CN102148652B - System and method for measuring network clock synchronization - Google Patents
System and method for measuring network clock synchronization Download PDFInfo
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- CN102148652B CN102148652B CN201110039783.0A CN201110039783A CN102148652B CN 102148652 B CN102148652 B CN 102148652B CN 201110039783 A CN201110039783 A CN 201110039783A CN 102148652 B CN102148652 B CN 102148652B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/14—Monitoring arrangements
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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
- H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
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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
- H04J3/0644—External master-clock
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Abstract
The invention discloses a system for measuring network clock synchronization, is applied to the communication and smart grid fields. The system comprises a pulse countering module, a time counting module, a clock reference module and a synchronization calculation module, wherein the pulse counting module calculates pulse frequency difference between a master clock and a slave clock, the master clock is synchronous with a remote reference clock, and the slave clock is synchronous with the master clock through a network so as to be synchronous with the remote reference clock; the time counting module measures the time difference between the master clock and the slave clock; the clock reference module inputs a reference clock, and the reference clock is synchronous with the remote reference clock; and the synchronization calculating module is used for calculating network clock synchronization parameters according to the time difference and the pulse frequency difference and outputting time synchronization parameters. The system disclosed by the invention can be used for evaluating the clock frequency synchronization accuracy and the time synchronization accuracy which can be reached at each node by an IEEE1588PTP (Institute of Electrical and Electronics Engineers 1588 Peer To Peer) clock synchronous network, and important reference data is provided for clock synchronization network optimization, and performance prediction on application and equipment depending on clock synchronization.
Description
Technical field
The present invention relates to communication and intelligent grid field, relate in particular to a kind of system and method for measuring clock synchronization of ad.
Background technology
In informationalized society, relate to all conglomeraties that information is controlled and exchanged, the large-scale application software in information network, equipment of industrial product control system information transmission network especially for example, it is the basic demand of these information technology application systems that high-precision time service is provided for it.
Based on IEEE-1588 PTP (split-second precision agreement, Precision Time Protocol) clock synchronous/time dissemination system is Clock Synchronization Technology up-to-date, that the IP network of take is carrier, the time dissemination system of setting up based on IEEE-1588 split-second precision consensus standard can provide the time service precision of nanosecond in existing LAN.With respect to existing time dissemination system, based on IEEE-1588 time dissemination system, have advantages of that the landform of not being subject to limits and cost is low, broad covered area, available existing IP network is as supporting body.Advantage based on above, the clock synchronous/time dissemination system based on IEEE 1588 standards will become the mainstream solution of network high accuracy time dissemination system from now on.
But the master-salve clock synchronization precision that the clock synchronous/time dissemination system based on IEEE 1588 PTP (v1 and v2) can reach depends on 2 layers or configuration and the loading condition of 3 layer networks that carries clock message, also be IEEE1588 clock message from master clock (Grandmaster Clock) to the propagation path from clock (Slave Clock), IEEE1588 clock message 2 layer switch of process or the jumping figure of 3 layers of router, the height of background traffic, the existence of burst background traffic burr all can finally affect master-salve clock synchronization precision and whether reach nanosecond (ns), Microsecond grade (us) or Millisecond (ms).If master-salve clock synchronization precision can not reach the precision of expection, relevant information system or the performance of equipment will be had a strong impact on, even cisco unity malfunction.Therefore,, for information system provides high-precision master-salve clock synchronization measuring technique so that clock synchronous/time dissemination system carries out clock alignment in time, thereby obtain more high-precision output clock, necessitate.
Summary of the invention
For better clock synchronous or time dissemination system are provided, the embodiment of the present invention provides a kind of system and method for measuring clock synchronization of ad, for the error measure of IEEE1588 PTP (v1 and v2) clock synchronization of ad provides a good solution, to solve how this major issue of output accuracy of critic network clock synchronous, provide prerequisite condition.
In order to realize aforementioned goal of the invention, a kind of system of measuring clock synchronization of ad that the embodiment of the present invention provides is to realize by following technical scheme:
Measure a system for clock synchronization of ad, described system comprises:
Pulse counter module, is used for calculating master clock and poor from the pulse number of clock, and described master clock is synchronizeed with long-range reference clock, thereby describedly from clock, by network, synchronizes with long-range reference clock synchronous with master clock;
Time counting module, is used for calculating described master clock and from time difference of clock;
Clock reference module, is used for input reference clock, and described reference clock is synchronizeed with described long-range reference clock;
Synchronous computing module, is used for according to described time difference and the poor calculating of carrying out clock synchronization of ad parameter of pulse number, output time synchronization parameter.
In order to realize goal of the invention of the present invention, the embodiment of the present invention also provides the system of another kind of measurement clock synchronization of ad, by following technical scheme, realizes:
Measure a system for clock synchronization of ad, described system comprises:
Clock reference module, is used for input reference clock, and described reference clock is synchronizeed with described long-range reference clock;
Time error computing module, is used for calculating the time error of local system time and described reference clock;
Time counting module, is used for record respectively from the sending and receiving timestamp of the synchronised clock message of two master clocks, and calculates respectively unidirectional message transfer time according to described time error and timestamp;
Synchronous computing module, is used for, according to described unidirectional message transfer time, carrying out the calculating of clock synchronization of ad parameter.
In order to realize goal of the invention of the present invention, the embodiment of the present invention also provides a kind of method of measuring clock synchronization of ad, by following technical scheme, realizes:
Measure a method for clock synchronization of ad, described method comprises the steps:
Calculate master clock and poor from the pulse number of clock, described master clock is synchronizeed with long-range reference clock, from clock, by network, synchronizes with master clock;
Calculate described master clock and from time difference of clock;
According to the input of reference clock, synchronize with described long-range reference clock;
According to described time difference and the poor calculating of carrying out clock synchronization of ad parameter of pulse number, output time synchronization parameter.
In order to realize aforesaid goal of the invention, the embodiment of the present invention also provides the method for another kind of measurement clock synchronization of ad, realizes by the following technical solutions:
Measure a method for clock synchronization of ad, described method comprises the steps:
According to the input of reference clock, carry out and the synchronizeing of described long-range reference clock;
Record is respectively from the sending and receiving timestamp of the synchronised clock message of two master clocks;
Calculate the time error of local system time and described reference clock;
According to transmission time stamp and the time error of described message, calculate respectively unidirectional message transfer time;
According to described unidirectional message transfer time, carry out the calculating of clock synchronization of ad parameter.
The above embodiment of the present invention can be used to assess clock frequency synchronization accuracy and the timing tracking accuracy (can reach the certainty of measurement below ns level) that an IEEE1588 clock synchronous network can reach at each node, and measurement result becomes the reference that clock synchronous network is optimized.To depending on the application of clock synchronous and the performance prediction of equipment provides important reference data.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described:
Fig. 1 is the system schematic that the embodiment of the present invention 1 is measured clock synchronization of ad;
Fig. 2 is the network architecture figure that the embodiment of the present invention 2 is measured the general clock signal measurement pattern of clock synchronization of ad;
Fig. 3 is the network architecture figure that the embodiment of the present invention 3 is measured clock synchronization of ad clock synchronization compliant with precision time protocol signal measurement pattern;
Fig. 4 is the another kind of system schematic of measuring clock synchronization of ad of the embodiment of the present invention 4;
Fig. 5 is the network architecture figure that the embodiment of the present invention 5 is measured clock synchronization of ad PTP message measurement pattern;
Fig. 6 is 6 one kinds of method flow diagrams of measuring clock synchronization of ad of the embodiment of the present invention;
Fig. 7 is the another kind of method flow diagram of measuring clock synchronization of ad of the embodiment of the present invention 7.
Embodiment
As shown in Figure 1, a kind of system of measuring clock synchronization of ad that the embodiment of the present invention 1 provides, described system comprises:
Pulse counter module, is used for calculating master clock and poor from the pulse number of clock, and described master clock is synchronizeed with long-range reference clock, from clock, by network, synchronizes with master clock;
Time counting module, is used for calculating described master clock and from time difference of clock;
Clock reference module, is used for input reference clock, and described reference clock is synchronizeed with described long-range reference clock;
Synchronous computing module, is used for according to described time difference and the poor calculating of carrying out clock synchronization of ad parameter of pulse number, output time synchronization parameter.
Further preferably, the reference clock of described long-range reference clock comprises gps clock or Beidou satellite system clock.
Further preferably, described master clock and comprise described pulse number and time from the timing parameter of clock.
In mobile communication (as GSM, TD-SCDMA, LTE), electric power (as intelligent grid), in the construction of the clock synchronous network of finance (as high frequency transaction system) and maintenance, the embodiment of the present invention can be used as a high-precision clock synchronization accuracy survey tool, and tool has been widely used.
As shown in Figure 2, the system of the embodiment of the present invention 2 based on above-mentioned measurement clock synchronization of ad, realizes by following embodiment:
General clock signal measurement pattern: pulse counter module and time counting module are respectively to the two-way PPS (pulse per second (PPS) being input to, Pulse per Second) and two-way TOD (Time of Day, real-time elapsed time clock) measure respectively, obtain between two pulse signals the time error at each signal pulse.
Between two-way PPS, relatively provide nanosecond error measure, between two-way TOD data, relatively provide a second level error measure.Two-way PPS/TOD Zhong Yi road is as with reference to signal, and a road is as measured signal, and reference signal can be from GPS/ big dipper clock synchro system, atomic clock, or the PPS/TOD of PTP master clock output, and measured signal can carry out the output since clock PPS/TOD.
The time error at each signal pulse between the two paths of signals measuring of take is input, general clock signal measurement pattern can be according to ITU-T G.810[2] method and the formula of regulation produce: TIE (time interval error, Time Interval Error), MTIE (maximum time interval error, Maximum Time Interval Error), the statisticses such as TDEV (time migration, Time Deviation) and Frequency Offset (frequency shift (FS)).
The specific works step of general clock signal measurement pattern is as follows:
1. PTP is synchronous by network and PTP master clock from clock;
2. its clock reference module of measuring the system of clock synchronization of ad of the embodiment of the present invention 2 use locks an external reference PPS consistent with PTP master clock and ToD (as GPS or Beidou satellite system);
3. count respectively with reference to PPS and an other road PPS to be measured on pulse counter module Dui Yi road, from the difference of two-way counting, obtains nanosecond (ns) other time error of level;
4. decode respectively with reference to ToD and an other road ToD to be measured in time counting module Dui Yi road, from the difference of two-way ToD input, obtains second level other time error (Clock Offset);
5. synchronous computing module is according to ITU-T G.810[2] calculate TIE, MTIE, TDEV and Frequency Offset.
As shown in Figure 3, the system of the embodiment of the present invention 3 based on above-mentioned measurement clock synchronization of ad, realizes by following embodiment:
Clock synchronization compliant with precision time protocol signal measurement pattern: the outside PPS/TOD master clock signal in Yi Yi road is as with reference to clock signal, derived reference signal must be consistent with far-end PTP master clock, as GPS or big-dipper satellite clock system, clock synchronization compliant with precision time protocol signal measurement pattern is passed through embedded PTP from clock, the IEEE1588v2 sync message that network is sent is analyzed, and trial is synchronizeed with far-end PTP master clock, last using embedded PTP from the output of clock as clock to be measured, thereby obtain (the every pps pulse per second signal sampling) time error between reference clock and clock to be measured.
The time dependent error between the reference clock that measures and clock to be measured of take is input, clock synchronization compliant with precision time protocol signal measurement pattern can be according to ITU-T G.810[2] method and the formula of regulation produce TIE, MTIE, TDEV, PDV (Packet Delay Variation) etc., this measurement pattern can be used for assessing clock (frequency/time) synchronization accuracy that a master-slave synchronisation network path can reach.
The specific works step of clock synchronization compliant with precision time protocol signal measurement pattern is as follows:
1. the embodiment of the present invention 3 is measured the system of clock synchronization of ad, and it is embedded from clock, utilizes protocol stack to pass through network clocking message and a PTP master clock synchronous interaction;
2. embeddedly from clock, the message receiving from the IEEE1588v2 master clock of a clock synchronous network is carried out filtering and calculates principal and subordinate's time error (Clock Offset);
3. embeddedly from clock, local clock is calibrated, made local clock locking far-end PTP master clock, carry out synchronous;
4. pulse counter module is counted the pulse signal input of an external reference clock PPS (as GPS or Beidou satellite system) consistent with PTP master clock, thereby obtains nanosecond (ns) other time error of level of local zone time and external reference clock;
5. time counting module is decoded to the ToD input of outside reference clock PPS, and compares with local zone time, thereby obtains other time error of level second (s) of local zone time and external reference clock;
6. synchronous computing module is according to ITU-T G.810[2] calculate TIE, MTIE, TDEV and PDV.
The above embodiment of the present invention can be used to assess clock frequency synchronization accuracy and the timing tracking accuracy (can reach the time precision of ns level) that an IEEE1588 clock synchronous network can reach at each node, and measurement result becomes the reference that clock synchronous network is optimized.To depending on the application of clock synchronous and the performance prediction of equipment provides important reference data.
As shown in Figure 4, the embodiment of the present invention 4 also provides the system of another kind of measurement clock synchronization of ad, described in comprise:
Clock reference module, is used for input reference clock, and described reference clock is synchronizeed with described long-range reference clock;
Time error computing module, is used for calculating the time error of local system time and described reference clock;
Time counting module, is used for record respectively from the sending and receiving timestamp of the synchronised clock message of two master clocks, and calculates respectively unidirectional message transfer time according to described time error and timestamp;
Synchronous computing module, is used for, according to described unidirectional message transfer time, carrying out the calculating of clock synchronization of ad parameter.
Above clock synchronization parameters, comprises the maximum average frequency error of two master clocks.
Further preferably, described two master clocks are synchronizeed with same long-range reference clock.
As shown in Figure 5, the embodiment of the present invention 5 is measured the system of clock synchronization of ad, by following embodiment, realizes:
PTP message measurement pattern: using GPS or big-dipper satellite clock system as with reference to clock, by embedded PTP from clock module, carry out alternately with two far-end PTP master clocks simultaneously, and measure respectively two far-end PTP master clocks and embedded PTP and propagate One Way Delay (Master-to-Slave One Way Delay) and PDV from the message between clock, the time dependent message propagation delay measuring of take is input, predicts the MAFE (Maximum Average Frequency Error) of two far-end PTP master clocks.
The specific works step of PTP message measurement pattern is as follows:
1. the embodiment of the present invention 4 is measured the system of clock synchronization of ads, and one of its clock reference module locking and two PTP master clocks 100 and 200 are PPS and the ToD (as GPS or Beidou satellite system) of consistent external reference clock all
2. embedded mutual respectively by network and two PTP master clocks 100 and 200 from clock;
3. time error computing module is counted outside reference clock PPS, and continuous updating local clock is with respect to the time error (being designated as Clock_Offset_vs_Ref) of external reference clock
4. time counting module records respectively from the transmission (t1) of the synchronised clock message of two PTP master clocks and receives (t2) timestamp and (is designated as respectively t1 (A), t2 (A) and t1 (B), and by following formula, calculate respectively the OWD (being designated as respectively Real_OWD_A and Real_OWD_B) of two master clock directions t2 (B)):
Real_OWD_A = t2(A) - t1(A) - Clock_Offset_vs_Ref
Real_OWD_B = t2(B) - t1(B) - Clock_Offset_vs_Ref
5. take time dependent Real_OWD_A and Real_OWD_B as input, the method for describing according to the relevant criterion of report transmission network is calculated respectively the MAFE. of two PTP master clocks
By above embodiment, the invention provides that assessment is a pair of carries out the PTP master clock of remote synchronization and PTP from the high precision measuring system of the clock synchronous error between clock by network, and be applicable to different application scenarioss, and provide the measuring system of use precision clock reference consistent with PTP master clock, realized the unilateral network time delay between master-salve clock (One Way Delay), shake, and the accurate measurement (can reach nanosecond rank) of time dependent time synchronization error (Clock Offset) between master-salve clock. and take these measurement data as basis, according to ITU-T G.810[2] method of regulation and formula produce TIE, MTIE, TDEV, MAFE, PDV (Packet Delay Variation) etc. calculate and statistics.
As shown in Figure 6, the embodiment of the present invention 6 also provides a kind of method of measuring clock synchronization of ad, said method comprising the steps of:
S101. calculate master clock and poor from the pulse number of clock, described master clock is synchronizeed with long-range reference clock, describedly from clock, by network, synchronizes with described master clock;
S102. calculate described master clock and from time difference of clock;
S103. according to the input of reference clock, synchronize with described long-range reference clock;
S104. according to described time difference and the poor calculating of carrying out clock synchronization of ad parameter of pulse number, output time synchronization parameter.
Further preferably, the reference clock of described long-range reference clock comprises gps clock or Beidou satellite system clock.
Further preferably, described master clock and comprise described pulse number and time from the timing parameter of clock.
Further preferably, described master clock and being present in a clock synchronous network from clock, carries out general clock signal measurement pattern, and the embodiment of the present invention repeats no longer one by one;
Further preferably, described master clock is present in master network, and the described system that is embedded in described measurement clock synchronization of ad from clock is carried out the measurement pattern of clock synchronization compliant with precision time protocol signal, and the embodiment of the present invention repeats no longer one by one.
Further preferably, described master clock and the time that is master clock from time difference of clock and the time difference of local zone time, described local zone time is the time of described system and described long-range reference clock calibration gained, and described pulse number is poor is that the pulse reference clock number of times of main clock pulse number of times and described system is poor.
Further preferably, described time synchronized parameter comprises time interval error, maximum time interval error, time migration, message time delay skew or frequency shift (FS).
As shown in Figure 7, the embodiment of the present invention 7 provides the method for another kind of measurement clock synchronization of ad, said method comprising the steps of:
S201. according to the input of reference clock, carry out and the synchronizeing of described long-range reference clock;
S202. record is respectively from the sending and receiving timestamp of the synchronised clock message of two master clocks, and calculates respectively message transfer time;
S203. calculate the time error of local system time and described reference clock;
S204. according to transmission time stamp and the time error of described message, calculate the message one-way transmission time, and according to the described message one-way transmission time, carry out the calculating of clock synchronization of ad parameter.
Above clock synchronization parameters, comprises the maximum average frequency error of two master clocks.
Above embodiment is undertaken by PTP message measurement pattern, repeats no longer one by one.Further preferably, described two master clocks, from clock, synchronize respectively with long-range reference clock, further, described long-range reference clock comprises GPS/ big dipper clock synchro system, atomic clock, or the PPS/TOD of PTP master clock output.
By above embodiment, the invention provides that assessment is a pair of carries out the PTP master clock of remote synchronization and PTP from the high-precision measuring method of the clock synchronous error between clock by network, and be applicable to different application scenarioss, and provide the method for measurement of use precision clock reference consistent with PTP master clock, realized the unilateral network time delay between master-salve clock (One Way Delay), shake, and the accurate measurement (can reach nanosecond rank) of time dependent time synchronization error (Clock Offset) between master-salve clock. and take these measurement data as basis, according to ITU-T G.810[2] method of regulation and formula produce TIE, MTIE, TDEV, MAFE, PDV (Packet Delay Variation) etc. calculate and statistics.
Those skilled in the art will recognize that; above-mentioned embodiment is exemplary; in order to make those skilled in the art can better understand this patent content; should not be understood as the restriction to this patent protection range; so long as disclose spiritual do any according to this patent, be equal to change or modify, all falling into this patent protection range.
Claims (10)
1. a system of measuring clock synchronization of ad, is characterized in that, described system comprises:
Pulse counter module, is used for calculating master clock and poor from the pulse number of clock, and described master clock is synchronizeed with long-range reference clock, describedly from clock, by network, synchronizes with master clock;
Time counting module, is used for measuring described master clock and from time difference of clock;
Clock reference module, is used for input reference clock, and described reference clock is synchronizeed with described long-range reference clock;
Synchronous computing module, is used for according to described time difference and the poor calculating of carrying out clock synchronization of ad parameter of pulse number, output time synchronization parameter.
2. the system of measurement clock synchronization of ad according to claim 1, is characterized in that, the reference clock of described long-range reference clock comprises gps clock or Beidou satellite system clock.
3. the system of measurement clock synchronization of ad according to claim 2, it is characterized in that, the system of described master clock and described measurement clock synchronization of ad is present in a clock synchronous network, the described system that is embedded in described measurement clock synchronization of ad from clock.
4. the system of measurement clock synchronization of ad according to claim 3, it is characterized in that, described master clock and the time that is master clock from time difference of clock and the time difference of local zone time, described local zone time is the time of described system and described long-range reference clock calibration gained, and described pulse number is poor is that the pulse reference clock number of times of main clock pulse number of times and described system is poor.
5. according to the system of the measurement clock synchronization of ad described in claim 1 to 4 any one, it is characterized in that, described time synchronized parameter comprises time interval error, maximum time interval error, time migration, message time delay skew or frequency shift (FS).
6. a method of measuring clock synchronization of ad, is characterized in that, described method comprises:
Calculate master clock and poor from the pulse number of clock, described master clock is synchronizeed with long-range reference clock, describedly from clock, by network, synchronizes with described master clock;
Calculate described master clock and from time difference of clock;
According to the input of reference clock, synchronize with described long-range reference clock;
According to described time difference and the poor calculating of carrying out clock synchronization of ad parameter of pulse number, output time synchronization parameter.
7. the method for measurement clock synchronization of ad according to claim 6, is characterized in that, the reference clock of described long-range reference clock comprises gps clock or Beidou satellite system clock.
8. the method for measurement clock synchronization of ad according to claim 7, it is characterized in that, the system of described master clock and described measurement clock synchronization of ad is present in a clock synchronous network, the described system that is embedded in described measurement clock synchronization of ad from clock.
9. the method for measurement clock synchronization of ad according to claim 8, it is characterized in that, described master clock and the time that is master clock from time difference of clock and the time difference of local zone time, described local zone time is the time of described system and described long-range reference clock calibration gained, and described pulse number is poor is that the pulse reference clock number of times of main clock pulse number of times and described system is poor.
10. according to the method for the measurement clock synchronization of ad described in claim 6 to 9 any one, it is characterized in that, described time synchronized parameter comprises time interval error, maximum time interval error, time migration, message time delay skew or frequency shift (FS).
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| CN114157376B (en) * | 2020-09-08 | 2023-11-28 | 中车株洲电力机车研究所有限公司 | Clock synchronization and fault feedback method and device |
| CN113890764B (en) * | 2021-10-08 | 2023-05-09 | 中国电子科技集团公司第三十研究所 | Time synchronization system with prediction function and safety monitoring method and device thereof |
| CN114500317B (en) * | 2022-02-10 | 2024-04-30 | 中国铁道科学研究院集团有限公司 | Method and device for comprehensively detecting train clock synchronous network test |
| CN115189796B (en) * | 2022-09-08 | 2022-12-06 | 广州世炬网络科技有限公司 | Equipment master clock synchronization method and device based on IEEE1588 protocol |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1131884A (en) * | 1994-12-02 | 1996-09-25 | 株式会社日立制作所 | Radio paging system |
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| FI20001298A (en) * | 2000-05-30 | 2001-12-01 | Nokia Networks Oy | Synchronizing frame transmissions over a telecommunications network |
| FI20030998A0 (en) * | 2003-07-02 | 2003-07-02 | Nokia Corp | Network measurements in a radio telecommunications network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1131884A (en) * | 1994-12-02 | 1996-09-25 | 株式会社日立制作所 | Radio paging system |
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