CN110138487B - Time noise transfer characteristic measurement method and network node - Google Patents
Time noise transfer characteristic measurement method and network node Download PDFInfo
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- CN110138487B CN110138487B CN201810133981.5A CN201810133981A CN110138487B CN 110138487 B CN110138487 B CN 110138487B CN 201810133981 A CN201810133981 A CN 201810133981A CN 110138487 B CN110138487 B CN 110138487B
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- 238000004891 communication Methods 0.000 claims description 29
- 230000005540 biological transmission Effects 0.000 claims description 7
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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
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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
- H04J3/067—Details of the timestamp structure
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Abstract
The embodiment of the invention discloses a method for measuring time noise transfer characteristics and a network node, wherein the method comprises the following steps: acquiring a reference clock signal; acquiring messages sent by other network nodes, generating noise, overlapping the noise to an original time stamp of the message, and synchronizing clocks of the other network nodes according to the time stamp after overlapping the noise to obtain a recovered clock signal carrying the noise; noise transfer information is obtained from the reference clock signal and the recovered clock signal. According to the embodiment of the invention, noise is locally generated, the noise is superimposed on the original timestamp of the received main network node message, then the clock of the main network node is synchronized according to the tampered timestamp to obtain a recovered clock signal carrying the noise, the clock source signal is locked to obtain a reference clock signal, and the gain of the noise, namely the noise transfer information, is obtained according to the reference clock signal and the recovered clock signal. The external expensive measuring instrument is not needed to measure the transfer characteristic of the time noise, and the cost is low.
Description
Technical Field
The embodiment of the invention relates to the technical field of network communication, in particular to a time noise transfer characteristic measurement method and a network node.
Background
In a communication network, the proper operation of many services requires network clock synchronization, i.e. the time or frequency differences between devices throughout the network remain within reasonable error levels. The precision time protocol (Precision Time Protocol, PTP) is a time-synchronized protocol, which is used for high-precision time synchronization between devices. There are severe restrictions on the transfer of noise in a communication system, where each network node needs to filter the noise. PTP, however, is an important component of a communication system, and the noise characteristics of the output time thereof are also strictly required. At present, a special instrument is used for measuring the transmission characteristics of PTP noise, but the instrument is high in price and high in cost.
Disclosure of Invention
The embodiment of the invention aims to provide a time noise transfer characteristic measuring method and a network node with low measuring cost.
In a first aspect, an embodiment of the present invention provides a method for measuring temporal noise transfer characteristics, where the method is used for a network node, where the network node is communicatively connected to at least one other network node, and the network node is used as a slave network node, and the method includes:
acquiring a reference clock signal, wherein the reference clock signal is obtained by locking a clock source signal;
acquiring messages sent by other network nodes, generating noise, overlapping the noise to an original time stamp of the messages, synchronizing clocks of the other network nodes according to the time stamp after overlapping the noise, and obtaining a recovered clock signal carrying the noise, wherein the other network nodes also lock the clock source signal;
and obtaining noise transfer information between the other network nodes and the network nodes according to the reference clock signal and the recovered clock signal carrying noise.
Optionally, the obtaining noise transfer information between the other network node and the network node according to the reference clock signal and the recovered clock signal carrying noise includes:
obtaining a time difference value between the reference clock signal and the recovered clock signal carrying noise;
sampling to obtain a plurality of time difference values, and obtaining a phase difference curve according to the plurality of time difference values;
and obtaining the peak value of the phase difference curve, and obtaining the noise transfer information according to the peak value and the original noise.
Optionally, the adding the noise to the original timestamp of the message includes:
and superposing a value corresponding to the noise phase when the message is received to an original time stamp of the message.
Optionally, the synchronizing clocks of the other network nodes according to the time stamp after the noise superposition to obtain a recovered clock signal carrying noise includes:
synchronizing clocks of other network nodes according to the time stamp after the noise superposition, and filtering the obtained clock signals to obtain recovered clock signals carrying noise;
the method further comprises the steps of:
transmitting the noise transfer information to a display device to cause the display device to display the noise transfer information;
and/or the number of the groups of groups,
and correcting the filtered parameters according to the noise transfer information.
In a second aspect, an embodiment of the present invention provides a network node, the network node comprising:
the communication transceiver is used for receiving the clock source signal and receiving and transmitting messages;
the first locking unit is electrically connected with the communication transceiver and is used for locking a clock source signal to obtain a reference clock signal;
a noise generator for generating noise;
the second locking unit is respectively and electrically connected with the communication receiving and transmitting device and the noise generator, and is used for acquiring messages sent by other network nodes received by the communication receiving and transmitting device, superposing noise generated by the noise generator on an original time stamp of the messages, synchronizing clocks of the other network nodes according to the time stamp superposed with the noise, and obtaining a recovered clock signal, wherein the other network nodes also lock the clock source signal;
the time comparison unit is respectively and electrically connected with the first locking unit and the second locking unit and is used for acquiring the time difference value of the reference clock signal and the recovered clock signal;
and the controller is electrically connected with the time comparison unit and is used for sampling the time difference value and obtaining noise transmission information between the network node and the other network nodes according to each sampling value.
Optionally, the network node further includes a filter electrically connected between the second locking unit and the time comparing unit, the filter is configured to filter noise in the recovered clock signal, the controller is further electrically connected to the filter, and the controller is further configured to correct parameters of the filter according to the noise transmission information.
Optionally, the controller is further communicatively connected to a display device, so that the display device displays the noise transfer information.
Optionally, the clock source signal is a GPS clock signal;
the first locking unit is a phase-locked loop circuit;
the time comparison unit is a comparator.
In a third aspect, an embodiment of the present invention provides a network node, the network node comprising:
the communication transceiver is used for receiving the clock source signal and receiving and transmitting messages;
the first locking unit is electrically connected with the communication transceiver and is used for locking a clock source signal to obtain a reference clock signal;
the controller is respectively and electrically connected with the communication transceiver and the first locking unit;
the controller includes:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method described above.
In a fourth aspect, embodiments of the present invention provide a non-transitory computer-readable storage medium storing computer-executable instructions that, when executed by a network node, cause the network node to perform the above-described method.
In a fifth aspect, embodiments of the present invention provide a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a network node, cause the network node to perform the method of the first aspect.
The embodiment of the invention has the beneficial effects that: according to the embodiment of the invention, noise is locally generated at the slave network node, the noise is superimposed on the original timestamp of the received main network node message, and then the clock of the main network node is synchronized according to the tampered timestamp to obtain a recovered clock signal carrying the noise. The clock source signal is locked to obtain the reference clock signal, and because the slave network node and the master network node are both based on the same clock source signal, the gain of the noise, namely the noise transfer information from the master network node to the slave network node, can be obtained according to the reference clock signal and the recovered clock signal. The external expensive measuring instrument is not needed to measure the transfer characteristic of the time noise, and the cost is low.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic diagram of an application scenario of a measurement method provided by an embodiment of the present invention;
FIG. 2 is a schematic flow chart of one embodiment of the measurement method of the present invention;
FIG. 3 is a schematic flow chart of one embodiment of the measurement method of the present invention;
fig. 4 is a schematic hardware structure of a network node according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a hardware structure of a network node according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a hardware structure of a network node according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The method for measuring the time noise transfer characteristic provided by the embodiment of the invention can be used for measuring the PTP time noise transfer characteristic and is suitable for an application scene shown in figure 1. The application scenario includes a plurality of network nodes 10 and a reference clock source 20, where each network node 10 locks a clock source signal (e.g., locks a clock source signal through a phase-locked loop) sent by the reference clock source 20, and the reference clock source 20 is, for example, a global positioning system (Global Positioning System, GPS) clock source, a beidou satellite navigation system clock source, or the like.
Each network node 10 may be used as a PTP master network node for distributing the synchronization time, or as a PTP slave network node for receiving the synchronization time. The PTP master network node and PTP slave network node are both based on the same reference clock source 20. The PTP obtains a reference clock signal from a clock source signal sent by the network node locking the reference clock source 20, locally generates noise at the slave network node, superimposes the noise on an original timestamp of the received master network node message, synchronizes a clock of the PTP master network node according to the timestamp after superimposing the noise to obtain a recovered clock signal carrying the noise, and compares the reference clock signal with the recovered clock signal carrying the noise to obtain gain of the time noise, namely, transfer information of the time noise between the PTP master network node and the PTP slave network node.
Fig. 2 is a flow chart of a method for measuring temporal noise transfer characteristics according to the present invention, which can be performed by any network node 10 in fig. 1, where the network node 10 acts as a slave network node, as shown in fig. 2, and includes:
101: a reference clock signal is acquired, the reference clock signal being obtained by locking a clock source signal.
A first locking unit may be provided on the network node 10, where the reference clock signal is obtained by locking the clock source signal sent by the reference clock source 20 by the first locking unit, for example a phase locked loop circuit.
102: and acquiring messages sent by other network nodes, generating noise, overlapping the noise to an original time stamp of the messages, synchronizing clocks of the other network nodes according to the time stamp after overlapping the noise, and obtaining a recovered clock signal carrying the noise, wherein the other network nodes also lock the clock source signal.
The method for obtaining the recovered clock signal is the prior art, and can be obtained by adopting a request response mechanism or an end delay mechanism based on the PTP protocol, and the request response mechanism is taken as an example to describe how to superimpose noise on the original timestamp of the message.
The master network node sends a Sync message to the slave network node, and records the sending time t1; after receiving the message from the network node, the receiving time t2 is recorded. After the main network node sends the Sync message, the main network node sends a Follow_Up message carrying t 1. The slave network node sends a delay_req message to the master network node, and records the sending time t3; after receiving the message, the master network node records the receiving time t4. After receiving the delay_req message, the master network node replies a delay_resp message carrying t4. At this time, the slave network node has four time stamps t1 to t4, and the total round trip delay [ (t 2-t 1) + (t 4-t 3) ] between the master network node and the slave network node can be calculated by using the four time stamps, and if the network is symmetrical, the time deviation between the slave network node and the master network node is [ (t 2-t 1) + (t 4-t 3) ]/2, so that the recovered clock of the synchronous master network node can be obtained.
According to whether the Follow_Up message needs to be sent or not, the request response mechanism is divided into a single-step mode and a double-step mode, wherein in the single-step mode, the sending time stamp t1 of the Sync message is carried by the Sync message, the Follow_Up message is not sent, and in the double-step mode, the sending time stamp t1 of the Sync message is carried by the Follow_Up message.
Taking a single-step mode as an example, local noise can be superimposed on a timestamp t1 or t2 of a Sync message, specifically, after receiving the Sync message from a network node, a value corresponding to the current phase of the local noise can be extracted at a suitable sampling rate (to satisfy a nessee-specific law), and the value is superimposed on t1 or t2. In other embodiments, locally generated noise may also be superimposed on t3 or t4.
The method for obtaining the recovered clock signal can be used for obtaining the recovered clock signal carrying the noise according to the time stamp after the noise is superimposed, and optionally, the recovered clock signal carrying the noise can be further filtered to filter the noise in the signal.
103: and obtaining noise transfer information between the other network nodes and the network nodes according to the reference clock signal and the recovered clock signal carrying noise.
And comparing the reference clock signal with the recovered clock signal carrying noise to obtain the transfer characteristic of the noise because the reference clock signal and the recovered clock signal carrying noise are based on the same clock source signal. Specifically, the time difference between the reference clock signal and the recovered clock signal carrying noise may be obtained first, and then each time difference may be sampled to obtain a time difference curve. And obtaining the peak value of the time difference curve, and comparing the peak value with original noise to obtain the gain of the noise, namely noise transfer information.
According to the embodiment of the invention, noise is locally generated at the slave network node, the noise is superimposed on the original timestamp of the received main network node message, and then the clock of the main network node is synchronized according to the tampered timestamp to obtain a recovered clock signal carrying the noise. The clock source signal is locked to obtain the reference clock signal, and because the slave network node and the master network node are both based on the same clock source signal, the gain of the noise, namely the noise transfer information from the master network node to the slave network node, can be obtained according to the reference clock signal and the recovered clock signal. The external expensive measuring instrument is not needed to measure the transfer characteristic of the time noise, and the cost is low. And the noise is generated by adopting a software mode, the noise type is not limited by an instrument, and various different noises can be simulated.
Further, after the noise transfer information is obtained, the noise transfer information may also be displayed to provide a reference, or parameters for filtering the recovered clock signal may be modified directly according to the noise transfer information. It is also possible to both display the noise transfer information and to correct the filter parameters at the same time. Referring to fig. 3, in some embodiments of the method, the method further comprises, in addition to 101, 102, and 103:
104: the noise transfer information is transmitted to a display device so that the display device displays the noise transfer information.
The display device may be a personal computer, a communication terminal, or the like.
105: and correcting the filtered parameters according to the noise transfer information.
And correcting the filtering parameters according to the noise transmission information so that the filtering algorithm can better filter noise in the recovered clock signal. In the prior art, a special instrument is adopted to measure the transmission characteristics of time noise, and a measurement result is at a measurement end and cannot be directly utilized by each PTP network node. The noise transmission information obtained by the embodiment of the invention can be transmitted to the PTP slave network node in real time, so that the slave network node can directly correct the filter parameters of the measured object to form closed loop control.
The embodiment of the present invention further provides a network node, as shown in fig. 4, where the network node 10 includes a communication transceiver 11, a first locking unit 12, and a controller 13, where the communication transceiver 11 is electrically connected to the first locking unit 12, and the controller 13 is electrically connected to the communication transceiver 11 and the first locking unit 12 respectively. The communication transceiver 11 is configured to receive a clock source signal sent by the reference clock source 20, and receive and send a packet, and the first locking unit 12 is configured to lock the clock source signal to obtain the reference clock signal. The controller 13 is configured to control the communication transceiver 11 to receive a message sent by another network node, locally generate noise and superimpose the noise on an original timestamp of the message, synchronize clocks of the other network nodes according to the timestamp after the noise is superimposed to obtain a recovered clock signal carrying the noise, and obtain a reference clock signal and obtain transfer information of the time noise according to the reference clock signal and the recovered clock signal carrying the noise.
Specifically, the controller 13 includes:
one or more processors 131 and a memory 132, one processor 131 being exemplified in fig. 4. The processor 131 and the memory 132 may be connected by a bus or other means.
The memory 132 is used as a non-volatile computer readable storage medium for storing non-volatile software programs, non-volatile computer executable programs, and modules, such as program instructions/modules corresponding to the measurement method in the embodiments of the present application. The processor 131 executes various functional applications of the network node and data processing, i.e. implements the measurement method of the above-described method embodiments, by running non-volatile software programs, instructions and modules stored in the memory 132.
The memory 132 may include a storage program area that may store an operating system, at least one application program required for functions, and a storage data area; the storage data area may store data created from the use of the network node, etc. In addition, memory 132 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 132 may optionally include memory remotely located relative to processor 131, such remote memory being connectable to the network node through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more program modules are stored in the memory 132, which when executed by the one or more processors 131, perform the measurement method of any of the method embodiments described above, e.g., perform method steps 101-103 of fig. 1, and method steps 101-105 of fig. 3, described above.
According to the embodiment of the invention, noise is locally generated at the slave network node, the noise is superimposed on the original timestamp of the received main network node message, and then the clock of the main network node is synchronized according to the tampered timestamp to obtain a recovered clock signal carrying the noise. The clock source signal is locked to obtain the reference clock signal, and because the slave network node and the master network node are both based on the same clock source signal, the gain of the noise, namely the noise transfer information from the master network node to the slave network node, can be obtained according to the reference clock signal and the recovered clock signal. The external expensive measuring instrument is not needed to measure the transfer characteristic of the time noise, and the cost is low.
The network node can execute the measurement method provided by the embodiment of the application, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in this embodiment may be found in the methods provided in the embodiments of the present application.
In the above embodiment, the noise transfer information is obtained according to the reference clock signal and the recovered clock signal carrying noise, and the above functions are implemented by a method of using a software program, and the above functions may also be implemented by a hardware method, and fig. 5 is a schematic structural diagram of another network node provided in the embodiment of the present invention, as shown in fig. 5, where the network node 10 includes:
the device comprises a communication transceiver 11, a first locking unit 12, a second locking unit 14, a noise generator 16, a time comparison unit 15 and a controller 13, wherein the communication transceiver 11 is respectively and electrically connected with the first locking unit 12 and the second locking unit 14, the noise generator 16 is electrically connected with the second locking unit 14, the first locking unit 12 and the second locking unit 14 are respectively and electrically connected with the time comparison unit 15, and the time comparison unit 15 is electrically connected with the controller 13.
The communication transceiver 11 is configured to receive a clock source signal sent by the reference clock source 20, and receive and send a packet, the first locking unit 12 is configured to lock the clock source signal to obtain the reference clock signal, the noise generator 16 is configured to generate noise, the second locking unit 14 is configured to control the communication transceiver 11 to receive a packet sent by another network node, superimpose the noise generated by the noise generator 16 on an original timestamp of the packet, and synchronize clocks of the other network node according to the timestamp after the superimposed noise, so as to obtain a recovered clock signal. Specifically, the value corresponding to the noise phase when the message is received may be superimposed on the original timestamp of the message by superimposing the noise on the original timestamp of the message.
The time comparing unit 15 is configured to obtain a time difference value between the reference clock signal and the recovered clock signal. The controller 13 is configured to sample the time difference value, and obtain noise transfer information between the network node and the other network nodes according to each sampling value. Specifically, the controller 13 samples each time difference value to obtain a time difference value curve. And obtaining the peak value of the time difference curve, and comparing the peak value with original noise to obtain the gain of the noise, namely noise transfer information.
The first locking unit 12 may be a phase-locked loop circuit, the time comparing unit 15 may be a comparator, the second locking unit 14 may be a processor with a certain processing capability, and the controller 13 may be an MCU.
According to the embodiment of the invention, noise is locally generated at the slave network node, the noise is superimposed on the original timestamp of the received main network node message, and then the clock of the main network node is synchronized according to the tampered timestamp to obtain a recovered clock signal carrying the noise. The clock source signal is locked to obtain the reference clock signal, and because the slave network node and the master network node are both based on the same clock source signal, the gain of the noise, namely the noise transfer information from the master network node to the slave network node, can be obtained according to the reference clock signal and the recovered clock signal. The external expensive measuring instrument is not needed to measure the transfer characteristic of the time noise, and the cost is low.
Further, after obtaining the recovered clock signal, noise in the signal may be filtered, referring to fig. 6, in other embodiments of the network node, the network node 10 further includes a filter 17, and the filter 17 is electrically connected between the second locking unit 14 and the time comparing unit 15. After the noise transfer information is obtained, it may also be displayed to provide a reference or the parameters of the filter 17 may be modified directly from the noise transfer information. It is also possible to display the noise transfer information and to correct the parameters of the filter 17 at the same time. Referring to fig. 6, in other embodiments of the network node, the controller 13 is further electrically connected to the filter 17, and the controller 13 is further configured to correct parameters of the filter 17 according to the noise transfer information. The controller 13 is also communicatively connected (wired or wireless) to the display device 30 to cause the display device 30 to display the noise transfer information. The display device 30 may be disposed inside the network node 10 or outside the network node 10.
The embodiment of the invention not only can delay and send the noise transfer information to the display end for real-time monitoring, but also can transmit the obtained noise transfer information to the PTP slave network node in real time, thereby directly correcting the filter parameters of the measured object by the slave network node to form closed-loop control.
Embodiments of the present application provide a non-transitory computer readable storage medium storing computer executable instructions for execution by one or more processors, such as one of the processors 131 in fig. 4, to cause the one or more processors to perform the measurement method of any of the method embodiments described above, such as performing the method steps 101-103 in fig. 1, and the method steps 101-105 in fig. 3 described above.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus a general purpose hardware platform, but may also be implemented by means of hardware. Those skilled in the art will appreciate that all or part of the processes implementing the methods of the above embodiments may be implemented by a computer program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and where the program may include processes implementing the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random access Memory (RandomAccessMemory, RAM), or the like.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (9)
1. A method of time noise transfer characteristic measurement for a network node in communication with at least one other network node, the network node acting as a slave network node, the method comprising:
acquiring a reference clock signal, wherein the reference clock signal is obtained by locking a clock source signal;
acquiring messages sent by other network nodes, generating noise, overlapping the noise to an original time stamp of the messages, synchronizing clocks of the other network nodes according to the time stamp after overlapping the noise, and obtaining a recovered clock signal carrying the noise, wherein the other network nodes also lock the clock source signal;
obtaining a time difference value between the reference clock signal and the recovered clock signal carrying noise;
sampling to obtain a plurality of time difference values, and obtaining a phase difference curve according to the plurality of time difference values;
and obtaining the peak value of the phase difference curve, and obtaining the noise transfer information according to the peak value and the original noise.
2. The method of measuring according to claim 1, wherein said superimposing the noise to the original timestamp of the message comprises:
and superposing a value corresponding to the noise phase when the message is received to an original time stamp of the message.
3. The measurement method according to claim 1, wherein synchronizing clocks of the other network nodes according to the time stamp after the noise is superimposed to obtain a recovered clock signal carrying noise comprises:
synchronizing clocks of other network nodes according to the time stamp after the noise superposition, and filtering the obtained clock signals to obtain recovered clock signals carrying noise;
the method further comprises the steps of:
transmitting the noise transfer information to a display device to cause the display device to display the noise transfer information;
and/or the number of the groups of groups,
and correcting the filtered parameters according to the noise transfer information.
4. A network node, the network node comprising:
the communication transceiver is used for receiving the clock source signal and receiving and transmitting messages;
the first locking unit is electrically connected with the communication transceiver and is used for locking a clock source signal to obtain a reference clock signal;
a noise generator for generating noise;
the second locking unit is respectively and electrically connected with the communication receiving and transmitting device and the noise generator, and is used for acquiring messages sent by other network nodes received by the communication receiving and transmitting device, superposing noise generated by the noise generator on an original time stamp of the messages, synchronizing clocks of the other network nodes according to the time stamp superposed with the noise, and obtaining a recovered clock signal, wherein the other network nodes also lock the clock source signal;
the time comparison unit is respectively and electrically connected with the first locking unit and the second locking unit and is used for acquiring the time difference value of the reference clock signal and the recovered clock signal;
and the controller is electrically connected with the time comparison unit and is used for sampling each time difference value to obtain a time difference value curve, obtaining a peak value of the time difference value curve and comparing the peak value with original noise to obtain the noise transmission information.
5. The network node of claim 4, further comprising a filter electrically coupled between the second locking unit and the time comparison unit, the filter configured to filter noise in the recovered clock signal, the controller further electrically coupled to the filter, the controller further configured to modify a parameter of the filter based on the noise transfer information.
6. The network node of claim 4 or 5, wherein the controller is further communicatively coupled to a display device to cause the display device to display the noise transfer information.
7. The network node of claim 4, wherein the clock source signal is a GPS clock signal;
the first locking unit is a phase-locked loop circuit;
the time comparison unit is a comparator.
8. A network node, the network node comprising:
the communication transceiver is used for receiving the clock source signal and receiving and transmitting messages;
the first locking unit is electrically connected with the communication transceiver and is used for locking a clock source signal to obtain a reference clock signal;
the controller is respectively and electrically connected with the communication transceiver and the first locking unit;
the controller includes:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-3.
9. A non-transitory computer readable storage medium storing computer executable instructions which, when executed by a network node, cause the network node to perform the method of any of claims 1-3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810133981.5A CN110138487B (en) | 2018-02-09 | 2018-02-09 | Time noise transfer characteristic measurement method and network node |
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