CN107483136A - A kind of clock synchronizing method between fixed communication apparatus - Google Patents
A kind of clock synchronizing method between fixed communication apparatus Download PDFInfo
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- CN107483136A CN107483136A CN201710673468.0A CN201710673468A CN107483136A CN 107483136 A CN107483136 A CN 107483136A CN 201710673468 A CN201710673468 A CN 201710673468A CN 107483136 A CN107483136 A CN 107483136A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004891 communication Methods 0.000 title claims abstract description 16
- 230000001360 synchronised effect Effects 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims description 3
- 230000003111 delayed effect Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 208000000058 Anaplasia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 239000002674 ointment Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention discloses the clock synchronizing method between a kind of fixed communication apparatus, some equipment for needing the deadline synchronous are positioned over known location, one of them is referred to as main equipment, remaining is referred to as slave unit, main equipment counts according to itself clock source periodically sends wireless synchronization signal, and the precise moments that main equipment launches the synchronizing signal are modulated with synchronizing signal；Slave unit receives the synchronizing signal of main equipment, and measures the precise moments that synchronizing signal reaches this equipment, while demodulation obtains the emission time of synchronizing signal；The transmitting of synchronizing signal and the time of reception are uploaded central apparatus by all slave units, and the clock jitter of each slave unit and main equipment is calculated by central apparatus, realize the time synchronized of main equipment and slave unit.The present invention enables slave unit to adjust itself cycle accurate to main equipment clock, and it is synchronous to complete wireless time.
Description
Technical field
The present invention relates to communication technical field, the clock synchronizing method between specifically a kind of fixed communication apparatus.
Background technology
Radio positioning system is generally made up of locating source and user equipment, is obtained by radio communication therebetween
The navigation information such as the position of user equipment and time.It is one of which location technology to measure radio signal reaching time-difference, this
Kind method generally only needs user equipment overseas broadcast radio signal, and locating source receives and obtains signal arrival time difference, and
Positioned afterwards by hyperbolic and obtain position information of user equipment.This reaching time-difference measuring method is same to the time between locating source
Step requires higher, and the timing tracking accuracy between the precision and locating source of final positioning result is closely related.
The content of the invention
It is an object of the invention to provide the clock synchronizing method between a kind of fixed communication apparatus, to solve above-mentioned background skill
The problem of being proposed in art.
To achieve the above object, the present invention provides following technical scheme：
A kind of clock synchronizing method between fixed communication apparatus, comprises the following steps：
1) some equipment for needing the deadline synchronous being positioned over known location, one of them is referred to as main equipment, its
Remaining to be referred to as slave unit, main equipment counts according to itself clock source periodically sends wireless synchronization signal, is modulated in synchronizing signal
There are the precise moments that main equipment launches the synchronizing signal；
2) slave unit receives the synchronizing signal of main equipment, and measures the precise moments that synchronizing signal reaches this equipment, together
When demodulate to obtain the emission time of synchronizing signal；
3) transmitting of synchronizing signal and the time of reception are uploaded central apparatus by all slave units, are calculated by central apparatus
The clock jitter of each slave unit and main equipment, realize the time synchronized of main equipment and slave unit.
As the further scheme of the present invention：All devices transmit number by wired or wireless data link to central apparatus
According to.
As the further scheme of the present invention：Wired or wireless data link includes but is not limited to transmit using Ethernet.
As the further scheme of the present invention：Central apparatus include but is not limited to computer.
As the further scheme of the present invention：Clock jitter includes the initial clock deviation between master-slave equipment, at any time anaplasia
The clock jitter of change, the range deviation of equipment room and fixing process are delayed.
As the further scheme of the present invention：Fixing process delay includes processing delay and atmospheric delay.
As the further scheme of the present invention：The clock jitter changed over time：
Tsync_Tx(n) be main equipment transmitting synchronizing signal at the time of, n be discretization time point sequence number；
Range deviations and fixing process delay of the dT between master-slave equipment, the value is constant；
bms(n) clock jitter changed over time between master-slave equipment, unit s；
dms(n) it is the clock drift of master-slave equipment, unit s/s；
If TmFor the main equipment time of any time, TsFor the corresponding slave unit moment, then the two has following relation：
Tm=Ts-bms
Slave unit T is tried to achieve using above formulasMain equipment time T corresponding to momentm, it is synchronous with main equipment to reach slave unit clock.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention can eliminate frequency deviation and frequency as caused by equipment room using different clock sources in system work process
Clock jitter caused by drift etc., slave unit can adjust itself cycle accurate to main equipment clock, and it is synchronous to complete wireless time.
Brief description of the drawings
Fig. 1 is the equipment connecting relation figure of the embodiment of the present invention 1；
Fig. 2 is the graph of a relation of the master-slave equipment time change of the embodiment of the present invention 1.
Embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described,
Obviously, described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of protection of the invention.
Embodiment 1
Refer to Fig. 1-2, in the embodiment of the present invention, the clock synchronizing method between a kind of fixed communication apparatus is, it is necessary to complete
Some equipment of time synchronized are placed on known location, and one of them is referred to as main equipment, and remaining is referred to as slave unit, and master sets
Standby periodic transmission is modulated with the wireless signal at accurate delivery moment, and slave unit receives and measures the time of reception, the time of reception and
The difference of emission time contains initial clock deviation between master-slave equipment, changes over time clock jitter, the distance of equipment room
Deviation, fixing process delay.Wherein the range deviation of equipment room can accurately measure in deployment；Fixing process delay is constant
Value, can be obtained by demarcating measurement in advance；The clock jitter changed over time is mainly by the frequency deviation and frequency drift of equipment room clock source
Cause, eliminated in system work process by real-time follow-up.
Main equipment and slave unit are fixedly installed in known location, and the distance between main equipment and each slave unit deviation can essences
Really measurement obtains.All devices transmit number by wired or wireless data link (such as Ethernet) to central apparatus (such as computer)
According to.A kind of equipment connecting relation is as shown in Figure 1.
Synchronous to complete wireless time, main equipment counts according to itself clock source and periodically sends wireless synchronization signal, together
The precise moments that main equipment launches the synchronizing signal are modulated with step signal.Slave unit receives the synchronizing signal of main equipment, and
Measurement synchronizing signal reaches the precise moments of this equipment, while demodulation obtains the emission time of synchronizing signal.All slave units will
The transmitting of synchronizing signal and the time of reception upload central apparatus, by central apparatus be calculated each slave unit and main equipment when
Clock deviation is so as to realizing the time synchronized of main equipment and slave unit.
Comprise the following steps that.
Define following symbol：
It is T at the time of the transmitting synchronizing signal of main equipmentsync_Tx(n), wherein, n is the time point sequence number of discretization.
It is T at the time of receiving the synchronizing signal of this main equipment transmitting for any slave unitsync_Rx(n)。
The equipment room range deviation that can be measured in advance between master-slave equipment and fixing process delay (including processing delay, ring
Border delay etc.) dT is set to, the value is constant.
The clock jitter b changed over time between master-slave equipmentms(n) (from-main), unit s.
Then slave unit, which receives time of reception of main equipment synchronizing signal, to be expressed as：
Tsync_Rx(n)=Tsync_Tx(n)+dT+bms(n) (1)
It is to receive to write on left side with emission time and the amount that can be measured i.e. fixing process delay and obtain by known quantity：
Tsync_Rx(n)-Tsync_Tx(n)-dT=bms(n) (2)
Because clock drift be present in master-slave equipment clock source deviation, therefore right side b in (2)ms(n) it is time-varying, by its mould
Type turns to linear function i.e.
bms(n+1)=bms(n)+dms(n)t (3)
Wherein, dms(n) it is the clock drift of master-slave equipment, unit s/s, t are the time interval of discretization (with main equipment
Clock is defined), unit s.
Clock drift is modeled as：
dms(n+1)=dms(n)+wn (4)
Wherein, wnFor Gaussian sequence.
Simultaneously to reduce influence of noise, it can be estimated using optimal estimation device such as Kalman filter, state vector
For：
X=[bms, dms]T (5)
The one step state transition matrix of discretization is：
Observed quantity is：
Z (n)=Tsync_RX(n)-Tsync_TX(n)-dT (7)
Design matrix is：
H=[1,0] (8)
It is any for the clock jitter changed over time at discrete time point to master-slave equipment and the estimation of drift, note above
The main equipment time at moment is Tm, the machine time that slave unit corresponds to the moment is Ts, then the two have following relation
Tm=Ts-bms (9)
To obtain slave unit TsMoment and main equipment moment TmBetween accurate clock jitter bms, can be in nearest estimation
Carve the clock jitter obtained and extrapolated on the basis of the estimated result of drift, it is assumed that distance TmNearest discrete time point mark
Number it is n, then according to (3), from Tsync_Tx(n) T is arrivedmThe slope of period master-salve clock change of error amount can be approximately dms(n), therefore
Clock jitter is as follows.
bms=dms(n)(Tm-Tsync_Tx(n)-dT)+bms(n) (10)
Notice T in (10)mFor slave unit TsThe corresponding time, and the time can not measure, and be to need finally to try to achieve not
The amount of knowing, T can only be passed throughsIt is calculated, therefore utilizes (9) that (10) are further converted into clock jitter bmsWith slave unit moment Ts
Relation it is as follows：
bms=dms(n)(Ts-bms-Tsync_Tx(n)-dT)+bms(n) (11)
Arrangement obtains：
Wherein, dms(n)、bms(n) it is Kalman filter estimated result, TsRead to obtain from local clock by slave unit,
Tsync_Tx(n) local clock is read by main equipment to obtain.
(9) are utilized can finally to try to achieve slave unit TsMain equipment T corresponding to momentm, so as to reach slave unit clock and master
The synchronous purpose of equipment.
The relation of master-slave equipment time change is as shown in Figure 2.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It is appreciated that other embodiment.
Claims (7)
1. the clock synchronizing method between a kind of fixed communication apparatus, it is characterised in that comprise the following steps：
1) some equipment for needing the deadline synchronous are positioned over known location, one of them is referred to as main equipment, remaining quilt
Referred to as slave unit, main equipment counts according to itself clock source periodically sends wireless synchronization signal, is modulated with leading in synchronizing signal
Equipment launches the precise moments of the synchronizing signal；
2) slave unit receives the synchronizing signal of main equipment, and measures the precise moments that synchronizing signal reaches this equipment, solves simultaneously
Tune obtains the emission time of synchronizing signal；
3) transmitting of synchronizing signal and the time of reception are uploaded central apparatus by all slave units, are calculated by central apparatus each
The clock jitter of slave unit and main equipment, realize the time synchronized of main equipment and slave unit.
2. the clock synchronizing method between fixed communication apparatus according to claim 1, it is characterised in that all devices pass through
Wired or wireless data link transmits data to central apparatus.
3. the clock synchronizing method between fixed communication apparatus according to claim 2, it is characterised in that wired or wireless number
Include but is not limited to transmit using Ethernet according to link.
4. the clock synchronizing method between fixed communication apparatus according to claim 2, it is characterised in that central apparatus include
But it is not limited to computer.
5. the clock synchronizing method between fixed communication apparatus according to claim 1, it is characterised in that clock jitter includes
Initial clock deviation between master-slave equipment, the clock jitter changed over time, the range deviation of equipment room and fixing process are delayed.
6. the clock synchronizing method between fixed communication apparatus according to claim 5, it is characterised in that fixing process postpones
Including processing delay and atmospheric delay.
7. the clock synchronizing method between fixed communication apparatus according to claim 5, it is characterised in that change over time
Clock jitter：
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Tsync_Tx(n) be main equipment transmitting synchronizing signal at the time of, n be discretization time point sequence number；
Range deviations and fixing process delay of the dT between master-slave equipment, the value is constant；
bms(n) clock jitter changed over time between master-slave equipment, unit s；
dms(n) it is the clock drift of master-slave equipment, unit s/s；
If TmFor the main equipment time of any time, TsFor the corresponding slave unit moment, then the two has following relation：
Tm=Ts-bmx
Slave unit T is tried to achieve using above formulasMain equipment time T corresponding to momentm, it is synchronous with main equipment to reach slave unit clock.
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| CN201710673468.0A CN107483136A (en) | 2017-08-09 | 2017-08-09 | A kind of clock synchronizing method between fixed communication apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161545A (en) * | 2018-02-12 | 2019-08-23 | 清华大学 | Positioning system and its positioning signal generation method |
| CN110418405A (en) * | 2019-09-09 | 2019-11-05 | 北京纳飞时空信息技术有限公司 | A kind of distributed signal receiving time synchronous method and its system |
| CN113765839A (en) * | 2020-06-03 | 2021-12-07 | 华为技术有限公司 | Air interface time synchronization method and equipment |
| WO2023109267A1 (en) * | 2021-12-17 | 2023-06-22 | 中兴通讯股份有限公司 | Information measurement method and apparatus |
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| CN1480873A (en) * | 2002-09-06 | 2004-03-10 | ������������ʽ���� | Method, system and device for detecting location of terminal in network |
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| CN1480873A (en) * | 2002-09-06 | 2004-03-10 | ������������ʽ���� | Method, system and device for detecting location of terminal in network |
| US20100138187A1 (en) * | 2007-08-06 | 2010-06-03 | Abb Research Ltd | Estimating a time offset between stationary clocks |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161545A (en) * | 2018-02-12 | 2019-08-23 | 清华大学 | Positioning system and its positioning signal generation method |
| CN110418405A (en) * | 2019-09-09 | 2019-11-05 | 北京纳飞时空信息技术有限公司 | A kind of distributed signal receiving time synchronous method and its system |
| CN113765839A (en) * | 2020-06-03 | 2021-12-07 | 华为技术有限公司 | Air interface time synchronization method and equipment |
| CN113765839B (en) * | 2020-06-03 | 2022-07-29 | 华为技术有限公司 | Air interface time synchronization method and equipment |
| WO2023109267A1 (en) * | 2021-12-17 | 2023-06-22 | 中兴通讯股份有限公司 | Information measurement method and apparatus |
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