A standard time service system that fuses alignment, monitoring, and time dissemination

Abstract

The application discloses a standard time service system fusing alignment, monitoring and time service, relates to the field of signal processing, and comprises a standard time trace source subsystem, a standard time service and performance monitoring subsystem and a standard time reproduction subsystem; the standard time trace source subsystem accesses a master clock signal generated by a time keeping laboratory and generates standard time reference data, the standard time service and performance monitoring subsystem sends the standard time reference data to the standard time reproduction subsystem, the standard time reproduction subsystem generates a local time signal, determines a first time deviation by adopting a remote time alignment technology, adjusts the local time signal based on the deviation, and takes the adjusted local time signal as a time service signal for a user; the standard time service and performance monitoring subsystem monitors whether the time deviation exceeds a set threshold value in real time, and issues a warning signal if the time deviation exceeds the set threshold value. The application unifies time reference, is high in time synchronization precision and realizes unified monitoring of system time synchronization performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of signal processing, in particular to a standard time service system fusing comparison, monitoring and time service. BACKGROUND

[0002] In view of the seamless, unified and fused space-time service target of the national comprehensive space-time system (PNT) to users, the system time of the PNT system needs to be unified with the standard time, so as to provide multi-source and fused space-time information service for users.

[0003] At present, the BeiDou satellite navigation system, long and short wave time service system, network time service system and PNT system under construction in China have time service function, and the time keeping laboratories for system time tracing are different, the deviations between the time keeping laboratories coordinated universal time (UTC(k)) cannot be obtained in real time, the high-precision remote time comparison technology and equipment used are different, and there may be systematic deviation between the comparison technology or comparison equipment, which leads to several nanoseconds or even tens of nanoseconds difference between the system time of each system, and further causes the time obtained by users using different time service systems to be not unified, and affects the unified degree of the time obtained by users through various time service systems. In addition, the deviation between the current system time of each time service system and the first time, and whether the state is normal, also lack unified monitoring and evaluation means, which is not conducive to the fused use of various time service systems by users.

[0004] In view of the above status, a standard time service system fusing comparison, monitoring and time service is needed to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a standard time service system fusing comparison, monitoring and time service, to solve the problems of non-unified time reference, low time synchronization precision and lack of unified monitoring of system time synchronization performance.

[0006] To achieve the above purpose, the present application provides the following solutions:

[0007] The present application provides a standard time service system fusing comparison, monitoring and time service, which comprises a standard time tracing subsystem, a standard time service and performance monitoring subsystem and a standard time reproduction subsystem.

[0008] The standard time trace subsystem includes a standard time trace device deployed in a time keeping laboratory; the standard time trace device is connected with the standard time service and performance monitoring subsystem, used to access the master clock signal of standard time coordinated universal time generated by the corresponding time keeping laboratory, and generate standard time reference data based on the master clock signal, and send the standard time reference data to the standard time service and performance monitoring subsystem;

[0009] The standard time service and performance monitoring subsystem is connected with the standard time reproduction subsystem, used to send the received standard time reference data to the standard time reproduction subsystem;

[0010] The standard time reproduction subsystem is connected with a standard time demand user, used to generate a local time signal synchronized with the master clock signal of standard time coordinated universal time generated by the time keeping laboratory, determine a first time deviation between the local time signal and the master clock signal of standard time coordinated universal time generated by the time keeping laboratory based on the local time signal and the received standard time reference data by using remote time comparison technology, adjust the local time signal based on the first time deviation, and send the adjusted local time signal as a final time signal to the standard time demand user to complete time service;

[0011] The standard time service and performance monitoring subsystem is also used to monitor whether the time deviation exceeds a set threshold in real time, and send a warning signal when the time deviation exceeds the set threshold; the time deviation is the first time deviation between the master clock signal of standard time coordinated universal time generated by each time keeping laboratory and the local time signal, and the time deviation between the standard time coordinated universal time jointly generated by different time keeping laboratories and the master clock signal of standard time coordinated universal time generated by each time keeping laboratory.

[0012] Optionally, the standard time trace device includes a first time difference measurement module, a first master control module and a first remote time transfer / comparison module;

[0013] The first remote time transfer / comparison module is connected with the first master control module, used to fuse multiple remote time comparison technologies, generate first local observation data required for remote comparison, and send the first local observation data to the first master control module; and generate a first internal time signal;

[0014] The first time difference measurement module is connected with the first remote time transfer / comparison module and the time keeping laboratory respectively, used to access the master clock signal of standard time coordinated universal time generated by the corresponding time keeping laboratory, and measure the first time difference between the master clock signal and the first internal time signal;

[0015] The first master module is connected with the first time difference measurement module, configured to acquire the first local observation data and the first time difference, and generate the standard time reference data according to the first local observation data and the first time difference.

[0016] Optionally, the number of the standard time traceability devices is greater than or equal to 2.

[0017] Optionally, the standard time service and performance monitoring subsystem comprises a standard time service cloud platform and a standard time service performance monitoring device.

[0018] The standard time service cloud platform is connected with each of the standard time traceability devices and the standard time reproduction subsystem, configured to forward the received standard time reference data to the standard time reproduction subsystem, monitor whether the time deviation exceeds a set threshold in real time, and send a warning signal when the time deviation exceeds the set threshold.

[0019] The standard time service performance monitoring device is connected with the standard time service cloud platform, configured to log in the standard time service cloud platform, and check the synchronization state between each of the master clock signals and the synchronization state between each of the master clock signals and the local time signal.

[0020] Optionally, the number of the standard time service cloud platform and the standard time service performance monitoring device is multiple.

[0021] Optionally, the standard time reproduction subsystem comprises a standard time reproduction terminal and a standard time demand user.

[0022] The standard time reproduction terminal is deployed at the location of the standard time demand user, connected with the standard time service cloud platform and the standard time demand user respectively, configured to generate a local time signal synchronized with the master clock signal of the standard time coordinated universal time generated by the time-keeping laboratory, and adopt a remote time comparison technology to compare the received standard time reference data with the local time signal to obtain a first time deviation, adjust the local time signal to make the first time deviation tend to zero, and send the adjusted local time signal as a final time signal to the standard time demand user.

[0023] Optionally, when the standard time reference data received by the standard time service cloud platform comes from two or more than two standard time traceability devices at the same time, the standard time service cloud platform matches optimal standard time reference data from each of the standard time reference data according to a preset strategy, and sends the optimal standard time reference data to the standard time reproduction subsystem, and the standard time reproduction subsystem compares the optimal standard time reference data with the local time signal to obtain the first time deviation.

[0024] Optionally, the standard time reproduction terminal includes a clock source, a second time difference measurement module, a second main control module, and a second remote time transmission / comparison module;

[0025] The clock source is connected to the second time difference measurement module and is used to generate a local time signal synchronized with the master clock signal, and send the local time signal to the second time difference measurement module;

[0026] The second remote time transfer / comparison module is connected to the second main control module and is used to integrate multiple remote time comparison technologies, generate the second local observation data required for remote comparison, and send the second local observation data to the second main control module; and generate a second internal time signal;

[0027] The second time difference measurement module is connected to the second remote time transmission / comparison module, the clock source, and the second main control module, respectively. It is used to measure the second time difference between the local time signal and the second internal time signal based on the received local time signal and the second internal time signal, and send the second time difference to the second main control module.

[0028] The second main control module is connected to the second time difference measurement module. It is used to generate local data based on the second local observation data and the second time difference, and to determine the first time deviation based on the received standard time reference data and the local data using remote time comparison technology. It also adjusts the local time signal based on the first time deviation and sends the adjusted local time signal as the final time signal to the user who needs standard time.

[0029] Optionally, the deviation between the adjusted local time signal and the standard time-coordinated universal clock signal generated by the timekeeping laboratory is less than 5 ns.

[0030] Optionally, the remote time comparison technology is one or a combination of wired fiber optic bidirectional time-frequency transmission technology, GNSS real-time common-view technology based on radio signals, GNSS real-time full-view technology based on radio signals, GNSS PPP real-time comparison technology based on radio signals, or GNSS carrier phase real-time common-view technology based on radio signals.

[0031] According to the specific embodiments provided in this application, the following technical effects are disclosed:

[0032] This application provides a standard time service system that integrates comparison, monitoring, and time synchronization. It monitors in real time the time deviation between master clock signals of Coordinated Universal Time (UTC) generated by different timekeeping laboratories, ensuring that the time reference of the time synchronization signals for users requiring standard time is traced back to standard time, thus solving the problem of inconsistent sources. Furthermore, this application can transmit the master clock signal of any timekeeping laboratory to users worldwide, with the recovered time signal deviating from the master clock signal by no more than 5ns, resulting in high system time synchronization accuracy. It can monitor the time synchronization status of the entire system, addressing the lack of unified monitoring of system time in existing time synchronization systems. Simultaneously, the time synchronization and synchronization performance monitoring functions are integrated into a single system, allowing for reasonable function reuse and improving equipment integration. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of a standard time service system that integrates comparison, monitoring and time synchronization according to an embodiment of this application;

[0035] Figure 2 for Figure 1 A detailed functional module diagram of the standard time traceability device in the standard time service system for fusion comparison, monitoring and time synchronization;

[0036] Figure 3 for Figure 1 A detailed functional module diagram of the standard time reproduction terminal in the standard time service system for fusion comparison, monitoring and time synchronization.

[0037] Symbol explanation:

[0038] Standard Time Traceability Subsystem -1, Timekeeping Laboratory -11, Standard Time Traceability Equipment -12, First Time Difference Measurement Module -121, First Main Control Module -122, First Remote Time Transmission / Comparison Module -123; Standard Time Service and Performance Monitoring Subsystem -2, Standard Time Service Cloud Platform -21, Standard Time Service Performance Monitoring Equipment -22; Standard Time Reproduction Subsystem -3, Standard Time Reproduction Terminal -31, Clock Source -311, Second Time Difference Measurement Module -312, Second Main Control Module -313, Second Remote Time Transmission / Comparison Module -314, Standard Time Requirement User -32;

[0039] Among them, the timekeeping laboratory 11 includes timekeeping laboratories 1101 to 110n; the standard time traceability equipment 12 includes standard time traceability equipment 1201 to 120n; the standard time service cloud platform 21 includes standard time service cloud platform 2101 to 2102; the standard time service performance monitoring equipment 22 includes standard time service performance monitoring equipment 2201 to 2202; the standard time reproduction terminal 31 includes standard time reproduction terminal 3101 to 310n; and the standard time demand users 32 include standard time demand users 3201 to 320n. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Definitions:

[0043] Coordinated Universal Time (UTC) is the internationally used standard time.

[0044] A timekeeping laboratory is an institution registered with the International Bureau of Weights and Measures (IBFT) to produce standard time UTC(k), or an institution capable of generating time signals with a deviation of less than 100 ns from standard UTC through direct or indirect traceability, operating continuously and stably for more than one year, and possessing at least three timekeeping atomic clocks. The physical realization of Coordinated Universal Time (UTC) produced by a timekeeping laboratory is named UTC(k), where k is an abbreviation for Timekeeping Laboratory, and UTC(k) is the standard time of a country.

[0045] In one exemplary embodiment, such as Figure 1 As shown, a standard time service system integrating comparison, monitoring, and time synchronization is provided, comprising: a standard time tracing subsystem 1, a standard time service and performance monitoring subsystem 2, and a standard time reproduction subsystem 3. The standard time tracing subsystem 1 and the standard time reproduction subsystem 3 are deployed in different locations and are connected through the standard time service and performance monitoring subsystem 2. For example... Figure 1 As shown, the timekeeping laboratory 11 includes timekeeping laboratories 1101 to 110n.

[0046] The standard time traceability subsystem 1 includes a standard time traceability device 12 deployed within a timekeeping laboratory 11, forming a flexible organizational mode where standard times from multiple locations can be distributed and accessed from the system. The standard time traceability device 12 is connected to the standard time service and performance monitoring subsystem 2, and is used to access the master clock signal of Coordinated Universal Time (UTC) generated by the corresponding timekeeping laboratory 11, generate standard time reference data based on the master clock signal, and send the standard time reference data to the standard time service and performance monitoring subsystem 2. The standard time traceability device 12 is equipped with a reference based on the 1PPS and 10MHz signal of the standard time UTC(k) master clock of each timekeeping laboratory 11, and supports various high-precision remote time comparison technologies. The requirement is that the UTC(k) of the timekeeping laboratory 11 used as the standard time traceability reference must deviate from UTC by less than 10ns, while the International Bureau of Weights and Measures recommends that the UTC(k) deviate from UTC by less than 100ns. The UTC(k) in this application has a smaller deviation from UTC and higher accuracy. The standard time tracing device 12, based on the high-precision remote time comparison technology supported by the system, generates the standard time reference data required for standard time reproduction, and transmits it in real time via wired or wireless media. For example, Figure 1 As shown, the standard time traceability device 12 includes standard time traceability devices 1201 to 120n.

[0047] As an optional implementation, to improve system robustness, the number of standard time tracking devices 12 is greater than or equal to two. Standard time tracking devices 12 are deployed in two or more remote timekeeping laboratories 11 to generate reference data in parallel.

[0048] As an optional implementation method, such as Figure 2 As shown, the standard time traceability device 12 includes a first time difference measurement module 121, a first main control module 122, and a first remote time transmission / comparison module 123.

[0049] The first remote time transfer / comparison module 123 is connected to the first main control module 122 and is used to integrate multiple remote time comparison technologies, generate the first local observation data required for remote comparison, and send the first local observation data to the first main control module 122; and generate a first internal time signal.

[0050] The first time difference measurement module 121 is connected to the first remote time transfer / comparison module 123 and the timekeeping laboratory 11 respectively, and is used to access the master clock signal of Coordinated Universal Time (UTC) generated by the corresponding timekeeping laboratory 11, and measure the first time difference between the master clock signal and the first internal time signal.

[0051] The first main control module 122, connected to the first time difference measurement module 121, is used to acquire the first local observation data and the first time difference, and generate the standard time reference data based on the first local observation data and the first time difference. The standard time reference data is the reference data required to support direct comparison between the standard time reproduction terminal 31 and the standard time UTC(k) of the timekeeping laboratory. It is transmitted to the standard time service and performance monitoring subsystem 2 via a communication port such as a network port or serial port. Furthermore, to increase data security, the data is encrypted.

[0052] Specifically, the remote time comparison technology is one or a combination of several of the following: wired fiber optic bidirectional time-frequency transfer technology, GNSS real-time common-view technology based on radio signals, GNSS real-time full-view technology based on radio signals, GNSS PPP real-time comparison technology based on radio signals, or GNSS carrier phase real-time common-view technology based on radio signals. The remote comparison uncertainty of each of these remote time comparison technologies is better than 2 ns. The system's functionality and performance rely on high-precision remote comparison between standard time UTC(k) and the output time of the user's location standard time reproduction subsystem 3. The aforementioned remote time comparison technologies can be applied individually or in combination, depending on actual needs. The working principles of each high-precision remote time transfer / comparison technology are relatively mature, and will not be elaborated upon further in this application. This explanation is only for the specific requirements of remote high-precision comparison in this application. The difference from general remote high-precision time comparison technology lies in two points: First, it is near real-time, requiring the comparison to be completed quickly, with the comparison result generation cycle generally not exceeding 1 minute; Second, it integrates and uses multiple comparison technologies, complementing and enhancing each other, and verifying the integrity of each other to ensure the reliability of time services. The application is not limited by the length of the comparison baseline.

[0053] The standard time service and performance monitoring subsystem 2 is connected to the standard time reproduction subsystem 3 and is used to send the received standard time reference data to the standard time reproduction subsystem 3. It is also used to monitor in real time whether the time deviation exceeds a set threshold, and to issue a warning signal when the time deviation exceeds the set threshold. The time deviation is the time deviation between the master clock signal of Coordinated Universal Time (UTC) generated by each timekeeping laboratory 11 and the local time signal, and the time deviation between the UTC generated jointly by different timekeeping laboratories 11 and the master clock signal of the UTC generated by each timekeeping laboratory 11. The UTC generated by each timekeeping laboratory 11 has a master clock (a physical entity), while the UTC generated jointly by different timekeeping laboratories 11 is a UTC without a master clock (no physical entity).

[0054] As an optional implementation, the standard time service and performance monitoring subsystem 2 includes a standard time service cloud platform 21 and a standard time service performance monitoring device 22.

[0055] The standard time service cloud platform 21 is connected to each of the standard time traceability devices 12 and the standard time reproduction subsystem 3. It forwards the received standard time reference data to the standard time reproduction subsystem 3, monitors in real time whether the time deviation exceeds a set threshold, and issues an early warning signal when the time deviation exceeds the set threshold. This achieves intelligent matching of information and secure, reliable data transmission between the standard time traceability devices 12 and the standard time reproduction terminal 31, as well as monitoring the time deviation between the time signals and the standard time from the time signals of the timekeeping laboratory and standard time demand users 32 within the system. For example, Figure 1 As shown, the standard time service cloud platform 21 includes standard time service cloud platforms 2101 to 2102.

[0056] Specifically, a standard time service cloud platform 21, which constructs a data cloud processing model, deploys the software and data flowing within the system in the cloud. The basic functions of the software include data analysis, processing, and forwarding, as well as graphically displaying the deviations between different timekeeping laboratory standard times (UTC(k)) and the deviations between the local time signals generated by each standard time reproduction terminal 31 and the corresponding source timekeeping laboratory standard time (UTC(k)) master clock signal. The data forwarding function refers to intelligently matching the optimal standard time reference data to a specified range of standard time reproduction terminals 31 according to a preset strategy. The standard time service cloud platform 21 also supports remote login by administrators to view and monitor system status, and automatic synchronization across multiple deployments.

[0057] The standard time service cloud platform 21 consists of servers, storage devices, data communication devices, and standard time cloud service software. The servers, storage devices, and data communication devices provide support for running the standard time cloud service software and establishing communication between the standard time traceability device 12 and the standard time reproduction terminal 31. It can use public clouds or build its own service cloud. Public clouds include Alibaba Cloud and Tencent Cloud.

[0058] The core functions of the standard time cloud service software must include: ① forwarding the standard time reference data provided by the standard time tracing device 12 to the standard time reproduction terminal 31; ② when standard time reference data from two or more standard time tracing devices 12 are available simultaneously, comparing parameters such as the straight-line distance between the standard time tracing device 12 and the standard time reproduction terminal 31, the stability and accuracy of the master clock signal in the timekeeping laboratory, or intelligently matching the optimal reference data according to the system's preset priority and forwarding it to the standard time reproduction terminal 31 in the designated area; ③ continuously collecting the standard time reference data from each standard time tracing device 12 and the local data from the standard time reproduction terminal 31, and generating data in real time. The system monitors the deviation between the standard time (UTC(k)) of the timekeeping laboratory and the deviation between the local time signal generated by each standard time reproduction terminal 31 and the master clock signal of the corresponding traceable timekeeping laboratory standard time (UTC(k)). It also plots, displays, and stores historical deviation data, and issues an early warning signal when the deviation exceeds a preset threshold. ④ It supports the deployment of multiple sets of standard time cloud service software in different locations, running in parallel, and automatically synchronizing data periodically. It maintains continuous system operation when any software or hardware platform malfunctions. ⑤ It allows administrators or authorized users to access the standard time cloud service software through a designated port or the standard time service performance monitoring device 22 to view the synchronization status between the local time signal provided by each standard time reproduction terminal 31 and the standard time (UTC(k)).

[0059] The standard time service performance monitoring device 22 is connected to the standard time service cloud platform 21 and is used to log in to the standard time service cloud platform 21 to view the synchronization status between the master clock signals and the synchronization status between the master clock signals and the local time signal. For example, Figure 1 As shown, the standard time service performance monitoring device 22 includes standard time service performance monitoring devices 2201 to 2202.

[0060] The standard time reproduction subsystem 3 is connected to the standard time demand user 32 and is used to generate a local time signal synchronized with the master clock signal. Based on the local time signal and the received standard time reference data, the system uses remote time comparison technology to determine the first time deviation between the local time signal and the master clock signal of Coordinated Universal Time (UTC) generated by the timekeeping laboratory. The system then adjusts the local time signal based on the first time deviation and sends the adjusted local time signal as the final time synchronization signal to the standard time demand user 32 to complete the time synchronization.

[0061] As an optional implementation, there are multiple standard time service cloud platforms 21 and multiple standard time service performance monitoring devices 22.

[0062] As an optional implementation, the standard time reproduction subsystem 3 includes a standard time reproduction terminal 31 and a standard time demand user 32. The standard time reproduction terminal 31 is deployed at the location of the standard time demand user 32 and is connected to both the standard time service cloud platform 21 and the standard time demand user 32. It generates a local time signal synchronized with the master clock signal and uses remote time comparison technology to compare the received standard time reference data with the local time signal to obtain the first time deviation. The local time signal is then adjusted to bring the first time deviation close to zero, and the adjusted local time signal is sent to the standard time demand user 32 as the final time signal. Furthermore, one or more time signal monitoring channels can be expanded to test the deviation between external time signals and standard UTC in real time. Regarding the supported high-precision remote time comparison technology, the standard time reproduction terminal 31 corresponds to the standard time tracing device 12. After obtaining standard time reference data through the standard time service cloud platform 21, the standard time reproduction terminal 31 generates the deviation between the local time signal and the master clock signal in real time. Then, based on this deviation and historical deviation data, it generates a control quantity for the local time, controlling the local time to make the deviation approach zero. The number of standard time reproduction terminals 31 deployed can be flexibly expanded according to demand. The number of standard time reproduction terminals 31 that the system can accommodate is mainly related to the configuration of the standard time service cloud platform 21, which limits the system capacity, such as the processor, communication bandwidth, and data storage. Theoretically, the capacity can be unlimited, and in practice, a typical cloud platform and a network bandwidth of hundreds of megabits can accommodate tens of thousands of standard time reproduction terminals 31 running in parallel. Figure 1 As shown, the standard time reproduction terminal 31 includes standard time reproduction terminals 3101 to 310n; the standard time demand user 32 includes standard time demand users 3201 to 320n.

[0063] As an optional implementation method, such as Figure 3 As shown, the standard time reproduction terminal 31 includes a clock source 311, a second time difference measurement module 312, a second main control module 313, and a second remote time transmission / comparison module 314.

[0064] The clock source 311 is connected to the second time difference measurement module 312 and is used to generate a local time signal synchronized with the master clock signal and send the local time signal to the second time difference measurement module 312. The clock source 311 is usually composed of frequency sources that can be tuned, such as rubidium atomic clock, cesium atomic clock, and temperature-controlled voltage-controlled crystal oscillator. Different types of frequency sources can be configured according to actual needs, and no restrictions are imposed here.

[0065] The second remote time transfer / comparison module 314 is connected to the second main control module 313 and is used to integrate multiple remote time comparison technologies, generate the second local observation data required for remote comparison, and send the second local observation data to the second main control module 313; and generate a second internal time signal.

[0066] The second time difference measurement module 312 is connected to the second remote time transmission / comparison module 314, the clock source 311 and the second main control module 313 respectively, and is used to measure the second time difference between the local time signal and the second internal time signal according to the received local time signal and the second internal time signal, and send the second time difference to the second main control module 313.

[0067] The second main control module 313, connected to the second time difference measurement module 312, is used to generate local data based on the second local observation data and the second time difference. Based on the received standard time reference data and the local data, it uses remote time comparison technology to determine the first time deviation and adjusts the local time signal based on the first time deviation. Specifically, it models the clock source 311 using the deviation between the 1PPS local time signal output by the local clock source 311 and UTC(k), and generates control variables for the clock source 311 to synchronize the 1PPS local signal output by the clock source 311 with the UTC(k) master clock signal. Finally, it sends the adjusted local time signal as the final time signal to the standard time requesting user 32. Alternatively, it can access the time signal of the user's own time system, replacing the clock source 311 with the user's own time system signal to obtain the deviation between the user-provided 1PPS signal and the UTC(k) master clock signal, thereby adjusting the local time signal. Simultaneously, it monitors the deviation between the user's own time system reference signal and the standard time UTC(k) in real time. In addition, to facilitate the system's monitoring of the status of various standard time reproduction devices or user reference signals, local data that is remotely compared with the standard time / reference time is sent to the standard time service cloud platform 21 in real time through communication ports such as network ports or serial ports. The data is usually encrypted before transmission.

[0068] As an optional implementation, when the standard time service cloud platform 21 receives standard time reference data from two or more standard time traceability devices 12 simultaneously, the standard time service cloud platform 21 matches the optimal standard time reference data from each of the standard time reference data according to a preset strategy, and sends the optimal standard time reference data to the standard time reproduction subsystem 3. The standard time reproduction subsystem 3 compares the optimal standard time reference data with the local time signal to obtain the first time deviation.

[0069] Preferably, the deviation between the adjusted local time signal and the standard Coordinated Universal Time (UTC) generated by the timekeeping laboratory 11 is less than 5 ns. The International Bureau of Weights and Measures recommends that the deviation of UTC(k) from UTC should be within 100 ns. This application requires that the deviation of each UTC(k) from UTC should be within 10 ns. Through practice, it has been found that this application can transmit the standard time master clock signal of any timekeeping laboratory 11 to users worldwide, and the deviation of the recovered local time signal from UTC(k) does not exceed 5 ns, significantly improving the timekeeping accuracy. Furthermore, when the standard time of any timekeeping laboratory 11 fails, it does not affect the continued provision of time signals synchronized with the standard time to users through other timekeeping laboratories 11.

[0070] Technical effects of this application:

[0071] This application provides a standard time service system that integrates comparison, monitoring, and time synchronization. Through a unified, standardized, and reliable standard time service system and terminal design, it monitors time synchronization performance in real time while also ensuring the reliability of the time service. Specific benefits include the following:

[0072] 1) Unified time reference: High time synchronization accuracy between standard time reproduction devices, reaching less than 5ns. Because standard time traceability devices can simultaneously support multiple high-precision time and frequency transmission technologies, which are currently the most accurate time and frequency transmission technologies; the standard time service cloud platform can test and compensate for deviations between the standard time UTC(k) of various timekeeping laboratories in real time, thereby ensuring that the time reference of the standard time obtained by the standard time reproduction devices using standard time reference data from different timekeeping laboratories is unified.

[0073] 2) The system features a full-process redundant backup design, providing strong resilience against damage and ensuring reliable standard time service. The system supports the simultaneous use of multiple standard time traceability devices, with distributed elastic access to multiple timekeeping laboratories' standard time UTC(k) as system references. The standard time reproduction terminal does not rely solely on any single timekeeping laboratory or standard time traceability device, ensuring reliable generation of standard time reference data. Remote time comparison between standard time traceability devices and standard time reproduction devices supports various remote comparison technologies, including wired and wireless, with mutual backup and enhancement, ensuring reliable remote time comparison. A geographically deployed standard time cloud service platform maintains data synchronization between platforms, ensuring reliable transmission of standard time reference data and reliable generation of standard time service performance monitoring results.

[0074] 3) It supports convenient access and monitoring of the entire system's time synchronization status via multiple terminals simultaneously, solving the problem of the lack of unified monitoring of system time in existing time synchronization systems. Through system architecture design, it supports multiple terminals to simultaneously access and view the time deviation between the output time of all standard time reproduction terminals and the standard time UTC(k) of the timekeeping laboratory within the system, as well as to analyze its stability, accuracy, and other key performance in real time, providing support for improving and optimizing the time synchronization performance within the system.

[0075] 4) Nanosecond-level time synchronization service can cover a wide area, and the system capacity can be expanded according to demand. The design of the standard time service cloud platform and standard time reference data forwarding mode supports the number of standard time reproduction terminals running in parallel, which is only limited by the processing capacity and communication bandwidth of the standard time service cloud platform. The typical capacity is no less than 10,000 units, and it can be further expanded according to demand, which can basically meet the standard time needs of high-precision time users across the country.

[0076] 5) The time synchronization and performance monitoring functions are integrated into one system, and the reuse of functions improves the integration of the equipment. The remote time comparison link of the system is assigned two tasks: time synchronization and monitoring. First, it is necessary to compare the local time signal with the standard time UTC(k), i.e., the master clock signal, to perform time synchronization. Second, it tests the deviation between the local time and the standard time UTC(k) in real time, meeting the requirement of centralized monitoring of the deviation between the local time and the first time. At the same time, the standard time reproduction terminal is planned with a measurement channel expansion function, which can access the reference signal of the user's own time system and monitor the deviation between the user's own time system reference signal and the standard time UTC(k) in real time, providing support for evaluating the performance of the time system and calibrating time deviation.

[0077] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A standard time service system integrating comparison, monitoring, and time synchronization, characterized in that, The standard time service system for fusion comparison, monitoring and time synchronization includes: a standard time traceability subsystem, a standard time service and performance monitoring subsystem and a standard time reproduction subsystem; The standard time traceability subsystem includes standard time traceability equipment deployed in a timekeeping laboratory; the standard time traceability equipment is connected to the standard time service and performance monitoring subsystem, and is used to access the master clock signal of Coordinated Universal Time (UTC) generated by the corresponding timekeeping laboratory, generate standard time reference data based on the master clock signal, and send the standard time reference data to the standard time service and performance monitoring subsystem; the number of standard time traceability equipment is greater than or equal to 2; The standard time service and performance monitoring subsystem is connected to the standard time reproduction subsystem and is used to send the received standard time reference data to the standard time reproduction subsystem. The standard time reproduction subsystem is connected to users who require standard time. It is used to generate a local time signal that is synchronized with the master clock signal of Coordinated Universal Time (UTC) generated by the timekeeping laboratory. Based on the local time signal and the received standard time reference data, it uses remote time comparison technology to determine the first time deviation between the local time signal and the master clock signal of UTC generated by the timekeeping laboratory. Based on the first time deviation, it adjusts the local time signal and sends the adjusted local time signal as the final time signal to users who require standard time to complete the time synchronization. The standard time service and performance monitoring subsystem is also used to monitor in real time whether the time deviation exceeds a set threshold. When the time deviation exceeds the set threshold, an early warning signal is issued. The time deviation is the first time deviation between the master clock signal of Coordinated Universal Time (UTC) generated by each timekeeping laboratory and the local time signal, as well as the time deviation between the Coordinated Universal Time (UTC) generated jointly by different timekeeping laboratories and the master clock signal of the Coordinated Universal Time (UTC) generated by each timekeeping laboratory. The standard time service and performance monitoring subsystem includes a standard time service cloud platform and standard time service performance monitoring equipment. The standard time service cloud platform is connected to each of the standard time traceability devices and the standard time reproduction subsystem. It is used to forward the received standard time reference data to the standard time reproduction subsystem, monitor in real time whether the time deviation exceeds a set threshold, and issue an early warning signal when the time deviation exceeds the set threshold. The standard time service performance monitoring device is connected to the standard time service cloud platform and is used to log in to the standard time service cloud platform to view the synchronization status between each master clock signal and the synchronization status between each master clock signal and the local time signal. The standard time reproduction subsystem includes a standard time reproduction terminal and users who require standard time. The standard time reproduction terminal is deployed at the location of the user requiring standard time and is connected to both the standard time service cloud platform and the user. It is used to generate a local time signal synchronized with the master clock signal of Coordinated Universal Time (UTC) generated by the timekeeping laboratory. It also uses remote time comparison technology to compare the received standard time reference data with the local time signal to obtain the first time deviation, and adjusts the local time signal to make the first time deviation approach zero. Finally, it sends the adjusted local time signal as the final time signal to the user requiring standard time. The standard time reproduction terminal includes a clock source, a second time difference measurement module, a second main control module, and a second remote time transmission / comparison module; The clock source is connected to the second time difference measurement module and is used to generate a local time signal synchronized with the master clock signal, and send the local time signal to the second time difference measurement module; The second remote time transfer / comparison module is connected to the second main control module and is used to integrate multiple remote time comparison technologies, generate the second local observation data required for remote comparison, and send the second local observation data to the second main control module; and generate a second internal time signal; The second time difference measurement module is connected to the second remote time transmission / comparison module, the clock source, and the second main control module, respectively. It is used to measure the second time difference between the local time signal and the second internal time signal based on the received local time signal and the second internal time signal, and send the second time difference to the second main control module. The second main control module is connected to the second time difference measurement module. It is used to generate local data based on the second local observation data and the second time difference, and to determine the first time deviation based on the received standard time reference data and the local data using remote time comparison technology. It also adjusts the local time signal based on the first time deviation and sends the adjusted local time signal as the final time signal to the user who needs standard time.

2. The standard time service system for fusion comparison, monitoring, and time synchronization according to claim 1, characterized in that, The standard time traceability device includes a first time difference measurement module, a first main control module, and a first remote time transmission / comparison module; The first remote time transfer / comparison module is connected to the first main control module and is used to integrate multiple remote time comparison technologies, generate the first local observation data required for remote comparison, and send the first local observation data to the first main control module; and generate a first internal time signal; The first time difference measurement module is connected to the first remote time transfer / comparison module and the timekeeping laboratory, respectively, and is used to access the master clock signal of Coordinated Universal Time (UTC) generated by the corresponding timekeeping laboratory, and measure the first time difference between the master clock signal and the first internal time signal; The first main control module is connected to the first time difference measurement module and is used to acquire the first local observation data and the first time difference, and generate the standard time reference data based on the first local observation data and the first time difference.

3. The standard time service system for fusion comparison, monitoring, and time synchronization according to claim 1, characterized in that, The number of the standard time service cloud platform and the number of the standard time service performance monitoring devices are both multiple.

4. The standard time service system for fusion comparison, monitoring, and time synchronization according to claim 1, characterized in that, When the standard time service cloud platform receives standard time reference data from two or more standard time traceability devices simultaneously, the standard time service cloud platform matches the optimal standard time reference data from each standard time reference data according to a preset strategy, and sends the optimal standard time reference data to the standard time reproduction subsystem. The standard time reproduction subsystem compares the optimal standard time reference data with the local time signal to obtain the first time deviation.

5. The standard time service system for fusion comparison, monitoring, and time synchronization according to claim 1, characterized in that, The time deviation between the adjusted local time signal and the standard time-coordinated universal clock signal generated by the timekeeping laboratory is less than 5 ns.

6. The standard time service system for fusion comparison, monitoring, and time synchronization according to claim 1, characterized in that, The remote time comparison technology is one or a combination of several of the following: wired fiber optic bidirectional time-frequency transmission technology, GNSS real-time common-view technology based on radio signals, GNSS real-time full-view technology based on radio signals, GNSS PPP real-time comparison technology based on radio signals, or GNSS carrier phase real-time common-view technology based on radio signals.

Images