CN113014345B - Clock synchronization early warning method, device and system thereof - Google Patents
Clock synchronization early warning method, device and system thereof Download PDFInfo
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- H—ELECTRICITY
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- H04J3/00—Time-division multiplex systems
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- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
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Abstract
The invention relates to a clock synchronization early warning method, equipment and a system thereof for process layer equipment. The method comprises the following steps: receiving a first clock signal input from the outside, generating a time-giving message according to the first clock signal, sending the time-giving message to the process layer equipment, determining the time of sending the time-giving message as a first time, receiving a test message generated by the process layer equipment according to the time-giving message, determining the time of receiving the test message as a second time, and generating an early warning signal when the time-setting error is larger than an error threshold value, wherein the time-setting error is the difference value between the first time and the second time. Therefore, the purpose of high-precision clock synchronization management of the process layer equipment is achieved, the clock synchronization state of the process layer equipment is effectively monitored, and abnormal operation of the transformer substation due to the clock synchronization problem is avoided.
Description
Technical Field
The present invention relates to the field of clock synchronization technologies in power systems, and in particular, to a clock synchronization early warning method, apparatus, and system thereof.
Background
With the increasing maturity of transformer station technology, intelligent transformer stations are increasingly applied. The merging unit, the intelligent terminal and other process layer equipment convert analog signals such as voltage and current, a switch knife switch and the like into digital quantity signals and release the digital quantity signals to the network, so that data sharing and sharing are realized. However, in recent years, the abnormal operation of the transformer substation is caused by the false synchronization of the data released by the process layer equipment due to the abnormal operation of the time service system, so that the clock synchronization management system of the secondary system, particularly the process layer equipment, is very necessary for improving the stable operation of the transformer substation system.
The existing synchronous management method is a network-based time division multiplexing method, and for station control layer equipment, the clock synchronous precision of the time division multiplexing method can only reach 1ms, so that the requirement of process layer equipment on the clock synchronous precision still cannot be met.
Disclosure of Invention
Based on the above, it is necessary to provide a clock synchronization early warning method, a clock synchronization early warning device and a clock synchronization early warning system, which can monitor clock information of process layer devices in real time and give high-precision synchronization early warning.
The clock synchronization early warning method is applied to clock synchronization management equipment, the clock synchronization management equipment is connected with process layer equipment, and the early warning method comprises the following steps:
receiving a first clock signal input from the outside;
generating a time service message according to a first clock signal, sending the time service message to process layer equipment, and determining the time for sending the time service message as a first time;
receiving a test message generated by process layer equipment according to the time service message, and determining the moment of receiving the test message as a second moment;
when the time setting error is larger than the error threshold value, generating an early warning signal, wherein the time setting error is the difference value between the first moment and the second moment;
in one embodiment, the corresponding early warning signal is generated according to the absolute value of the time synchronization error and a preset early warning rule.
In one embodiment, the first level warning signal is generated when the absolute value of the time synchronization error is greater than 1 ms.
In one embodiment, the second level warning signal is generated when the absolute value of the time synchronization error is greater than 1 μs and less than or equal to 1 ms.
In one embodiment, the first clock signal input from the outside is received, and the first clock signal is sent by the global positioning system time service device and/or the Beidou satellite navigation system time service device.
In one embodiment, the time grant message is sent by any one of IRIG-B, IEEE1588 and PPS.
In one embodiment, a rising edge time or a falling edge time of the second pulse of the received test message is obtained, and the rising edge time or the falling edge time is used as the second time.
A clock synchronization early warning device, comprising:
the clock signal receiving module is used for receiving a first clock signal input from the outside;
the time service message issuing module is used for generating a time service message according to the first clock signal, sending the time service message to process layer equipment and determining the moment of sending the time service message as a first moment;
the test message receiving module is used for receiving a test message generated by the process layer equipment according to the time service message and determining the moment of receiving the test message as a second moment;
and the calculation alarm module is used for generating an early warning signal when the time setting error is larger than an error threshold value, wherein the time setting error is the difference value between the first moment and the second moment.
In one embodiment, the calculation alarm module is further configured to give confidence levels of abnormality of the clock synchronization early warning device and the process layer device according to different abnormality conditions.
A clock synchronization early warning system, comprising:
process layer equipment;
the clock synchronization early warning device and the process layer device are connected in a point-to-point mode or in a network-to-network mode.
The clock synchronization early warning method, the device and the system thereof are applied to clock synchronization management equipment, the clock synchronization management equipment is connected with process layer equipment, and the early warning method comprises the following steps: receiving a first clock signal input from the outside; generating a time service message according to a first clock signal, sending the time service message to process layer equipment, and determining the time for sending the time service message as a first time; receiving a test message generated by process layer equipment according to the time service message, and determining the moment of receiving the test message as a second moment; when the time setting error is larger than the error threshold value, generating an early warning signal, wherein the time setting error is the difference value between the first moment and the second moment; the method forms the closed loop transmission of the clock information, and can preset an error threshold corresponding to the required precision according to different clock information precision required by process layer equipment, thereby achieving the purpose of high-precision clock monitoring. The difference between the recorded first time T1 and the second time T2 is calculated, and the absolute value of the time setting error is compared with the error threshold value so as to simply and concisely compare the two time setting errors, thereby rapidly generating an early warning signal and achieving the purpose of improving the clock synchronization precision.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a flowchart illustrating a synchronous clock synchronization early warning method according to an embodiment;
fig. 2 is a block diagram of a clock synchronization warning apparatus according to an embodiment.
Reference numerals illustrate:
a clock signal receiving module: 210; time-giving message issuing module: 220; test message receiving module: 230, a step of; and (3) calculating an alarm module: 240.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments should be understood as "electrical connection", "communication connection", and the like if there is transmission of electrical signals or data between objects to be connected.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
As described in the background art, with the increasing maturity of the transformer station technology, intelligent transformer stations are increasingly applied due to the advantages of low construction cost, convenient operation and maintenance and the like. Clock synchronization management of process layer equipment is necessary for improving stable operation of a transformer substation system. In the prior art, a clock synchronization management method is implemented and is a network-based time division multiplexing method. However, the real-time performance and precision of the clock synchronization management method can only meet the requirement of the station control layer equipment on the clock synchronization precision of 1ms, but cannot meet the requirement of the process layer equipment on the higher clock synchronization precision.
Based on the reasons, the invention provides a clock synchronization early warning method.
In one embodiment, as shown in fig. 1, a clock synchronization pre-warning method is provided, which is applied to a clock synchronization pre-warning device, where the clock synchronization pre-warning device is connected to a process layer device, and the method includes steps S110 to S140.
Step S110, a first clock signal input from the outside is received.
Optionally, the externally input first clock signal received here may be a first clock signal issued by each clock in the communication channel synchronization system through which the power grid center schedules, or may be a first clock signal issued by using a radio time announcement of a broadcasting station, a television station, or an astronomical station, or may be a first clock signal sent by a global positioning system time service device and/or a Beidou satellite navigation system time service device, or may be a first clock signal sent by other accurate time service devices. For example, a first clock signal issued by a satellite signal of a global positioning system can acquire a time pulse with an accuracy of 1 μs or less, and can be reliably received anywhere in the world, and is a good externally input first clock signal. For another example, as the deployment of the Beidou satellites in China is completed, the space section of the Beidou system adopts a mixed constellation composed of three kinds of orbit satellites, compared with other satellite navigation systems, the space section of the Beidou system is more than that of the high orbit satellites, the shielding resistance is strong, and particularly, the performance advantage of low latitude areas is more obvious. The navigation signal of a plurality of frequency points is provided, and the service accuracy can be improved by using the multi-frequency signals in combination. The novel navigation system integrates navigation and communication capabilities, has various service capabilities such as positioning navigation time service, satellite-based reinforcement, foundation reinforcement, precise single-point positioning, short message communication, international search and rescue and the like, and can be preferably used as a high-precision first clock signal.
Step S120, generating a time service message according to the first clock signal, sending the time service message to the process layer equipment, and determining the time for sending the time service message as the first time. The message is a data unit exchanged and transmitted in the network, namely a data block to be sent by the station at one time. The message contains complete data information to be sent, and the time service message is data information containing clock information, alternatively, the time service message can be any message containing clock information.
Step S130, receiving a test message generated by the process layer equipment according to the time service message, and determining the moment of receiving the test message as a second moment.
And receiving a test message generated by the process layer equipment according to the time-giving message, and determining the time of receiving the test message as a second time, wherein the rising edge time or the falling edge time of the second pulse of the received test message is obtained, and the rising edge time or the falling edge time is taken as the second time. Alternatively, the time service message may be any message containing clock information.
Optionally, IRIG-B (InterRange Instrumentation Group) is sent out as an output time service message time code sequence, and IRIG (InterRange Instrumentation Group) time code sequence is a time information transmission system proposed by a target range instrument group (IRIG) under the national defense department and commonly used. The time code sequence component G, A, B, E, H, D has six coding formats, namely IRIG-B (InterRange Instrumentation Group) format, which is abbreviated as B code, and has the outstanding advantages that time synchronization signals and time code information such as seconds, minutes, hours, days and the like are loaded into a signal carrier with the frequency of 1 kHz. The signal carrier commonly used in the current transformer substation is twisted pair with physical signal of RS-422 level. The global positioning system receives satellite time signals, outputs IRIG-B (InterRange Instrumentation Group) time code sequences, and the intelligent substation equipment can be hung on a unified time synchronization bus to perform time synchronization.
Optionally, the timing message is sent in IEEE1588 protocol, the full name of IEEE1588 is "precision clock synchronization protocol standard of network measurement and control system", the basic function is to keep all clocks in the distributed network synchronized with the most accurate clock, which defines a precision time protocol PTP (Precision Time Protocol) for sub microsecond synchronization of clocks in sensors, actuators and other terminal devices in standard ethernet or other distributed bus systems employing multicast technology. IEEE1588 (precision clock synchronization protocol standard for network measurement and control systems) may be implemented in pure software or in specialized hardware that can provide more accurate time synchronization. The accuracy and uncertainty of time is largely dependent on the implementation of the module and IEEE1588 (precision clock synchronization protocol standard for network measurement and control systems), and is generally expected to be in the tens of nanoseconds to tens of sub-microseconds. IEEE1588 (precision clock synchronization protocol standard for network measurement and control systems) is used for local area distribution systems requiring higher time accuracy than NTP (Network Time Protocol), and also for applications where the gps is not acceptable for high cost or for reception of gps signals.
Optionally, PPS, i.e. how many packet data packet formats are sent per second, may also be sent as a transmission of time grant messages.
And step S140, when the time setting error is larger than the error threshold value, generating an early warning signal, wherein the time setting error is the difference value between the first moment and the second moment.
Optionally, the error threshold is preset according to the precision requirement, a single threshold can be set, a plurality of thresholds can be set, and the error threshold can also be set in different ranges, namely a range from a first threshold to a third threshold, a range from a second threshold to a third threshold, and a range from the second threshold to the third threshold.
Optionally, a preset early warning rule may be set for generating an early warning signal, and the early warning may be one early warning or multiple early warnings; optionally, the early warning level may be set, where the first level is higher than the second level, the second level is higher than the third level, and the third level is higher than the fourth level, and the first level is higher than the second level, the second level is level with the third level, and the second level is higher than the third level. Optionally, the issuing of the early warning signal may be set according to the issuing range, and may be a small range or a large range.
Alternatively, when comparing the timing error with the error threshold, the absolute value of the timing error may be compared with the error threshold, or the error threshold may be determined according to the sign of the timing error and then compared. Preferably, to avoid the problem of sign comparison, the absolute value of the time-lapse error is compared to an error threshold.
In this embodiment, by using the clock synchronization early warning method, during the clock synchronization management process of the management process layer device, the clock synchronization abnormal condition of the process layer device can be timely and effectively monitored and detected, and different early warning information can be issued according to different time precision requirements of the management device. By receiving the external first clock information, higher-precision clock information can be selected, or the external clock information can be selectively used as the first clock information according to the equipment condition. The selectivity of the clock information is increased. Generating a time-giving message according to the first clock signal, sending the time-giving message to the process layer equipment, and determining the moment of sending the time-giving message as a first moment; the receiving process layer equipment receives the test message generated by the time-giving message, determines the time of receiving the test message as the second time, forms closed loop transmission of clock information, can accurately detect the condition of equipment time-setting through checking the time-setting closed loop, and solves the problem caused by clock synchronization of the intelligent substation. And meanwhile, when the calculated time setting error is larger than a preset error threshold, an early warning signal is generated. The setting of the error threshold value determines the clock precision condition required by the equipment, and according to the early warning signal, the error size existing in the clock synchronization process of the equipment can be rapidly analyzed, and effective measures can be immediately taken according to the error size.
The time synchronization management of the process layer equipment can be effectively monitored and managed through the clock synchronization early warning method, particularly the clock synchronization management of the merging unit type equipment is provided, the intelligent monitoring method is provided, the clock synchronization management level is improved, abnormal operation of the transformer substation caused by asynchronous clocks is avoided, guarantees are provided for the aspects of daily life, production electricity consumption and the like of the user, and meanwhile, the high-precision time monitoring of the process layer equipment of the transformer substation is increased, so that even if problems are found, the maintenance cost of the large problems is reduced as much as possible.
In one embodiment, the first clock signal input from the outside is received, and the first clock signal is sent by the global positioning system time service device and/or the Beidou satellite navigation system time service device. By using the global positioning system time service equipment and the Beidou satellite navigation system time service equipment, high-precision time pulses can be obtained, high-precision time setting errors can be provided, then high-precision error thresholds can be preset, and high-precision clock early warning signals can be provided.
In one embodiment, the timing message may be sent by any of IRIG-B (InterRange Instrumentation Group), IEEE1588 (precision clock synchronization protocol standard for network measurement and control systems), and PPS. IRIG-B (InterRange Instrumentation Group) is a time code commonly used by a current transformer substation, intelligent equipment of the transformer substation adopts IRIG-B (InterRange Instrumentation Group) code time synchronization, communication message time synchronization based on a field bus is not needed, and a global positioning system is not needed to output a large number of pulse time synchronization signals. IEEE1588 (precision clock synchronization protocol standard for network measurement and control systems) can achieve sub-millisecond sub-microsecond time synchronization accuracy. PPS is the most commonly used transmission scheme.
In one embodiment, the corresponding early warning signal is generated according to the absolute value of the time synchronization error and a preset early warning rule. It can be understood that the sign exists in the calculation of the time setting error, and when the time setting error obtained by the calculation is a negative value, the time setting error of the negative value is necessarily smaller than the threshold value of the positive value, so that the time setting error cannot be correctly compared with the threshold value, and the problem of judgment error and early warning error is caused. Furthermore, because different devices have the problem of different time precision requirements, different early warning rules are set according to the different devices, and different early warning signals are correspondingly generated, so that the method can be suitable for the requirements of time synchronization management of the different devices. In one embodiment, the first level warning signal is generated when the absolute value of the time synchronization error is greater than 1 ms. The generated early warning signal can meet the requirement of the station control layer on time synchronous management, and can be overhauled in time.
In one embodiment, the second level warning signal is generated when the absolute value of the time synchronization error is greater than 1 μs and less than or equal to 1 ms. The generated early warning signal can meet the requirement of process layer equipment on time synchronization management. Alternatively, when the absolute value of the time synchronization error is greater than 1ms, the severity level of the early warning signal generated by the first level may be higher than that of the early warning signal generated by the second level, so that the severity level of the time synchronization error generated by the process layer equipment can be monitored simultaneously.
Alternatively, in order to realize high-precision clock synchronization alarm, the first-level early-warning signal with the absolute value of the time synchronization error being greater than 1ms may be generated, and the second-level early-warning signal may be generated when the severity level is greater than the absolute value of the time synchronization error by more than 1 μs and less than or equal to 1ms, and the release range of the first-level early-warning signal may be set to be greater than the release range of the second-level early-warning signal. The maintainer can judge the magnitude of the time setting error according to the high-low level of the early warning signal, and can determine the equipment affected by the clock synchronization abnormality according to the release range of the early warning signal, and can more quickly and accurately determine the equipment with the clock synchronization abnormality, and more timely overhaul and monitor.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a portion of the steps of FIG. 1 may include multiple steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the steps or stages in other steps.
In one embodiment, as shown in fig. 2, a clock synchronization early warning device is provided, and the module is formed by an application specific integrated circuit module, and includes a clock signal receiving module 210, a time service message issuing module 220, a test message receiving module 230 and a calculation alarm module 240.
Specifically, the clock signal receiving module is used for receiving a first clock signal input from the outside; the time-giving message issuing module is used for generating a time-giving message according to the first clock signal, sending the time-giving message to the process layer equipment, and determining the moment of sending the time-giving message as a first moment; the test message receiving module is used for receiving a test message generated by the process layer equipment according to the time-giving message and determining the moment of receiving the test message as a second moment; and the calculation alarm module is used for generating an early warning signal when the time setting error is larger than the error threshold value, wherein the time setting error is the difference value between the first moment and the second moment.
In one embodiment, the calculation alarm module is further configured to give confidence levels of abnormality of the clock synchronization early warning device and the process layer device according to different abnormality conditions. Giving the abnormal confidence coefficient of the clock synchronization management device and the process layer equipment confidence coefficient, wherein the abnormal time setting precision can be caused by the abnormal operation of the process layer equipment, or can be caused by the abnormal operation of the clock synchronization management device, and giving the abnormal confidence coefficient of the two equipment according to different abnormal conditions, so that the operation and maintenance personnel can find out and solve the problem conveniently. By acquiring the confidence coefficient, the time service and the test loop with high precision are improved, the clock synchronization management precision is ensured, the clock synchronization management of process layer equipment, particularly merging unit equipment is realized, and the intelligent monitoring level is improved.
The clock synchronization management device of the process layer device firstly obtains clock information, and simultaneously compatibly receives the clock information issued by the global positioning system and the clock information issued by the Beidou satellite, and an atomic clock (a double-layer clock or a rubidium clock) is carried on the global positioning satellite or the Beidou satellite, so that the clock synchronization management device has an accurate clock, and the time of the satellite system can be very accurate due to the continuous correction of the ground station. Therefore, we take this as the reference clock source information. And then transmitting time-giving messages to the process layer equipment through point-to-point direct connection or time-setting network in a switch networking mode, so that the process layer equipment receives the time-giving messages and transmits test messages. The two messages comprise test messages sent in the modes of IRIG-B (Inter Range Instrumentation Group), IEEE1588 (precision clock synchronization protocol standard of a network measurement and control system), PPS and the like. The process layer equipment clock synchronization management system receives the test message, records and transmits the test clock information. When the clock information and the test clock information are recorded and transmitted to the same module, the system calculates the time setting error between the first moment and the second moment, judges whether the error exceeds the standard according to the time setting error, alarms when the error is larger than the set standard, prompts maintenance personnel to check and repair, and continues to detect when the error is within the standard range.
The specific limitation of the clock synchronization early warning device may be referred to the limitation of the method of the clock synchronization early warning device hereinabove, and will not be described herein. All or part of the modules in the clock synchronization early warning device can be realized by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.
The embodiment of the application also provides a clock synchronization early warning system which comprises the process layer equipment and the clock synchronization early warning equipment, wherein the clock synchronization early warning equipment and the process layer equipment are connected in a point-to-point mode or a switch network. And the time service message issuing module of the clock synchronization early warning device sends the time service message to a single process layer device or a plurality of process layer devices through the network connection.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (6)
1. The clock synchronization early warning method is characterized by being applied to clock synchronization early warning equipment, wherein the clock synchronization early warning equipment is connected with process layer equipment, and the early warning method comprises the following steps:
receiving a first clock signal sent by global positioning system time service equipment and/or Beidou satellite navigation system time service equipment;
generating a time service message according to the first clock signal, sending the time service message to process layer equipment, and determining the time for sending the time service message as a first time;
receiving a test message generated by process layer equipment according to the time service message, and determining the moment of receiving the test message as a second moment;
when the absolute value of the time synchronization error is greater than 1ms, generating a first-level early warning signal; and/or
Generating a second-level early warning signal when the absolute value of the time setting error is larger than 1 mu s and smaller than or equal to 1 ms;
the time setting error is a difference value between the first time and the second time.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the time service message is sent by any mode of IRIG-B, IEEE1588 and PPS.
3. The method of claim 1, wherein the receiving the test message to generate the second time comprises:
and acquiring the rising edge time or the falling edge time of the second pulse of the received test message, and taking the rising edge time or the falling edge time as the second time.
4. A clock synchronization early warning apparatus, comprising:
the clock signal receiving module is used for receiving a first clock signal sent by the global positioning system time service equipment and/or the Beidou satellite navigation system time service equipment;
the time service message issuing module is used for generating a time service message according to the first clock signal, sending the time service message to process layer equipment and determining the moment of sending the time service message as a first moment;
the test message receiving module is used for receiving a test message generated by the process layer equipment according to the time service message and determining the moment of receiving the test message as a second moment;
the calculation alarm module is used for generating a first-level early warning signal when the absolute value of the time synchronization error is greater than 1 ms; and/or generating a second level early warning signal when the absolute value of the time setting error is greater than 1 μs and less than or equal to 1 ms; the time setting error is a difference value between the first time and the second time.
5. The clock synchronization warning apparatus of claim 4, wherein the computational alarm module is further configured to give confidence levels of anomalies in the clock synchronization warning apparatus and in the process layer apparatus based on different anomalies.
6. A clock synchronization early warning system, comprising:
process layer equipment;
the clock synchronization warning apparatus of claim 4 or 5, which is a point-to-point connection or a switch network connection with the process layer apparatus.
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