CN107809295A - 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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- CN107809295A CN107809295A CN201711078787.3A CN201711078787A CN107809295A CN 107809295 A CN107809295 A CN 107809295A CN 201711078787 A CN201711078787 A CN 201711078787A CN 107809295 A CN107809295 A CN 107809295A
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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 method, it is characterized in that pass through the communication links such as point-to-point radio station or IP network, at least two cross-platform time synchronism apparatus are combined into each platform itself time-frequency equipment, 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 pattern 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, so as to transform original pyramid structure as distributed video structure.Any one node failure can obtain high-precision markers and frequency marking by distributed time-frequency network from another node.It is obvious effectively to solve the split-second precision reunification between different motion platform, military significance, economic benefit under no satellite time transfer signal condition.
Description
Technical field
The invention belongs to naval vessel information systems technology field, and in particular to a kind of method for synchronizing time and device.
Background technology
Time synchronized is one of primary demand of electronic information, is particularly led in high-performance calculation, military project, telecommunications etc.
Domain.With the development of information technology, Long baselines include cross-platform information sharing, cooperated to different platform different geographical
The precise synchronization of electronic information proposes higher requirement.Precision ranging and other professional high precision measuring systems
Time synchronized requires musec order, and cooperative air-defense precision strike system requirements synchronization accuracy is in 100ns magnitudes.
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 typically 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 ensure between different zones, different platform
The precise synchronization of electronic information, realize and cooperate.
The content of the invention
The technical problem to be solved in the present invention is：Solution is in the outside time service source such as satellite when receiving interference, can not monitor and
Calibrate the time consistency problem between different platform.There is provided a kind of when being applied to cross-platform between different platform (ship, bank, machine etc.)
Between synchronous method and a kind of cross-platform time synchronism apparatus, realize the height independent of outside 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 mainly include：
General time difference comparing unit, it is outside to be changed, nursed one's health by agreement and signal, time difference signal is fed to the general time difference
Comparing unit, carry out real-time resolving；
Data combination unit, to the basic measurement data of the general each comparing unit of time difference comparing unit, carry out integrating solution
Calculate, built-in master clock algorithm, it is possible to achieve efficient time difference processing, update information output；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, starts internal accuracy monitoring, isolates 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
The ground frequency dividing second carries out time difference comparison, and comparison result is sent into error handling units with accuracy monitoring value, filtered by high-performance in the lump
Algorithm is realized to drift, the separation of jitter error, output error correction；The Realtime Prediction amendment of the correction and Allan variance
Amount is used to control accurate difference correction and high-precision sequential machine together, realizes to local frequency dividing second and local rate-adaptive pacemaker
Real-Time Compensation amendment, so as to export accurately time and frequency standards signal；
Digital frequency division clock, using the height of taming clock unit output it is steady when frequency standard signal enter to walk when, produced for time-code and each
Kind frequency standard signal, which produces, provides various reference signals；
Phase microstepper, realize accurate difference/TEC time error correction；
Time frequency signal expanding element, for meeting various types of signaling interface requirements, realize signal condition and number defeated
Go out signal format；
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, IP modes are turned by time-code, using customized synchronization packets, realize the principal and subordinate in net
The time difference transmits, and so as to realize two-way time synchronized, by the data combination of multiple nodes, realizes that networking time accuracy is same
Step；
Wireless channel comparing unit, using FM, AM pattern, simple time-code is transmitted, realizes point-to-point or point to multi--point
Time-code it is two-way mutually pass, so as to realize precise synchronization；
Satellite common vision comparing unit, receiver unit is compared by satellite common vision, when realizing the precision for GNSS satellite
Between compare.
Further, general time difference comparing unit uses FPGA+DSP frameworks.
Further, data combination unit includes signal and message processing module, data combination module and interface realizes three
Individual part；Mainly formed using DSP, floating-point signal processor and FPGA frameworks；Floating-point signal processor includes 2
Fixed point arithmetic logic unit, 4 floating-point arithmetic logic units, 2 multipliers, 300MHz clock rates, 2400MIPS amount to 8
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
The communication link such as platform or IP network, at least two cross-platform time synchronism apparatus are combined into each platform itself time-frequency equipment, 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) initialize；
(2) local clock state is set to host node, structure synchronization packets, subsequent data bag, and fixed intervals are sent；
(3) 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 bag and subsequent data bag；The delay request data package sent from node is received, then replys delay request-reply packet；
(5) be judged as from node, then send delay request data package, receive delay request-reply packet and calculate from
The reporting of node and host node, the time of local clock is adjusted；
(6) from node when start receive overtime timer, if local clock port does not receive it within the time of setting
The packet that his clock is sent, then system the state of local clock will be forced be set as primary node status, send number to network
According to bag.
The principle of the present invention is as follows：
(1) digitlization of time scale information, its 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 terminal can calculates 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., be spaced stringent synchronization.It is (same to send information
Step data bag) timestamp is contained, it describe accurately the scheduled time that packet is sent.And the actual transmission time is entered
Row measurement, is marked in next synchronization packets；Receiving terminal obtains the true of synchronization packets using physical measurement mode and connect
Between time receiving, receiving terminal can utilize the true of the acquisition in the next synchronization packets received to send the time, after carrying out computing,
The time difference between slave clock and host node can be calculated, and corrects the time of slave node accordingly.But now calculate
The time difference contain delay caused by network transmission.By repeatedly receiving, using maximum Likelihood, passed so as to calculate
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
Exchange synchronization packets and reach 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 measured from the time deviation between node, referred to as drift.Repairing positive drift amount
During, host node is according to the fixed interval of definition periodically to sending only synchrodata from node accordingly
Bag.This synchronization packets includes the time Estimate value that the packet leaves host node.The correct time that host node measurement is transmitted,
The correct time received from node measurement.Host node sends Article 2 synchronization packets afterwards, and this packet is synchronous with upper one
Packet is associated, and the more accurate estimate on communication path is put into comprising synchronization packets.So, to transmitting and connecing
The measurement of receipts and the propagation of standard time stamp can separate.According to synchronization packets and the letter in packet is followed from node
Cease to calculate offset, then correct the time from node according to this offset, if do not postponed in a transmission path,
So two clocks will be synchronous.
In order to improve amendment precision, host node can be taken into account to from the packet transmission delay stand-by period of node
Come, i.e. delay measurements, this is the second stage of synchronizing process.
" delay request " data packet is sent from node to host node, determines that the packet passes in this process
Pass correct time.Host node stamps a timestamp to received data packet, when then handle receives in " delay response " packet
Between stab and send back to from node.According to passing time stamp and host node provide reception timestamp, from node calculate with host node it
Between time delay.Different from offset measurement, delay measurements are irregularly carried out, the measurement of its interval time of measurement ratio deviation value
Interval time is big.So make it that the load of communication channel especially device end is not too large., can using this synchronizing process
To cut down the stand-by period between main and subordinate node.
Relative to prior art, 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 pattern of high-precision homophase frequency reference signal in real time；Using
Wireless two-way, which compares, realizes accuracy correction 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, so as to transform original pyramid structure as distributed video structure.Any one node
Failure can obtain high-precision markers and frequency marking by distributed time-frequency network from another node.Can effectively solve do not defending
Split-second precision reunification in the case of star time signal between different motion platform, military significance, economic benefit are obvious.
Brief description of the drawings
Fig. 1 is the cross-platform time synchronism apparatus composition frame chart 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 framework in the present invention.
Fig. 4 is the time frequency signal expanding element hardware platform framework 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.
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, cross-platform time synchronism apparatus is realized into split-second precision one between different platform with reference to each platform itself time-frequency equipment
Cause；Mainly include：
General time difference comparing unit, it is outside to be changed, nursed one's health by agreement and signal, time difference signal is fed to the general time difference
Comparing unit, carry out real-time resolving；
Data combination unit, to the basic measurement data of the general each comparing unit of time difference comparing unit, carry out integrating solution
Calculate, built-in master clock algorithm, it is possible to achieve efficient time difference processing, update information output；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, starts internal accuracy monitoring, isolates 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
The ground frequency dividing second carries out time difference comparison, and comparison result is sent into error handling units with accuracy monitoring value, filtered by high-performance in the lump
Algorithm is realized to drift, the separation of jitter error, output error correction；The Realtime Prediction amendment of the correction and Allan variance
Amount is used to control accurate difference correction and high-precision sequential machine together, realizes to local frequency dividing second and local rate-adaptive pacemaker
Real-Time Compensation amendment, so as to export accurately time and frequency standards signal；
Digital frequency division clock, using the height of taming clock unit output it is steady when frequency standard signal enter to walk when, produced for time-code and each
Kind frequency standard signal, which produces, provides various reference signals；
Phase microstepper, realize accurate difference/TEC time error correction；
Time frequency signal expanding element, for meeting various types of signaling interface requirements, realize signal condition and number defeated
Go out signal format；
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, IP modes are turned by time-code, using customized synchronization packets (for details, see the appendix), realized
Principal and subordinate's time difference in net transmits, and so as to realize two-way time synchronized, by the data combination of multiple nodes, realizes the networking time
High-precise synchronization；Hardware capability uses Ti high performance float-point calculation process platforms.Hardware platform framework is shown in Fig. 3.
Wireless channel comparing unit, using FM, AM pattern, simple time-code is transmitted, realizes point-to-point or point to multi--point
Time-code it is two-way mutually pass, so as to realize precise synchronization；
Satellite common vision comparing unit, receiver unit is compared by satellite common vision, when realizing the precision for GNSS satellite
Between compare.
Further, general time difference comparing unit uses FPGA+DSP frameworks.
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 using DSP, floating-point signal processor
Formed with FPGA frameworks；Floating-point signal processor include 2 fixed point arithmetic logic units, 4 floating-point arithmetic logic units,
2 multipliers, 300MHz clock rates, 2400MIPS amount to 8 independent functional units.Hardware platform framework is shown in Fig. 2.
Time frequency signal expanding element hardware platform framework refers to 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 signals of the Transistor-Transistor Logic level of digital frequency division clock through multichannel driving and level conversion after, output multi-channel road RS-422A interfaces
NPPS signals, 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 bag built, time difference measurements, clock status monitoring are realized, when realizing school
With it is synchronous.Time accuracy is consistent between aiming at different platform.
A kind of cross-platform method for synchronizing time based on above-mentioned cross-platform time synchronism apparatus, refer to Fig. 6 it is cross-platform when
Between synchronous method flow chart；It is characterized in that by communication links such as point-to-point radio station or IP networks, 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 to host node, synchrodata is built according to the data set of clock
Bag, synchronization packets are entered after row format conversion to be sent into sends buffering area and is sent to communication channel, meanwhile, system is by same step number
Recorded according to the transmission time of bag；Subsequent data bag is built, the transmission time of synchronization packets is put into packet, will be with
Enter row format with packet to change and be sent into transmission buffering area, sent after synchronization packets send fixed intervals；
(3) while to synchronization packets and the transmission of subsequent synchronisation packet, clock port enters to the message on network
Row is monitored, and is received if having message arrival, and is write down and received the time, is judged according to the identifier of packet, seen
Which kind of packet the packet received is, if the packet received is synchronization packets, packet is solved
Wrap and the packet to receiving carries out reception processing, if the synchronization packets received are effective data packets, call optimal
Host node modular algorithm judges the state of local clock.
(4) if the state of local clock is still host node after best master node algorithm is run, according to set
Time interval continues periodically to send synchronization packets and subsequent data bag into network；Sent if host node receives from node
Delay request data package, then by postpone request data package reach time record, structure delay request-reply packet
And the time for postponing request data package arrival host node is put into packet；After delay request-reply packet is built,
Packet is entered after row format conversion to be sent into transmission buffering area and is sent to from node by host node；
(5) if the state of local clock is changed into after best master node algorithm has been run from node, system is by basis
Set structure delay request data package, will delay request data package enter row format change and be sent into send buffering area to host node hair
Send；System records the time that sends for postponing request data package, continues waiting for received data packet；When local clock receive with
During with packet, local clock will unpack to packet and the time of synchronization packets transmission extracted from packet；When from
When node receives delay request-reply packet, packet is unpacked and extracts host node from delay request-reply packet
Receive the time of delay request data package；The reporting from node and host node is calculated, the time of local clock is entered
Row adjustment；
(6) when local clock is in from node, system, which will start, receives overtime timer (data combination unit in Fig. 1
It is interior, soft timer caused by FPGA), if local clock port does not receive the data that other clocks are sent within the time of setting
Wrap, then system will force the state of local clock to be set as primary node status, and packet is sent to network.
Annex：Self-defining communication protocol
Form is recommended using CCITT, it is contemplated that amount of compressed data, because needing to transmit time difference update information, so to standard
Form is improved.
Format description：
Each information is formed by the frame packing of 6 bytes, and each information frame is that frame head and data segment are formed.RTK and time difference
Divide and define three kinds of information types：
2. observe data message-carrier phase and random measurement data
2. nodal information
3. host node description information-name and the ASCII information of description
4. time difference transmission information：Compare 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 message starts section (type 0) | 6 bytes |
| Node 1 observes data message | 8 bytes |
| Node 2 observes data message | 8 bytes |
| …………… | ……… |
| Node n | 8 bytes |
| Bag 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.
Bag identification field, Info Type field, message length field, information data field, check code word by transmission
Section, end of transmission identification field are formed.
The package definition of subordinate list 2
Although data check field provides the bag error ability that prevents, data link will also provide extra 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 | Scope | 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 mainly include：
General time difference comparing unit, it is outside to be changed, nursed one's health by agreement and signal, time difference signal is fed to general time difference comparison
Unit, carry out real-time resolving；
Data combination unit, to the basic measurement data of the general each comparing unit of time difference comparing unit, data combination is carried out, it is interior
Put master clock algorithm, it is possible to achieve efficient time difference processing, update information output；Simultaneously other multiple units are carried out integrating association
With management；
Clock unit is tamed, after the high-precision timing signal for receiving external time source, starts internal accuracy monitoring, when isolating outside
Between source jitter error, while will preferably after timing signal be sent into high precision time interval counter, with taming clock locally point
The frequency second carries out time difference comparison, and comparison result is sent into error handling units with accuracy monitoring value, passes through high-performance filtering algorithm in the lump
Realize to drift, the separation of jitter error, output error correction；The Realtime Prediction correction one of the correction and Allan variance
Rise and be 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, so as to export accurately time and frequency standards signal；
Digital frequency division clock, when frequency standard signal enters to walk when the height exported using taming clock unit is steady, produced and various frequencies for time-code
Mark signal and the various reference signals of offer are provided；
Phase microstepper, realize accurate difference/TEC time error correction；
Time frequency signal expanding element, for meeting various types of signaling interface requirements, realize signal condition and numbering output letter
Number form；
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 bag
Include：
IP network comparing unit, IP modes are turned by time-code, using customized synchronization packets, realize principal and subordinate's time difference in net
Transmit, so as to realize two-way time synchronized, by the data combination of multiple nodes, realize the synchronization of networking time accuracy；
Wireless channel comparing unit, using FM, AM pattern, simple time-code is transmitted, when realizing point-to-point or point to multi--point
Code is two-way mutually to be passed, so as to realize precise synchronization；
Satellite common vision comparing unit, receiver unit is compared by satellite common vision, realizes the chronometer time ratio for 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 uses
FPGA+DSP frameworks.
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 frameworks are formed；Floating-point signal processor includes 2 fixed point arithmetic logic units, 4 floating-point arithmetic logic units, 2
Individual multiplier, 300MHz clock rates, 2400MIPS amount to 8 independent functional units.
5. a kind of cross-platform method for synchronizing time based on one of the claims cross-platform time synchronism apparatus, it is special
Sign is by 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 comprises the following steps：
(1) initialize；
(2) local clock state is set to host node, structure synchronization packets, subsequent data bag, and fixed intervals are sent；
(3) 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 bag；The delay request data package sent from node is received, then replys delay request-reply packet；
(5) it is judged as from node, then sending delay request data package, receiving delay request-reply packet and calculate from node
With the reporting of host node, the time of local clock is adjusted；
(6) from node when start receive overtime timer, if local clock port does not receive other within the time of setting
The packet that clock is sent, then system the state of local clock will be forced be set as primary node status, send 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 |
| CN111343228A (en) * | 2018-12-18 | 2020-06-26 | 西蒙兹精密产品公司 | Distributed time synchronization protocol for asynchronous communication systems |
| CN111343228B (en) * | 2018-12-18 | 2024-04-09 | 西蒙兹精密产品公司 | Distributed time synchronization protocol for asynchronous communication system |
| CN113810248A (en) * | 2021-09-16 | 2021-12-17 | 中国电子科技集团公司第五十四研究所 | Distributed time-frequency link signal synchronization performance oriented test and evaluation method |
| 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 |
| CN115242345A (en) * | 2022-07-28 | 2022-10-25 | 广西自贸区见炬科技有限公司 | Thermoelectric equipment system time synchronization and real-time calculation processing system |
| 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 |
| CN117112072A (en) * | 2023-10-25 | 2023-11-24 | 成都云祺科技有限公司 | Cross-platform virtual machine drive replacement method, system and storage medium |
| 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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