CN106413075A - Clock synchronization method and system, and terminal station - Google Patents
Clock synchronization method and system, and terminal station Download PDFInfo
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- CN106413075A CN106413075A CN201510483653.4A CN201510483653A CN106413075A CN 106413075 A CN106413075 A CN 106413075A CN 201510483653 A CN201510483653 A CN 201510483653A CN 106413075 A CN106413075 A CN 106413075A
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- time
- wireless signal
- station
- end station
- time information
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- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
Abstract
The invention provides a clock synchronization method and system, and a terminal station, being applied to the communication field. The terminal station receives the wireless signal forwarded by a digital broadcast satellite, and the wireless signal includes the master station time information; the terminal station extracts the master station time information extracted from the wireless signal; and the terminal station is in clock synchronization with the master station based on the master station time information. Compared with the prior art, the synchronization is realized by directly carrying the master station time information in the wireless signal transmitted by the master station instead of a GPS, the clock synchronization of the master station and the terminal station can be realized by an actual modulation encoder and a receiving demodulation decoder based on the network communication of the master station and the terminal station, a GPS receiver is not needed, so that the cost is reduced; furthermore, the clock synchronization can be directly realized through the master station and the terminal station, the signal intensity is high, and the problem of weak GPS satellite high-altitude signal intensity is prevented.
Description
Technical field
The present invention relates to the communications field is and in particular to a kind of synchronous method and system of clock, end station.
Background technology
On the ship going to sea in ocean, go to sea for a long time and but need to keep communication with land, but due to marine environment
Restriction cannot use wire communication, can only be realized logical between terminal on ground and ship by satellite pass-through mode
Letter, is had multiple based on the base station of satellite communication, such as base transceiver station (Base Transceiver Station,
) or other types base station BTS.
BTS base station is a kind of based on multi-frequency time division multiple access (Multi Frequency Time Division
Multiple Access MF-TDMA) mode base station, in the work process of BTS base station, need keep
The clock synchronization of the clock of end station and main website or Frequency Synchronization, if the frequency departure between end station and main website is relatively
Greatly, then can cause frequency deviation, so that user cannot be accessed, or even the faults such as call drop, call time-out occur.At present
BTS base station is entered with row clock is synchronously using HA Global Positioning Satellite (Global Positioning System, GPS)
Receiver is realized, but enters row clock synchronous (Frequency Synchronization) using GPS and have the disadvantage that：Ensure GPS
Receiver normally uses, and receiving and coming from above the signal of sky at least three satellites is essential condition.Certainly
When needing synchronous, the crown certainly will not always " whole piece blue sky ", so signal intensity deficiency is GPS
One of hard defects.In BTS base station, GPS is installed, increased cost.
Content of the invention
The main technical problem to be solved in the present invention is to provide a kind of synchronous method and system of clock, end station,
Solve existing by GPS enter row clock synchronously need install GPS lead to high cost and signal intensity
Not poor problem.
For solving the above problems, the present invention provides a kind of clock synchronous method, including：
End station receives the wireless signal that main website is forwarded by digital broadcast satellite, and described wireless signal includes described
Main station time information；
Described end station extracts described main station time information from described wireless signal；
Described end station enters row clock synchronization according to described main station time information with described main website.
In an embodiment of the present invention, described main station time information includes：
Described main website sends the transmission time of described wireless signal to described digital broadcast satellite
Or
Described main station time information includes described main website and sends described wireless signal to described digital broadcast satellite
Transmission time and propagation delay time.
In an embodiment of the present invention, when described main station time information includes described main website to described numeral
When broadcasting satellite sends the transmission time of described wireless signal；Described end station is extracted from described wireless signal
Described main station time information includes：Described end station extracts described main station time information from described wireless signal
Described main website sends the transmission time of described wireless signal to described digital broadcast satellite；Described end station is according to institute
State main station time information and enter row clock synchronous package with described main website and include：Described end station obtains the propagation delay time；
Using described transmission time and described transmission delay sum as the synchronization criterion time；Basis by described end station
Ground set of time is the described synchronization criterion time.
In an embodiment of the present invention, when described main station time information includes described main website to described numeral
When broadcasting satellite sends transmission time and the propagation delay time of described wireless signal；Described end station is from described nothing
Extract described main station time information in line signal to include：Described end station extracts institute from described wireless signal
State main website described in main station time information to described digital broadcast satellite send described wireless signal the transmission time and
Propagation delay time；Described end station is entered row clock synchronous package according to described main station time information with described main website and is included：
Using described transmission time and described transmission delay sum as the synchronization criterion time；Basis by described end station
Ground set of time is the described synchronization criterion time.
In an embodiment of the present invention, the local zone time of described end station is being set to described synchronization criterion
Also included before time：Obtain the reception time receiving described wireless signal；Judge described reception time and institute
Whether identical state the synchronization criterion time；If it is different, then the local zone time of described end station is set to described same
The step standard time.
In an embodiment of the present invention, the data form of described wireless signal is Frame；Described data
Frame includes the data head that serial describes data/address bus；The described reception time bag obtaining the described wireless signal of reception
Include：Described end station is identified the described serial of output describes the time of the data head of data/address bus as described reception
Time.
In an embodiment of the present invention, the data form of described wireless signal is Frame；Described data
Frame includes the data subject of the valid data on data/address bus；Described end station is extracted from described wireless signal
Described main station time information includes：The data subject parsing of the valid data from described data/address bus obtains institute
State main station time information.
For solving the above problems, the present invention also provides a kind of clock synchronous method, including：
To end station, described wireless signal includes described master to the wireless signal that main website is forwarded by digital broadcast satellite
Stand temporal information；
Described end station receives described wireless signal；
Described end station extracts described main station time information from described wireless signal；
Described end station enters row clock synchronization according to described main station time information with described main website.
For solving the above problems, the present invention also provides a kind of end station, including sending module, extraction module and with
Step module：
Described sending module is used for receiving the wireless signal that main website is forwarded by digital broadcast satellite, described wireless
Signal includes described main station time information；
Described extraction module is used for extracting described main station time information from described wireless signal；
Described synchronization module is used for entering row clock synchronization according to described main station time information with described main website.
In an embodiment of the present invention, described main station time information includes：
Described sending module sends the transmission time of described wireless signal to described digital broadcast satellite
Or
Described main station time information includes described sending module and sends described wireless communication to described digital broadcast satellite
Number the transmission time and the propagation delay time.
In an embodiment of the present invention, when described main station time information includes described main website to described numeral
When broadcasting satellite sends the transmission time of described wireless signal；Described extraction module is additionally operable to from described wireless communication
Extract main website described in described main station time information in number and send described wireless signal to described digital broadcast satellite
The transmission time；Described synchronization module is additionally operable to obtain the propagation delay time；By described transmission time and described
Transmission delay sum is as the synchronization criterion time；The local zone time of described end station is set to described synchronization
Standard time.
In an embodiment of the present invention, when described main station time information includes described main website to described numeral
When broadcasting satellite sends transmission time and the propagation delay time of described wireless signal；Described extraction module is also used
Send out to described digital broadcast satellite in extracting main website described in described main station time information from described wireless signal
Send transmission time and the propagation delay time of described wireless signal；Described synchronization module is additionally operable to described transmission
Time and described transmission delay sum are as the synchronization criterion time；Local zone time setting by described end station
For the described synchronization criterion time.
In an embodiment of the present invention, described synchronization module is additionally operable to by the local zone time of described end station
Before being set to the described synchronization criterion time, obtain the reception time receiving described wireless signal；Judge described
Whether the reception time is identical with the described synchronization criterion time；If it is different, then the local zone time by described end station
It is set to the described synchronization criterion time.
For solving the above problems, the present invention also provides a kind of synchronous system of clock it is characterised in that including
Main website and end station：
Described main website is used for the wireless signal forwarding by digital broadcast satellite to described end station, described wireless communication
Number include described main station time information；
Described end station is used for receiving described wireless signal, extracts described main station time from described wireless signal
Information；And row clock synchronization is entered with described main website according to described main station time information.
The invention has the beneficial effects as follows：
The method and system of clock synchronization of present invention offer, end station, end station receives main website and passes through digital broadcasting
The wireless signal that satellite forwards, wireless signal includes main station time information；End station is extracted from wireless signal
Main station time information；End station enters row clock synchronization according to main station time information with main website.Compared with prior art,
Do not need to synchronize by GPS, but directly main station time information is carried the wireless communication sending in main website
In number, network service actual modulated encoder can be carried out with end station based on main website and just receive demodulating and decoding device
The clock being capable of main website and end station is synchronous, it is to avoid need to install GPS, being capable of reduces cost；
Further, row clock synchronization is directly entered with end station by main website, signal intensity is good, it can be avoided that gps satellite
The weak problem of signal intensity that high-altitude is brought.
Brief description
The method flow diagram of the clock synchronization that Fig. 1 provides for the embodiment of the present invention one；
The method flow diagram of the clock synchronization that Fig. 2-1 provides for the embodiment of the present invention two；
The frame structure schematic diagram of the frame in the method for the clock synchronization that Fig. 2-2 provides for the embodiment of the present invention two；
Tuner and demodulation in end station in the method for the clock synchronization that Fig. 2-3 provides for the embodiment of the present invention two
The connection signal of device chip；
Flows of data signals is parsed in end station in the method for the clock synchronization that Fig. 2-4 provides for the embodiment of the present invention two
Cheng Tu；
Serial in the method for the clock synchronization that Fig. 2-5 provides for the embodiment of the present invention two describes data/address bus output
The time sequencing schematic diagram of signal；
In the synchronous method of clock that Fig. 2-6 provides for the embodiment of the present invention two data/address bus output signal when
Between sequential schematic；
Form the stream of synchronised clock sequence for the embodiment of the present invention two in the method for the clock synchronization that Fig. 2-7 provides
Cheng Tu；
The end station structural representation that Fig. 3 provides for the embodiment of the present invention three；
The system structure diagram of the clock synchronization that Fig. 4 provides for the embodiment of the present invention three.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, below in conjunction with the present invention
Accompanying drawing in embodiment, the technical scheme in the embodiment of the present invention is clearly and completely described it is clear that
Described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based in the present invention
Embodiment, those of ordinary skill in the art obtained under the premise of not making creative work all its
His embodiment, broadly falls into the scope of protection of the invention.
Embodiment one：
The synchronous method of the clock of the embodiment of the present application, as shown in figure 1, the method includes：
S101：End station receives the wireless signal that main website is forwarded by digital broadcast satellite, and wireless signal includes leading
Stand temporal information；
In this step, digital broadcast satellite here generally refers to using as DVB-S (Digital Video
Boradcasting System for satellite broadcasting), and make bandwidth usage more effective
DVB-S2 (second generation DVB System for satellite broadcasting and
Unicasting the satellite) being transmitted, wireless signal here is primarily referred to as regarding by satellite transmission high-quality
Frequency and the wireless signal of high-level service, main station time information here is to refer to enter row clock synchronization for end station
All times.Preferably, main station time information includes the time that main website sends wireless signal.Will send
The time of wireless signal carries in wireless signal, allows end station can enter row clock according to this time here same
Step.Specifically, due to there being certain time delay between end station and main website, end station is obtaining sending wireless communication
Number time after must know his time delay and main website between, this general time delay is to be relatively fixed
Value, end station according to sending time of wireless signal and this delay time can be obtained by the time of a synchronization,
Just local clock was synchronized according to this synchronous time.Further, when directly carrying out for the ease of end station
Clock is synchronous, and main station time information also includes the time delay that wireless signal reaches end station, directly will send no
The time of line signal and time delay all carry in wireless signal, allow end station directly obtain when carrying out follow-up
Clock is synchronous.Here wireless signal refers to the various signals that can carry main station time information, specific nothing
The data form of line data signal can be data message, packet data frame etc..
S102：End station extracts main station time information from wireless signal；
In this step, because main station time information carries in wireless signal, then specifically obtain
This main station time information must be processed to wireless signal, obtains corresponding main station time information.Specifically, by
Pass through gateway accessing the Internet in ground main website, in main website, original data message is packaged into DVB-S2
Form, through modulators modulate to and the corresponding frequency of satellite, main website produce radiofrequency signal issued by antenna
Satellite repeater, signal amplifies through transponder, is transmitted to the end station on ship；End station receives radiofrequency signal
Become baseband signal through down coversion, be then passed through demodulating and decoding and recover original data.I.e. as right
Require the method for 1 clock synchronization it is characterised in that end station reception main website is forwarded by digital broadcast satellite
Wireless signal include：End station receives main website and forwards wireless signal corresponding radio frequency letter by digital broadcast satellite
Number；Radiofrequency signal is carried out signal conversion processes and obtains corresponding digital quadrature signal by end station；End station is to numeral
Orthogonal signalling obtain corresponding wireless signal after being demodulated decoding.Wireless signal includes having on data/address bus
The data subject of effect data；The data subject of the valid data on data/address bus includes main station time information；End
Parsing wireless signal of standing obtains main station time information and includes：From the data subject solution according to the valid data bus
Analysis obtains main station time information.
S103：End station enters row clock synchronization according to main station time information with main website.
In this step, can be specifically directly to be carried out according to the local clock of main station time information distance station
Clock is synchronous；I.e. no matter whether local clock malfunctions, all carry out synchronizing with the clock of main website.Thus
May there is in a large number simultaneously operating, in order to reduce the process of this part it is preferred that also to be first to judge
Whether the local clock of end station is identical with master clock, such as differs, then enter row clock synchronous.That is
Only it is, in the case of master clock is nonsynchronous, just local clock is entered with row clock synchronization process.Specifically,
Judge the local clock inclusion whether identical with master clock of end station：Obtain the reception time receiving wireless signal；
Judge whether institute's local clock is identical with master clock according to main station time information with the time of reception.Further,
Because, in normal handling process, the process that end station is also performed to correlation after receiving wireless signal just can be had
The main station time information of body, has certain delay during managing in this place, and the time of this delay is difficult to
Determine, in order to accurately determine the concrete reception time receiving wireless signal, reduce error in judgement it is preferred that
Wireless signal includes the data head that serial describes data/address bus；The reception time obtaining reception wireless signal includes：
End station is identified output serial describes the time of the data head of data/address bus as the reception time.I.e. due to end station
After receiving wireless signal, just can identify that output serial describes the data head of data/address bus at once, not follow-up
Processing procedure, thus can determine the time specifically receiving wireless signal, other can determine certainly very well
The mode of the time of wireless signal can also be realized.
Further, it is synchronous that is to say, that main website meeting to constantly ensure the clock between main website and end station
The wireless signal constantly being forwarded by digital broadcast satellite is to end station it is preferred that allowing main website according to predetermined period
By the continuous wireless signal forwarding of digital broadcast satellite to end station, herein for the expense reducing physical layer,
The purpose of Network Synchronization can be reached, main website is to send with 80 milliseconds for predetermined period to carry main station time information again
Wireless signal.So end station is exactly periodically to obtain these wireless signals, for the ease of wireless to these
Signal corresponding main station time information carries out follow-up time synchronization it is preferred that forming synchronised clock sequence；Tool
Body, forming synchronised clock sequence according to how many wireless signals can be that each wireless signal also includes serial description
The data subject of the valid data in the data subject data bus of data/address bus；Serial describes data/address bus
Data subject include the first physics frame counter；The data subject of the valid data on data/address bus includes
Two physics frame counters and main station time information；Form synchronised clock sequence according to how many wireless signals to include：
Queue is formed according to the first physics frame counter of each wireless signal；Found according to each first physics frame counter
Corresponding each second physics frame counter；Found on corresponding data/address bus according to each second physics frame counter
Valid data data subject, when extracting each main website from the data subject of the valid data data/address bus
Between information formed synchronised clock sequence.For example, this wireless signal is Frame, then receive demodulation in end station
Before decoding, frame head part SOF that detection reaches, then from frame data partly middle parsing main station time information
NCR, has been known that the synchronized timestamp of main website, and the NCR information corresponding SOF sequence that the cycle receives forms one
Individual stable synchronised clock sequence, then we just can process synchronization as general base station, and this is same
Step clock sequence is delivered to phaselocked loop and is calibrated it is possible to be replaced GPS, realizes and main website keeps clock synchronization
Purpose.
Specifically, main station time information includes：Main website to digital broadcast satellite send wireless signal transmission when
Between or main station time information include that main website sends transmission time of wireless signal to digital broadcast satellite and transmission is prolonged
Time late.
When main station time information includes the transmission time that main website sends wireless signal to digital broadcast satellite；End
Stand and extract main station time information from wireless signal and include：End station extracts main station time from wireless signal
Information main website sends the transmission time of wireless signal to digital broadcast satellite；End station according to main station time information with
Main website enters row clock synchronous package and includes：End station obtains the propagation delay time；The time that will send is added with transmission delay
Sum is as the synchronization criterion time；The local zone time of end station is set to the synchronization criterion time.
When main station time information includes transmission time and the transmission that main website sends wireless signal to digital broadcast satellite
During time delay；End station is extracted main station time information from wireless signal and is included：End station is from wireless signal
Extract transmission time and the transmission delay that main station time information main website sends wireless signal to digital broadcast satellite
Time；End station is entered row clock synchronous package according to main station time information with main website and is included：Transmission time and transmission are prolonged
Sum is as the synchronization criterion time late；The local zone time of end station is set to the synchronization criterion time.
Further, also included before the local zone time of end station is set to the synchronization criterion time：Obtain and receive
The reception time of wireless signal；Judge whether the reception time is identical with the synchronization criterion time；If it is different, then
The local zone time of end station is set to the synchronization criterion time.
Specifically, the data form of wireless signal is Frame；Frame includes serial and describes data/address bus
Data head；The reception time obtaining reception wireless signal includes：End station is identified that output serial describes data total
The time of the data head of line is as the time of reception.
Specifically, the data form of wireless signal is Frame；Frame includes the significant figure on data/address bus
According to data subject；End station is extracted main station time information from wireless signal and is included：From data/address bus
The data subject parsing of valid data obtains main station time information.
Embodiment two：
The synchronous method of the clock of the embodiment of the present application, as shown in Fig. 2-1, the method includes：
S201：The wireless signal that main website forwards periodically through digital broadcast satellite, this wireless signal includes leading
Stand temporal information；
In this step, specifically, through modulating-coding and after encapsulating in main website taking Frame as a example
As shown in Fig. 2-2, frame head part is divided into SOF section and PLSC (Physical LayerSignaling to DVB-S2 frame
Code) section, wherein XFECFRAME (complex Forward Error Correction Frame) represent number
According to part.Frame head has 90 symbol compositions, and wherein SOF occupies 26 symbols, is converted into hexadecimal
It is 18D2E82HEX, this one piece of data information is changeless in DVB-S2 agreement, for DVB-S2
This feature of protocol frame format, we can be network clock reference NCR (Network Clock in main website
Reference) it is encapsulated in inside XFECFRAME, and the transmission in cycle carries the Frame of NCR.Here
Network clock reference is a kind of specific example of main station time information, and certainly other clock informations can also.
S202：End station receives wireless signal, and obtains main station time information according to the parsing of this digital signal, and
Form synchronised clock sequence；
S203：End station carries out synchronous with the clock of main website according to synchronised clock sequence.
In above-mentioned steps S202, specifically, on receiving end station, we used independent tuner Tuner
With demodulation chip Demod, shown in 2-3, it is the connection signal of tuner and demodulator chip in end station.Here
Recommend to add STV0910ADB chipset, peripheral control unit using the STV6111B of ST Microelectronics
UController and Tuner and Demod is to enter according to I2C (Inter-Integrated Circuit) agreement
Row communication.The radiofrequency signal that Tuner is responsible for that antenna is received is moved near zero-frequency, then orthogonal simulating
IQ (Inphase and Quadrature) signal gives Demod.The handling process of whole Demod is by Fig. 2-4
Shown, it is that wireless signal flow chart is parsed on end station in the synchronous method of clock, be specifically to parse in end station
And mate serial and describe in data SDD (Serial data description) bus SOF data bus
The flow process of valid data, inside Demod, simulation I/Q signal is through analog-digital converter
ADC (Analog-to-Digital Converter) sampling, quantization are converted into digital I/Q signal, are then passed through
Demodulation, decoding, finally defeated in data/address bus by transmission stream management module Transport stream manager
Go out original Frame, data/address bus includes the number of output timing CLKOUT, valid data on data/address bus
Data subject DATA according to the valid data on STROUT, D/P, data/address bus etc., wherein, data/address bus
On data STROUT of valid data in comprise the data head STROUT_SOF of valid data on data/address bus
Specific sequential chart is as shown in Figure 2-5.
In order to correctly make Demod output SOF, we can be by configuring universal input output in Fig. 2-3
GPIO (General Purpose Input Output) switching matrix, selects fixing GPIO pin as SDD
Bus export, SDD bus export serial describe data/address bus data head SDD_SOF, Symbol Clock and
Serial describes data subject SD_data of data/address bus, and SDD bus-out signal sequential is as shown in figures 2-6.
Because wireless signal is transmitted into satellite from main website, receive to end station again from satellite, pilot process has biography
Broadcast time delay.In addition, in receiving terminal processing procedure, Tuner and Demod inter-process also brings along hardware computation
Time delay it is intended that it is a fixed value that all time delays add up, such end station deals with and will not introduce
Too big error.
Comparison diagram 2-5 and Fig. 2-6, it is significant to note that, data/address bus STROUT also has mark initial
The STROUT_SOF of frame, it represents that whole DVB-S2 Frame is demodulated and decoding just exports, and
SOF in SDD bus is that DVB-S2 data head is identified to be exported, not through demodulation decoding below
Process.It is known that DVB-S2 supports that range of code rates, from 1/4 to 9/10, supports QPSK, 8PSK, 16PSK
With tetra- kinds of demodulation modes of 32APSK, different code checks and demodulation mode combination the time spent all change.If I
Regard Timing Synchronization clock source using the SOF on STROUT, because the physics frame length under different code checks is different,
Different demodulation modes cause to process and postpone not fix, and the moment point so reaching is not just a fixed value, institute
Synchronously must be with the SOF output in SDD bus with clock.
Main website transmitting terminal, SOF data XFECFRAME on single frame is one-to-one, but at end
Stand receiving terminal, the data head SDD_SOF that serial describes data/address bus is output in SDD bus, data is
Data/address bus DATA exports, the SOF data output time of same frame also has deviation, SOF is first always
In data, there is not dislocation it has been found that SD_data data bus Data in order to ensure SOF data
There is an instruction to currently belong to the enumerator PLFRAME_counter of which physical frame, this two fields are carried
Take out, then compare it can be determined that whether serial describes data head SDD_SOF and DATA of data/address bus
It is same frame, specifically as illustrated in figs. 2-7, including：
Step S2021：Open up two pieces of sufficiently large caching Buffer, constantly collect SDD_SOF, SD_data
And STROUT and DATA on data/address bus；
Specifically, Buffer0 reads SOF, the SD_data in SDD bus；Buffer1 readout data bus
On STROUT_SOF, DATA.
Step S2022：Obtain the precise moments of frame arrival from the timestamp of SDD_SOF, extract in SD_data
The first physical frame enumerator PLFRAME_couter1, exist in queue；
Step S2023：After data/address bus detects STROUT_SOF, get data from DATA, and extract bag
It is contained in the enumerator PLFRAME_couter2 of the second physical frame in DATA；
Step S2024：PLFRAME_couter1 relatively in PLFRAME_couter2 and queue, if greatly
Little equal, being judged as is same frame, if two PLFRAME_couter have difference, according to difference in queue
Mobile corresponding step-length, finds current data corresponding SDD_SOF in queue.
Embodiment three：
The embodiment of the present application provides a kind of end station 300, as shown in figure 3, including sending module 301, extracting mould
Block 302 and synchronization module 303：Sending module 301 is used for receiving the nothing that main website is forwarded by digital broadcast satellite
Line signal, wireless signal includes main station time information；Extraction module 302 is used for extracting from wireless signal
Main station time information；Synchronization module 303 is used for entering row clock synchronization according to main station time information with main website.
Specifically, main station time information includes：Sending module sends sending out of wireless signal to digital broadcast satellite
Time or main station time information is sent to include the transmission time that sending module sends wireless signal to digital broadcast satellite
And the propagation delay time.
Specifically, when main station time information includes the transmission that main website sends wireless signal to digital broadcast satellite
Between when；Extraction module 302 is additionally operable to extract main station time information main website from wireless signal to digital broadcasting
Satellite sends the transmission time of wireless signal；Synchronization module 303 is additionally operable to obtain the propagation delay time；To send out
Send time and transmission delay sum as the synchronization criterion time；The local zone time of end station is set to synchronization
Standard time.
Specifically, when main station time information includes the transmission that main website sends wireless signal to digital broadcast satellite
Between and during the propagation delay time；Extraction module is additionally operable to extract main station time information main website from wireless signal
Send transmission time and the propagation delay time of wireless signal to digital broadcast satellite；Synchronization module be additionally operable to by
Transmission time and transmission delay sum are as the synchronization criterion time；The local zone time of end station is set to same
The step standard time.
Further, synchronization module 303 be additionally operable to by the local zone time of end station be set to the synchronization criterion time it
Before, obtain the reception time receiving wireless signal；Judge whether the reception time is identical with the synchronization criterion time；
If it is different, then the local zone time of end station is set to the synchronization criterion time.
The embodiment of the present application provides a kind of clock synchronous system, including main website 400 and end station 300：
Main website 400 is used for the wireless signal forwarding by digital broadcast satellite to end station 300, and wireless signal includes
Main station time information；
End station 300 is used for receiving wireless signal, extracts main station time information from wireless signal；And root
Enter row clock synchronization according to main station time information with main website.
One of ordinary skill in the art will appreciate that all or part of step in said method can by program Lai
Instruction related hardware completes, and said procedure can be stored in computer-readable recording medium, such as read-only storage
Device, disk or CD etc..Alternatively, all or part of step of above-described embodiment can also using one or
Multiple integrated circuits are realizing.Correspondingly, each module/unit in above-described embodiment can adopt the shape of hardware
Formula is realized, it would however also be possible to employ the form of software function module is realized.The present invention is not restricted to any particular form
Hardware and software combination.
Above example only in order to technical scheme to be described and unrestricted, reference only to preferred embodiment
The present invention has been described in detail.It will be understood by those within the art that, can be to the present invention's
Technical scheme is modified or equivalent, without deviating from the spirit and scope of technical solution of the present invention, all
Should cover in the middle of scope of the presently claimed invention.
Claims (14)
1. a kind of synchronous method of clock is it is characterised in that include：
End station receives the wireless signal that main website is forwarded by digital broadcast satellite, and described wireless signal includes described
Main station time information；
Described end station extracts described main station time information from described wireless signal；
Described end station enters row clock synchronization according to described main station time information with described main website.
2. the synchronous method of clock as claimed in claim 1 is it is characterised in that described main station time
Information includes：
Described main website sends the transmission time of described wireless signal to described digital broadcast satellite
Or
Described main station time information includes described main website and sends described wireless signal to described digital broadcast satellite
Transmission time and propagation delay time.
3. the synchronous method of clock as claimed in claim 2 is it is characterised in that when described main website
Between information include described main website to described digital broadcast satellite send described wireless signal the transmission time when；Institute
State end station and extract described main station time information from described wireless signal and include：Described end station is from described wireless
Extract main website described in described main station time information in signal and send described wireless communication to described digital broadcast satellite
Number the transmission time；Described end station is entered row clock synchronous package according to described main station time information with described main website and is included：
Described end station obtains the propagation delay time；Using described transmission time and described transmission delay sum as together
The step standard time；The local zone time of described end station is set to the described synchronization criterion time.
4. the synchronous method of clock as claimed in claim 2 is it is characterised in that when described main website
Between information include described main website and send transmission time of described wireless signal and transmission to described digital broadcast satellite
During time delay；Described end station is extracted described main station time information from described wireless signal and is included：Described
End station extracts main website described in described main station time information to described digital broadcast satellite from described wireless signal
Send transmission time and the propagation delay time of described wireless signal；Described end station is believed according to described main station time
Breath enters row clock synchronous package with described main website and includes：Described transmission time and described transmission delay sum are made
For the synchronization criterion time；The local zone time of described end station is set to the described synchronization criterion time.
5. the synchronous method of clock as described in claim 3 or 4 is it is characterised in that will be described
The local zone time of end station also includes before being set to the described synchronization criterion time：Obtain and receive described wireless signal
The reception time；Judge whether the described reception time is identical with the described synchronization criterion time；If it is different, then
The local zone time of described end station is set to the described synchronization criterion time.
6. the synchronous method of clock as claimed in claim 5 is it is characterised in that described wireless signal
Data form be Frame；Described Frame includes the data head that serial describes data/address bus；Described acquisition
The reception time receiving described wireless signal includes：Described end station is identified that the described serial of output describes data total
The time of the data head of line is as the described reception time.
7. the synchronous method of clock as claimed in claim 1 is it is characterised in that described wireless signal
Data form be Frame；Described Frame includes the data subject of the valid data on data/address bus；Institute
State end station and extract described main station time information from described wireless signal and include：From described data/address bus
The data subject parsing of valid data obtains described main station time information.
8. a kind of synchronous method of clock is it is characterised in that include：
To end station, described wireless signal includes described master to the wireless signal that main website is forwarded by digital broadcast satellite
Stand temporal information；
Described end station receives described wireless signal；
Described end station extracts described main station time information from described wireless signal；
Described end station enters row clock synchronization according to described main station time information with described main website.
9. a kind of end station is it is characterised in that include sending module, extraction module and synchronization module：
Described sending module is used for receiving the wireless signal that main website is forwarded by digital broadcast satellite, described wireless
Signal includes described main station time information；
Described extraction module is used for extracting described main station time information from described wireless signal；
Described synchronization module is used for entering row clock synchronization according to described main station time information with described main website.
10. end station as claimed in claim 9 is it is characterised in that described main station time information includes：
Described sending module sends the transmission time of described wireless signal to described digital broadcast satellite
Or
Described main station time information includes described sending module and sends described wireless communication to described digital broadcast satellite
Number the transmission time and the propagation delay time.
11. end station as claimed in claim 10 are it is characterised in that when described main station time information includes institute
When stating the transmission time that main website sends described wireless signal to described digital broadcast satellite；Described extraction module is also
For extracting main website described in described main station time information from described wireless signal to described digital broadcast satellite
Send the transmission time of described wireless signal；Described synchronization module is additionally operable to obtain the propagation delay time；By institute
State transmission time and described transmission delay sum as the synchronization criterion time；By described end station local when
Between be set to the described synchronization criterion time.
12. end station as claimed in claim 10 are it is characterised in that when described main station time information includes institute
When stating transmission time and the propagation delay time that main website sends described wireless signal to described digital broadcast satellite；
Described extraction module is additionally operable to extract main website described in described main station time information from described wireless signal to institute
State transmission time and the propagation delay time that digital broadcast satellite sends described wireless signal；Described synchronization module
It is additionally operable to described transmission time and described transmission delay sum as the synchronization criterion time；By described end
The local zone time stood is set to the described synchronization criterion time.
13. as described in claim 11 or 12 terminal it is characterised in that described synchronization module is additionally operable to
Before the local zone time of described end station is set to the described synchronization criterion time, obtains and receive described wireless communication
Number the reception time；Judge whether the described reception time is identical with the described synchronization criterion time；If it is different,
Then the local zone time of described end station is set to the described synchronization criterion time.
A kind of synchronous system of 14. clocks is it is characterised in that include main website and end station：
Described main website is used for the wireless signal forwarding by digital broadcast satellite to described end station, described wireless communication
Number include described main station time information；
Described end station is used for receiving described wireless signal, extracts described main station time from described wireless signal
Information；And row clock synchronization is entered with described main website according to described main station time information.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510483653.4A CN106413075B (en) | 2015-08-03 | 2015-08-03 | Method and system for clock synchronization and end station |
| PCT/CN2016/074128 WO2016165476A1 (en) | 2015-08-03 | 2016-02-19 | Clock synchronization method and system, end station and computer storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510483653.4A CN106413075B (en) | 2015-08-03 | 2015-08-03 | Method and system for clock synchronization and end station |
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| Publication Number | Publication Date |
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| CN106413075A true CN106413075A (en) | 2017-02-15 |
| CN106413075B CN106413075B (en) | 2020-04-28 |
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| CN201510483653.4A Active CN106413075B (en) | 2015-08-03 | 2015-08-03 | Method and system for clock synchronization and end station |
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| CN (1) | CN106413075B (en) |
| WO (1) | WO2016165476A1 (en) |
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| CN106452642A (en) * | 2015-08-07 | 2017-02-22 | 中兴通讯股份有限公司 | Satellite communication network clock synchronization method and device and base transceiver station |
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| CN109075882A (en) * | 2017-07-31 | 2018-12-21 | 深圳市大疆创新科技有限公司 | Synchronous method, equipment and system |
| CN109644240A (en) * | 2017-07-11 | 2019-04-16 | 深圳市柔宇科技有限公司 | Image pickup method and terminal |
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| CN111512588A (en) * | 2017-10-24 | 2020-08-07 | 天波网络有限责任公司 | Clock synchronization when switching between broadcast and data transfer modes |
| CN113708876A (en) * | 2021-08-24 | 2021-11-26 | 四川安迪科技实业有限公司 | Forward link time synchronization method of low-orbit satellite TDMA communication system |
| CN113840370A (en) * | 2021-08-31 | 2021-12-24 | 全球能源互联网欧洲研究院 | Clock synchronization method and device for wireless communication interaction and electronic equipment |
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| CN110830411B (en) * | 2019-09-27 | 2020-11-13 | 中国电子科技集团公司第二十九研究所 | Satellite multi-carrier demodulator facing MF-TDMA |
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| CN111512588A (en) * | 2017-10-24 | 2020-08-07 | 天波网络有限责任公司 | Clock synchronization when switching between broadcast and data transfer modes |
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| CN113708876A (en) * | 2021-08-24 | 2021-11-26 | 四川安迪科技实业有限公司 | Forward link time synchronization method of low-orbit satellite TDMA communication system |
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| CN113840370A (en) * | 2021-08-31 | 2021-12-24 | 全球能源互联网欧洲研究院 | Clock synchronization method and device for wireless communication interaction and electronic equipment |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106413075B (en) | 2020-04-28 |
| WO2016165476A1 (en) | 2016-10-20 |
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