Railway communication and positioning system

Abstract

The invention relates to the technical field of railway communication systems, in particular to a railway communication and positioning system, which comprises a Beidou differential system for measuring an error value with spatial correlation and sending the error value to a vehicle-mounted positioning terminal through a 4G / 5G wireless communication mode; the vehicle-mounted positioning terminal obtains satellite positioning data, corrects the positioning data of the vehicle-mounted positioning terminal in combination with an error value sent by the Beidou differential system, and then sends the corrected positioning data to the ground control system; the ground control system monitors vehicle information and optimizes a vehicle operation plan according to the positioning data sent by the vehicle-mounted positioning terminal; data are transmitted among the handheld terminal, the ground control system and the vehicle-mounted host computer in a 4G / 5G wireless communication mode, and a satellite link can be established with the Beidou satellite system to obtain satellite positioning data. According to the railway communication and positioning system, real-time data transmission can be realized, and the positioning and scheduling precision is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of railway communication systems, and in particular to a railway communication and positioning system. Background Art

[0002] The existing railway station communication system usually adopts traditional TETRA or GSM-R technologies, which have problems such as low communication capacity, high latency, and inability to meet the needs of large data transmission, which will affect the real-time update and scheduling of train location information. In addition, the traditional communication infrastructure cannot provide sufficient bandwidth, resulting in communication congestion, affecting the real-time transmission and scheduling of train location data. At the same time, the existing positioning system has low accuracy and is difficult to meet the needs of refined operations. Summary of the invention

[0003] The present disclosure provides a railway communication and positioning system to solve one of the above technical deficiencies.

[0004] The railway communication and positioning system provided by the present disclosure includes:

[0005] Beidou differential system measures the error value with spatial correlation and sends the error value to the vehicle positioning terminal on the vehicle through 4G / 5G wireless communication;

[0006] The vehicle-mounted positioning terminal establishes a satellite link with the Beidou satellite system to obtain satellite positioning data, and corrects its own positioning data based on the error value sent by the Beidou differential system, and then sends the corrected positioning data to the ground control system;

[0007] Ground control system, used to monitor vehicle information and optimize vehicle operation plan based on positioning data sent by the vehicle-mounted positioning terminal;

[0008] The on-board host is installed on the vehicle and transmits data to the ground control system via 4G / 5G wireless communication;

[0009] The handheld terminal transmits data with the ground control system and vehicle-mounted host via 4G / 5G wireless communication, and can establish a satellite link with the Beidou satellite system to obtain satellite positioning data.

[0010] In some embodiments, system resources are divided into control signaling slices, intercom voice slices, video transmission slices, and other slices according to priority from high to low; system resources allocate preset fixed transmission resources to control signaling slices; high-priority slices are allowed to preempt low-priority transmission resources.

[0011] In some embodiments, the process of system slice control includes:

[0012] Allocate preset fixed transmission resources for control signaling slices;

[0013] According to the number of current virtual users accessing each slice, the transmission resources with the minimum transmission requirements for the intercom voice slice and the video transmission slice are allocated in turn, and the remaining transmission resources are allocated to other slices.

[0014] In some embodiments, when the number of virtual users of the intercom voice slice changes, it is determined whether the current transmission resources of the intercom voice slice can meet the new transmission requirements;

[0015] When the requirements are met, some transmission resources that can meet the transmission requirements of the intercom voice slice are reserved, and the remaining transmission resources are released for allocation to other slices;

[0016] When the requirement is not met, the transmission resources of other slices are occupied until the transmission resources of other slices are zero and the transmission resources of the video transmission slice are occupied.

[0017] In some embodiments, when the number of virtual users of a video transmission slice changes, determining whether the current transmission resources of the video transmission slice can meet the new transmission requirements;

[0018] When the requirements are met, some transmission resources that can meet the transmission requirements of the video transmission slice are reserved, and the remaining transmission resources are released and allocated to other slices;

[0019] When it is not satisfied, the transmission resources of other slices are occupied.

[0020] In some embodiments, two different communication modules are provided between the vehicle-mounted host and the ground control system, and data is exchanged through the 4G / 5G networks provided by two operators respectively.

[0021] In some embodiments, the handheld terminal and the vehicle-mounted host respectively send data to the ground control system through the 5G wireless communication network, including text data, voice data and video data.

[0022] In some embodiments, it also includes: a retained vehicle locator, which is arranged on the vehicle; and communicates with the Beidou differential system and the ground control system through 4G / 5G wireless communication.

[0023] In some embodiments, the onboard host is used to receive dispatch commands sent by the ground control system and send train status information to the ground control system;

[0024] The on-board host is also used to monitor the status of the vehicle's engine, braking system, and communication equipment, perform emergency braking of the train, send emergency alarm signals to the ground control system, and execute train control instructions.

[0025] In some embodiments, it also includes: a laser ranging system for monitoring the vehicle position.

[0026] The technical solution provided by the embodiment of the present disclosure adopts the Beidou differential system and the Beidou satellite system to establish a satellite link to obtain satellite positioning data, determine the error value with spatial correlation, and send the error value to the vehicle-mounted positioning terminal on the vehicle through 4G / 5G wireless communication; the vehicle-mounted positioning terminal establishes a satellite link with the Beidou satellite system to obtain satellite positioning data, and corrects its own positioning data in combination with the error value sent by the Beidou differential system, and then sends the corrected positioning data to the ground control system; the ground control system is used to monitor vehicle information and optimize vehicle operation plans according to the positioning data sent by the vehicle-mounted positioning terminal; the vehicle-mounted host is set on the vehicle, and transmits data with the ground control system through 4G / 5G wireless communication; the handheld terminal transmits data with the ground control system and the vehicle-mounted host through 4G / 5G wireless communication, and can establish a satellite link with the Beidou satellite system to obtain satellite positioning data. The above scheme adopts 4G / 5G broadband wireless communication technology, provides higher bandwidth and lower latency, ensures that the train location information can be updated and transmitted in time, and 4G / 5G technology has a higher data transmission rate, which can meet the growing station communication needs. In addition, integrating communication and positioning functions into one system reduces equipment deployment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present disclosure will be described in more detail below based on embodiments and with reference to the accompanying drawings:

[0028] Figure 1 A schematic diagram of a railway communication and positioning system provided by an embodiment of the present disclosure;

[0029] Figure 2 A schematic diagram of the architecture of a railway communication and positioning system provided by an embodiment of the present disclosure;

[0030] Figure 3 A schematic diagram of network communication between a vehicle-mounted host and a ground control system in a railway communication and positioning system provided in an embodiment of the present disclosure;

[0031] Figure 4 A schematic diagram of a vehicle-mounted positioning terminal correcting positioning data in a railway communication and positioning system provided by an embodiment of the present disclosure;

[0032] Figure 5 A schematic diagram of a laser ranging system for ranging in a railway communication and positioning system provided by an embodiment of the present disclosure;

[0033] Figure 6 A schematic diagram of allocating slice resources in a railway communication and positioning system provided in an embodiment of the present disclosure;

[0034] Figure 7A schematic diagram of data transmission between terminals in a railway communication and positioning system provided by an embodiment of the present disclosure;

[0035] Figure 8 A flowchart of allocating transmission resources to each slice in a railway communication and positioning system provided in an embodiment of the present disclosure;

[0036] Fig. 9 A flowchart of seizing resources in a railway communication and positioning system provided in an embodiment of the present disclosure.

[0037] In the drawings, the same reference numerals are used for the same components, and the drawings are not drawn to scale. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, and to fully understand and implement how the present disclosure applies technical means to solve technical problems and achieve the corresponding technical effects, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only embodiments of a part of the present disclosure, not all of the embodiments. The embodiments of the present disclosure and the various features in the embodiments can be combined with each other without conflict, and the technical solutions formed are all within the scope of protection of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present disclosure.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0040] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0041] like Figure 1 and Figure 2As shown, this embodiment provides a railway communication and positioning system, including: a Beidou differential system, a vehicle-mounted positioning terminal, a ground control system, a vehicle-mounted host, and a handheld terminal.

[0042] Among them, the Beidou differential system establishes a satellite link with the Beidou satellite system to obtain satellite positioning data, measures error values ​​with spatial correlation, and sends the error values ​​to the on-board positioning terminal on the vehicle through 4G / 5G wireless communication.

[0043] The vehicle-mounted positioning terminal establishes a satellite link with the Beidou satellite system to obtain satellite positioning data, and corrects its own positioning data based on the error value sent by the Beidou differential system, and then sends the corrected positioning data to the ground control system.

[0044] The ground control system is used to monitor vehicle information and optimize vehicle operation plans based on the positioning data sent by the on-board positioning terminal.

[0045] The on-board host is set on the vehicle and transmits data with the ground control system via 4G / 5G wireless communication.

[0046] Data is transmitted between the handheld terminal and the ground control system and the vehicle-mounted host via 4G / 5G wireless communication, and a satellite link can be established with the Beidou satellite system to obtain satellite positioning data.

[0047] The 4G / 5G broadband wireless communication network covers the entire station and carries all kinds of business data transmission, including data transmission, voice transmission and video transmission. Because the information interaction between the ground control system and the vehicle-mounted host usually includes important vehicle control information, this information needs to be transmitted stably and reliably, so link redundant transmission is designed between the ground control system and the vehicle-mounted host.

[0048] The differential base station in the Beidou differential system uses positioning equipment to measure error values ​​with spatial correlation, and sends these error values ​​in real time through the 4G / 5G broadband wireless communication system. The vehicle-mounted positioning terminal not only receives satellite navigation messages for positioning and calculation, but also receives the error values ​​sent by the differential base station through the 4G / 5G broadband wireless communication system, and corrects its own positioning data, thereby improving positioning accuracy and achieving high-precision positioning with an error of less than 1 meter. The calculated positioning results are sent to the ground control system in real time through 4G / 5G communication.

[0049] The technical solution provided in this embodiment uses the Beidou differential system to establish a satellite link with the Beidou satellite system to obtain satellite positioning data, determine the error value with spatial correlation, and send the error value to the vehicle-mounted positioning terminal on the vehicle through 4G / 5G wireless communication; the vehicle-mounted positioning terminal establishes a satellite link with the Beidou satellite system to obtain satellite positioning data, and corrects its own positioning data in combination with the error value sent by the Beidou differential system, and then sends the corrected positioning data to the ground control system; the ground control system is used to monitor vehicle information and optimize vehicle operation plans based on the positioning data sent by the vehicle-mounted positioning terminal; the vehicle-mounted host is set on the vehicle, and transmits data with the ground control system through 4G / 5G wireless communication; the handheld terminal transmits data with the ground control system and the vehicle-mounted host through 4G / 5G wireless communication, and can establish a satellite link with the Beidou satellite system to obtain satellite positioning data. The above scheme adopts 4G / 5G broadband wireless communication technology, providing higher bandwidth and lower latency, ensuring that the train location information can be updated and transmitted in time, and 4G / 5G technology has a higher data transmission rate, which can meet the growing station communication needs. In addition, integrating communication and positioning functions into one system reduces equipment deployment costs.

[0050] Based on the above technical solution, Figure 3 As shown, there are two different communication modules between the on-board host and the ground control system, which exchange data through the 4G / 5G networks provided by two operators respectively.

[0051] During normal operation, the two modules of the vehicle host and the ground control system are in hot standby mode. Information is sent through the two modules at the same time. The receiving end can receive redundant messages from the two modules of the transmitting end, and can choose the maximum ratio combining method for decoding. When one communication module in the equipment fails, the other one can transmit normally to ensure uninterrupted communication. When a certain operator network fails, the board running another operator network can also work normally. By designing link redundant transmission between the vehicle host and the ground control system, stable and reliable information transmission is ensured.

[0052] The 4G / 5G communication network covers the entire station and carries all kinds of business data transmission, including data transmission, voice transmission and video transmission. For example, handheld terminals and vehicle-mounted hosts send data to the ground control system through the 5G wireless communication network, including text data, voice data and video data.

[0053] Data transmission can be carried out by sending text messages when voice calls are inconvenient, and status can be reported through predefined shortcut keys, including text messages, picture messages, video messages and other functions.

[0054] Voice transmission can provide an efficient, convenient and feature-rich voice calling method. The intercom voice needs to be clear and accurate, conforming to the professional noise reduction design, and meeting the voice intercom needs in noisy environments, including: single call, group call, emergency call, broadcast call, forced insertion / removal, dispatch console monitoring and other functions.

[0055] Video transmission, when handling emergency cases, can transmit the on-site situation in real-time to the command center seat in the form of video stream or make a video call with the leader, so that management and dispatchers can view the on-site video images in real time, so as to make accurate command decisions based on the on-site situation, including: video single call, video group call, dispatch desk video pull-up, dispatch desk video forwarding and other functions.

[0056] The implementation process of the above Beidou differential positioning system is as follows: Figure 4 As shown in the figure, the differential base station uses the positioning equipment to measure the error values ​​with spatial correlation and sends these error values ​​in real time. The positioning terminal not only receives the satellite navigation message for positioning solution, but also receives the error value sent by the differential base station and corrects its own positioning data to improve the positioning accuracy. The positioning terminal can be a handheld terminal or a vehicle-mounted host.

[0057] Furthermore, a laser ranging system is used to monitor the vehicle position. Figure 5 As shown in the figure, the redundant transmission link between the ground control system and the vehicle-mounted host is designed based on the TOF principle of distance measurement. If the laser transmitter emits a laser beam at time t0, hits the object and reflects, and is received by the laser receiver at time t1, the measured distance D can be calculated using the following expression:

[0058]

[0059] Where C represents the speed of light.

[0060] Since the speed of light is too fast, the timer accuracy is required to be high. The measurement accuracy of 1m corresponds to the time accuracy of ns; the measurement accuracy of cm corresponds to the time accuracy of ps. Therefore, in practical applications, the phase of the signal is usually measured instead of directly measuring the time, and the time can be calculated using the phase difference:

[0061]

[0062] In the formula represents the phase difference, f m Indicates frequency.

[0063] The system uses the 4G / 5G network to achieve real-time, highly reliable, and large-capacity transmission of control commands between the system and the ground. At the same time, combined with the Beidou differential positioning and laser high-precision positioning systems, it is convenient for driving organizers to accurately locate the locomotive position in a timely and reliable manner, providing support for intelligent decision-making in shunting operations.

[0064] The architecture of the system provided in this embodiment is as follows Figure 2 As shown in the figure, it can be divided into: terminal access side, transmission side, and business processing side. The terminal accesses the core network through the 5G module and establishes a connection with the Beidou satellite through the positioning module. The business processing side accesses the core network through the 5G base station to receive information from the terminal side and transmits control information back to the terminal side.

[0065] The main functions of the ground control system are: support for 4G / 5G communication and internal dual network management functions. Responsible for the dispatching and control of trains. It ensures the safe and efficient operation of trains on the track by monitoring the train position, speed and other relevant information in real time. By adjusting the train speed and the state of the intersection, the ground control system can avoid collisions and optimize the train operation plan. The ground control system interacts with the communication system between trains to send instructions to the trains, update the operation plan, and ensure that the trains run according to the predetermined route and speed. Performance requirements of the ground control system: voice and data communication ≥1Mbps; video communication ≥10Mbps.

[0066] The functions of the handheld terminal for shunters are as follows: the handheld terminal for shunters is a portable tool for shunters to perform tasks. It allows shunters to communicate with the ground control system and other shunters in real time; it can locate shunters in real time to ensure their safety; through the application on the terminal, shunters can submit information about train status, equipment damage or other problems for timely maintenance and repair; it can record data about shunting operations, which is useful for subsequent statistical analysis; the ground control system can assign tasks to shunters through the handheld terminal for shunters, update task information or modify the train operation plan. Its performance requirements: voice and data communication ≥1Mbps; video communication ≥10Mbps; positioning error less than 1 meter, refresh rate 10Hz.

[0067] The functions of the on-board host are mainly as follows: the on-board host is responsible for establishing a communication link with the ground control system and transmitting information between the train and the system through wireless communication and other means. This includes receiving dispatching commands sent by the ground control system, sending train status information to the ground control system, and processing other communications related to train operation; monitoring the train position to ensure that the train runs according to the scheduled route and schedule; monitoring various equipment and systems on the train, including engines, braking systems, communication equipment, etc. Through real-time monitoring, the on-board host can provide information about the train status for preventive maintenance and fault diagnosis; perform emergency braking of the train, send emergency alarm signals to the ground control system, and assist in responding to emergencies to ensure the safety of the train and passengers; perform some train control functions, such as adjusting the speed of the train, stopping and starting according to the instructions of the ground control system. This allows the train to operate flexibly according to the dispatch plan and actual conditions; record various data during the train operation, including speed, position, equipment status, etc. These data can be used for post-analysis, operation efficiency evaluation and system improvement. Its performance requirements: voice data communication ≥1Mbps; video communication ≥10Mbps; positioning error less than 1 meter, refresh frequency 10Hz.

[0068] The application data flow of railway communication and positioning system is as follows Figure 6 As shown, the ground control system should include data, voice, and video servers, and use two sets of modules to form dual-channel redundant transmission with the vehicle-mounted host (including portable machine controller), and its communication types include voice, data, and video communications.

[0069] The indoor train inspection duty officer accesses 5G to conduct voice communication with the duty officer, and the indoor duty officer conducts voice and data communication with the outdoor train inspector, shunter's handheld terminal, remote control terminal and on-board host.

[0070] The outdoor train inspector's handheld terminal accesses 5G to communicate with the shunter's handheld terminal for voice and data. The shunter's handheld terminal accesses 5G to communicate with the ground control system. The remote control terminal communicates data with the ground control system through 5G, and sends control information and voice information to the on-board host through 5G. The handheld terminal can perform Beidou positioning through satellites.

[0071] The retained vehicle is equipped with a retained vehicle locator, which is a Beidou locator that communicates with the Beidou differential system and the ground control system through 4G / 5G wireless communication. Differential positioning is performed through Beidou satellites, and the positioning information is sent to the ground control system and the vehicle host through 5G. In addition, the locator should have a laser ranging system to achieve higher-precision positioning.

[0072] All 5G terminals have functions such as control signaling, intercom voice, and video transmission. Different services have different requirements for performance such as latency, throughput, and reliability. In terms of data rate requirements, video transmission has the highest rate requirement, followed by intercom voice, and finally control signaling. From the perspective of reliability, control signaling has the highest reliability requirement, followed by intercom voice and video transmission. In view of the different requirements of different types of data, this system uses network slicing to achieve differentiated management of different types of data, thereby improving resource utilization efficiency and enhancing reliability.

[0073] In this embodiment, Figure 7 As shown, system resources are divided into control signaling slices, intercom voice slices, video transmission slices, and other slices according to priority from high to low; system resources allocate preset fixed transmission resources to control signaling slices; high-priority slices are allowed to preempt low-priority transmission resources.

[0074] Control signaling is extremely important, and the system should ensure that there are idle resources for control signaling transmission at any time. Therefore, this solution allocates sufficient fixed resources to control signaling slices, and any other type of data shall not occupy the fixed resources. For intercom voice and video transmission slices, a resource collection sufficient to meet the minimum transmission requirements is first allocated. When resources are insufficient, low-priority slice resources are allowed to be preempted. When a user accesses multiple slices, one user can be regarded as multiple virtual users, and then the resource demand is determined based on the number of virtual users.

[0075] The steps of the network slicing solution are divided into the initialization of slice parameters and the preemption and release of slice resources when the number of users in each slice changes, as follows:

[0076] First, initialize the slice parameters and allocate the preset fixed transmission resource Rc for the control signaling slice (slice 1). Rc should be able to successfully transmit when all users transmit control signaling at the same time, so as to eliminate the delay caused by resource preemption when the control signaling increases. Since the amount of control signaling data is very low, even if all users transmit control signaling at the same time, it will not occupy too many system resources. Therefore, this part of resources is fixed for the control signaling slice, and any other type of data shall not occupy this fixed resource.

[0077] like Figure 8As shown, according to the number of current virtual users accessing each slice, the transmission resources R2 and R3 with the minimum transmission requirements are allocated to the intercom voice slice and the video transmission slice in turn, and then the remaining transmission resource R4 is allocated to other slices. Specifically, in order of priority, the transmission resource R2 that can meet the minimum transmission requirements is first allocated to slice 2 (intercom voice slice), and then the transmission resource R3 that can meet the minimum transmission requirements is allocated to slice 3 (video transmission slice). The remaining resource R4 is allocated to slice 4. The total transmission resource R = R c +R2+R3+R4.

[0078] Since slice 1 can meet the maximum transmission demand, the resources of slice 1 are fixed and always reserved for the control signaling slice.

[0079] like Fig. 9 As shown, when the number of virtual users of slice 2 (intercom voice slice) changes, it is determined whether the current transmission resources of slice 2 can meet the new transmission requirements.

[0080] When the conditions are met, some transmission resources that can meet the transmission requirements of slice 2 are reserved, and the remaining transmission resources are released to be allocated to slice 4.

[0081] When the requirement is not met, the transmission resources of other slices 4 are occupied until the transmission resources of other slices 4 are zero and the transmission resources of the video transmission slice 3 are occupied.

[0082] When the number of virtual users of slice 3 changes, determine whether the current transmission resources of slice 3 can meet the new transmission requirements.

[0083] When the conditions are met, some transmission resources that can meet the transmission requirements of slice 3 are reserved, and the remaining transmission resources are released to be allocated to slice 4.

[0084] If it is not satisfied, the transmission resource of slice 4 is occupied.

[0085] The processor may include, but is not limited to, one or more processors or microprocessors. Each processor may be an application specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a controller, a microcontroller, a microprocessor or other electronic components to execute the method in the above embodiments.

[0086] The computer-readable storage medium may be implemented by any type of volatile or non-volatile storage device or a combination thereof, and the computer-readable storage medium may include but is not limited to, for example, random access memory (RAM), read-only memory (ROM), flash memory, EPROM memory, EEPROM memory, registers, computer storage media (e.g., hard disk, floppy disk, solid-state drive, removable disk, CD-ROM, DVD-ROM, Blu-ray disc, etc.).

[0087] The computer-readable storage medium may also store at least one computer executable program / instruction, which may be, for example, a computer-readable instruction. The computer-readable storage medium includes, but is not limited to, for example, a volatile memory and / or a non-volatile memory. The volatile memory may include, for example, a random access memory (RAM) and / or a cache memory (cache), etc. The computer-readable storage medium may include, for example, a read-only memory (ROM), a hard disk, a flash memory, etc. For example, a non-transitory computer-readable storage medium may be connected to a computing device such as a computer, and then, when the computing device runs the computer-readable instructions stored on the computer-readable storage medium, the various methods described above may be performed.

[0088] In addition, the computer device may also include (but not limited to) a data bus, an input / output (I / O) bus, a display, and input / output devices (eg, keyboard, mouse, speaker, etc.), etc.

[0089] The processor may communicate with external devices via an I / O bus via a wired or wireless network.

[0090] In one embodiment, the at least one computer executable instruction may also be compiled into or constitute a software product / computer program product, wherein one or more computer executable instructions are executed by a processor to perform the various functions and / or method steps in the embodiments described in the present technology.

[0091] In the embodiments provided in the present disclosure, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the above-mentioned module, program segment or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0092] It should be noted that in the present disclosure, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element limited by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0093] Although the embodiments disclosed in the present disclosure are as above, the above contents are only embodiments adopted for facilitating the understanding of the present disclosure and are not intended to limit the present disclosure. Any technician in the technical field to which the present disclosure belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present disclosure, but the scope of patent protection of the present disclosure shall still be subject to the scope defined in the attached claims.

Claims

1. A railway communication and positioning system, characterized in that: include: Beidou differential system measures the error value with spatial correlation and sends the error value to the vehicle positioning terminal on the vehicle through 4G / 5G wireless communication; The vehicle-mounted positioning terminal establishes a satellite link with the Beidou satellite system to obtain satellite positioning data, and corrects its own positioning data based on the error value sent by the Beidou differential system, and then sends the corrected positioning data to the ground control system; Ground control system, used to monitor vehicle information and optimize vehicle operation plan based on positioning data sent by the vehicle-mounted positioning terminal; The on-board host is installed on the vehicle and transmits data to the ground control system via 4G / 5G wireless communication; The handheld terminal transmits data with the ground control system and vehicle-mounted host via 4G / 5G wireless communication, and can establish a satellite link with the Beidou satellite system to obtain satellite positioning data.

2. The railway communication and positioning system according to claim 1, characterized in that: System resources are divided into control signaling slices, intercom voice slices, video transmission slices, and other slices according to priority from high to low; system resources allocate preset fixed transmission resources to control signaling slices; high-priority slices are allowed to preempt low-priority transmission resources.

3. The railway communication and positioning system according to claim 2, characterized in that: The process of system slicing control includes: Allocate preset fixed transmission resources for control signaling slices; According to the number of current virtual users accessing each slice, the transmission resources with the minimum transmission requirements for the intercom voice slice and the video transmission slice are allocated in turn, and the remaining transmission resources are allocated to other slices.

4. The railway communication and positioning system according to claim 3, characterized in that: When the number of virtual users of the intercom voice slice changes, determine whether the current transmission resources of the intercom voice slice can meet the new transmission requirements; When the requirements are met, some transmission resources that can meet the transmission requirements of the intercom voice slice are reserved, and the remaining transmission resources are released for allocation to other slices; When the requirement is not met, the transmission resources of other slices are occupied until the transmission resources of other slices are zero and the transmission resources of the video transmission slice are occupied.

5. The railway communication and positioning system according to claim 4, characterized in that: When the number of virtual users of the video transmission slice changes, determine whether the current transmission resources of the video transmission slice can meet the new transmission requirements; When the requirements are met, some transmission resources that can meet the transmission requirements of the video transmission slice are reserved, and the remaining transmission resources are released and allocated to other slices; When it is not satisfied, the transmission resources of other slices are occupied.

6. The railway communication and positioning system according to claim 1, characterized in that: There are two different communication modules between the on-board host and the ground control system, which exchange data through the 4G / 5G networks provided by the two operators respectively.

7. The railway communication and positioning system according to claim 1, characterized in that: The handheld terminal and vehicle-mounted host respectively send data, including text data, voice data and video data, to the ground control system through the 5G wireless communication network.

8. The railway communication and positioning system according to claim 1, characterized in that: Also includes: The retained vehicle locator is installed on the vehicle and communicates with the Beidou differential system and the ground control system through 4G / 5G wireless communication.

9. The railway communication and positioning system according to claim 1, characterized in that: The onboard host is used to receive dispatching commands sent by the ground control system and send train status information to the ground control system; The on-board host is also used to monitor the status of the vehicle's engine, braking system, and communication equipment, perform emergency braking of the train, send emergency alarm signals to the ground control system, and execute train control instructions.

10. The railway communication and positioning system according to claim 1, characterized in that: Also includes: Laser ranging system for monitoring vehicle position.

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