Beidou-based high-speed train time synchronization method and time synchronization reference system

Abstract

The invention provides a Beidou-based high-speed train time synchronization method and time synchronization reference system, and the method comprises the steps: a vehicle-mounted time synchronization reference device obtains Beidou satellite time through receiving a Beidou satellite signal, and the Beidou satellite time serves as a first time source; the vehicle-mounted time synchronization reference device receives a time signal of the ground time synchronization reference device in a remote synchronization mode to obtain ground time, and the ground time serves as a second time source; the vehicle-mounted time synchronization reference device receives calibration compensation from the mobile time calibration source; the vehicle-mounted time synchronization reference device carries out time sequence feature extraction and analysis on the effectiveness of time sources according to a preset arbitration model, weights are dynamically set for different time sources, a time reference signal is calculated in a weighted mode based on the dynamically set weights, and the time reference signal is used for time synchronization in a vehicle-mounted system. According to the invention, high-precision and high-reliability time synchronization between the vehicle and each system on the ground can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of high-speed train time synchronization, and in particular to a Beidou-based high-speed train time synchronization method and a time synchronization reference system. Background Art

[0002] With the development of high-speed railways, higher requirements are placed on the precise control and safety monitoring of train operation. Time synchronization can provide accurate time for each subsystem in a high-speed train. It is the basis for ensuring the coordinated work of each subsystem in the train control system. It is crucial to improving the dispatching efficiency and safety of trains, and plays an important supporting role in the intelligent development of high-speed trains. Time synchronization is the basis for realizing fully automatic driving of high-speed trains. It can ensure the consistency and accuracy of data, and guarantee the coordinated linkage of each subsystem in the signal system, so as to realize automatic driving and automatic door opening and closing of high-speed trains. With the development of 5G technology, the demand for time synchronization of the 5G mobile communication system (5G-R) dedicated to high-speed railways is also increasing, and basic services have microsecond (μs) requirements. Therefore, the improvement of time synchronization accuracy is of great significance to the deployment of 5G-R technology. With the completion of the construction of the BeiDou-3 system, the BeiDou satellite navigation system has global service capabilities, can provide high-precision positioning, navigation and timing services, and has been widely used in various industries. The combination of Beidou navigation technology and railway applications can not only enhance the time synchronization capability of the train network, but also provide more reliable and accurate clock synchronization services for train operation control, which is of great significance for improving the time synchronization accuracy of the train network.

[0003] At present, for most of the onboard systems of high-speed trains, the system time is independent of each other, without time synchronization, and lacks a unified time reference, resulting in large errors between different systems, which greatly restricts the operation safety, operation efficiency improvement, fault data analysis and intelligent development of high-speed trains. With the continuous maturity of satellite navigation systems, many high-speed train onboard application systems have gradually begun to use the satellite navigation system time as the time source. However, the existing train onboard systems based on satellite navigation systems mostly rely on the GPS system, which is susceptible to interference and deception, and has a great impact on the accuracy and security of time. In addition, when the satellite signal is lost, the system does not have the ability to keep time and the time accuracy will be relatively poor. Therefore, it is necessary to carry out research on the Beidou-based high-speed train time synchronization reference system and method, provide a unified time reference on high-speed trains, realize time synchronization between different onboard systems of trains, improve the stability of each system, ensure the operation safety of high-speed trains, improve the railway operation efficiency, and support the development and application of railway intelligent technology in high-speed trains.

[0004] As the speed of EMUs continues to increase, it is becoming increasingly important to maintain time synchronization between vehicles and the ground. At present, there is no effective time synchronization method to achieve time synchronization between the vehicle and the ground system, which greatly restricts the development of intelligent EMUs. In order to achieve time synchronization between their own ground equipment and vehicle equipment, some systems mainly use data packet transmission to transmit time information through the network. The time synchronization accuracy and stability of this method may not meet the needs of high-precision time synchronization, and it depends on the network environment and is easily affected by network delays and packet loss, resulting in lower synchronization accuracy and inability to guarantee the real-time and consistency of time synchronization. Therefore, a high-precision time synchronization method is needed to achieve high-precision and high-reliability time synchronization between vehicles and various ground systems, so as to ensure the safety of train operation, improve operational efficiency, and optimize service experience. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides a Beidou-based high-speed train time synchronization method and a time synchronization reference system to eliminate or improve one or more defects existing in the prior art.

[0006] One aspect of the present invention provides a Beidou-based high-speed train time synchronization method, the method comprising the following steps: an on-board time synchronization reference device obtains Beidou satellite time by receiving Beidou satellite signals, and the Beidou satellite time is used as a first time source; the on-board time synchronization reference device receives a time signal from a ground time synchronization reference device by remote synchronization to obtain ground time, and the ground time is used as a second time source; the on-board time synchronization reference device receives a calibration compensation from a mobile time calibration source; the on-board time synchronization reference device extracts and analyzes time series features of the validity of the time source according to a preset arbitration model, dynamically sets weights for different time sources, and calculates a time reference signal based on the dynamically set weights, and the time reference signal is used for time synchronization in the on-board system.

[0007] In some embodiments of the present invention, the vehicle-mounted time synchronization reference device further includes an anti-interference module, and the method further includes: using the anti-interference module to pre-process and optimize the received Beidou satellite time and ground time.

[0008] In some embodiments of the present invention, the vehicle-mounted time synchronization reference device further includes a time taming module, and the method further includes: using the time taming module to adjust the clock frequency of the vehicle-mounted time synchronization reference device based on a taming algorithm, and continuously monitoring and correcting existing clock deviations.

[0009] In some embodiments of the present invention, the vehicle-mounted time synchronization reference device further comprises a timekeeping module, and the method further comprises: utilizing the timekeeping module to maintain the vehicle-mounted time synchronization reference device to continue to output an accurate time synchronization signal in the absence of a time source.

[0010] In some embodiments of the present invention, the vehicle-mounted time synchronization reference device further includes a management control module, and the method further includes: using the management control module to implement functions including configuration management, status monitoring, fault diagnosis, data storage and log recording.

[0011] In some embodiments of the present invention, the vehicle-mounted system includes a vehicle-mounted time synchronization reference device and multiple vehicle-mounted time synchronization auxiliary devices, and the time reference signal used for time synchronization in the vehicle-mounted system includes: the time synchronization reference device synchronizes the time reference signal to the vehicle-mounted time synchronization auxiliary device, and the vehicle-mounted time synchronization auxiliary device synchronizes the time reference signal to other vehicle-mounted time synchronization auxiliary devices.

[0012] In some embodiments of the present invention, the vehicle-mounted time synchronization auxiliary device further includes a time correction module, and the method further includes: using the time correction module to correct the time error of the vehicle-mounted time synchronization reference device to overcome the time error that may be caused by clock drift or transmission delay.

[0013] Corresponding to the above method, the present invention also provides a Beidou-based high-speed train time synchronization system, comprising: an on-board time synchronization reference device, comprising a synchronous satellite time module, a remote synchronization module and a time source arbitration and compensation module; wherein the synchronous satellite time module is used to obtain Beidou satellite time by receiving Beidou satellite signals, and receive calibration compensation from a mobile time calibration source, and the Beidou satellite time is used as a first time source; the remote synchronization module is used to receive the time signal of a ground time synchronization reference device by remote synchronization to obtain ground time, and the ground time is used as a second time source; the time source arbitration and compensation module is used to extract and analyze the validity of the time source according to a preset arbitration model, dynamically set weights for different time sources, and calculate the time reference signal based on the dynamically set weights, and the time reference signal is used for time synchronization in the on-board system.

[0014] In some embodiments of the present invention, the vehicle-mounted time synchronization reference device also includes an anti-interference module, a time taming module, a punctuality module and a management control module; the vehicle-mounted time synchronization auxiliary device includes a reference synchronization module, a parameter management module, a control module, a signal forwarding module, a synchronization signal output module and a time correction module.

[0015] In some embodiments of the present invention, the high-speed train time synchronization system further includes a ground time synchronization reference device and a mobile time standard source, wherein the ground time synchronization reference device is used to generate ground time, and the mobile time standard source is used to generate calibration compensation.

[0016] The Beidou-based high-speed train time synchronization method proposed in the present invention can set dynamic weights for different time sources based on a preset arbitration model and on the basis of time series feature extraction and analysis. The time reference signal used for time synchronization in the on-board system is calculated by weighted calculation. The obtained time reference signal has higher credibility, and high-precision and high-reliability time synchronization between the vehicle and various ground systems can be achieved, thereby ensuring the safety of train operation, improving operational efficiency and optimizing service experience.

[0017] Additional advantages, purposes, and features of the present invention will be described in part in the following description, and will become apparent to those skilled in the art after studying the following, or may be learned from the practice of the present invention. The purposes and other advantages of the present invention may be achieved and obtained by the structures specifically indicated in the specification and the accompanying drawings.

[0018] Those skilled in the art will appreciate that the objectives and advantages that can be achieved with the present invention are not limited to the above specific description, and the above and other objectives that can be achieved by the present invention will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute a limitation of the present invention. In the drawings:

[0020] Figure 1 This is a high-speed train time synchronization method based on Beidou in one embodiment of the present invention.

[0021] Figure 2 Schematic diagram of the Beidou-based high-speed train time synchronization reference system.

[0022] Figure 3 This is the deployment diagram of the Beidou-based high-speed train time synchronization reference system.

[0023] Figure 4 The present invention is a deployment method 1 of the vehicle-mounted time synchronization reference device and the auxiliary device.

[0024] Figure 5 This is deployment method 2 of the vehicle-mounted time synchronization reference device and the auxiliary device.

[0025] Figure 6 It is the module structure of the vehicle-mounted time synchronization reference device.

[0026] Figure 7 It is the module structure of the vehicle-mounted time synchronization auxiliary device.

[0027] Figure 8 A schematic diagram of the structure of the computer equipment included in the system. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0029] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0030] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, elements, steps or components, but does not exclude the presence or addition of one or more other features, elements, steps or components.

[0031] It should also be noted that, unless otherwise specified, the term “connection” herein may refer not only to a direct connection but also to an indirect connection involving an intermediate.

[0032] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0033] In order to overcome the existing problems of the independence of various systems in high-speed trains, the time asynchronism between different systems, and the lack of time synchronization between trains and the ground in the prior art, the present invention proposes a high-speed train time synchronization method and time synchronization reference system based on Beidou. The method clarifies the functions and roles of various components in the high-speed train time synchronization reference system based on Beidou; proposes a time synchronization method for a high-speed train time synchronization system based on Beidou, designs a technical solution for time synchronization between various systems of the train and the ground; proposes a deployment method for a high-speed train time synchronization reference system based on Beidou, and constructs a time synchronization network between empty trains and the ground; proposes a variety of deployment methods for on-board devices in a high-speed train time synchronization reference system based on Beidou, designs on-board devices in a high-speed train time synchronization reference system based on Beidou, and clarifies the time synchronization process of a high-speed train time synchronization system based on Beidou. The system can provide high-precision time synchronization services to meet the strict requirements of high-speed trains for time accuracy, realize time synchronization between various systems of the train and between the train and the ground system, and provide strong technical support for the safe and efficient operation of high-speed trains.

[0034] Figure 1 A high-speed train time synchronization method based on Beidou is provided in one embodiment of the present invention. The method comprises the following steps:

[0035] Step S110: the vehicle-mounted time synchronization reference device obtains Beidou satellite time by receiving Beidou satellite signals, and the Beidou satellite time is used as the first time source.

[0036] In the specific implementation process, step S110 is implemented by a synchronous satellite time module.

[0037] Step S120: The vehicle-mounted time synchronization reference device receives the time signal of the ground time synchronization reference device through remote synchronization to obtain the ground time, and the ground time is used as the second time source.

[0038] In the specific implementation process, step S110 is implemented by a remote synchronization module.

[0039] Step S130: The vehicle-mounted time synchronization reference device receives a calibration compensation from a mobile time calibration source.

[0040] Step S140: The vehicle-mounted time synchronization reference device extracts and analyzes the time series features of the validity of the time source according to the preset arbitration model, dynamically sets weights for different time sources, and calculates the time reference signal based on the dynamically set weights. The time reference signal is used for time synchronization in the vehicle-mounted system.

[0041] The method is implemented by a vehicle-mounted time synchronization reference device or a vehicle-mounted time synchronization reference device + a vehicle-mounted time synchronization auxiliary device. The scheme compares and analyzes the time sources according to the set arbitration algorithm, selects the most reliable time source, and compensates and corrects the time signal according to the credibility coefficients of different time synchronization signals.

[0042] The Beidou-based high-speed train time synchronization method proposed in the present invention can set dynamic weights for different time sources based on a preset arbitration model and on the basis of time series feature extraction and analysis. The time reference signal used for time synchronization in the on-board system is calculated by weighted calculation. The obtained time reference signal has higher credibility, and high-precision and high-reliability time synchronization between the vehicle and various ground systems can be achieved, thereby ensuring the safety of train operation, improving operational efficiency and optimizing service experience.

[0043] In some embodiments of the present invention, the vehicle-mounted time synchronization reference device further includes an anti-interference module, and the method further includes: using the anti-interference module to pre-process and optimize the received Beidou satellite time and ground time.

[0044] By adopting the embodiment of the invention, the anti-interference module can be used to prevent the received satellite signal lights from being subjected to various intentional or unintentional interferences, thereby improving the anti-interference ability of the signal and improving the effectiveness and reliability of the signal.

[0045] In some embodiments of the present invention, the vehicle-mounted time synchronization reference device further includes a time taming module, and the method further includes: using the time taming module to adjust the clock frequency of the vehicle-mounted time synchronization reference device based on a taming algorithm, and continuously monitoring and correcting existing clock deviations.

[0046] By adopting the embodiment of the invention, long-term drift can be reduced, long-term stability of time can be maintained, and the accuracy of time synchronization can be ensured.

[0047] In some embodiments of the present invention, the vehicle-mounted time synchronization reference device further comprises a timekeeping module, and the method further comprises: utilizing the timekeeping module to maintain the vehicle-mounted time synchronization reference device to continue to output an accurate time synchronization signal in the absence of a time source.

[0048] By adopting the embodiment of the invention, the time accuracy of the vehicle-mounted time synchronization reference device can be maintained in the absence of a time source, and the output of a high-precision time synchronization signal can be continuously maintained.

[0049] In some embodiments of the present invention, the vehicle-mounted time synchronization reference device further includes a management control module, and the method further includes: using the management control module to implement functions including configuration management, status monitoring, fault diagnosis, data storage and log recording.

[0050] By adopting the embodiment of the invention, the management control module can be used to perform global monitoring to achieve management and control of the entire device.

[0051] In some embodiments of the present invention, the vehicle-mounted system includes a vehicle-mounted time synchronization reference device and multiple vehicle-mounted time synchronization auxiliary devices, and the time reference signal is used for time synchronization in the vehicle-mounted system, including: the time synchronization reference device synchronizes the time reference signal to the vehicle-mounted time synchronization auxiliary device, and the vehicle-mounted time synchronization auxiliary device synchronizes the time reference signal to other vehicle-mounted time synchronization auxiliary devices. This embodiment is implemented by the reference synchronization module, parameter management module, control module, signal forwarding module and synchronization signal output module included in the vehicle-mounted time synchronization auxiliary device.

[0052] By adopting this embodiment of the invention, a time reference signal can be synchronously transmitted between an on-vehicle time synchronization reference device and a plurality of on-vehicle time synchronization auxiliary devices.

[0053] In some embodiments of the present invention, the vehicle-mounted time synchronization auxiliary device further includes a time correction module, and the method further includes: using the time correction module to correct the time error of the vehicle-mounted time synchronization reference device to overcome the time error that may be caused by clock drift or transmission delay.

[0054] By adopting this embodiment of the invention, the time correction module can be used to further correct and optimize the time information obtained from the reference synchronization module to ensure the accuracy of the time information, and the accuracy of the vehicle-mounted time synchronization auxiliary device can be improved by continuously correcting the time deviation.

[0055] Correspondingly, on the other hand, the present invention proposes a Beidou-based high-speed train time synchronization system, which includes: an on-board time synchronization reference device, including a synchronous satellite time module, a remote synchronization module and a time source arbitration and compensation module; wherein the synchronous satellite time module is used to obtain Beidou satellite time by receiving Beidou satellite signals, and receive calibration compensation from a mobile time calibration source, and the Beidou satellite time is used as a first time source; the remote synchronization module is used to receive the time signal of a ground time synchronization reference device by remote synchronization to obtain ground time, and the ground time is used as a second time source; the time source arbitration and compensation module is used to extract and analyze the validity of the time source according to a preset arbitration model, dynamically set weights for different time sources, and calculate the time reference signal based on the dynamically set weights, and the time reference signal is used for time synchronization in the on-board system.

[0056] In some embodiments of the present invention, the vehicle-mounted time synchronization reference device further comprises an anti-interference module, a time taming module, a time keeping module and a management control module. The vehicle-mounted time synchronization auxiliary device comprises a reference synchronization module, a parameter management module, a control module, a signal forwarding module, a synchronization signal output module and a time correction module.

[0057] In some embodiments of the present invention, the high-speed train time synchronization system further includes a ground time synchronization reference device and a mobile time standard source, wherein the ground time synchronization reference device is used to generate ground time, and the mobile time standard source is used to generate calibration compensation.

[0058] Figure 2 The diagram shows the composition of the Beidou-based high-speed train time synchronization reference system. The Beidou-based high-speed train time synchronization reference system mainly consists of four parts: the on-board time synchronization reference device, the on-board time synchronization auxiliary device, the ground time synchronization reference station and the mobile time calibration source.

[0059] The on-board time synchronization reference device is the main core component of the system. By receiving signals from the Beidou satellite navigation system, it can synchronize with the Beidou time (BDT), thereby providing a unified time reference source for various systems on the train. This device is an indispensable part of the system. Through this device, a unified time source can be provided for various devices on the high-speed train to achieve time synchronization of various systems on the train. The on-board time synchronization reference device has functions such as anti-interference, satellite time synchronization, time calibration, time source arbitration, remote synchronization, time taming and punctuality. The on-board time synchronization reference device has a time synchronization interface, which can provide time synchronization services for the on-board systems of high-speed trains.

[0060] The on-board time synchronization auxiliary device is a component that assists the on-board time synchronization reference device in time synchronization on the train. It receives the time synchronization reference signal of the reference device to correct its own time, and outputs the time synchronization signal to provide the on-board system with the time synchronization signal. The on-board time synchronization auxiliary device has the function of forwarding the time synchronization signal, which can correct and forward the time synchronization signal of the on-board time synchronization reference device, thereby realizing time synchronization between multiple synchronization auxiliary devices in a cascade manner, and then building a train time synchronization network to ensure the time synchronization accuracy of the entire train.

[0061] The ground time synchronization reference device is a component deployed on the ground to provide high-precision time reference signals. This reference device not only receives satellite navigation signals to achieve time synchronization with satellite time, but also achieves time synchronization with other nodes through high-precision time comparison and time transfer technology. The device can collect meteorological data to correct atmospheric delay parameters, thereby improving the accuracy of time synchronization. The device uses high-precision and high-stability clock technology to ensure high reliability of time synchronization. The device has a time synchronization output signal, which can transmit the time synchronization signal to the vehicle-mounted time synchronization reference device, and can also output the time synchronization signal to the mobile time calibration source.

[0062] The mobile time calibration source is a component used to achieve high-precision time synchronization between the ground time synchronization reference device and the vehicle-mounted time synchronization reference device, thereby achieving high-precision time transmission between the vehicle and the ground, ensuring the time accuracy between each vehicle system and the ground system, and thus achieving time synchronization between the air vehicle and the ground. It has a time synchronization input signal interface, can receive the time synchronization signal of the ground time synchronization reference device, and has time frequency parameter prediction, taming control and error parameter analysis, thereby ensuring the time accuracy of the system.

[0063] Figure 3 This is the deployment diagram of the Beidou-based high-speed train time synchronization reference system.

[0064] The on-board time synchronization reference device is a key component for achieving time synchronization of various systems on the train and needs to be deployed in the train. The device can be deployed separately in the vehicle to provide time synchronization for various systems on the vehicle. In this case, the on-board system to be synchronized on the train needs to be directly connected to the on-board time synchronization reference device to achieve time synchronization between various systems.

[0065] The on-board time synchronization reference device can form an on-board time synchronization network with the on-board time synchronization auxiliary device to provide time synchronization signals for on-board systems in different parts of the entire train. The on-board time synchronization network can be deployed in two main ways on the train according to different application scenarios, namely: Figure 3 shown.

[0066] Figure 4The deployment mode 1 of the vehicle-mounted time synchronization reference device and auxiliary device. Deployment mode 1 mainly deploys the vehicle-mounted time synchronization reference device at the head position of both ends of the train, and deploys the vehicle-mounted time synchronization auxiliary device in other carriages of the train. The number and location of the vehicle-mounted time synchronization auxiliary device can be determined according to the number of systems that need to be synchronized in the carriage. The synchronized system can be connected to the nearest vehicle-mounted time synchronization reference device and vehicle-mounted time synchronization auxiliary device to achieve high-precision time synchronization. After the vehicle-mounted time synchronization auxiliary device connected to the vehicle-mounted time synchronization reference device obtains the time reference signal, it forwards it to the adjacent auxiliary device. The vehicle-mounted time synchronization auxiliary device that is not directly connected to the vehicle-mounted time synchronization reference device achieves time synchronization with the reference device by receiving the corrected time synchronization signal forwarded by other auxiliary devices. The vehicle-mounted time synchronization reference devices can correct and compensate for the errors of the entire vehicle time network through the signals forwarded by the auxiliary devices. When one of the reference devices fails, it will not cause the loss of the entire vehicle time signal. This deployment mode improves the reliability of system time synchronization, can achieve compensation and calibration of the entire vehicle time network, and takes into account the installation mode of the existing train vehicle satellite antenna.

[0067] Figure 5 This is deployment method 2 for the on-board time synchronization reference device and auxiliary device. Deployment method 2 mainly deploys a set of on-board time synchronization reference devices in the train, and on-board time synchronization auxiliary devices are deployed in other locations. The number of deployments can be determined according to the number of systems that need to be synchronized. The deployment location of the on-board time synchronization reference device can be determined according to the actual situation. It can be deployed at the front of the train or in the carriage. After the on-board time synchronization auxiliary device connected to the on-board time synchronization reference device obtains the time reference signal, it forwards it to the adjacent auxiliary device. The on-board time synchronization auxiliary device that is not directly connected to the on-board time synchronization reference device achieves time synchronization with the reference device by receiving the corrected time synchronization signal forwarded by other auxiliary devices. This deployment method is more flexible, and the deployment relationship between the on-board time synchronization reference device and the on-board time synchronization auxiliary device can be determined according to the actual deployment environment of the vehicle.

[0068] In the specific implementation process, the ground time synchronization reference device is mainly deployed in the ground machine room. The device can directly transmit the time synchronization signal with the vehicle-mounted time synchronization reference device through network communication, or it can perform time synchronization indirectly through a mobile time calibration source.

[0069] In the specific implementation process, the mobile time calibration source is a miniaturized time calibration device that can be freely carried. The calibration source can be deployed in the ground machine room to trace and synchronize with the ground time synchronization reference device; it can be deployed in the vehicle as the time synchronization calibration signal of the vehicle-mounted time synchronization reference device, providing the calibration parameters of the ground time synchronization signal for the vehicle-mounted system.

[0070] Figure 6 The module structure of the vehicle-mounted time synchronization reference device. The vehicle-mounted time synchronization reference device mainly consists of 9 modules, namely: anti-interference module, synchronous satellite time module, time calibration module, remote synchronization module, management control module, time source arbitration and compensation module, time synchronization interface module, time taming module and punctuality module. Specifically:

[0071] (1) The anti-interference module is mainly used to protect the received satellite signals from various intentional or unintentional interferences. By preprocessing and optimizing the received signals, the anti-interference ability of the signals is improved, and the effectiveness and reliability of the signals are improved.

[0072] (2) The synchronous satellite time module mainly analyzes the received satellite signals, obtains the time of the satellite navigation system, and synchronizes with the time.

[0073] (3) The time calibration module is mainly used to receive the time signal from the external calibration source and calibrate the difference between the device itself and other time sources to ensure the accuracy of time synchronization.

[0074] (4) The remote synchronization module is mainly used to achieve time synchronization with the ground time synchronization reference device through wireless network signals, thereby realizing more diverse time synchronization methods.

[0075] (5) The management and control module mainly controls the coordinated and effective operation of each module and realizes the management and control of the entire device, including: configuration management, status monitoring, fault diagnosis, data storage and log recording, etc.

[0076] (6) The time source arbitration and compensation module mainly compares and analyzes the time sources according to the set arbitration model, determines the credibility of different time sources, assigns different credibility coefficients or weights to different time sources, and compensates and corrects the time signals according to the credibility coefficients of the time signals of different time sources to ensure the stability and accuracy of time synchronization. Among them, the arbitration model is based on the self-adjusting weight arbitration algorithm of time series analysis. The algorithm mainly extracts and analyzes the time series features of the validity of the time source, dynamically adjusts the pre-set time source weights according to the time series characteristics, sets higher weights for highly reliable time sources, and uses adaptive learning to select appropriate time sources. Among them, the credibility coefficient is calculated by normalizing the weights.

[0077] (7) The time synchronization interface module mainly provides an interface with the synchronized vehicle system, so that the time synchronization information can be used by other systems or devices, thereby realizing the time synchronization between different systems in the entire vehicle. This module supports the use of standard time synchronization protocols, and the interfaces and protocols used include but are not limited to the following interfaces: 1PPS, DCF77, IRIG-B, NTP, PTP and fixed frequency pulse output signal interface.

[0078] (8) The time taming module mainly adjusts the clock frequency of the on-board time synchronization reference device through the taming algorithm to reduce long-term drift and maintain the long-term stability of time. It also ensures the accuracy of time synchronization by continuously monitoring and correcting the existing clock deviation.

[0079] (9) The timekeeping module is mainly used to maintain the time accuracy of the on-board time synchronization reference device when there is no time source, such as when satellite signals are unavailable, and can continuously output high-precision time synchronization signals.

[0080] Figure 7 The module structure of the vehicle-mounted time synchronization auxiliary device. The vehicle-mounted time synchronization auxiliary device is mainly composed of 6 modules, namely: reference synchronization module, time correction module, parameter management module, control module, signal forwarding module and synchronization signal output module. Specifically:

[0081] (1) The reference synchronization module is the core of the entire vehicle-mounted time synchronization auxiliary device. It is responsible for receiving the time synchronization signal of the vehicle-mounted time synchronization reference device to obtain an accurate time reference, thereby ensuring that the time is consistent with the reference device.

[0082] (2) The time correction module is mainly used to further correct and optimize the time information obtained from the reference synchronization module. It uses algorithms to adjust and compensate for various possible time errors, such as clock drift and transmission delay, to ensure the accuracy of time information. By continuously correcting time deviations, the accuracy of the vehicle-mounted time synchronization auxiliary device is improved.

[0083] (3) The parameter management module is mainly used to manage and configure various parameters of the vehicle-mounted time synchronization auxiliary device, including the frequency, correction parameters, synchronization strategy, etc. of time synchronization. The time synchronization settings can be adjusted according to specific needs to adapt to different application scenarios and environmental conditions. The flexibility and configurability of the parameter management module are crucial to achieving the best time synchronization effect.

[0084] (4) The control module is mainly used to coordinate and control other modules of the vehicle-mounted time synchronization auxiliary device to ensure that they work according to the predetermined logic and sequence. It monitors the status of each module, handles abnormal situations, and performs necessary adjustments to maintain the continuity and stability of time synchronization. It is the key to ensure the efficient operation of the vehicle-mounted time synchronization system.

[0085] (5) The signal forwarding module mainly forwards the time synchronization signal obtained from the vehicle-mounted time synchronization reference device to other auxiliary devices, ensuring the propagation and distribution of the time synchronization signal in the entire network so that all relevant systems can receive accurate time information. It is very important for achieving time consistency between various systems within the vehicle.

[0086] (6) The synchronization signal output module is mainly responsible for outputting the corrected and optimized time signal to the various on-board systems and devices in the vehicle that need to be synchronized. It provides stable time synchronization output to ensure that all systems receiving the time synchronization signal can operate based on a unified time reference, which is essential for achieving precise control and coordination of vehicle systems. This module supports the use of standard time synchronization protocols, and the interfaces and protocols used include but are not limited to the following interfaces: 1PPS, DCF77, IRIG-B, NTP, PTP and fixed frequency pulse output signal interface.

[0087] In a specific embodiment of the present invention, a method for performing time synchronization of a high-speed train based on Beidou includes the following steps: (1) The on-board time synchronization reference device can obtain Beidou satellite time by receiving Beidou satellite signals, and the time can be used as one of the time sources of the on-board time reference device. (2) The on-board time synchronization reference device can receive the time signal of the ground time synchronization reference device by remote synchronization, and the time can be used as one of the time sources of the on-board time reference device. (3) The on-board time synchronization reference device forms a stable and reliable time reference signal through time source arbitration, compensation and time taming. (4) The on-board time synchronization reference device outputs the time reference signal as a time synchronization signal available to each on-board system through the time synchronization interface, and performs time synchronization on the on-board system directly connected to it. (5) The on-board time synchronization auxiliary device receives the time reference signal of the on-board time synchronization reference device, performs time correction and parameter compensation on the reference signal, and achieves time synchronization with the on-board time synchronization reference device, and performs time synchronization on the on-board system directly connected to it through the output signal; at the same time, the device forwards the time signal synchronized with the on-board time synchronization reference device to the on-board time synchronization auxiliary device connected to it. (6) The mobile time calibration source receives the time synchronization signal from the ground synchronization reference device to achieve time traceability with the ground synchronization reference device and maintain high-precision time stability. (7) The stabilized mobile time calibration source is connected to the vehicle-mounted time synchronization reference device to perform time calibration on the vehicle-mounted time synchronization reference device. (8) After receiving the time synchronization signal from the mobile time calibration source, the vehicle-mounted time synchronization reference device calibrates and compensates the time reference signal to form a time reference signal that is consistent with the ground synchronization reference device, and synchronizes the time reference signal to the vehicle-mounted time synchronization auxiliary device and the various vehicle-mounted systems to be synchronized.

[0088] The key points of the method proposed in the present invention are as follows:

[0089] (1) The composition of the Beidou-based high-speed train time synchronization reference system is introduced in detail, the time synchronization method of the Beidou-based high-speed train time synchronization system is clarified, and the time synchronization technical scheme between the various systems of the train and the ground is designed. This provides new design guidance for the time synchronization of various on-board systems in high-speed trains, provides effective technical support for achieving high-precision time synchronization, and ensures the safe operation of high-speed trains.

[0090] (2) The functions and roles of each component in the Beidou-based high-speed train time synchronization reference system are clarified, and the reasonable division of each component is achieved, ensuring the effective coordination between the components, enhancing the flexibility and scalability of the system, and improving the performance and reliability of the entire system, which is crucial to ensuring the safe and on-time operation of trains.

[0091] (3) A deployment method for the Beidou-based high-speed train time synchronization reference system was proposed, and a time synchronization network between the train and the ground was constructed. This ensured high-precision and high-reliability synchronization of time signals between various systems in the high-speed train and between the train and the ground. It provided high-precision time synchronization services for various systems in the train, laid a solid foundation for the accuracy and safety of the time synchronization of the entire train, and provided a strong guarantee for the long-term stable operation of the train.

[0092] (4) In combination with the different operating conditions and installation methods of trains, the various deployment methods of the on-board devices in the Beidou-based high-speed train time synchronization reference system in high-speed trains are clarified, which enables the flexible deployment of the system's on-board devices in the train and reduces the impact of the system's deployment on the existing on-board systems, thereby providing a stable and reliable time reference for high-speed trains.

[0093] (5) The design of the on-board device in the Beidou-based high-speed train time synchronization reference system was proposed, which clarified the functions and roles of each module in the device, reduced the complexity and maintenance cost of the on-board device, improved the reliability of the system, enhanced the standardization and compatibility of the system, made the system easier to manage and upgrade, and enabled the system to be quickly adjusted and upgraded according to different application requirements and environmental conditions, thus providing a stable and reliable time reference for high-speed trains.

[0094] (6) The time synchronization output interface of the Beidou-based high-speed train time synchronization system is clarified, which is compatible with the interfaces of different systems of existing vehicles and adopts a standardized time synchronization protocol, which improves the scalability and flexibility of the system and ensures the consistency of time of each system. (7) The time synchronization process of the Beidou-based high-speed train time synchronization system is clarified, which provides an implementation basis for the construction of the Beidou-based high-speed train time synchronization system, provides a precise and reliable time synchronization mechanism for high-speed trains, and ensures the time consistency of high-speed trains during operation.

[0095] In summary, the advantages of the method and system proposed in the present invention are: (1) A high-speed train time synchronization reference system based on Beidou is proposed, and the system consists of four components, namely, a vehicle-mounted time synchronization reference device, a vehicle-mounted time synchronization auxiliary device, a ground time synchronization reference station and a mobile time calibration source, and the functions and roles of each component are clarified; (2) A time synchronization method for a high-speed train time synchronization system based on Beidou is proposed, and a technical solution for time synchronization between various systems of the train and between the train and the ground is proposed; (3) A deployment method for a high-speed train time synchronization reference system based on Beidou is proposed, a time synchronization network between the train and the ground is constructed, and the connection method and role of each component in the time synchronization network are clarified; (4) Various deployment methods of the vehicle-mounted devices in the high-speed train in the Beidou-based high-speed train time synchronization reference system are clarified, realizing the flexible deployment of the system's vehicle-mounted devices in the train. ;(5) The module structure of the on-board time synchronization reference device in the Beidou-based high-speed train time synchronization reference system is proposed, which mainly consists of 9 modules, namely: anti-interference module, synchronous satellite time module, time calibration module, remote synchronization module, management and control module, time source arbitration and compensation module, time synchronization interface module, time taming module and punctuality module, and the function and role of each module are clarified;(6) The module structure of the on-board time synchronization auxiliary device in the Beidou-based high-speed train time synchronization reference system is proposed, which mainly consists of 6 modules, namely: reference synchronization module, time correction module, parameter management module, control module, signal forwarding module and synchronization signal output module;(7) The time synchronization process of the Beidou-based high-speed train time synchronization system is proposed, and the specific time synchronization process in the train is clarified, providing a precise and reliable time synchronization mechanism for high-speed trains.

[0096] See also Figure 8 The computer device 00 includes: a processor 01, a memory 02, and a computer program stored in the memory 02 and executable on the processor 01. When the processor 01 executes the computer program, the human factor data server access control method provided in the above method embodiment is implemented.

[0097] Among them, the processor 01 is connected to the memory 02, such as through a bus 03. The processor 01 can be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It can implement or execute various exemplary logic blocks, modules and circuits described in combination with the contents disclosed in this application. The processor 01 can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of DSP and microprocessors, etc. The bus 03 may include a path to transmit information between the above components. The bus 03 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus 130 can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 Only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus. The memory 02 is used to store a computer program corresponding to the human factor data server access control method of the above embodiment of the present application, and the computer program is controlled and executed by the processor 01. The processor 01 is used to execute the computer program stored in the memory 02 to implement the content shown in the above method embodiment.

[0098] Corresponding to the above method, the present invention also provides a computer-readable storage medium, on which a computer program / instruction is stored, and when the computer program / instruction is executed by a processor, the steps of the method described in any one of the above embodiments are implemented. The computer-readable storage medium can be a tangible storage medium, such as a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a floppy disk, a hard disk, a removable storage disk, a CD-ROM, or any other form of storage medium known in the technical field.

[0099] Corresponding to the above method, the present invention also provides a computer program product, including a computer program / instruction, which implements the steps of the method described in any one of the above embodiments when executed by a processor.

[0100] It should be understood by those skilled in the art that the exemplary components, systems and methods described in conjunction with the embodiments disclosed herein can be implemented in hardware, software or a combination of the two. Whether it is performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present invention are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link via a data signal carried in a carrier.

[0101] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention.

[0102] In the present invention, features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or combined with features of other embodiments or replace features of other embodiments.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A Beidou-based high-speed train time synchronization method, characterized in that: include: The vehicle-mounted time synchronization reference device obtains Beidou satellite time by receiving Beidou satellite signals, and the Beidou satellite time is used as the first time source; The vehicle-mounted time synchronization reference device receives the time signal of the ground time synchronization reference device by remote synchronization to obtain the ground time, and the ground time is used as the second time source; The vehicle-mounted time synchronization reference device receives a calibration compensation from a mobile time calibration source; The vehicle-mounted time synchronization reference device extracts and analyzes the time series features of the validity of the time source according to a preset arbitration model, dynamically sets weights for different time sources, and calculates the time reference signal based on the dynamically set weights. The time reference signal is used for time synchronization in the vehicle-mounted system.

2. The high-speed train time synchronization method according to claim 1, characterized in that: The vehicle-mounted time synchronization reference device also includes an anti-interference module, and the method further includes: using the anti-interference module to pre-process and optimize the received Beidou satellite time and ground time.

3. The high-speed train time synchronization method according to claim 1, characterized in that: The vehicle-mounted time synchronization reference device further comprises a time taming module, and the method further comprises: using the time taming module to adjust the clock frequency of the vehicle-mounted time synchronization reference device based on a taming algorithm, and continuously monitoring and correcting the existing clock deviation.

4. The high-speed train time synchronization method according to claim 1, characterized in that: The vehicle-mounted time synchronization reference device further comprises a timekeeping module, and the method further comprises: utilizing the timekeeping module to maintain the vehicle-mounted time synchronization reference device to continue to output an accurate time synchronization signal in the absence of a time source.

5. The high-speed train time synchronization method according to claim 1, characterized in that: The vehicle-mounted time synchronization reference device also includes a management control module, and the method further includes: using the management control module to implement functions including configuration management, status monitoring, fault diagnosis, data storage and log recording.

6. The high-speed train time synchronization method according to claim 1, characterized in that: The vehicle-mounted system includes a vehicle-mounted time synchronization reference device and multiple vehicle-mounted time synchronization auxiliary devices. The time reference signal is used for time synchronization in the vehicle-mounted system, including: the time synchronization reference device synchronizes the time reference signal to the vehicle-mounted time synchronization auxiliary device, and the vehicle-mounted time synchronization auxiliary device synchronizes the time reference signal to other vehicle-mounted time synchronization auxiliary devices.

7. The high-speed train time synchronization method according to claim 1, characterized in that: The vehicle-mounted time synchronization auxiliary device further comprises a time correction module, and the method further comprises: using the time correction module to correct the time error of the vehicle-mounted time synchronization reference device to overcome the time error that may be caused by clock drift or transmission delay.

8. A Beidou-based high-speed train time synchronization system, characterized in that: Include: The vehicle-mounted time synchronization reference device includes a synchronous satellite time module, a remote synchronization module, and a time source arbitration and compensation module; wherein, The synchronous satellite time module is used to obtain Beidou satellite time by receiving Beidou satellite signals, and receive calibration compensation from a mobile time calibration source, wherein the Beidou satellite time is used as a first time source; The remote synchronization module is used to receive the time signal of the ground time synchronization reference device through remote synchronization to obtain the ground time, and the ground time is used as the second time source; The time source arbitration and compensation module is used to extract and analyze the time series features of the validity of the time source according to a preset arbitration model, dynamically set weights for different time sources, and calculate the time reference signal based on the dynamically set weights. The time reference signal is used for time synchronization in the vehicle system.

9. The high-speed train time synchronization system according to claim 8, characterized in that: The vehicle-mounted time synchronization reference device also includes an anti-interference module, a time taming module, a time keeping module, and a management control module; The vehicle-mounted time synchronization auxiliary device comprises a reference synchronization module, a parameter management module, a control module, a signal forwarding module, a synchronization signal output module and a time correction module.

10. According to the high-speed train time synchronization system of claim 8, the high-speed train time synchronization system also includes a ground time synchronization reference device and a mobile time standard source, the ground time synchronization reference device is used to generate ground time, and the mobile time standard source is used to generate calibration compensation.

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