CN108199799A - A kind of satellite communication terminal digital dock synchronous method and device - Google Patents
A kind of satellite communication terminal digital dock synchronous method and device Download PDFInfo
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- CN108199799A CN108199799A CN201711412159.4A CN201711412159A CN108199799A CN 108199799 A CN108199799 A CN 108199799A CN 201711412159 A CN201711412159 A CN 201711412159A CN 108199799 A CN108199799 A CN 108199799A
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- frequency
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- digital dock
- clock
- master clock
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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
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0617—Systems characterised by the synchronising information used the synchronising signal being characterised by the frequency or phase
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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
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- Computer Networks & Wireless Communication (AREA)
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- Synchronisation In Digital Transmission Systems (AREA)
- Radio Relay Systems (AREA)
Abstract
A kind of satellite communication terminal digital dock synchronous method of the present invention and device, method include：The temporal information continuously transmitted in setting time interval according to main website, calculate master clock and the difference on the frequency of terminal digital dock, and a frequency adjusted value is calculated using frequency adjustment algorithm according to difference on the frequency, and according to frequency adjusted value control terminal digital dock output frequency, to realize the Frequency Synchronization with master clock；Newest master clock will be obtained and be added to obtain main station time, and this time is loaded onto local zone time with the link delay set, realize the time synchronization of local zone time and master clock.Device includes：Main station time acquisition module, adjustment control module and numerical frequency conversion module, Loading Control module.Convergence rate, precision and the robustness of clock synchronization is greatly improved in the present invention, has the advantages of simple structure and easy realization, can rapidly reach the master clock purpose synchronous with local clock.
Description
Technical field
The invention belongs to signal of communication processing technology field, be related to a kind of satellite communication terminal digital dock synchronous method and
Device.
Background technology
With the expansion of the market demand, satellite communication industry is developing rapidly, and user is increasing.It is logical to make full use of
Believe the transponder bandwidth resource on satellite, TDMA standards are used by multiple mainstream satellite communication protocols.The core of TDMA standards
It is then that each terminal is synchronous with the clock of main website.The quality that clock synchronizes largely affects the bandwidth usage of system
Rate.Clock is synchronized comprising two aspects --- clock rate synchronization and time synchronization.
Since satellite communication terminal has a very wide distribution, temperature, longitude and latitude and air pressure change are big, at the beginning of leading to each terminal crystal oscillator
Beginning difference on the frequency is handed over greatly, and during leading to terminal operating, range of temperature is larger, causes clock jitter larger.If without when
Clock synchronizes, then to avoid that larger protection interval due to spectrum overlapping caused by clock jitter, can be used, main website sends terminal
Packet arrival moment and the deviation for it is expected moment, feed back to terminal, terminal is according to the method that feedback information compensates come when realizing
Clock synchronizes.Precious satellite bandwidth resource is greatly wasted in this way, and stability is not high, especially in terminal first login,
Since main website does not obtain any Time of day offsets, larger protection interval and adjustment time are needed.Or using height on hardware
Precision crystal oscillator or GPS clock synchronization module provide high precision clock, but increase terminal cost again in this way for terminal.
Invention content
Problems to be solved by the invention are how rapidly to be realized in satellite communication using less satellite bandwidth resource
Clock synchronizes and improves convergence rate, precision and robustness between terminal and main website.
Technological means for solving subject is to propose a kind of satellite communication terminal digital dock synchronous method and device,
Using digital pattern, achieve the purpose that master clock is synchronous with local clock.
A kind of satellite communication terminal digital dock synchronous method proposed by the present invention, includes the following steps：
According to the temporal information that main website continuously transmits in setting time interval, when calculating master clock and terminal number
The difference on the frequency of clock and a frequency adjusted value is calculated, and according to frequency adjusted value control using frequency adjustment algorithm according to difference on the frequency
Terminal digital dock output frequency processed, to realize the Frequency Synchronization with master clock；
After realizing the Frequency Synchronization with master clock, it is added newest master clock is obtained with the link delay set
Local zone time is loaded onto to main station time, and by this time, realizes the time synchronization of local zone time and master clock.
Further, as a preferred technical solution of the present invention, Frequency Synchronization is persistently adjusted in the method, and
Time synchronization only carries out once.
Further, as a preferred technical solution of the present invention, frequency adjustment algorithm includes two points in the method
Method and proportional plus integral control algorithm, wherein the dichotomy control module makes frequency for control terminal digital dock output frequency
Deviation restrains, and it is defeated to be switched to proportional plus integral control module control terminal digital dock after the dichotomy adjustment number for reaching setting
Going out frequency makes difference on the frequency be maintained in the levelling thickness range of setting.
Further, as a preferred technical solution of the present invention, which is characterized in that main website is set in the method
Time interval is 30 to 64ms.
Further, as a preferred technical solution of the present invention, the levelling thickness range set in the method is main website
In the range of the 1ppm of clock.
A kind of satellite communication terminal digital dock synchronizing device proposed by the present invention, including：
Main station time acquisition module calculates for obtaining the temporal information that main website continuously transmits in setting time interval
The newest master clock of master clock and main website after Frequency Synchronization；
Control module and numerical frequency conversion module are adjusted, wherein adjustment control module is used to obtain terminal digital dock,
And master clock and the difference on the frequency of terminal digital dock are calculated, a frequency is calculated using frequency adjustment algorithm according to difference on the frequency
Adjusted value, and digital frequency transposition module is controlled to adjust terminal digital dock output frequency according to frequency adjusted value, to realize
With the Frequency Synchronization of master clock；
Loading Control module, for being prolonged according to the newest master clock that main station time acquisition module obtains with the link set
Shi Xiangjia obtains main station time, and this time is loaded onto local zone time, realizes the time synchronization of local zone time and master clock.
Further, as a preferred technical solution of the present invention, the adjustment control module includes：Dichotomy controls
Module and proportional plus integral control module, wherein dichotomy control module are used to make frequency in control terminal digital dock output frequency
Deviation restrains, and it is defeated to be switched to proportional plus integral control module control terminal digital dock after the dichotomy adjustment number for reaching setting
Going out frequency makes difference on the frequency be maintained in the levelling thickness range of setting.
Invention effect has：Compared with prior art, the invention has the advantages that using digital pattern, without any mould
Intend frequency conversion device, eliminate due to the baneful influences such as base band data SPA sudden phase anomalies caused by simulation clock adjustment, and cut down hard
Part is paid wages, and convergence rate, precision and the robustness that by dichotomy and the combination of PI clock to be greatly improved synchronous, right
The high-precision of target clock frequency, high robust, indifference synchronize.Frequency dividing variation, will not with being distributed in the entire adjustment period
Generate long-time frequency discontinuity.And such method has the advantages of simple structure and easy realization, and can rapidly reach master clock and local clock
Synchronous purpose.
And the digital dock synchronous method of the present invention is suitable for communication terminal and is synchronized into row clock.
Therefore, the advantages of present invention has has：
(1) clock rate synchronization is initially controlled using dichotomy, and therefore, clock rate synchronization speed is fast.
(2) the clock rate synchronization later stage is controlled using PI, and therefore, clock rate synchronization stability and strong robustness are applicable in
In satellite communication field.
(3) using digital frequency conversion clock, it is therefore not necessary to any simulated frequency conversion device, and without high precision clock, it can be substantially
Reduce terminal hardware cost.In addition simulation clock frequency can also be avoided to adjust the deterioration to baseband performance.
(4) using 2 time adjustment modes, therefore, terminal and the time deviation of main website under original state can be effectively reduced,
Reduce terminal and log in packet sending time deviation.
Description of the drawings
The schematic diagram of satellite communication system that Fig. 1 is used in for the present invention.
Fig. 2 is the principle schematic of Satellite communication terminal digital dock synchronizing device of the present invention.
Specific embodiment
Hereinafter, it is described in detail based on attached drawing for the present invention.
The present invention devises a kind of satellite communication terminal digital dock synchronous method, and this method can operate with satellite communication system
In system, the structure of satellite communication system is as shown in Figure 1, wherein dotted portion is the digital dock sync section of the present invention.This hair
Bright digital dock synchronous method specifically comprises the following steps：
Step 1, according to main website with the temporal information continuously transmitted in setting time interval, calculate master clock and terminal
The difference on the frequency of digital dock.
Preferably, when main website is according to setting time interval transmission time information, such as setting wherein in the step 1 of the method
Between between be divided into 30 to 64ms, but the present invention is not limited thereof.
Step 2 often calculates a difference on the frequency, poor according to the clock frequency calculated, is calculated using frequency adjustment algorithm
Go out a frequency adjusted value, then according to frequency adjusted value control terminal digital dock output frequency, realize the frequency with master clock
Rate synchronizes.
In the present embodiment, terminal local digital dock is generated by variable division using high frequency internal clocking.According to satellite
Communication feature variable frequency range is controlled in the 1ppm of target clock, and adjustable accuracy is the 0.01ppm of target clock, therefore can
Being set as the correcting range set for the first time in the range of the 1ppm of master clock, according to terminal clock and the frequency of target clock
Difference carries out clock frequency Fast synchronization using dichotomy and proportional plus integral control PI algorithms.
Specifically, the frequency adjustment algorithm includes dichotomy and proportional plus integral control algorithm, wherein the dichotomy control
Molding block is used to, in synchronous initial stage control terminal digital dock output frequency, make frequency departure Fast Convergent, reach setting
Being switched to proportional plus integral control module control terminal digital dock output frequency after dichotomy adjustment number is maintained at difference on the frequency
In the levelling thickness range of setting.
After step 3 and the Frequency Synchronization of master clock, the master clock of newest acquisition is added with the link delay set
Main station time is obtained, and this time is loaded onto local zone time, realizes the time synchronization with the clock of main website.
In this step, after terminal clock first time time adjustment, according to terminal digital dock and as target clock
The difference on the frequency of master clock is controlled using PI and carries out clock rate synchronization.After clock difference on the frequency is less than a certain range, using PI
The high-precision to target clock frequency, high robust, indifference or the smaller synchronization of error are realized in control.Preferably, clock frequency
Adjustment carries out always, and time synchronization only carries out once.
Wherein, frequency conversion value is controlled to be provided by dichotomy and PI control modules terminal digital dock, frequency dividing variation is with dividing
Cloth will not generate long-time frequency discontinuity within the entirely adjustment period.
Clock frequency error in dichotomy is reduced and carries out the correction of terminal time first time afterwards to a certain extent by the method.
And clock frequency error reduction is subjected to second of terminal time correction afterwards to a certain extent in PI controls.Using total type matrix
Formula, without simulated frequency conversion device, suitable for communication terminal clock rate synchronization.
On this basis, the present invention also proposes a kind of satellite communication terminal digital dock synchronizing device, principle such as Fig. 2 institutes
Show, device includes：
Main station time acquisition module calculates for obtaining the temporal information that main website continuously transmits in setting time interval
The newest master clock of master clock and main website after Frequency Synchronization；
Control module and numerical frequency conversion module are adjusted, the adjustment control module is used to obtain terminal digital dock,
And master clock and the difference on the frequency of terminal digital dock are calculated, a frequency is calculated using frequency adjustment algorithm according to difference on the frequency
Adjusted value, and digital frequency transposition module is controlled to adjust terminal digital dock output frequency according to frequency adjusted value, to realize
With the Frequency Synchronization of master clock；
Loading Control module, for being prolonged according to the newest master clock that main station time acquisition module obtains with the link set
Shi Xiangjia obtains main station time, and this time is loaded onto local zone time, realizes the time synchronization of local zone time and master clock.
Wherein, the adjustment control module can include：Dichotomy control module and proportional plus integral control module.Described two
Point-score control module is used to, in synchronous initial stage control terminal digital dock output frequency, make frequency departure Fast Convergent, reach
Being switched to proportional plus integral control module control terminal digital dock output frequency after the dichotomy adjustment number of setting makes difference on the frequency
It is maintained in the levelling thickness range of setting.Terminal digital dock control frequency conversion value is carried by dichotomy control module and PI control modules
For frequency dividing variation with being distributed in the entire adjustment period, will not generate long-time frequency discontinuity.It is controlled by dichotomy and PI
Convergence rate, precision and the robustness of clock synchronization is greatly improved in the combination of module, to the high-precision of target clock frequency,
High robust, indifference synchronize.
To sum up, the present invention is using frequency and time synchronism calibration mode, therefore, can effectively reduce under original state terminal with
The time deviation of main website reduces terminal and logs in packet sending time deviation.The clock stability of synchronization and strong robustness, suitable for satellite
The communications field.
It should be noted that described above is only the preferred embodiment of the present invention, it should be understood that for art technology
For personnel, several changes and improvements can also be made under the premise of the technology of the present invention design is not departed from, these are included in
In protection scope of the present invention.
Claims (7)
1. a kind of satellite communication terminal digital dock synchronous method, which is characterized in that include the following steps：
According to the temporal information that main website continuously transmits in setting time interval, master clock and terminal digital dock are calculated
Difference on the frequency and a frequency adjusted value is calculated, and control eventually according to frequency adjusted value using frequency adjustment algorithm according to difference on the frequency
Digital dock output frequency is held, to realize the Frequency Synchronization with master clock；
It realizes to be added with the link delay of setting with newest master clock after the Frequency Synchronization of master clock, will be obtained and be led
It stands the time, and this time is loaded onto local zone time, realize the time synchronization of local zone time and master clock.
2. the satellite communication terminal digital dock synchronous method according to requiring 1, which is characterized in that frequency in the method
Lasting adjustment is synchronized, and time synchronization only carries out once.
3. the satellite communication terminal digital dock synchronous method according to requiring 1, which is characterized in that frequency tune in the method
Whole algorithm includes dichotomy and proportional plus integral control algorithm, wherein the dichotomy is used for control terminal digital dock output frequency
Frequency departure is restrained, proportional plus integral control algorithm control terminal number is switched to after the dichotomy adjustment number for reaching setting
Clock output frequency makes difference on the frequency be maintained in the levelling thickness range of setting.
4. satellite communication terminal digital dock synchronous method according to claim 1, which is characterized in that main in the method
The time interval that sets of standing is 30 to 64ms.
5. satellite communication terminal digital dock synchronous method according to claim 3, which is characterized in that set in the method
Fixed levelling thickness range is in the range of the 1ppm of master clock.
6. a kind of satellite communication terminal digital dock synchronizing device, which is characterized in that including：
Main station time acquisition module calculates main website for obtaining the temporal information that main website continuously transmits in setting time interval
The newest master clock of clock and main website after Frequency Synchronization；
Control module and numerical frequency conversion module are adjusted, wherein adjustment control module is used to obtain terminal digital dock and meter
Master clock and the difference on the frequency of terminal digital dock are calculated, calculating a frequency using frequency adjustment algorithm according to difference on the frequency adjusts
Value, and digital frequency transposition module is controlled to adjust terminal digital dock output frequency according to frequency adjusted value, to realize and master
It stands the Frequency Synchronization of clock；
Loading Control module, for according to the newest master clock that main station time acquisition module obtains and the link delay phase of setting
Add to obtain main station time, and this time is loaded onto local zone time, realize the time synchronization of local zone time and master clock.
7. satellite communication terminal digital dock synchronizing device according to claim 6, which is characterized in that the adjustment control
Module includes：Dichotomy control module and proportional plus integral control module, wherein dichotomy control module are for control terminal number
Clock output frequency restrains frequency departure, and proportional plus integral control module is switched to after the dichotomy adjustment number for reaching setting
Control terminal digital dock output frequency makes difference on the frequency be maintained in the levelling thickness range of setting.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711412159.4A CN108199799B (en) | 2017-12-23 | 2017-12-23 | A kind of satellite communication terminal digital dock synchronous method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711412159.4A CN108199799B (en) | 2017-12-23 | 2017-12-23 | A kind of satellite communication terminal digital dock synchronous method and device |
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| CN108199799A true CN108199799A (en) | 2018-06-22 |
| CN108199799B CN108199799B (en) | 2019-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711412159.4A Active CN108199799B (en) | 2017-12-23 | 2017-12-23 | A kind of satellite communication terminal digital dock synchronous method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112532309A (en) * | 2020-12-21 | 2021-03-19 | 四川安迪科技实业有限公司 | Physical layer transmission method and device suitable for simple satellite Internet of things terminal |
| CN113472429A (en) * | 2021-07-20 | 2021-10-01 | 中国人民解放军军事科学院国防科技创新研究院 | Distributed satellite system cooperative inter-satellite link spectrum sensing method |
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| CN104158616A (en) * | 2014-07-28 | 2014-11-19 | 京信通信***（中国）有限公司 | Clock synchronization method and device in optical fiber transmission system |
| CN105991205A (en) * | 2015-02-05 | 2016-10-05 | 于天泽 | Verifiable and adjustable full synchronous communication network, and implementation method thereof |
| CN106922015A (en) * | 2015-12-25 | 2017-07-04 | 联芯科技有限公司 | Wireless Telecom Equipment and its frequency synchronization method |
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| US20040156463A1 (en) * | 2003-02-11 | 2004-08-12 | Goodloe Anthony A. | System and method for recovering a payload data stream from a framing data stream |
| CN103346852A (en) * | 2013-05-29 | 2013-10-09 | 江汉大学 | Apparatus capable of providing reference clock signal |
| CN104158616A (en) * | 2014-07-28 | 2014-11-19 | 京信通信***（中国）有限公司 | Clock synchronization method and device in optical fiber transmission system |
| CN105991205A (en) * | 2015-02-05 | 2016-10-05 | 于天泽 | Verifiable and adjustable full synchronous communication network, and implementation method thereof |
| CN106922015A (en) * | 2015-12-25 | 2017-07-04 | 联芯科技有限公司 | Wireless Telecom Equipment and its frequency synchronization method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112532309A (en) * | 2020-12-21 | 2021-03-19 | 四川安迪科技实业有限公司 | Physical layer transmission method and device suitable for simple satellite Internet of things terminal |
| CN112532309B (en) * | 2020-12-21 | 2022-07-22 | 四川安迪科技实业有限公司 | Physical layer transmission method and device suitable for simple satellite internet of things terminal |
| CN113472429A (en) * | 2021-07-20 | 2021-10-01 | 中国人民解放军军事科学院国防科技创新研究院 | Distributed satellite system cooperative inter-satellite link spectrum sensing method |
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| CN108199799B (en) | 2019-09-03 |
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