CN107809295B - A kind of cross-platform time synchronism apparatus and method - Google Patents
A kind of cross-platform time synchronism apparatus and method Download PDFInfo
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- CN107809295B CN107809295B CN201711078787.3A CN201711078787A CN107809295B CN 107809295 B CN107809295 B CN 107809295B CN 201711078787 A CN201711078787 A CN 201711078787A CN 107809295 B CN107809295 B CN 107809295B
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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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- 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
- H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
Abstract
The invention discloses a kind of cross-platform time synchronism apparatus and methods, it is characterized in that passing through the communication links such as point-to-point radio station or IP network, at least each platform itself time-frequency equipment will be combined by two cross-platform time synchronism apparatus, and a synchronization system is formed with respective data transmission equipment, split-second precision is consistent between realizing different platform；Common-view mode is passed using number and high-performance tames clock technology, is changed original time-frequency equipment and is only focused on providing timing signal, the mode of high-precision homophase frequency reference signal can not be provided in real time；The accuracy correction realized between two units is compared using wireless two-way, and tames clock using high-performance and realizes that the time service ability of each isolated node and high-precision frequency marking export, to transform original pyramid structure as distributed video structure.Any one node failure can obtain high-precision markers and frequency marking from another node by distributed time-frequency network.It can effectively solve the split-second precision reunification under no satellite time transfer signal condition between different motion platform, military significance, economic benefit are obvious.
Description
Technical field
The invention belongs to naval vessel information systems technology fields, and in particular to a kind of method for synchronizing time and device.
Background technique
Time synchronization is one of primary demand of electronic information, is especially led in high-performance calculation, military project, telecommunications etc.
Domain.With the development of information technology, Long baselines include cross-platform information sharing, cooperate to different platform different geographical
More stringent requirements are proposed for the precise synchronization of electronic information.Precision ranging and other professional high precision measuring systems
Time synchronization requires musec order, and cooperative air-defense precision strike system requirements synchronization accuracy is in 100ns magnitude.
Existing electronic information heavy dependence satellite time transfer, but under real operational environment, satellite navigation time service positioning
System usually occurs under the mal-condition of no external satellite navigation signal usually primarily by the point of attack, can only lean on autonomous
High-precision Time and frequency standard is maintained, due to lacking unified time reference, it is difficult to guarantee between different zones, different platform
The precise synchronization of electronic information is realized and is cooperated.
Summary of the invention
The technical problem to be solved by the present invention is solve when the external time service source such as satellite receives interference, be unable to monitor and
Calibrate the time consistency problem between different platform.It provides a kind of when being suitable for cross-platform between different platform (ship, bank, machine etc.)
Between synchronous method and a kind of cross-platform time synchronism apparatus, realize height independent of external time service source between different motion platform
Precision time synchronization (static synchronous precision is better than 100ns, and dynamic synchronization precision is better than 1 μ s).
In order to solve the above technical problems, the present invention takes following technical scheme:
A kind of cross-platform time synchronism apparatus, it is characterised in that specifically include that
Time difference signal is fed to the general time difference by agreement and signal conversion, conditioning by general time difference comparing unit, outside
Comparing unit carries out real-time resolving；
Data combination unit carries out comprehensive solution to the basic measurement data of the general each comparing unit of time difference comparing unit
It calculates, built-in master clock algorithm, efficient time difference processing, update information output may be implemented；Other multiple units are carried out simultaneously
Comprehensive coordinated management；
Clock unit is tamed, after the high-precision timing signal for receiving external time source, starting internal accuracy monitoring is isolated outer
The jitter error of portion's time source, while the timing signal after preferably is sent into high precision time interval counter, with taming clock sheet
Ground divides second progress time difference comparison, and comparison result and accuracy monitoring value are sent into error handling units together, are filtered by high-performance
Algorithm realizes the separation to drift, jitter error, output error correction amount；The amendment of the Realtime Prediction of the correction amount and Allan variance
Amount is used to control together accurate difference correction and high-precision sequential machine, realizes to local frequency dividing second and local rate-adaptive pacemaker
Real-time compensation amendment, to export accurately time and frequency standards signal；
Digital frequency division clock generates and each when frequency standard signal is walked when steady using the height of taming clock unit output for time-code
Kind frequency standard signal, which generates, provides various reference signals；
Phase microstepper realizes accurate difference/TEC time error correction；
Time frequency signal expanding element, for meeting various types of signaling interface requirements, realizing signal condition and numbering defeated
Signal format out；
Network monitor interface, for remotely carrying out online management to cross-platform time synchronism apparatus.
Further, above-mentioned general time difference comparing unit includes:
IP network comparing unit turns IP mode by time-code, using customized synchronization packets, realizes the principal and subordinate in net
Time difference transmitting, by the data combination of multiple nodes, realizes that networking time accuracy is same to realize two-way time synchronization
Step；
Wireless channel comparing unit transmits simple time-code using FM, AM mode, realizes point-to-point or point to multi--point
The two-way mutual biography of time-code, to realize precise synchronization；
Satellite common vision comparing unit compares receiver unit by satellite common vision, when realizing the precision for being directed to GNSS satellite
Between compare.
Further, general time difference comparing unit is all made of FPGA+DSP frame.
Further, data combination unit includes that signal and message processing module, data combination module and interface realize three
A part；Mainly constituted using DSP, floating-point signal processor and FPGA frame；Floating-point signal processor includes 2
Fixed point arithmetic logic unit, 4 floating-point arithmetic logic units, 2 multipliers, 300MHz clock rate, 2400MIPS are 8 total
Independent functional unit.
A kind of cross-platform method for synchronizing time based on cross-platform time synchronism apparatus, it is characterised in that pass through point-to-point electricity
At least two cross-platform time synchronism apparatus are combined each platform itself time-frequency equipment by the communication links such as platform or IP network, and with
Respective data transmission equipment forms a synchronization system, and split-second precision is consistent between realizing different platform；Specifically comprise the following steps:
(1) it initializes；
(2) local clock state is set as host node, constructs synchronization packets, subsequent data packet, and fixed intervals issue；
(3) data packet on network is monitored, calls best master node modular algorithm to judge the state of local clock.
(4) it is judged as host node, then continues periodically to send same step number into network according to set time interval
According to packet and subsequent data packet；The delay request data package sent from node is received, then replys delay request-reply data packet；
(5) be judged as from node, then send delay request data package, receive delay request-reply data packet and calculate from
The reporting of node and host node is adjusted the time of local clock；
(6) from node starting receives overtime timer when, if local clock port does not receive it within the set time
The data packet that his clock is sent, then the pressure of the state of local clock will be set as primary node status by system, send number to network
According to packet.
The principle of the present invention is as follows:
(1) digitlization of time scale information, approach is mainly the record for the precise marking time sending and receiving the time, and is chased after
Add record information, one " timestamp " is increased to each information.Receiving end can calculate oneself clock in the channel
Error and delay.
(2) best master node algorithm adapts to distributed time-frequency framework.
The host node of clock is regular, and interval can be 10Hz, 1Hz, 0.1Hz etc., is spaced stringent synchronization.It is (same to send information
Step data packet) timestamp is contained, describe accurately the scheduled time of data packet sending.And to practical sending time into
Row measurement, marks in next synchronization packets；Receiving end obtains really connecing for synchronization packets in the way of physical measurement
Between time receiving, receiving end can use the true sending time of the acquisition in received next synchronization packets, after carrying out operation,
The time difference between slave clock and host node can be calculated, and corrects the time of slave node accordingly.But it calculates at this time
The time difference contain delay caused by network transmission.By repeatedly receiving, maximum Likelihood is used, to calculate biography
Defeated delay and clocking error.
(3) two-way precise time compares
Most accurate match time when being transmitted and receive based on synchronization packets, each from node by with host node
It exchanges synchronization packets and reaches synchronous with host node.This synchronizing process is divided into drift measuring phases and offset measurement and delay
Measuring phases.
First stage corrects host node and from the time deviation between node, and referred to as drift measures.In amendment drift value
In the process, host node is according to the fixed interval of definition periodically to issuing only synchrodata from node accordingly
Packet.This synchronization packets includes the time Estimate value that the data packet leaves host node.The correct time of host node measurement transmitting,
Received correct time is measured from node.Host node issues Article 2 synchronization packets later, this data packet is synchronous with upper one
Data packet is associated, and includes the more accurate estimated value that synchronization packets are put on communication path.In this way, to transmitting and connecing
The propagation that the measurement of receipts is stabbed with the standard time can separate.According to synchronization packets and the letter in data packet is followed from node
Then breath corrects the time from node to calculate offset according to this offset, if do not postponed in a transmission path,
So two clocks will synchronize.
In order to improve amendment precision, host node can be taken into account to from the data packet transmission delay waiting time of node
Come, i.e. delay measurements, this is the second stage of synchronizing process.
" delay request " data packet is issued from node to host node, determines that the data packet passes in this process
Pass correct time.Host node stamps a timestamp to received data packet, when then in " delay response " data packet receiving
Between stab and send back to from node.According to passing time stamp and host node provide receiving time stamp, from node calculate with host node it
Between delay time.Different from offset measurement, delay measurements irregularly carry out, and interval time of measurement is measured than deviant
Interval time is big.Make the load of communication channel especially device end not too large in this way.It, can using this synchronizing process
To cut down the waiting time between main and subordinate node.
Compared with the existing technology, the present invention passes common-view mode using number and high-performance tames clock technology, changes original
Time-frequency equipment is only focused on providing timing signal, can not provide the mode of high-precision homophase frequency reference signal in real time；Using
Wireless two-way compares the accuracy correction realized between two units, and tames the time service that clock realizes each isolated node using high-performance
Ability and the output of high-precision frequency marking, to transform original pyramid structure as distributed video structure.Any one node
Failure can obtain high-precision markers and frequency marking from another node by distributed time-frequency network.It can effectively solve and do not defending
Split-second precision reunification in the case of star time signal between different motion platform, military significance, economic benefit are obvious.
Detailed description of the invention
Fig. 1 is the cross-platform time synchronism apparatus composition block diagram of the present invention.
Fig. 2 is the data combination unit hardware platform framework figure in the present invention.
Fig. 3 is the general time difference comparing unit hardware platform frame in the present invention.
Fig. 4 is the time frequency signal expanding element hardware platform frame in the present invention.
The cross-platform time synchronism apparatus application example of Fig. 5 present invention.
Fig. 6 is the cross-platform method for synchronizing time flow chart of the present invention.
Specific embodiment
The cross-platform time synchronism apparatus implemented according to the present invention is as shown in Figure 1, by point-to-point radio station or IP network etc.
Communication link, split-second precision one between combining each platform itself time-frequency equipment to realize different platform cross-platform time synchronism apparatus
It causes；It specifically includes that
Time difference signal is fed to the general time difference by agreement and signal conversion, conditioning by general time difference comparing unit, outside
Comparing unit carries out real-time resolving；
Data combination unit carries out comprehensive solution to the basic measurement data of the general each comparing unit of time difference comparing unit
It calculates, built-in master clock algorithm, efficient time difference processing, update information output may be implemented；Other multiple units are carried out simultaneously
Comprehensive coordinated management；
Clock unit is tamed, after the high-precision timing signal for receiving external time source, starting internal accuracy monitoring is isolated outer
The jitter error of portion's time source, while the timing signal after preferably is sent into high precision time interval counter, with taming clock sheet
Ground divides second progress time difference comparison, and comparison result and accuracy monitoring value are sent into error handling units together, are filtered by high-performance
Algorithm realizes the separation to drift, jitter error, output error correction amount；The amendment of the Realtime Prediction of the correction amount and Allan variance
Amount is used to control together accurate difference correction and high-precision sequential machine, realizes to local frequency dividing second and local rate-adaptive pacemaker
Real-time compensation amendment, to export accurately time and frequency standards signal；
Digital frequency division clock generates and each when frequency standard signal is walked when steady using the height of taming clock unit output for time-code
Kind frequency standard signal, which generates, provides various reference signals；
Phase microstepper realizes accurate difference/TEC time error correction；
Time frequency signal expanding element, for meeting various types of signaling interface requirements, realizing signal condition and numbering defeated
Signal format out；
Network monitor interface, for remotely carrying out online management to cross-platform time synchronism apparatus.
Further, above-mentioned general time difference comparing unit includes:
IP network comparing unit turns IP mode by time-code, using customized synchronization packets (for details, see the appendix), realizes
Principal and subordinate's time difference in net transmits, to realize two-way time synchronization, by the data combination of multiple nodes, realizes the networking time
High-precise synchronization；Hardware capability uses Ti high performance float-point calculation process platform.Hardware platform frame is shown in Fig. 3.
Wireless channel comparing unit transmits simple time-code using FM, AM mode, realizes point-to-point or point to multi--point
The two-way mutual biography of time-code, to realize precise synchronization；
Satellite common vision comparing unit compares receiver unit by satellite common vision, when realizing the precision for being directed to GNSS satellite
Between compare.
Further, general time difference comparing unit is all made of FPGA+DSP frame.
Further, data combination unit is the core of cross-platform time synchronism apparatus.Data combination unit includes signal
And message processing module, data combination module and interface realize three parts；Mainly use DSP, floating-point signal processor
It is constituted with FPGA frame；Floating-point signal processor include 2 fixed point arithmetic logic units, 4 floating-point arithmetic logic units,
2 multipliers, 300MHz clock rate, 2400MIPS amount to 8 independent functional units.Hardware platform frame is shown in Fig. 2.
Time frequency signal expanding element hardware platform frame is detailed in Fig. 4.Time frequency signal expanding element uses universal design, can be real
Now receive the laggard line level conversion of multichannel external input sources integrated treatment, branch amplification output.It will mainly be come from the present invention
The NPPS signal of the Transistor-Transistor Logic level of digital frequency division clock through multichannel driving and level conversion after, output multi-channel road RS-422A interface
NPPS signal, output is for users to use.
Actual application environment of the present invention is as shown in Figure 5.Cross-platform time synchronism apparatus is respectively configured in different platform, makees
For the input source of time-frequency equipment in platform；Pass through data transmission equipment (such as satellite communication equipment, ultrashort between cross-platform time synchronism equipment
Communications apparatus etc.) the link transmission self-defining data packet built, time difference measurements, clock status monitoring are realized, when realizing school
With it is synchronous.It is consistent to aim at time accuracy between different platform.
A kind of cross-platform method for synchronizing time based on above-mentioned cross-platform time synchronism apparatus, be detailed in Fig. 6 it is cross-platform when
Between synchronous method flow chart；It is characterized in that by the communication links such as point-to-point radio station or IP network, will at least two it is cross-platform
Time synchronism apparatus combines each platform itself time-frequency equipment, and forms a synchronization system with respective data transmission equipment, realizes different
Split-second precision is consistent between platform；Specifically comprise the following steps
(1) after system electrification, each data set of clock port (taming clock unit) is initialized first, local clock is carried out
Sampling, the calculation formula of applied clock variance calculate the clock variance evaluation of local clock；
(2) after the completion of initializing, local clock state is set as host node, synchrodata is constructed according to the data set of clock
Packet is sent into after formatting synchronization packets and sends buffer area and send to communication channel, meanwhile, system is by same step number
It is recorded according to the sending time of packet；Subsequent data packet is constructed, the sending time of synchronization packets is put into data packet, it will be with
It formats and is sent into data packet and send buffer area, issued after synchronization packets issue fixed intervals；
(3) to synchronization packets and subsequent synchronisation data packet transmission while, clock port to the message on network into
Row is monitored, and is received, and write down receiving time if having message arrival, is judged according to the identifier of data packet, seen
The data packet received is which kind of data packet solves data packet if the data packet received is synchronization packets
It wraps and reception processing is carried out to the data packet received, if the synchronization packets received are effective data packets, call best
Host node modular algorithm judges the state of local clock.
(4) if the state of local clock is still host node after running best master node algorithm, according to set
Time interval continues periodically to send synchronization packets and subsequent data packet into network；It is sent if host node is received from node
Delay request data package, then will postpone request data package reach time record, building delay request-reply data packet
And the time for postponing request data package arrival host node is put into data packet；After building delay request-reply data packet,
Host node is sent into transmission buffer area and is sent to from node after formatting data packet；
(5) if the state of local clock becomes after having run best master node algorithm from node, system is by basis
Delay request data package is formatted and is sent into transmission buffer area and sent out to host node by setting building delay request data package
It send；System records the sending time for postponing request data package, continues waiting for received data packet；When local clock receive with
When with data packet, local clock will unpack to data packet and extract from data packet the time of synchronization packets transmission；When from
When node receives delay request-reply data packet, data packet is unpacked and extracts host node from delay request-reply data packet
Receive the time of delay request data package；Calculate the reporting from node and host node, to time of local clock into
Row adjustment；
(6) when local clock is in from node, starting is received overtime timer (data combination unit in Fig. 1 by system
Soft timer interior, that FPGA is generated), if local clock port does not receive the data that other clocks are sent within the set time
Packet, then the pressure of the state of local clock will be set as primary node status by system, send data packet to network.
Annex: self-defining communication protocol
Format is recommended using CCITT, it is contemplated that amount of compressed data, because needing to transmit time difference update information, so to standard
Format is improved.
Format description:
Each information is packaged by the frame of 6 bytes, and each information frame is that frame head and data segment are constituted.RTK and time difference
Divide and define three kinds of information types:
2. observing data information-carrier phase and random measurement data
2. nodal information
3. the ASCII information of host node description information-name and description
4. the time difference transmits information: comparing time scale information and local deflection forecast amount
The compression measurement interrecord structure of subordinate list 1
| Transmission structure | Transmit byte number |
| Packet header | 4 bytes |
| Observation data information starts section (type 0) | 6 bytes |
| Node 1 observes data information | 8 bytes |
| Node 2 observes data information | 8 bytes |
| …………… | ……… |
| Node n | 8 bytes |
| Packet tail | 2 bytes |
| ……………………….. | …………… |
| Time difference data packet | |
| ………………………….. | |
| …………………………….. | |
| Time difference data packet |
(2) package definition
Each information is sent with the frame of 6 bytes, detailed pack arrangement such as table 2.
Packet identification field, Info Type field, message length field, information data field, check code word by transmission
Section, end of transmission identification field are constituted.
2 package definition of subordinate list
Although the offer of data check field prevents packet error ability, data link will also provide additional and sufficient mistake inspection
System is surveyed to ensure that the information content that rover station receives is effective.
(3) time difference information sub-block:
| Parameter | Bit number | Range | Unit | Description |
| PRN | 4 | 1-50 | Node serial number | |
| STTIME | 6 | Compare the moment | ||
| TRKL | 5 | Compare tracking length | ||
| REFSV | 4 | Unit 0.1ns | It is local to refer to the time difference | |
| TIC | 5 | The time difference is not corrected | ||
| MDTR | 4 | Unit 0.1ns | Broadcast delay | |
| It is reserved | 5 |
Claims (5)
1. a kind of cross-platform time synchronism apparatus, it is characterised in that specifically include that
General time difference comparing unit, outside are fed to general time difference comparison by agreement and signal conversion, conditioning, by time difference signal
Unit carries out real-time resolving；
Data combination unit carries out data combination to the basic measurement data of the general each comparing unit of time difference comparing unit, interior
Master clock algorithm is set, efficient time difference processing, update information output may be implemented；Comprehensive association is carried out to other multiple units simultaneously
With management；
Clock unit is tamed, after the high-precision timing signal for receiving external time source, starting internal accuracy monitoring, when isolating outside
Between source jitter error, while will preferably after timing signal be sent into high precision time interval counter, locally point with taming clock
The frequency second carries out time difference comparison, and comparison result and accuracy monitoring value are sent into error handling units together, pass through high-performance filtering algorithm
Realize the separation to drift, jitter error, output error correction amount；The Realtime Prediction correction amount one of the correction amount and Allan variance
It rises and is used to control accurate difference correction and high-precision sequential machine, realize to the real-time of local frequency dividing second and local rate-adaptive pacemaker
Compensating approach, to export accurately time and frequency standards signal；
Digital frequency division clock, when frequency standard signal is walked when steady using the height of taming clock unit output, for time-code generation and various frequencies
It marks signal and the various reference signals of offer is provided；
Phase microstepper realizes accurate difference/TEC time error correction；
Time frequency signal expanding element realizes signal condition and number output letter for meeting various types of signaling interface requirements
Number format；
Network monitor interface, for remotely carrying out online management to cross-platform time synchronism apparatus.
2. cross-platform time synchronism apparatus according to claim 1, it is characterised in that above-mentioned general time difference comparing unit packet
It includes:
IP network comparing unit turns IP mode by time-code, using customized synchronization packets, realizes principal and subordinate's time difference in net
Transmitting, by the data combination of multiple nodes, realizes that networking time accuracy is synchronous to realize two-way time synchronization；
Wireless channel comparing unit transmits simple time-code using FM, AM mode, when realizing point-to-point or point to multi--point
The two-way mutual biography of code, to realize precise synchronization；
Satellite common vision comparing unit compares receiver unit by satellite common vision, realizes the chronometer time ratio for being directed to GNSS satellite
It is right.
3. cross-platform time synchronism apparatus according to claim 1, it is characterised in that general time difference comparing unit is all made of
FPGA+DSP frame.
4. cross-platform time synchronism apparatus according to claim 1, it is characterised in that data combination unit include signal and
Message processing module, data combination module and interface realize three parts；Mainly using DSP, floating-point signal processor and
FPGA frame is constituted；Floating-point signal processor includes 2 fixed point arithmetic logic units, 4 floating-point arithmetic logic units, 2
A multiplier amounts to 8 independent functional units, wherein floating-point signal processor clock rate 300MHz, per second 2400
Ten thousand command M IPS.
5. a kind of cross-platform method for synchronizing time based on cross-platform time synchronism apparatus described in one of the claims, special
Sign is through communication links such as point-to-point radio station or IP networks, at least will combine each platform by two cross-platform time synchronism apparatus
Itself time-frequency equipment, and a synchronization system is formed with respective data transmission equipment, split-second precision is consistent between realizing different platform；Tool
Body includes the following steps:
(1) it initializes；
(2) local clock state is set as host node, constructs synchronization packets, subsequent data packet, and fixed intervals issue；
(3) data packet on network is monitored, calls best master node modular algorithm to judge the state of local clock；
(4) it is judged as host node, then continues periodically to send synchronization packets into network according to set time interval
With subsequent data packet；The delay request data package sent from node is received, then replys delay request-reply data packet；
(5) it is judged as from node, then sends delay request data package, receive delay request-reply data packet and calculates from node
With the reporting of host node, the time of local clock is adjusted；
(6) from node starting receives overtime timer when, if local clock port does not receive other within the set time
The data packet that clock is sent, then the pressure of the state of local clock will be set as primary node status by system, send data packet to network.
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| CN110392290A (en) * | 2018-04-17 | 2019-10-29 | 晨星半导体股份有限公司 | Weakened phase restoring device and weakened phase restoring method applied to DTV broadcasting-satellite system receiving end |
| US10812251B2 (en) * | 2018-12-18 | 2020-10-20 | Simmonds Precision Products, Inc. | Distributed time synchronization protocol for an asynchronous communication system |
| CN113810248B (en) * | 2021-09-16 | 2023-12-29 | 中国电子科技集团公司第五十四研究所 | Test and evaluation method for signal synchronization performance of distributed time-frequency link |
| CN115242345B (en) * | 2022-07-28 | 2023-07-28 | 广西自贸区见炬科技有限公司 | Thermoelectric device system time synchronization and real-time resolving processing system |
| CN117112072B (en) * | 2023-10-25 | 2023-12-22 | 成都云祺科技有限公司 | Cross-platform virtual machine drive replacement method, system and storage medium |
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| US20020181831A1 (en) * | 2001-06-01 | 2002-12-05 | Myers Michael H. | Tamed spectrum multiplexing |
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| CN101383653A (en) * | 2008-10-30 | 2009-03-11 | 航天东方红卫星有限公司 | Automatic time synchronizing method on satellite |
| CN202940822U (en) * | 2012-11-28 | 2013-05-15 | 中国舰船研究设计中心 | Marine local area network time unification system |
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