algorithm of asymmetric difference, guarantee that the synchronous temporal frequency relative accuracy of point-to-point or end-to-end MS master-slave realizes the theoretical algorithm of high accuracy, superhigh precision, super high precision.Guaranteed to measure accurately to detect Δ T
Xy(t); Guarantee from the regeneration UTC atomic time of station clock foundation with the main website clock; The relative error of high precision reference≤± 20ns, ± 10ns, ± 2ns, the temporal frequency Synchronization Network of the national high accuracy that this optical transport network that extends in all direction that is made up of subterranean cable fully is a supporting body, superhigh precision, super high precision is the scientific invention with far-reaching great military affairs, politics, economic strategy meaning.
Description of drawings
Fig. 1 is a HTF-BITS device structure block diagram of the present invention;
Fig. 2 is the embodiment sketch map of 100 kilometers～200 kilometers split-second precision Frequency Synchronization of the present invention;
Fig. 3 is a HTF-BITS equipment principal and subordinate synchronization principles block diagram of the present invention;
Fig. 4 is the schematic block diagram of the present invention two station MA → SB → SC;
Fig. 5 is 0～1000 kilometer synchronous embodiment sketch map of the present invention;
Embodiment
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Referring to Fig. 1; Regeneration UTC atomic time superhigh precision temporal frequency Synchronization Network of the present invention interconnects time synchronized main website and time synchronized slave station through optical fiber; It is characterized in that: the one-level communication network of setting up and be carried on Trans-Provincial/Municipal on the optical fiber cables transmission network; On time synchronized main website and time synchronized slave station, HTF-BITS equipment is set respectively, HTF-BITS equipment is provided with caesium clock Cs, rubidium clock Rb, DCXO or VCXO, accomplishes the synchronous or mutually synchronization of superhigh precision temporal frequency between caesium kind and the caesium kind; Or the principal and subordinate is synchronous between completion caesium clock and the rubidium clock; Mutually synchronization between rubidium clock and the rubidium clock; Principal and subordinate between rubidium clock and the DCXO is synchronous, the mutually synchronization between DCXO and the DCXO; Principal and subordinate between DCXO and the VCXO is synchronous; Any one node, as long as Synchronization Network is normally moved, then this node is regeneration UTC atomic time frequency reference.
HTF-BITS equipment comprise standardization output unit, clock shake control unit, system control unit, alarm output unit, with reference to access unit and verification comparing unit; Said system control unit respectively with said standardization output unit, alarm output unit, clock shake control unit, be connected with the verification comparing unit with reference to access unit; Said frequency reference output with reference to access unit is connected to the clock control unit that shakes.The standardization output unit is made up of frequency synthesis output unit and time encoding output unit.The clock control unit that shakes is caesium clock Cs, rubidium clock Rb, DCXO or VCXO.Comprise reference source selection module, double star satellite receiver module and channelized frequencies time input interface with reference to access unit, channelized frequencies time input interface selects module to be connected with reference source respectively with double star satellite receiver module.
HTF-BITS equipment of the present invention is with the difference of original Frequency Synchronization net BITS equipment: it has the unified time frequency reference a reference source equipment that uses as the building of communicating by letter, and has function and the performance of regeneration UTC atomic time.
When its Master main website clock is the strontium atom clock, HTF-BITS equipment benchmark can obtain 100,000,000 and differ from one second regeneration UTC atomic time temporal frequency benchmark.When its Master clock is the fountain type cesium-beam atomic clock, then can get the regeneration UTC atomic time temporal frequency benchmark that differed from 1 second in 6,000,000 years.When its Master clock is the regeneration UTC atomic time temporal frequency benchmark that cesium-beam atomic clock that industrial goods is used can obtain to differ from 300,000 years 1 second.Therefore, we mainly provide three kinds of equipment:
LPRTF: by rubidium atomic clock is the one-level time and frequency standards from clock;
LDXTF: by two thermostat DX is the reinforced secondary time and frequency standards from clock;
LOXTF: by single thermostat low phase noise communication building video benchmark;
The said equipment all is a regeneration UTC atomic time temporal frequency benchmark feed system equipment.The so-called regeneration UTC atomic time be meant local controlled clock be cesium-beam atomic clock, rubidium atomic clock, low phase noise voltage-controlled crystal (oscillator) clock realize mutually through " loose coupling " frequency discrimination phase demodulation zero passage detection lock and upper level main website clock to carry out temporal frequency synchronous.
Compare with the BITS of original Frequency Synchronization net, the Synchronization Network of temporal frequency synchronous fusion has two topmost characteristics to be:
1. frequency departure FD and phase deviation PD:
Digital " loose coupling " frequency discrimination phase demodulation zero passage detection the most important thing is to realize the detection of " zero crossing ".This patent is the preferred plan that overcomes drift.So-called zero passage frequency discrimination phase demodulation Phase Lock Technique be exactly local ratio from clock and main website master clock phase demodulation process mutually, around the adjustment lock-in techniques that " zero point " realized
of master clock.That is to say that in whole synchronizing network all relatively realize zero cross detection the zero point of main website master clock from station clock, generations+Δ f and ± deviation of Δ PD.The test instrumentation 1725B (14 certainties of measurement) that for example we adopt in the laboratory; Observe every day (or longer) in the measured cycle; Measured data are the variation of last place reading of instrument ± 1; To be the relative frequency accuracy be ± 5E-14/ days (2MHz or 2Mbit/s), thereby we can think 1. formula.
2. TID time interval deviation is the most important index of search time interval variation.This is the tolerance high stable high accuracy atomic clock time interval and good and bad unique technical index of Synchronization Network regeneration time interval atomic time.Find as shown in the figure in the laboratory.TID≤1～2ns/ days of the low phase noise system output regeneration UTC atomic time ,≤1～2ms/160Ks.And the 2048Kbit/s that produces through coding back or be 2us～tens of us through increasing after the 50Km Optical Fiber Transmission or through the shake of TID after the instrument code conversion, the system that has is just bigger.And the regeneration UTC atomic time time reference that we provide all≤1～2ns/1 days ,≤1～2ns/7 days, one of characteristics of Here it is HTF-BITS communication building feed system.Supply with the time reference shake≤2ns of any communication network sensor terminal in the communication building thus.
Below being 100 kilometers～200 kilometers the Optical Transmission Network OTN embodiment that the present invention provides,
Referring to Fig. 2, this figure is the Mathematical Modeling sketch map and the split-second precision synchronization principles thereof of present embodiment:
Setting master clock Master of main website and UTC absolute deviation constantly is E among the figure
0, be delivered to slave station from clock port by the regeneration UTC atomic time time reference that produces behind the synchronous upper level master clock of main website master clock through the optical transmission bearer network, defining its propagation delay time value is respectively T
x(t), T
y(t) its asymmetric difference DELTA T
Xy(t)=| T
x(t)-T
y(t) |.
The synchronous principle of its MS master-slave split-second precision is: when the master of main website time device (for example be 300,000 produce one second cesium-beam atomic clocks per year) set up with the UTC time phase difference be E
0One-level superhigh precision time reference after, at first the frequency reference interface (2048KHz or 2048Kbps) through output is realized a Frequency Synchronization (can be SDH, MSTP, PTN and other optical transmission devices) with 100～200Km to some optical transceiver.The as above mathematical model shown in Fig. 3.
Frequency Synchronization is realized at the MS master-slave two ends: just the relative time spacing bias of main website and slave station is shown in 1. formula
E in the formula
0Be main website and the absolute initial time spacing bias constantly of UTC: (general≤50～100ns),
It is the main website clock and the residual frequency deviation that realizes from station clock after the Frequency Synchronization.Here because we have adopted " frequency discrimination phase demodulation zero passage " " loose coupling " digital intelligence lock phase patent to have all theoretical derivation results of high-gain second order loop; And realization and main website clock zero crossing test experience chamber simulation test effect, the resultant effect of this binomial≤± 5E-14/ days.Certain communication operation company Shanghai message center → two results of 7 days of 40 kilometers Qingpu actual measurements:
FD=± 2.31E-13/ days ± E-14/7 days
PD=± 20ns/ days ± 20ns/ days
Be the model of a success.If the deviation after these two introducings is just ignored.Then 1. formula can be rewritten
Δ T in the formula
Xiyi(t) be asymmetric difference in the IEEE1588 split-second precision synchronous protocol, this is because a kind of special error (transmitting identical with the radio telephone of sky) the asymmetric difference of propagation time delay that optical transport network is introduced when transmitting.The different model optical cable of introducing 1000 kilometers of this asymmetric differences according to * * * data is about about 6.6ns～2140ns.100 kilometers optical cable maximum differences are about 214ns so.The present invention serves as according to the Mathematical Modeling of utilizing our foundation with this maximum, under the situation that asymmetric difference exists, can detect its preferred plan through PTP IEEE1588 agreement accurately accurately and utilize three integrated application of patent exactly.What is embodied as: because the transient measurement value of random noise and shake is the facture quantitative test that must adopt the informational probability opinion by the multinomial random noise existence of normal distribution.Accurate measuring technology must have the benchmark of relatively differentiating transient change accurately, and this benchmark is exactly local low phase noise output system from clock.Because the short-term stability performance of this system 1 second～tens of seconds (crystal clock and rubidium clock)～hundreds of seconds (caesium)～and thousands of seconds instantaneous value, its phase jitter, phase noise, instantaneous shake of the time interval are very little.As preceding figure x all≤± 1ns.Just can realize in a short time with " I " be that master clock goes filtering and is smoothly carried out in the random noise of the data code flow (containing time reference) that is delivered to slave station from main website and shake as this locality of two-way temporal frequency code stream comparison from clock, just can realize its one of detection technique accurately.
It two is that two constant temperature voltage-controlled crystal (oscillator)s with 1E-9 are example: in 100 seconds its TID100 of low phase noise system in second all≤± 1ns, but it and master clock (≤± 1E-12/ days) compare the drift value that then has 1～100ns (1 ns of per second).If after realizing the MS master-slave Frequency Synchronization earlier, its effect is just different.VCXO in 100 seconds drift can be ignored, remain 100 seconds local VCXO all obtain≤± change at random of 1ns.The accurately shake and the drift of detected transmission equipment and cable system at this moment, shake that filtering is excessive and drift just can realize.
It three is its propagation delay time＜0.5ms in 100 kilometers, T
x(t)+T
y(t)=C＜1ms.We carry out the exact value that loopback test can access C in the formula, again the nominal of C value are turned to 1ms, and are divided into 1/1000=1ms at main website master clock and UTC (1PPS) pulse in synchronous 1 second, i.e. C
Mark=1ms f
C mark 1=1KHz, the master clock frequency that is about to 10MHz is divided into the 1ms=C synchronous with UTC
MarkJust can accomplish 1000 times duplicate detection Δ T 1 second according to the relational expression of Mathematical Modeling
Xy(t), C
Mark＞C value also can be accomplished the detection more than 1000 times in 1 second.Can accomplish 10000 duplicate measurementss 10 seconds.We contrast, if directly detect the method for 1PPS (be per second once), 10 seconds can only repeat 10 times, as shown in the table, and accuracy is respectively than 33 times of each 1 second improves.
It four is: the scale of measurement in the time interval, can obtain mutually at the time interval of 10ns yardstick 7, digital " loose coupling " lock＜± the detection accuracy of 20ns.If adopt the time interval scale of measurement of 5ns can obtain≤± the detection precision of 10ns.Select for use the time interval scale of measurement of 1ns to obtain≤± precision of 2ns.The precision that makes of this four pipe Qi Xiake is respectively≤± 20ns ,≤± 10ns ,≤± other technological precision of three levels of 2ns.
Therefore the Mathematical Modeling set up with Fig. 2 of the present invention with automatic equalization locking patented technology the two-way respectively time of slave station receiving terminal of data comparison link obtain be≤± during 20ns, behind the automatic equalization phase-locking compensation main website master clock with from the comparison relative time spacing bias of station clock≤± 20ns.As shown in the table
2 points also need be described here; First point: owing to be to adopt digital " loose coupling " balanced lock to revise asymmetric difference mutually; Thereby long-time 10 years or longer all must the guarantee in this indication range change, and the whole network keep with the relative deviation of master clock≤± 20ns (≤± 10ns with≤± 2ns) within.Second point: select C for use
MarkThe purposes in cycle is to consider to also have T outside the variation of asymmetric difference
x(t), T
y(t), to the compensation correction of positive and negative two changes of direction.The basis that (leaving a compensating for variations surplus) sets up.In engineering design,,, two stations such as MA → SB → SC is arranged in addition, simplifies, can derive following relationship like Fig. 4 like Fig. 2 if surpass 100 kilometers:
T
x1(t)+T
y1(t)＝C
1-----------------------①
T
x2(t)+T
y2(t)＝C
2-----------------------②
T
X1(t)+T
X2(t)+T
Y2(t)+T
Y1(t)=C
Always---------3.
SC promptly second station be LPRTC the time, if (synchronizer of band rubidium atomic clock) exists
T
x(t) and T
y(t) through behind the one-level automatic equalization phase-locking compensation, second level series connection utilizes this Mathematical Modeling can be with can be from 1. 2. 3. 4. synchronously, at the second station SC since C total=C
1+ C
2So, lock mutually on the one hand with selecting more longer the observing time that accurately measures in the automatic equalization of SC.Select the steady track parameter of digital phase-locked loop better, equivalent three dB bandwidth selects smaller filtering shake and noise effects more excellent.The Δ T of this moment
X2y2(t) be accurate value from main website → SC slave station, it comprises between MA → SB through the residue difference of automatic equalization compensation and the summation of the asymmetric difference between SB → SC, marks 2 available (like C so compensate C from the automatic equalization of MA → SC
Mark 2=2ms, f
C mark 2=500Hz), to Δ T
X2y2(t) precisely detect, just eliminated the accumulation of the asymmetric difference of cascade for the through direct comparison of bi-directional data link time code stream, that is to say that the deviation in the automatic equalization lock phase of SC remains the deviation of the absolute moment with UTC with the MA comparison with MA → SC
The relative deviation of
and Master≤± 20ns/ days.
0～1000 kilometer apart from high accuracy superhigh precision mathematical model sketch map.As shown in Figure 5, reasoning makes up national temporal frequency first link backbone network and super high precision temporal frequency Synchronization Network thus
Because national backbone network is set up and is carried on the optical fiber cables transmission network that extends in all direction.Can realize the synchronous or mutually synchronization of superhigh precision temporal frequency between caesium kind and the caesium kind; Can realize that also the principal and subordinate is synchronous between caesium kind and the rubidium clock, mutually synchronization between rubidium clock and the rubidium clock; Principal and subordinate between rubidium clock and the DCXO (reinforced secondary clock) is synchronous, the mutually synchronization between DCXO and the DCXO; Principal and subordinate between DCXO and the VCXO is synchronous.Any one node, as long as synchronizing network normally moves, then any node all is a regeneration UTC atomic time frequency reference.Difference each node that only is to have no progeny in the network causes the difference of node timekeeping performance because reference clock is different.
Claims (5)
1. regeneration UTC atomic time superhigh precision temporal frequency Synchronization Network; Said Synchronization Network interconnects time synchronized main website and time synchronized slave station through optical fiber; It is characterized in that: the one-level communication network of setting up and be carried on Trans-Provincial/Municipal on the optical fiber cables transmission network; On time synchronized main website and time synchronized slave station, HTF-BITS equipment is set respectively; Said HTF-BITS equipment is provided with caesium clock Cs, rubidium clock Rb, DCXO or VCXO, accomplishes the synchronous or mutually synchronization of superhigh precision temporal frequency between caesium kind and the caesium kind; Or the principal and subordinate is synchronous between completion caesium clock and the rubidium clock; Mutually synchronization between rubidium clock and the rubidium clock; Principal and subordinate between rubidium clock and the DCXO is synchronous, the mutually synchronization between DCXO and the DCXO; Principal and subordinate between DCXO and the VCXO is synchronous; Any one node, as long as Synchronization Network is normally moved, then this node is regeneration UTC atomic time frequency reference.
2. regeneration UTC atomic time superhigh precision temporal frequency Synchronization Network according to claim 1 is characterized in that: said HTF-BITS equipment comprise standardization output unit, clock shake control unit, system control unit, alarm output unit, with reference to access unit and verification comparing unit; Said system control unit respectively with said standardization output unit, alarm output unit, clock shake control unit, be connected with the verification comparing unit with reference to access unit; Said frequency reference output with reference to access unit is connected to the clock control unit that shakes.
3. regeneration UTC atomic time superhigh precision temporal frequency Synchronization Network according to claim 2, it is characterized in that: said standardization output unit is made up of frequency synthesis output unit and time encoding output unit.
4. regeneration UTC atomic time superhigh precision temporal frequency Synchronization Network according to claim 2 is characterized in that: the said clock control unit that shakes is caesium clock Cs, rubidium clock Rb, DCXO or VCXO.
5. regeneration UTC atomic time superhigh precision temporal frequency Synchronization Network according to claim 2; It is characterized in that: saidly comprise that with reference to access unit reference source selects module, double star satellite receiver module and channelized frequencies time input interface, said channelized frequencies time input interface is connected with reference source selection module respectively with double star satellite receiver module.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546224A (en) * | 2013-10-11 | 2014-01-29 | 成都泰富通信有限公司 | Single-fiber ultrahigh-precision time transmission method |
| CN110808803A (en) * | 2019-10-16 | 2020-02-18 | 北京航空航天大学 | High-reliability and high-performance reference clock system |
| CN111431654A (en) * | 2020-03-30 | 2020-07-17 | 中国电子科技集团公司第五十四研究所 | Combined timing method of multiple rubidium clocks of master and slave hosts |
| CN112068165A (en) * | 2020-09-04 | 2020-12-11 | 北京航空航天大学 | High-precision time performance indirect detection method |
| CN113938238A (en) * | 2021-09-29 | 2022-01-14 | 山东浪潮科学研究院有限公司 | Time synchronization method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101902292A (en) * | 2009-12-30 | 2010-12-01 | 西安大唐电信有限公司 | UTC high-precision time synchronization method based on optical transmission network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101902292A (en) * | 2009-12-30 | 2010-12-01 | 西安大唐电信有限公司 | UTC high-precision time synchronization method based on optical transmission network |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546224A (en) * | 2013-10-11 | 2014-01-29 | 成都泰富通信有限公司 | Single-fiber ultrahigh-precision time transmission method |
| CN110808803A (en) * | 2019-10-16 | 2020-02-18 | 北京航空航天大学 | High-reliability and high-performance reference clock system |
| CN111431654A (en) * | 2020-03-30 | 2020-07-17 | 中国电子科技集团公司第五十四研究所 | Combined timing method of multiple rubidium clocks of master and slave hosts |
| CN111431654B (en) * | 2020-03-30 | 2022-03-01 | 中国电子科技集团公司第五十四研究所 | Combined timing method of multiple rubidium clocks of master and slave hosts |
| CN112068165A (en) * | 2020-09-04 | 2020-12-11 | 北京航空航天大学 | High-precision time performance indirect detection method |
| CN112068165B (en) * | 2020-09-04 | 2023-01-17 | 北京航空航天大学 | High-precision time performance indirect detection method |
| CN113938238A (en) * | 2021-09-29 | 2022-01-14 | 山东浪潮科学研究院有限公司 | Time synchronization method and system |
| CN113938238B (en) * | 2021-09-29 | 2023-05-16 | 山东浪潮科学研究院有限公司 | Time synchronization method and system |
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