CN108322281A - Time calibration in network service based on NTP and assessment system and method - Google Patents
Time calibration in network service based on NTP and assessment system and method Download PDFInfo
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- CN108322281A CN108322281A CN201810455478.1A CN201810455478A CN108322281A CN 108322281 A CN108322281 A CN 108322281A CN 201810455478 A CN201810455478 A CN 201810455478A CN 108322281 A CN108322281 A CN 108322281A
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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
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
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Abstract
The time calibration in network service that the invention discloses a kind of based on NTP and assessment system and method, system includes client and server；Client for generating the NTP Query Information packets for meeting consensus standard, and is sent to server；The server, the NTP Query Informations packet for receiving client transmission are generated NTP information packets from local zone time and are sent back to the client by Network Time Protocol specification；Client is additionally operable to check the temporal information packet that server returns, analyze, and generates the difference of NTP times and local zone time, and then is adjusted realization to local zone time and synchronizes.Data processing algorithm in the present invention can reduce influence of the network delay to synchronization accuracy by collecting effective measurement data by certain processing.NTP message interactions through excessive bout, can obtain one group of network delay and reporting, and data processing algorithm obtains most effective deviation by the processing to these values.
Description
Technical field
The present invention relates to network technique fields, specifically, more particularly to a kind of time calibration in network service based on NTP with comment
Estimate system and method.
Background technology
The temporal frequency fundamental physical quantity important as one rises in national economy, national defense construction and basic scientific research
Important role.It is current most accurate fundamental physical quantity, has a good transitivity, and with it is public daily
It lives closely related.With the fast development of electronic information technology and Internet, when the high-precisions such as e-commerce, E-Government
Between constraint business the time synchronization of entire society is required to be increasingly stringenter, financial industry, major telecommunications, mobile communication, power grid
Digital transformer substation, electronic-parking timing and charging system, communications and transportation control centre, oil and gas pipeline control centre, aviation
It is required for realizing safe and reliable and high accuracy time synchronization in the public service systems such as blank pipe, and in these activities, meter
Calculation machine plays a crucial role the processing and transmission of information.The clock accuracy of computer is very low, just has in one day several seconds
The clock even time drift of a few minutes can no longer meet the requirement of split-second precision constraint business, therefore, how in network system
Realize that precise synchronization is a considerable problem in system.
Invention content
In order to solve problems in the prior art, the time calibration in network service that an embodiment of the present invention provides a kind of based on NTP with
Assessment system.The technical solution is as follows：
On the one hand, a kind of time calibration in network service based on NTP and assessment system, including client and server are provided；
The client and the server pass through network connection；
The client for generating the NTP Query Information packets for meeting consensus standard, and is sent to the server；
The server, the NTP Query Informations packet sent for receiving the client, by Network Time Protocol specification, from
Local zone time generates NTP information packets and send back to the client；
The client is additionally operable to check the temporal information packet that the server returns, analyze, and generates NTP
The difference of time and local zone time, and then realization is adjusted to local zone time and is synchronized.
Further, the time calibration in network service based on NTP and assessment system include network time server clock source information
Management module, quantity, priority essential information for showing and managing network time server external control clock source；
The server includes server end time service precision monitoring modular, is taken for display server end main frame time, NTP
Business device source address, current ntp server grade, monitoring server end main frame clock jitter, clock jitter, communication delay, time
Wobble information, and by monitoring result with 1 day for periodic report, and form report and curve, if server end host is offline, provide
Warning function；
The client includes client time service precision monitoring modular, for showing client host time, ntp server
Source address, current ntp server grade, monitoring client host clock jitter, clock jitter, communication delay, time jitter, frequency
Rate deviation, frequency drift information, and by monitoring result with 1 day for periodic report, and report and curve are formed, if client host
Offline, warning function is provided.
On the other hand, a kind of time calibration in network service based on NTP and appraisal procedure are provided, is included the following steps：
The client generates the NTP Query Information packets for meeting consensus standard, and is sent to the server；
The server-side receives the NTP Query Informations packet that the client is sent, by Network Time Protocol specification, from this
The ground time generates NTP information packets and send back to the client；
The client checks the temporal information packet that the server returns, is analyzed, and generates NTP times and this
The difference of ground time, and then realization is adjusted to local zone time and is synchronized.
Further, the time calibration in network service based on NTP further includes with appraisal procedure：
The client carries out in analytic process the NTP information packets that the server returns, and also to carry out
The estimation of network delay.
Further, the client checks the temporal information packet that the server returns, is analyzed, and generates
The difference of NTP times and local zone time, and then local zone time is adjusted and realizes that synchronous step specifically includes offset measurement
Stage and delay measurements stage；
Network Time Protocol is based on UDP, defines four kinds of clock messages：Sync message Sync, delay request message Delay_Req,
Follow message Follow_Up and delay request response message Delay_Resp.
Further, the offset measurement stage is used for correcting the time difference of master and slave clock；The offset measurement stage,
Include the following steps：
1) master clock sends sync message Sync to from clock, includes a timestamp in message, indicates that message is issued
Scheduled time；
2) master clock follows message Follow_Up after sync message Sync is sent, then to sending one from clock,
Include a timestamp in message, indicates that the true of sync message sends out time T1；
3) after clock receives sync message Sync, receiving time T2 is recorded；
The offset measurement stage has detached message transmissions and the time measures, and does not influence between each other；
The network delay of master-salve clock is denoted as Delay1, the correct time offset of master-salve clock be denoted as Offset (from when
Clock subtracts master clock), then from clock according to the T1 and receiving time T2 followed in message Follow_Up, it can be deduced that：
T2-T1=Offset+Delay1.
Further, the delay measurements stage is for measuring time delay caused by network transmission；The delay measurements
Stage includes the following steps：
1) after clock receives sync message Sync, delay request message Delay_Req is sent to master clock at the T3 moment；
2) after master clock receives delay request message Delay_Req, delay request response message is sent to from clock
Delay_Resp, message accounting master clock accurate receiving time T4；
The network delay of master-salve clock is denoted as Delay2, the correct time offset of master-salve clock
It is denoted as Offset (subtracting master clock from clock), then from when transmission of the clock according to delay request message Delay_Req
Between the time T4 that records in T3 and delay request response message Delay_Resp, it can be deduced that：
T3-Offset+Delay2=T4, namely：
T4-T3=Delay2-Offset
Assuming that the Delay2 of the network delay Delay1 and delay measurements stage in offset measurement stage
It is equal, i.e. Delay1=Delay2=Delay, it can be deduced that：
Delay=[(T2-T1)+(T4-T3)]/2
Offset=[(T2-T1)-(T4-T3)]/2.
The advantageous effect that technical solution provided in an embodiment of the present invention is brought is：
A kind of time calibration in network service based on NTP provided by the invention and assessment system and method, data processing therein
Algorithm can reduce influence of the network delay to synchronization accuracy by collecting effective measurement data by certain processing.Through
The NTP message interactions of excessive bout, can obtain one group of network delay and reporting, data processing algorithm pass through to these
The processing of value obtains most effective deviation.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the module diagram of a kind of the time calibration in network service and assessment system based on NTP of the embodiment of the present invention；
Fig. 2 is the flow chart of a kind of the time calibration in network service and appraisal procedure based on NTP of the embodiment of the present invention.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
The time calibration in network service and assessment system that the present invention provides a kind of based on NTP, referring to Fig. 1, including client 100
With server 200；The client 100 and the server 200 pass through network connection；
The client 100 for generating the NTP Query Information packets for meeting consensus standard, and is sent to the server；
The server 200, the NTP Query Informations packet sent for receiving the client, is advised by Network Time Protocol
Model generates NTP information packets from local zone time and send back to the client；
The client 100 is additionally operable to check the temporal information packet that the server returns, analyze, and generates
The difference of NTP times and local zone time, and then realization is adjusted to local zone time and is synchronized.
Specifically, in the present embodiment, the software of time calibration in network service and assessment system based on NTP includes mainly customer
Software and server software.This two parts is independent process, is independent of each other, respectively realize local computer as customer with
The function of server side.First, when local computer is as customer, it is desirable that the NTP that can be generated in accordance with consensus standard inquires letter
Breath packet is sent to server, and the temporal information packet that can be returned to server is checked, analyzed, and generates NTP times and this
The difference of ground time, and then realization is adjusted to local zone time and is synchronized；Secondly, it when local computer is as server side,
NTP inquiry data packets can be received by asking, and by Network Time Protocol specification, generated NTP information packets from local zone time and sent back to inquiry
Side.
Further, the time calibration in network service based on NTP and assessment system include network time server clock source information
Management module, quantity, priority essential information for showing and managing network time server external control clock source；
Specifically, the management of network time server clock source information is main realizes following functions：
(1) when clock source is satellite antenna, display satellite antenna receive satellite quantity and two
(2) priority that satellite antenna receives；
(3) when clock source is hydrogen clock, the priority of two hydrogen clocks is shown；
(4) displays temperature and frequency values.
The server 200 include server end time service precision monitoring modular, for the display server end main frame time,
Ntp server source address, current ntp server grade, monitoring server end main frame clock jitter, clock jitter, communication delay,
The information such as time jitter, and by monitoring result with 1 day for periodic report, and form report and curve, if server end host from
Line provides warning function；
Specifically, server end time service precision observation interface mainly realizes following functions：
(1) the display server end main frame time；
(2) ntp server source address is shown；
(3) current ntp server grade is shown；
(4) monitoring server end main frame clock jitter；
(5) monitoring server end main frame clock jitter；
(6) monitoring server end main frame communication delay；
(7) monitoring server end main frame time jitter；
(8) by monitoring result with 1 day for periodic report, and form report and curve, if server end host is offline, provide
Warning function.
The client 100 includes client time service precision monitoring modular, for showing client host time, NTP clothes
Business device source address, current ntp server grade, monitoring client host clock jitter, clock jitter, communication delay, time tremble
The information such as dynamic, frequency departure, frequency drift, and by monitoring result with 1 day for periodic report, and report and curve are formed, if objective
Family end main frame is offline, provides warning function.
Specifically, client's device end time service precision observation interface mainly realizes following functions：
(1) the client host time is shown；
(2) ntp server source address is shown；
(3) current ntp server grade is shown；
(4) client host clock jitter is monitored；
(5) client host clock jitter is monitored；
(6) client host communication delay is monitored；
(7) client host time jitter is monitored；
(8) client host frequency departure is monitored；
(9) client host frequency drift is monitored；
(10) by monitoring result with 1 day for periodic report, and form report and curve, if client host is offline, provide
Warning function.
In the present embodiment, this system is developed using B/S frameworks.The availability and maintainability of system are highlighted when exploitation,
The characteristics of we have carried out simplified processing to the deployment of system, the easy-to-use ease for maintenance that kept it more standby, has accomplished good use
It experiences at family.
On the other hand, a kind of time calibration in network service based on NTP and appraisal procedure are provided, referring to Fig. 2, including following step
Suddenly：
S100：The client generates the NTP Query Information packets for meeting consensus standard, and is sent to the server；
S200：The server-side receives the NTP Query Informations packet that the client is sent, by Network Time Protocol specification,
NTP information packets are generated from local zone time and send back to the client；
S300：The client checks the temporal information packet that the server returns, is analyzed, and when generating NTP
Between difference with local zone time, and then realization is adjusted to local zone time and is synchronized.
Further, the time calibration in network service based on NTP further includes with appraisal procedure：
The client carries out in analytic process the NTP information packets that the server returns, and also to carry out
The estimation of network delay.
Specifically, in the temporal information packet that customer's software returns to server carries out analytic process, net is also carried out
The estimation of network time delay.The design of this part is most important for the precision for improving time synchronization, therefore is needed before Software for Design
A large amount of statistical analysis is carried out to network state and delay data, to determine preferable delay compensation method.
Further, the device node in network by send and receive carry timestamp data packet, make oneself when
Clock is synchronous with standard time clock.The client checks the temporal information packet that the server returns, is analyzed, and generates
The difference of NTP times and local zone time, and then local zone time is adjusted and realizes that synchronous step specifically includes offset measurement
Stage and delay measurements stage；
Network Time Protocol is based on UDP, defines four kinds of clock messages：Sync message Sync, delay request message Delay_Req,
Follow message Follow_Up and delay request response message Delay_Resp.
Further, the offset measurement stage is used for correcting the time difference of master and slave clock；The offset measurement stage,
Include the following steps：
1) master clock sends sync message Sync to from clock, includes a timestamp in message, indicates that message is issued
Scheduled time；
2) master clock follows message Follow_Up after sync message Sync is sent, then to sending one from clock,
Include a timestamp in message, indicates that the true of sync message sends out time T1；
3) after clock receives sync message Sync, receiving time T2 is recorded；
The offset measurement stage has detached message transmissions and the time measures, and does not influence between each other；
The network delay of master-salve clock is denoted as Delay1, the correct time offset of master-salve clock be denoted as Offset (from when
Clock subtracts master clock), then from clock according to the T1 and receiving time T2 followed in message Follow_Up, it can be deduced that：
T2-T1=Offset+Delay1.
Further, the delay measurements stage is for measuring time delay caused by network transmission；The delay measurements
Stage includes the following steps：
1) after clock receives sync message Sync, delay request message Delay_Req is sent to master clock at the T3 moment；
2) after master clock receives delay request message Delay_Req, delay request response message is sent to from clock
Delay_Resp, message accounting master clock accurate receiving time T4；
The network delay of master-salve clock is denoted as Delay2, the correct time offset of master-salve clock
It is denoted as Offset (subtracting master clock from clock), then from when transmission of the clock according to delay request message Delay_Req
Between the time T4 that records in T3 and delay request response message Delay_Resp, it can be deduced that：
T3-Offset+Delay2=T4, namely：
T4-T3=Delay2-Offset
Assuming that the network delay Delay1 in offset measurement stage is equal with the Delay2 in delay measurements stage, i.e. Delay1=
Delay2=Delay, it can be deduced that：
Delay=[(T2-T1)+(T4-T3)]/2
Offset=[(T2-T1)-(T4-T3)]/2.
Specifically, a kind of time calibration in network service based on NTP in the present embodiment and assessment system and method, it is main to apply
In terms of time calibration in network service and assessment.Data processing algorithm can by certain processing by collecting effective measurement data
To reduce influence of the network delay to synchronization accuracy.NTP message interactions through excessive bout, can obtain one group of network delay with
Reporting, data processing algorithm obtain most effective deviation by the processing to these values.
Data processing algorithm includes two parts：Data filtering and data fitting.There may be networks to prolong in the data of collection
Value larger late, needs to eliminate its influence by certain filter algorithm；In order to efficiently use filtered data, need to carry out
Data are fitted, and most effective reporting is calculated.
The advantageous effect that technical solution provided in an embodiment of the present invention is brought is：
A kind of time calibration in network service based on NTP provided by the invention and assessment system and method, data processing therein
Algorithm can reduce influence of the network delay to synchronization accuracy by collecting effective measurement data by certain processing.Through
The NTP message interactions of excessive bout, can obtain one group of network delay and reporting, data processing algorithm pass through to these
The processing of value obtains most effective deviation.
The apparatus embodiments described above are merely exemplary, wherein can be as the unit that separating component illustrates
Or may not be and be physically separated, the component shown as unit may or may not be physical unit, i.e.,
A place can be located at, or may be distributed over multiple network units.It can select according to the actual needs therein
Some or all of module achieves the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creative labor
In the case of dynamic, you can to understand and implement.
The foregoing is merely a prefered embodiment of the invention, is not intended to limit the invention, all in the spirit and principles in the present invention
Within, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of time calibration in network service and assessment system based on NTP, which is characterized in that including client and server；It is described
Client and the server pass through network connection；
The client for generating the NTP Query Information packets for meeting consensus standard, and is sent to the server；
The server, the NTP Query Informations packet sent for receiving the client, by Network Time Protocol specification, from local
Time generates NTP information packets and send back to the client；
The client is additionally operable to check the temporal information packet that the server returns, analyze, and generates the NTP times
With the difference of local zone time, and then to local zone time be adjusted realization synchronize.
2. the time calibration in network service based on NTP and assessment system as described in claim 1, which is characterized in that when including network
Between server clock source information management module, the quantity, preferential for showing and managing network time server external control clock source
Grade essential information；
The server includes server end time service precision monitoring modular, for display server end main frame time, ntp server
Source address, current ntp server grade, monitoring server end main frame clock jitter, clock jitter, communication delay, time jitter
Information, and by monitoring result with 1 day for periodic report, and form report and curve, if server end host is offline, provide alarm
Function；
The client includes client time service precision monitoring modular, for showing client host time, ntp server source
Location, current ntp server grade, monitoring client host clock jitter, clock jitter, communication delay, time jitter, frequency are inclined
Difference, frequency drift information, and by monitoring result with 1 day for periodic report, and form report and curve, if client host from
Line provides warning function.
3. a kind of time calibration in network service and appraisal procedure based on NTP, which is characterized in that include the following steps：
Meet the NTP Query Information packets of consensus standard as claim 1-2 any one of them clients generate, and be sent to as
Claim 1-2 any one of them servers；
The server-side receives the NTP Query Informations packet that the client is sent, by Network Time Protocol specification, from it is local when
Between generate and NTP information packets and send back to the client；
The client checks the temporal information packet that the server returns, is analyzed, and generate the NTP times with it is local when
Between difference, and then to local zone time be adjusted realization synchronize.
4. the time calibration in network service based on NTP and appraisal procedure as claimed in claim 3, which is characterized in that further include：
The client carries out in analytic process the NTP information packets that the server returns, and also to carry out network
The estimation of time delay.
5. the time calibration in network service based on NTP and assessment system as claimed in claim 4, which is characterized in that the client
The temporal information packet that the server returns is checked, is analyzed, and generates the difference of NTP times and local zone time, in turn
Local zone time is adjusted and realizes that synchronous step specifically includes offset measurement stage and delay measurements stage；
Network Time Protocol is based on UDP, defines four kinds of clock messages：Sync message Sync, it delay request message Delay_Req, follows
Message Follow_Up and delay request response message Delay_Resp.
6. the time calibration in network service based on NTP and assessment system as claimed in claim 5, which is characterized in that the offset is surveyed
The amount stage is used for correcting the time difference of master and slave clock；The offset measurement stage, include the following steps：
1) master clock sends sync message Sync to from clock, includes a timestamp in message, it is pre- to indicate that message is issued
Between timing；
2) master clock follows message Follow_Up, message after sync message Sync is sent, then to sending one from clock
In include a timestamp, indicate that the true of sync message sends out time T1；
3) after clock receives sync message Sync, receiving time T2 is recorded；
The offset measurement stage has detached message transmissions and the time measures, and does not influence between each other；
The network delay of master-salve clock is denoted as Delay1, the correct time offset of master-salve clock is denoted as Offset, then from clock
According to the T1 and receiving time T2 followed in message Follow_Up, it can be deduced that：
T2-T1=Offset+Delay1.
7. the time calibration in network service based on NTP and assessment system as claimed in claim 6, which is characterized in that the delay is surveyed
The amount stage is for measuring time delay caused by network transmission；The delay measurements stage, include the following steps：
1) after clock receives sync message Sync, delay request message Delay_Req is sent to master clock at the T3 moment；
2) after master clock receives delay request message Delay_Req, delay request response message Delay_ is sent to from clock
Resp, message accounting master clock accurate receiving time T4；
The network delay of master-salve clock is denoted as Delay2, the correct time offset of master-salve clock
It is denoted as Offset, then from clock according to the sending time T3 and delay request response report of delay request message Delay_Req
The time T4 recorded in literary Delay_Resp, it can be deduced that：
T3-Offset+Delay2=T4, namely：
T4-T3=Delay2-Offset
Assuming that the network delay Delay1 in offset measurement stage is equal with the Delay2 in delay measurements stage, i.e. Delay1=
Delay2=Delay, it can be deduced that：
Delay=[(T2-T1)+(T4-T3)]/2
Offset=[(T2-T1)-(T4-T3)]/2.
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| CN108667547A (en) * | 2018-08-10 | 2018-10-16 | 电信科学技术第五研究所有限公司 | A kind of Network Time Protocol conversion method and system |
| CN110620939A (en) * | 2019-10-18 | 2019-12-27 | 北京达佳互联信息技术有限公司 | Network state determination method and device, electronic equipment and storage medium |
| CN111585685A (en) * | 2020-05-15 | 2020-08-25 | 南京艾科朗克信息科技有限公司 | Counter system time calibration method based on UDP incremental market |
| CN112187560A (en) * | 2020-07-22 | 2021-01-05 | 中国计量科学研究院 | NTP network time service evaluation system, method and time service evaluation device |
| CN113541846A (en) * | 2021-09-17 | 2021-10-22 | 电信科学技术第五研究所有限公司 | Method and system for monitoring network time synchronization performance |
| CN113589675A (en) * | 2021-08-10 | 2021-11-02 | 贵州省计量测试院 | Network time synchronization method and system with traceability |
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| CN114553354A (en) * | 2021-12-16 | 2022-05-27 | 深圳市太铭科技有限公司 | Method for keeping clock synchronization of NTP (network time protocol) server |
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| CN115865256A (en) * | 2022-12-06 | 2023-03-28 | 国网四川省电力公司营销服务中心 | Method and system for measuring time error between communication nodes based on broadband power carrier |
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| CN117560110A (en) * | 2024-01-12 | 2024-02-13 | 深圳市太铭科技有限公司 | NTP time service method and system for high access request |
| CN117875093A (en) * | 2024-03-13 | 2024-04-12 | 北京航天拓扑高科技有限责任公司 | Online dynamic assembly method of virtual-real model machine |
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| CN108667547A (en) * | 2018-08-10 | 2018-10-16 | 电信科学技术第五研究所有限公司 | A kind of Network Time Protocol conversion method and system |
| CN110620939A (en) * | 2019-10-18 | 2019-12-27 | 北京达佳互联信息技术有限公司 | Network state determination method and device, electronic equipment and storage medium |
| CN110620939B (en) * | 2019-10-18 | 2021-08-13 | 北京达佳互联信息技术有限公司 | Network state determination method and device, electronic equipment and storage medium |
| CN111585685A (en) * | 2020-05-15 | 2020-08-25 | 南京艾科朗克信息科技有限公司 | Counter system time calibration method based on UDP incremental market |
| CN112187560A (en) * | 2020-07-22 | 2021-01-05 | 中国计量科学研究院 | NTP network time service evaluation system, method and time service evaluation device |
| CN113589675A (en) * | 2021-08-10 | 2021-11-02 | 贵州省计量测试院 | Network time synchronization method and system with traceability |
| CN113541846A (en) * | 2021-09-17 | 2021-10-22 | 电信科学技术第五研究所有限公司 | Method and system for monitoring network time synchronization performance |
| CN114253348A (en) * | 2021-12-10 | 2022-03-29 | 广西电网有限责任公司电力科学研究院 | Method for preventing conflict of editing information under online cooperation of multiple persons |
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| CN114553354A (en) * | 2021-12-16 | 2022-05-27 | 深圳市太铭科技有限公司 | Method for keeping clock synchronization of NTP (network time protocol) server |
| WO2023115258A1 (en) * | 2021-12-20 | 2023-06-29 | 华为技术有限公司 | Message transmission method and corresponding device |
| CN114448547A (en) * | 2021-12-31 | 2022-05-06 | 上海思源弘瑞自动化有限公司 | Time synchronization method and device, electronic equipment and storage medium |
| CN114567579A (en) * | 2022-03-01 | 2022-05-31 | 武汉心驰神往科技有限公司 | Frame synchronization global quality monitoring method and device and readable access medium |
| CN114785445A (en) * | 2022-06-20 | 2022-07-22 | 中国空气动力研究与发展中心低速空气动力研究所 | Clock synchronization implementation method of wind tunnel pressure measurement system |
| CN114785445B (en) * | 2022-06-20 | 2022-09-09 | 中国空气动力研究与发展中心低速空气动力研究所 | Clock synchronization implementation method of wind tunnel pressure measurement system |
| CN115208806A (en) * | 2022-07-07 | 2022-10-18 | 电信科学技术第五研究所有限公司 | Method and device for testing response capability of NTP (network time protocol) server |
| CN115208806B (en) * | 2022-07-07 | 2024-04-30 | 电信科学技术第五研究所有限公司 | Method and device for testing NTP server response capability |
| CN115865256A (en) * | 2022-12-06 | 2023-03-28 | 国网四川省电力公司营销服务中心 | Method and system for measuring time error between communication nodes based on broadband power carrier |
| CN117560110A (en) * | 2024-01-12 | 2024-02-13 | 深圳市太铭科技有限公司 | NTP time service method and system for high access request |
| CN117560110B (en) * | 2024-01-12 | 2024-04-26 | 深圳市太铭科技有限公司 | NTP time service method and system for high access request |
| CN117875093A (en) * | 2024-03-13 | 2024-04-12 | 北京航天拓扑高科技有限责任公司 | Online dynamic assembly method of virtual-real model machine |
| CN117938300A (en) * | 2024-03-21 | 2024-04-26 | 中大智能科技股份有限公司 | High-precision time service method for sensor network |
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Application publication date: 20180724 |