CN113162718A - Time determination method, system and medium based on multiple time service signals - Google Patents
Time determination method, system and medium based on multiple time service signals Download PDFInfo
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- 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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Abstract
The invention provides a time determination method, a time determination system and a time determination medium based on various time service signals. The time determination method comprises the following steps: step S1, each time server receives a wireless time service signal, and completes respective autonomous integrity monitoring based on the wireless time service signal to determine the validity of the wireless time service signal; step S2, acquiring time information of a plurality of time sources and corresponding 1PPS from the wireless time service signal and the wired time service signal received from the wired time service link, wherein the time sources comprise a time source from the wireless time service signal and a time source from the wired time service signal; and step S3, finishing the time service integrity monitoring of each time server based on the time information of the plurality of time sources and the corresponding 1PPS, and using the time service integrity monitoring as the time service integrity information of the current node.
Description
Technical Field
The invention relates to the field of signal processing, in particular to a time determination method, a time determination system and a time determination medium based on various time service signals.
Background
A time determination system (also referred to as a "time unification system") is a complete set of systems consisting of various electronic devices that provide standard time signals and standard frequency signals to achieve unification of time and frequency of the entire system. The time determination system consists of a time service part and a user part. User terminal equipment is generally referred to as time-aligned terminal equipment, or simply "time-aligned" terminal equipment.
The time reference established and maintained by the time keeping system transmits the time information representing the time reference to the user through the time service system. The time system terminal equipment is used for receiving the time service signal and keeping the self time and the time reference synchronous. And part of the time service can be provided for other equipment by the time service terminal equipment on the basis of the time service terminal equipment.
Fig. 1 is a schematic diagram of a hierarchical control flow according to a comparative example of the present invention, where as shown in fig. 1, an upper node provides time service to a lower node, the lower node and the upper node maintain time synchronization, and a schematic diagram of a basic topological relationship is shown in fig. 1. The primary node and the time reference keep time synchronization, the secondary node and the primary node keep time synchronization, and the tertiary node and the secondary node keep time synchronization. In actual need, four-level nodes, five-level nodes and even more levels of nodes can be arranged. Finally, a time determination system with a tree structure is established, and the synchronization of the time and the time reference of the whole system is realized.
The time synchronization between the upper and lower nodes can be realized through fiber bidirectional time frequency transmission, PTP (through SDH E1 link), network PTP, network NTP and other ground wired links, and finally the time and time reference synchronization of the whole system is realized. The time terminal devices of some nodes can also directly receive wireless time signals (satellite time service, long wave time service, short wave time service and the like) to directly realize synchronization with the time reference. If a certain node receives multiple time service signals such as wireless time service and ground wired link time service at the same time, various time service means such as wireless time service and ground wired link time service can be mutually backed up, and the integrity and the correctness of time information are mutually checked.
Time synchronization between nodes is generally achieved by a Time Server (TS) deployed at upper and lower nodes. The TS is a core device of each time synchronization node. The time service system has the functions of receiving a time service signal provided by a superior node, realizing time synchronization with the superior node and providing time service for the current node and a subordinate node.
In general, except for the last node, other nodes must be equipped with a TS because the node needs to provide time service for the present and lower nodes. The final node may be equipped with a TS to provide time service for other time system terminal devices of the present stage, or may be equipped with only some other time system terminal devices without a TS, and these time system terminal devices directly perform time synchronization with the TS of the upper node.
The time determination system has mature application cases in the fields of power, finance and the like. In these fields, the TS of each node generally receives wireless time signals such as beidou/GPS time service, and the number of time service signals is small, so that time service integrity detection cannot be performed by using multiple time service signals, and the reliability of time information is not high enough.
Disclosure of Invention
The invention aims to provide a time determination scheme based on various time service signals so as to solve the technical problems in the prior art.
The invention provides a time determination method based on various time service signals, and the time synchronization method adopts a hierarchical control mode to synchronize the time. The hierarchical control includes: k-level nodes, wherein K is a positive integer; when i takes 1, a time server in each node in the ith level node is synchronous with a time reference; and when i is a positive integer from 2 to K, a time server in each node in the ith level node is synchronous with a time server of a corresponding node in the i-1 level node, and the time server in each node in the ith level node is connected with the time server of the corresponding node in the i-1 level node through a wired time service link. The time determination method comprises the following steps: step S1, each time server receives a wireless time service signal, and completes respective autonomous integrity monitoring based on the wireless time service signal to determine the validity of the wireless time service signal; step S2, acquiring time information of a plurality of time sources and corresponding 1PPS from the wireless time service signal and the wired time service signal received from the wired time service link, wherein the time sources comprise a time source from the wireless time service signal and a time source from the wired time service signal; and step S3, finishing the time service integrity monitoring of each time server based on the time information of the plurality of time sources and the corresponding 1PPS, and using the time service integrity monitoring as the time service integrity information of the current node.
Specifically, the step S3 specifically includes: step S31, determining that the time information of each of the plurality of time sources is the same; and step S32, determining that the deviation between 1PPS of each of the plurality of time sources is within a threshold range.
Specifically, the hierarchical control further comprises at least one monitoring server, and the monitoring server is used for monitoring service data and working condition data.
Specifically, the wireless time service signal is accessed to the hierarchical control network and directly synchronized with the time reference.
According to a second aspect of the invention, a time determination system based on multiple time service signals is provided, and the time synchronization method adopts a hierarchical control mode to synchronize the time. The hierarchical control includes: k-level nodes, wherein K is a positive integer; when i takes 1, a time server in each node in the ith level node is synchronous with a time reference; and when i is a positive integer from 2 to K, a time server in each node in the ith level node is synchronous with a time server of a corresponding node in the i-1 level node, and the time server in each node in the ith level node is connected with the time server of the corresponding node in the i-1 level node through a wired time service link. The time determination system includes: the autonomous integrity monitoring module is configured to receive a wireless time service signal by each time server and complete respective autonomous integrity monitoring respectively based on the wireless time service signal so as to determine the validity of the wireless time service signal; the time source acquisition module is configured to acquire time information of a plurality of time sources and corresponding 1PPS from the wireless time service signal and the wired time service signal received from the wired time service link, wherein the plurality of time sources comprise a time source from the wireless time service signal and a time source from the wired time service signal; and the time service integrity monitoring module is configured to complete time service integrity monitoring of each time server based on the time information of the plurality of time sources and the corresponding 1PPS, and the time service integrity monitoring is used as time service integrity information of the current node.
Specifically, the timing integrity monitoring module is specifically configured to: determining that the time information of each of the plurality of time sources is the same; and determining that a deviation between 1PPS for each of the plurality of time sources is within a threshold range.
Specifically, the hierarchical control further comprises at least one monitoring server, and the monitoring server is used for monitoring service data and working condition data.
Specifically, the wireless time service signal is accessed to the hierarchical control network and directly synchronized with the time reference.
A third aspect of the invention provides a non-transitory computer readable medium having stored thereon instructions which, when executed by a processor, perform the steps of the method for time determination based on a plurality of timing signals according to the first aspect of the invention.
In conclusion, the technical scheme of the invention has the advantages that the multi-channel time service signal is adopted, the time service integrity detection and high-precision measurement are realized, and the accurate time information can be provided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a hierarchical control flow according to a comparative example of the present invention;
FIG. 2 is a flow chart of a method for determining time based on various timing signals according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a hierarchical control flow according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of communication connections among nodes in various levels according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of time solution and time difference measurement according to an embodiment of the invention;
FIG. 6 is a schematic diagram of communication connections among nodes at various levels according to an improved embodiment of the present invention;
fig. 7 is a schematic diagram of communication connections of nodes at various levels according to another improved embodiment of the present invention; and
FIG. 8 is a block diagram of a time determination system based on various timing signals in accordance with an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a time determination method based on various time service signals, which adopts a hierarchical control mode to synchronize the time, wherein: the hierarchical control includes: k-level nodes, wherein K is a positive integer; when i takes 1, a time server in each node in the ith level node is synchronous with a time reference; and when i is a positive integer from 2 to K, a time server in each node in the ith level node is synchronous with a time server of a corresponding node in the i-1 level node, and the time server in each node in the ith level node is connected with the time server of the corresponding node in the i-1 level node through a wired time service link.
The time determination method comprises the following steps: step S1, each time server receives a wireless time service signal, and completes respective autonomous integrity monitoring based on the wireless time service signal to determine the validity of the wireless time service signal; step S2, acquiring time information of a plurality of time sources and corresponding 1PPS from the wireless time service signal and the wired time service signal received from the wired time service link, wherein the time sources comprise a time source from the wireless time service signal and a time source from the wired time service signal; and step S3, finishing the time service integrity monitoring of each time server based on the time information of the plurality of time sources and the corresponding 1PPS, and using the time service integrity monitoring as the time service integrity information of the current node.
Fig. 2 is a schematic diagram of a hierarchical control flow according to an embodiment of the present invention. As shown in fig. 2, in a hierarchical control manner, when i takes 1, the time server in each node in the ith level node is synchronized with the time reference; and when i takes a positive integer from 2 to K, the time server in each node in the ith level node is synchronous with the time server of the corresponding node in the (i-1) th level node. Fig. 2 shows a connection relationship diagram of (at least) 2 TSs (time servers) of each level of nodes. TS of each level of nodes is connected by adopting optical fiber time frequency transmission, E1 link (PTP), network NTP and other ground wired time service links, and a time determination system for hierarchical control is constructed by adopting a ground wired link time service mode. In fig. 2, TS1 and TS1 of each node are synchronized, and TS2 and TS2 are synchronized.
Fig. 3 is a schematic diagram of communication connections of nodes at different levels according to an embodiment of the present invention. As shown in fig. 3, each node is configured with at least 2 TSs, each TS receives a wired link time service signal provided by a TS corresponding to a higher node through a ground wired link, and synchronization of the TS corresponding to the higher node is achieved; meanwhile, a wireless time service signal is received, and the synchronization with the standard time is realized; and 2, the TS simultaneously provides time synchronization service for the terminal in the node and the TS corresponding to the lower node. Each TS has high-precision measurement capability of tens of ps magnitude, and the time difference of 1PPS provided by each resolving module can be measured, so that support is provided for time service integrity detection. Each TS has 2 integrity detection methods. The 1 is autonomous integrity detection for wireless time service signals. And 1, comprehensively judging the integrity of the time service signal by using time information obtained by resolving through a multi-path resolving module and 1PPS time difference.
In some embodiments, at least 1 monitoring server is configured to run monitoring software and store all service and condition data. All the devices are connected to the internal network and receive the monitoring of the monitoring software.
FIG. 4 is a schematic diagram of TS time resolution and time difference measurement according to an embodiment of the invention; as shown in fig. 4, the DPLL is a digital phase locked loop, gn (z) is the transfer function of the DPLL when the time source N is used. There are 7 time sources in the figure. In practice, the number of time sources may also be increased or decreased. A time resolving module is arranged in the TS and is used for resolving time information (year, month, day, time, minute and second) and 1PPS (picture per second) of each time source (optical fiber time frequency transmission, SDH E1 link (PTP), network NTP, Beidou, GPS, long wave, IRIG-B (DC) of the other 1 TS and the like). When a bidirectional wired link is adopted, such as optical fiber time frequency transmission, SDH E1 link (PTP), network NTP, etc., the module can also simultaneously calculate the time synchronization deviation between the TS of the current node and the TS corresponding to the upper node.
In some embodiments, a rubidium clock set in each of the timeservers is utilized to synchronize time on the nodes of the N levels. The user can set the priority of the time source (fiber time frequency transfer, SDH E1 link (PTP), network NTP, beidou, GPS, long wave, IRIG-b (dc) of another 1 TS, etc.). And the TS adopts a DPLL mode to realize the time synchronization of the internal rubidium clock and the time source with the highest priority. That is, the internal rubidium clock is adjusted by the DPLL, and synchronization of 1PPS of the DPLL output and 1PPS of the time source is ensured. The transfer function of the DPLL is different for different time sources. When the 1PPS output by the resolving module N is selected, the transfer function is represented by GN (z), namely when different time sources are selected, the transfer function needs to be optimized and designed respectively.
And a multi-channel and high-precision time difference measuring module of the TS measures and obtains the time difference between 1PPS (pulse per second) of the TS and 1PPS of the TS, which is obtained by resolving 7 time sources. The time difference measurement accuracy is in the order of tens of ps. The internal memory of the main TS may store the time difference for a period of time. In fig. 4, the time source with the highest priority is the time signal transmitted by the fiber time frequency, and therefore, the 1PPS output by the DPLL (i.e., "this second" of TS) is finally kept time-synchronized with the 1PPS calculated by the time calculation module of the fiber time frequency transmission.
The time service integrity detection comprises 3 aspects: firstly, autonomous integrity detection of each TS wireless time service signal and autonomous integrity detection of a ground bidirectional time service link; secondly, each TS judges the time service integrity by utilizing time information obtained by resolving various time service signals and 1 PPS; and thirdly, detecting the time service integrity of each node.
And for the first, autonomous integrity detection of each TS wireless time service signal and autonomous integrity detection of a ground bidirectional time service link.
For wireless time service signals such as Beidou and GPS, the resolving module can perform autonomous integrity detection. However, any autonomous integrity detection algorithm has a certain detection probability and false alarm probability. Through the autonomous integrity, the correctness of Beidou and GPS time service signals can be basically judged with a higher probability.
For the ground bidirectional wired time service links such as optical fiber time frequency transmission, SDH E1 links (PTP), network NTP and the like, the resolving module can resolve time synchronization deviation between upper and lower nodes, and can judge whether the upper and lower nodes are synchronous or not by comparing the time synchronization deviation with theoretical synchronization uncertainty. For example, the theoretical synchronization uncertainties of fiber time frequency transmission, SDH E1 link (PTP), and network NTP are 2ns (within several hundred kilometers), 5us, and 100ms, respectively, and if SDH E1 link (PTP) is used to perform time synchronization of upper and lower nodes, and the synchronization uncertainty calculated by the calculation module is 1us, it can basically be determined that the upper and lower nodes are time synchronized.
For the second TS and each TS, judging time service integrity by utilizing time information obtained by resolving a plurality of time service signals and 1 PPS;
in the last link, namely the autonomous integrity detection of each TS wireless time service signal and the autonomous integrity detection of the ground bidirectional wired time service link, the integrity abnormality does not occur, and the time information acquired by the time service modes and the 1PPS are considered to be correct basically with greater assurance. In addition, each TS needs to further determine the integrity of time service of the TS by using time information obtained by resolving a plurality of kinds of time service signals and 1 PPS.
And a multi-channel and high-precision time difference measuring module of the TS measures and obtains the time difference between 1PPS (demodulation second) provided by the 7 time source resolving modules and 1PPS (the second) of the TS. The time difference measurement accuracy is in the order of tens of ps. The internal memory of the TS may store the time difference over a period of time. The high-precision time difference measurement provides technical support for time service integrity detection.
The basic principle is as follows: and the TS acquires time information obtained by resolving the 7 paths of time service signals. If the 7 paths of time information are consistent, the time information is considered to be correct. And TS acquires the internal comparison result of 7-path 1 PPS. If the 7-way 1PPS deviation is within the theoretical range, the 1PPS solution is considered to be correct. In conclusion, when the time information and the 1PPS calculation result are judged to be normal, the time service signal is considered to be intact. If the TS judges that the integrity of a certain path of time service signal is abnormal, sound and light alarm is given, and operation prompt (switching time source and the like) is given.
And detecting the time service integrity of the third and each node.
Each node needs to comprehensively judge the time service integrity of the node by combining the autonomous integrity detection of at least 2 TS wireless time service signals, the autonomous integrity detection of a ground bidirectional wired time service link, time information obtained by resolving various time service signals and a 1PPS time service integrity detection result. If the time service integrity of the 3 methods of each TS has no problem, the time information of the node and 1PPS are basically considered to be credible.
Each node can be improved and improved correspondingly according to actual requirements.
Modified embodiment 1
In some cases, 1 upper node needs to provide time service to a plurality of lower nodes. However, too many fiber bidirectional time-frequency transfer solution modules and E1 link time solution modules cannot be integrated within the main TS. At this time, 1 fiber bidirectional time-frequency transfer solver and 1E 1 link time solver may be designed. In the 2 devices, N optical fiber bidirectional time-frequency transmission calculation modules and N E1 time calculation modules are integrated according to requirements, and are used for providing E1 time service for N subordinate nodes.
In this case, the improved design scheme of each node is shown in fig. 5, and 2 optical fiber bidirectional time-frequency transmission solvers and 2E 1 link time solvers are required to be added. Wherein, 1 optical fiber bidirectional time frequency transmission resolving device and 1E 1 link time resolving device respectively correspond to 1 TS through IRIG-B (DC) code, keep time synchronization with the TS, and then respectively provide time service to TS corresponding to the lower node through optical fiber and E1 link.
Modified embodiment 2
Considering that some nodes have high requirements on time-autonomous maintenance capability, a rubidium clock with a built-in TS may not meet the capability requirement of time-autonomous maintenance. According to practical requirements, the nodes can be additionally provided with 2 cesium clocks and 1 time difference measuring device. And 1 way of 1PPS is led out from each TS to be connected to time difference measuring equipment, and 1 way of 1PPS is led out from each cesium clock to be connected to the time difference measuring equipment. The time difference measuring equipment measures the time difference between each TS and each cesium clock in real time.
In this case, the improved design of each node is shown in fig. 6. When the node is in a time self-maintaining state, the time difference of the TS is adjusted in real time according to the time difference of the TS and the cesium clock recorded by the time difference measuring equipment, and the time difference variation of the TS relative to the cesium clock is deducted, so that the time self-maintaining capacity of the node is improved.
Modified example three
According to actual requirements, each node can be added with some devices and functions on the basis of the basic design scheme shown in fig. 3. For example, each node may also be configured with a time display screen or wall clock, etc.
The second aspect of the present invention provides a time determination system based on multiple time service signals, the time determination system adopts a hierarchical control mode to synchronize the time, wherein: the hierarchical control includes: k-level nodes, wherein K is a positive integer; when i takes 1, a time server in each node in the ith level node is synchronous with a time reference; and when i is a positive integer from 2 to K, a time server in each node in the ith level node is synchronous with a time server of a corresponding node in the i-1 level node, and the time server in each node in the ith level node is connected with the time server of the corresponding node in the i-1 level node through a wired time service link.
FIG. 8 is a block diagram of a time determination system based on various timing signals in accordance with an embodiment of the present invention. As shown in fig. 8, the time determination system 800 includes: the autonomous integrity monitoring module 801 is configured to receive a wireless time service signal by each time server, and complete respective autonomous integrity monitoring based on the wireless time service signal to determine validity of the wireless time service signal; a time source obtaining module 802, configured to obtain time information of a plurality of time sources and corresponding 1PPS from the wireless time service signal and the wired time service signal received from the wired time service link, where the plurality of time sources include a time source from the wireless time service signal and a time source from the wired time service signal; and a time service integrity monitoring module 803 configured to complete time service integrity monitoring of each of the time servers based on the time information of the plurality of time sources and the corresponding 1PPS, and use the time service integrity monitoring as time service integrity information of the current node.
Specifically, the timing integrity monitoring module 803 is specifically configured to: determining that the time information of each of the plurality of time sources is the same; and determining that a deviation between 1PPS for each of the plurality of time sources is within a threshold range.
Specifically, the hierarchical control further comprises at least one monitoring server, and the monitoring server is used for monitoring service data and working condition data.
Specifically, the wireless time service signal is accessed to the hierarchical control network and directly synchronized with the time reference.
A third aspect of the invention provides a non-transitory computer readable medium having stored thereon instructions which, when executed by a processor, perform the steps of the method for time determination based on a plurality of timing signals according to the first aspect of the invention.
In summary, the technical solution provided by the present disclosure can monitor the working conditions of all devices in the system, the time synchronization states and time synchronization deviations of the nodes and the superior node/the subordinate node, the synchronization deviations of each node with respect to the time reference, and the like, and form a time synchronization situation diagram. Finally, monitoring software monitors the time synchronization state and synchronization deviation of each node in real time to realize time difference situation perception of the whole network. The main functions include:
1) the working condition of the equipment, the time synchronization mode (optical fiber, E1 link, NTP and the like) between the node of the current level and the node of the upper level and the node of the lower level, the time synchronization deviation, the measurement result of the 1PPS time difference in the TS and the like are stored in a monitoring server, and the information can be read in real time.
2) And displaying the time situation in real time. Analyzing and displaying the whole network time synchronization situation, including the equipment working state of each node, the synchronization mode between the upper and lower nodes, the synchronization state and time synchronization deviation, the time deviation between the node and the time reference, the synchronization deviation between the important time system terminal of each node and the TS, and the alarm information; the viewing authority of each node can be set. Finally, the situation of each node can be displayed by a tree structure as shown in fig. 1.
3) And 4, judging the integrity of time service. And according to the time deviation between the upper and lower nodes calculated by the TS and the 1PPS comparison value calculated by the TS internal multi-path time calculation module, the time service integrity judgment of the node is given, and an abnormal alarm or operation prompt is given.
4) A data analysis function is run. According to the time deviation between the upper and lower nodes calculated by the TS and the 1PPS comparison value calculated by the TS internal multi-path time calculating module, the time signal (output signal of the TS) of the node is comprehensively analyzed, and the method comprises the following steps: time deviation and time synchronization precision of the TS and a time reference, time deviation and time synchronization precision between upper and lower nodes, frequency synchronization precision, frequency accuracy, frequency stability and the like.
In conclusion, the technical scheme of the invention has the advantages that the multi-channel time service signal is adopted, the time service integrity detection and high-precision measurement are realized, and the accurate time information can be provided.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A time determination method based on multiple time service signals is characterized in that the time determination method adopts a hierarchical control mode to synchronize the time, wherein:
the hierarchical control includes:
k-level nodes, wherein K is a positive integer;
when i takes 1, a time server in each node in the ith level node is synchronous with a time reference;
when i is a positive integer from 2 to K, a time server in each node in the ith level node is synchronous with a time server of a corresponding node in the i-1 level node, and the time server in each node in the ith level node is connected with the time server of the corresponding node in the i-1 level node through a wired time service link;
the time determination method comprises the following steps:
step S1, each time server receives a wireless time service signal, and completes respective autonomous integrity monitoring based on the wireless time service signal to determine the validity of the wireless time service signal;
step S2, acquiring time information of a plurality of time sources and corresponding 1PPS from the wireless time service signal and the wired time service signal received from the wired time service link, wherein the time sources comprise a time source from the wireless time service signal and a time source from the wired time service signal; and
and step S3, finishing the time service integrity monitoring of each time server based on the time information of the plurality of time sources and the corresponding 1PPS, and using the time service integrity monitoring as the time service integrity information of the current node.
2. The method for determining time based on multiple timing signals according to claim 1, wherein the step S3 specifically includes:
step S31, determining that the time information of each of the plurality of time sources is the same; and
step S32, determining that the deviation between 1PPS of each of the plurality of time sources is within a threshold range.
3. The method for determining time based on multiple time service signals according to claim 2, wherein the hierarchical control further comprises at least one monitoring server, and the monitoring server is used for monitoring service data and working condition data.
4. The method of claim 1, wherein the wireless time service signal is accessed to the hierarchically controlled network and directly synchronized to the time reference.
5. A time determination system based on various time service signals is characterized in that the time determination method adopts a hierarchical control mode to synchronize the time, wherein:
the hierarchical control includes:
k-level nodes, wherein K is a positive integer;
when i takes 1, a time server in each node in the ith level node is synchronous with a time reference;
when i is a positive integer from 2 to K, a time server in each node in the ith level node is synchronous with a time server of a corresponding node in the i-1 level node, and the time server in each node in the ith level node is connected with the time server of the corresponding node in the i-1 level node through a wired time service link;
the time determination system includes:
the autonomous integrity monitoring module is configured to receive a wireless time service signal by each time server and complete respective autonomous integrity monitoring respectively based on the wireless time service signal so as to determine the validity of the wireless time service signal;
the time source acquisition module is configured to acquire time information of a plurality of time sources and corresponding 1PPS from the wireless time service signal and the wired time service signal received from the wired time service link, wherein the plurality of time sources comprise a time source from the wireless time service signal and a time source from the wired time service signal; and
and the time service integrity monitoring module is configured to complete time service integrity monitoring of each time server based on the time information of the plurality of time sources and the corresponding 1PPS, and the time service integrity monitoring is used as time service integrity information of the current node.
6. The system for time determination based on multiple time service signals according to claim 5, wherein the time service integrity monitoring module is specifically configured to:
determining that the time information of each of the plurality of time sources is the same; and
determining that a deviation between 1PPS for each of the plurality of time sources is within a threshold range.
7. The time determination system according to claim 5, wherein the hierarchical control further comprises at least one monitoring server for monitoring traffic data and operating condition data.
8. The system of claim 5, wherein the wireless time service signal is accessed to the hierarchically controlled network and directly synchronized to the time reference.
9. A non-transitory computer readable medium storing instructions which, when executed by a processor, perform the steps of the method for time determination based on a plurality of timing signals according to any one of claims 1-4.
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