Train positioning system integrating MVB system and RFID technology

Abstract

The utility model discloses a train positioning system integrating an MVB (Multifunction Vehicle Bus) system and an RFID (Radio Frequency Identification) technology. Relates to the technical field of train positioning and comprises a vehicle-mounted comprehensive positioning host, a vehicle-mounted RFID positioning receiver and a composite RFID tag. The vehicle-mounted positioning receiver is connected with the vehicle-mounted comprehensive positioning host and the train control management side; the composite RFID tags are arranged on a running line of a train and a sleeper in a garage; according to the scheme, the structure of a positioning system is improved on the basis of a traditional train positioning technology, real-time accurate positioning of a train is achieved through the train-mounted RFID positioning receiver and the composite RFID tag, and meanwhile positioning information of a train control management side is obtained; the ground intelligent operation and maintenance system obtains comprehensive positioning information points of all vehicles running on a main line through the vehicle-mounted comprehensive positioning host; meanwhile, various sensors are fused in the composite RFID tag, weather and temperature information of the absolute position of the train is achieved, and a precise data basis is provided for a ground intelligent operation and maintenance system.

Description

Technical Field

[0001] This utility model relates to the field of train positioning technology, specifically to a train positioning system that integrates MVB system and RFID technology. Background Technology

[0002] With the rapid rise of intelligent operation and maintenance technology in the urban rail transit industry, the level of intelligence required for subway vehicle operation and maintenance is becoming increasingly higher. During peak passenger flow periods, the ground intelligent operation and maintenance system needs to adjust train intervals in real time based on the real-time location information of each train on the line, thereby improving passenger transport efficiency and alleviating passenger flow pressure. Simultaneously, while the trains are running on the main line, positioning technology helps maintenance personnel quickly locate the precise position of faulty trains, greatly shortening troubleshooting time, improving maintenance efficiency, and enabling the line to return to normal operation as soon as possible.

[0003] Currently, traditional track circuit positioning technology for subway trains utilizes the electrical characteristics of the track, dividing it into multiple circuit sections, each with its own track circuit. When a train enters a circuit section, it causes a change in the electrical signal within that section, thus detecting the train's position. However, the positioning accuracy of this method depends on the track length and fails to achieve high-precision positioning. Another approach is beacon-based positioning, which distributes numerous beacons along the subway line, each storing fixed position coordinates. The train's undercarriage beacon antenna reads the data as it passes by the beacons, but this method misses positioning information in sections between beacons. Satellite-based navigation technology is unsuitable for train positioning in underground tunnels. While train control systems using ground transponders, speed sensors, and vehicle-to-ground wireless communication can achieve high-precision positioning, this method does not share positioning data with other subsystems. Furthermore, it is susceptible to track slippage due to subway line inclines, curves, and weather conditions, making it difficult to effectively support ground-based intelligent operation and maintenance systems for precise monitoring of vehicle positions.

[0004] Currently, there is no practical and effective device that can conveniently realize comprehensive train positioning information to support the positioning function of ground intelligent operation and maintenance system to realize train status monitoring. Furthermore, it is difficult for ground intelligent operation and maintenance system to obtain comprehensive positioning information points of all vehicles running on the main line. Utility Model Content

[0005] The technical problem this invention aims to solve is that currently there is no practical and effective device that can conveniently realize comprehensive train positioning information to support the positioning function of ground intelligent operation and maintenance systems for monitoring train status. Furthermore, ground intelligent operation and maintenance systems struggle to obtain comprehensive positioning information points for all vehicles operating on the main line. This invention aims to provide a train positioning system that integrates MVB system and RFID technology. Based on traditional train positioning technology, it improves the positioning system structure. The onboard integrated positioning host achieves real-time accurate positioning of the train through an onboard RFID positioning receiver and composite RFID tags. Simultaneously, the onboard integrated positioning host connects to the train control and management side to obtain positioning information from the train control and management side. The ground intelligent operation and maintenance system can obtain comprehensive positioning information points for all vehicles operating on the main line from the onboard integrated positioning host. Furthermore, the composite RFID tag integrates rain and snow monitoring sensors and temperature and humidity sensors, realizing weather and temperature information for the absolute position of the train, providing a precise data foundation for the ground intelligent operation and maintenance system.

[0006] This utility model is achieved through the following technical solution:

[0007] This solution provides a train positioning system that integrates the MVB system and RFID technology, including:

[0008] An on-board integrated positioning host is used to acquire comprehensive train positioning information, which includes: train control and management side positioning information and real-time composite train positioning information; the on-board integrated positioning host is connected to the train control and management side.

[0009] The vehicle-mounted RFID positioning receiver is used to receive the real-time positioning information of the train; the vehicle-mounted positioning receiver is connected to the vehicle-mounted integrated positioning host.

[0010] Composite RFID tags are used to collect real-time composite positioning information of trains; multiple composite RFID tags are deployed on the train's running line and on the sleepers in the depot.

[0011] A further optimized solution is that the vehicle-mounted integrated positioning host includes:

[0012] A power supply board is used to supply power to the vehicle-mounted integrated positioning host; the power supply board is connected to the train's power supply.

[0013] The CPU processing board is used to acquire the train's comprehensive positioning information.

[0014] The MVB acquisition board is used to acquire positioning information from the train control and management side; the MVB acquisition board is connected to the train control and management side via the MVB bus.

[0015] An RFID acquisition board is used to acquire real-time positioning information of the train; the RFID acquisition board is communicatively connected to a composite RFID tag; the RFID acquisition board is connected to an on-board RFID positioning receiver via an RS485 bus.

[0016] The CPU processing board, MVB acquisition board, and RFID acquisition board are connected via Ethernet communication.

[0017] A further optimized solution is that the power board also includes a first voltage conversion unit and a second voltage conversion unit;

[0018] The first voltage conversion unit converts 110V DC voltage into 12V voltage to supply the RFID acquisition board and the vehicle-mounted RFID positioning receiver; the second voltage conversion unit converts 110V DC voltage into 5V voltage.

[0019] A further optimized solution is that the vehicle-mounted RFID positioning receiver includes: a power input, an excitation antenna, and an RS485 bus interface;

[0020] The power input is connected to the first voltage conversion unit, and the RFID acquisition board is connected to the RS485 bus interface of the vehicle RFID positioning receiver via an RS485 bus.

[0021] A further optimized solution is that the composite RFID tag includes: a rain and snow monitoring sensor, a voltage regulator circuit, an analog amplifier circuit, a temperature and humidity sensor, a microcontroller, an RFID chip, a receiving antenna, and a battery;

[0022] The rain and snow monitoring sensor is connected to the microcontroller through an analog amplifier circuit, and the RFID chip and receiving antenna are both connected to the microcontroller.

[0023] The battery supplies power to the temperature and humidity sensor and the microcontroller through a voltage regulator circuit; the microcontroller communicates with the temperature and humidity sensor through an I2C bus.

[0024] A further optimized solution is that the analog amplifier circuit includes:

[0025] Resistors R1, R2, R3, R4, R5, first operational amplifier, and second operational amplifier;

[0026] One end of the resistor R1 is connected to a 1.8V power supply, and the other end is connected to the first end of the rain and snow monitoring sensor. The second end of the rain and snow monitoring sensor is grounded.

[0027] One end of resistor R2 is connected to the first terminal of the rain and snow monitoring sensor, and the other end is connected to the negative input terminal of the first operational amplifier; one end of resistor R3 is connected to the second terminal of the rain and snow monitoring sensor, and the other end is connected to the positive input terminal of the first operational amplifier; one end of resistor R4 is connected to the positive input terminal of the first operational amplifier, and the other end is grounded; one end of resistor R5 is connected to the negative input terminal of the first operational amplifier, and the other end is connected to the output terminal of the first operational amplifier.

[0028] The output of the first operational amplifier is connected to the positive input of the second operational amplifier, the negative input of the second operational amplifier is connected to its output, and the output of the second operational amplifier is connected to the microcontroller.

[0029] A further optimized solution is to provide the battery with a 3V DC voltage;

[0030] The voltage regulator circuit provides 1.8V DC voltage to the temperature and humidity sensor and the microcontroller;

[0031] A further optimization scheme is that the microcontroller is a chip with the model number MSPM0C1104, and the temperature and humidity sensor is a chip with the model number CHT8513.

[0032] A further optimization scheme is that the composite RFID tags are distributed and installed on the operating line, and are also distributed at each station of the operating line, at the beginning and end of the uphill section, downhill section, and curve section of the operating line.

[0033] A further optimized solution is that the vehicle-mounted integrated positioning host is installed in the train's electrical cabinet.

[0034] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0035] This utility model provides a train positioning system integrating MVB system and RFID technology. Based on traditional train positioning technology, it improves the positioning system structure. The onboard integrated positioning host achieves real-time accurate positioning of the train through an onboard RFID positioning receiver and a composite RFID tag. Simultaneously, the onboard integrated positioning host connects to the train control and management side to obtain positioning information from the train control and management side. The ground intelligent operation and maintenance system can obtain the comprehensive positioning information points of all vehicles running on the main line from the onboard integrated positioning host. Furthermore, the composite RFID tag integrates rain and snow monitoring sensors and temperature and humidity sensors, realizing weather and temperature information of the train's absolute position, providing a precise data foundation for the ground intelligent operation and maintenance system. Attached Figure Description

[0036] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0037] Figure 1 A schematic diagram of the structure of a train positioning system integrating MVB system and RFID technology;

[0038] Figure 2 A schematic diagram of the circuit structure of the vehicle-mounted integrated positioning host;

[0039] Figure 3 A schematic diagram of the circuit structure of a vehicle-mounted RFID positioning receiver;

[0040] Figure 4 This is a schematic diagram of the circuit structure of a composite RFID tag;

[0041] Figure 5 This is a schematic diagram of an amplifier circuit. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0043] Currently, there is no practical and effective device that can conveniently realize comprehensive train positioning information to support the positioning function of ground intelligent operation and maintenance system to realize train status monitoring. Furthermore, it is difficult for ground intelligent operation and maintenance system to obtain comprehensive positioning information points of all vehicles running on the main line. In view of this, this solution provides the following embodiments to solve the above-mentioned technical problems.

[0044] Example 1

[0045] This embodiment 1 provides a train positioning system that integrates the MVB system and RFID technology, such as Figure 1 As shown, it includes:

[0046] An on-board integrated positioning host is used to acquire comprehensive train positioning information, which includes: train control and management side positioning information and real-time composite train positioning information; the on-board integrated positioning host is connected to the train control and management side.

[0047] The vehicle-mounted RFID positioning receiver is used to receive real-time positioning information of the train; the vehicle-mounted positioning receiver is connected to the vehicle-mounted integrated positioning host; the vehicle-mounted RFID positioning receiver is located at the bottom of the driver's cab, powered by the vehicle-mounted integrated positioning host, and communicates with the vehicle-mounted integrated positioning host through a communication bus.

[0048] Composite RFID tags are used to collect real-time composite positioning information of trains; multiple composite RFID tags are deployed on the train's running line and on the sleepers in the depot.

[0049] The train positioning system is a rack-mounted 3U plug-in board design, which is easy to maintain and repair. It is installed in the electrical cabinet inside the train.

[0050] like Figure 2 As shown, the vehicle-mounted integrated positioning host includes:

[0051] A power supply board is used to supply power to the vehicle-mounted integrated positioning host; the power supply board is connected to the train's power supply.

[0052] The CPU processing board is used to acquire comprehensive train positioning information. It is an embedded processor based on the ARM architecture, featuring eight processor cores with a clock speed of up to 2.0GHz. It has onboard DDR4 memory and an mSATA industrial-grade storage card with a SATA interface, offering high data storage speeds and power-loss protection to prevent irreparable damage to data storage caused by sudden power outages. The CPU processing board also integrates a 5G communication module based on a USB 3.0 high-speed interface to meet the real-time requirements of train-to-ground wireless transmission.

[0053] The MVB acquisition board is used to acquire positioning information from the train control and management side. The MVB acquisition board connects to the train control and management side via the MVB bus. The MVB acquisition board can also access the standard train control and management system bus, using a bus monitoring method to acquire real-time positioning-related information of the train. It incorporates a high-performance microcontroller with a built-in STM32 system, connected to the train control and management system's MVB bus in an electrically isolated manner. It uses a standard MVB bus A and B redundancy configuration, conforming to the IEC61375 railway bus standard. If group A fails, it can switch to group B. The board acquires station information and travel distance from the train control and management system bus using a bus monitoring method. The MVB acquisition board converts the MVB bus data into Ethernet UDP packets and sends them to the CPU processing board via the Ethernet bus.

[0054] The RFID acquisition board is used to acquire real-time positioning information of the train. The RFID acquisition board is communicatively connected to the composite RFID tag. The RFID acquisition board is connected to the on-board RFID positioning receiver via an RS485 bus. The RFID acquisition board includes a high-performance STM32 microcontroller and a dedicated RS485 isolated communication chip to achieve highly reliable communication with the on-board positioning receiver, acquire real-time information from the ground composite RFID electronic tag, and convert the real-time acquired positioning information into Ethernet UDP packets via the microcontroller, which are then sent to the CPU processing board via the Ethernet bus.

[0055] The CPU processing board, MVB acquisition board, and RFID acquisition board are connected via Ethernet communication. The CPU processing board integrates data processing, data storage, and 5G wireless communication functions, which can meet the functions of comprehensive data processing, data storage, and forwarding to the ground intelligent operation and maintenance system.

[0056] The power board also includes a first voltage conversion unit and a second voltage conversion unit;

[0057] The first voltage conversion unit converts the 110V DC voltage from the train's standard power input into a 12V voltage to supply the RFID acquisition board and the on-board RFID positioning receiver; the second voltage conversion unit converts the 110V DC voltage into a 5V voltage. The power board has functions such as reverse insertion protection, overcurrent protection, overvoltage protection, undervoltage protection, and surge protection, and has a built-in toggle switch to realize manual power switching.

[0058] like Figure 3 As shown, the vehicle-mounted RFID positioning receiver includes: a power input, an excitation antenna, and an RS485 bus interface;

[0059] The power input is connected to the first voltage conversion unit, and the RFID acquisition board is connected to the RS485 bus interface of the vehicle-mounted RFID positioning receiver via an RS485 bus. The vehicle-mounted RFID positioning receiver adopts an integrated design and has a strong vibration resistance and protection level.

[0060] like Figure 4 As shown, the composite RFID tag includes: a rain and snow monitoring sensor, a voltage regulator circuit, an analog amplifier circuit, a temperature and humidity sensor, a microcontroller, an RFID chip, a receiving antenna, and a battery;

[0061] The rain and snow monitoring sensor is connected to the microcontroller through an analog amplifier circuit, and the RFID chip and receiving antenna are both connected to the microcontroller.

[0062] The battery supplies power to the temperature and humidity sensor and the microcontroller through a voltage regulator circuit; the microcontroller communicates with the temperature and humidity sensor through an I2C bus.

[0063] The composite RFID tag integrates temperature and humidity sensors and rain and snow sensors, which can update and store external environmental weather information in real time. It can also store additional information such as train track and absolute location.

[0064] The composite RFID tag's outer shell is made of high-strength, corrosion-resistant, and flame-retardant engineering plastic. The internal battery is a button cell, and the output DC3V voltage is regulated to DC1.8V by an LDO power supply chip to provide operating power for other circuits. The microcontroller of the composite RFID tag is an ultra-low power microprocessor of model MSPM0C1104. The RFID chip is model IMPINJMONZA X-8K. The MSPM0C1104 microprocessor transmits the collected temperature, humidity, rain and snow information to the RFID chip through the I2C interface.

[0065] like Figure 5 As shown, the analog amplifier circuit includes:

[0066] Resistors R1, R2, R3, R4, R5, first operational amplifier, and second operational amplifier;

[0067] One end of the resistor R1 is connected to a 1.8V power supply, and the other end is connected to the first end of the rain and snow monitoring sensor. The second end of the rain and snow monitoring sensor is grounded.

[0068] One end of resistor R2 is connected to the first terminal of the rain and snow monitoring sensor, and the other end is connected to the negative input terminal of the first operational amplifier; one end of resistor R3 is connected to the second terminal of the rain and snow monitoring sensor, and the other end is connected to the positive input terminal of the first operational amplifier; one end of resistor R4 is connected to the positive input terminal of the first operational amplifier, and the other end is grounded; one end of resistor R5 is connected to the negative input terminal of the first operational amplifier, and the other end is connected to the output terminal of the first operational amplifier.

[0069] The output of the first operational amplifier is connected to the positive input of the second operational amplifier, the negative input of the second operational amplifier is connected to its output, and the output of the second operational amplifier is connected to the microcontroller.

[0070] The battery provides a DC voltage of 3V;

[0071] The voltage regulator circuit provides a 1.8V DC voltage to the temperature and humidity sensor and the microcontroller. The rain and snow monitoring sensor has resistive characteristics, and the analog amplifier circuit uses a resistor voltage divider to make the rain and snow sensor output a small voltage. After being amplified by the differential operational amplifier circuit, it is then input to the analog acquisition ADC sampling interface of the microprocessor MSPM0C1104 through a voltage follower to obtain rain and snow weather information in real time.

[0072] The microcontroller is a chip with the model number MSPM0C1104, and the temperature and humidity sensor is a chip with the model number CHT8513.

[0073] The composite RFID tags are distributed along the operating line, with tags deployed at each station, and at the beginning and end of uphill, downhill, and curve sections. The number of tags between stations can be adjusted based on the distance between them. Based on the actual placement of each tag, an RFID writer writes the actual track information and absolute position information into the tags. When the onboard RFID receiver passes by, it reads the absolute position information of the tags, activating the internal sensor detection circuit to obtain real-time environmental and weather information. Each tag is also assigned a fixed number, and the information from all tags on the line is compiled into a database and stored in the storage unit of the onboard integrated positioning host. The RFID writer, composite RFID tags, onboard RFID receiver, and onboard integrated positioning host in this embodiment can all be obtained using existing technologies, which will not be elaborated upon here.

[0074] The on-board integrated positioning host is installed in the train's electrical cabinet. On the one hand, the on-board integrated positioning host acquires real-time composite positioning information (absolute position information and environmental weather information collected by composite RFID tags) from the on-board RFID positioning receiver in real time. On the other hand, it acquires positioning information from the train control and management side (train's distance to and from the station and speed information), which facilitates better support for the ground intelligent operation and maintenance system's train line monitoring and improves the train's comprehensive positioning accuracy.

[0075] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A train positioning system that fuses an MVB system and an RFID technology, characterized in that, The application relates to a train integrated positioning system, which comprises the following parts: a train integrated positioning host used for acquiring train integrated positioning information, wherein the train integrated positioning information comprises train control management side positioning information and train real-time composite positioning information; the train integrated positioning host is connected with a train control management side; a train-mounted RFID positioning receiver used for receiving train real-time positioning information; the train-mounted RFID positioning receiver is connected with the train integrated positioning host; and composite RFID tags used for collecting train real-time composite positioning information, wherein the composite RFID tags are arranged on a train running line and in a track bed. The train integrated positioning host comprises the following parts: a power board used for supplying power to the train integrated positioning host; the power board is connected with a train power supply; a CPU processing board used for acquiring train integrated positioning information; an MVB acquisition board used for acquiring train control management side positioning information; the MVB acquisition board is connected with the train control management side through an MVB bus; an RFID acquisition board used for acquiring train real-time positioning information; the RFID acquisition board is in communication connection with the composite RFID tags; the RFID acquisition board is connected with the train-mounted RFID positioning receiver through an RS485 bus; and the CPU processing board, the MVB acquisition board and the RFID acquisition board are in communication connection through an Ethernet. The power board further comprises a first voltage conversion unit and a second voltage conversion unit. The first voltage conversion unit converts 110V direct current voltage into 12V voltage to provide the RFID acquisition board and the train-mounted RFID positioning receiver; and the second voltage conversion unit converts 110V direct current voltage into 5V voltage.

2. The train positioning system fusing MVB system and RFID technology according to claim 1, characterized in that, The train-mounted RFID positioning receiver comprises a power inlet, an excitation antenna and an RS485 bus interface. The power inlet is connected with the first voltage conversion unit; and the RFID acquisition board accesses the RS485 bus interface of the train-mounted RFID positioning receiver through the RS485 bus. The composite RFID tag comprises a rain and snow monitoring sensor, a voltage stabilizing circuit, an analog amplification circuit, a temperature and humidity sensor, a single-chip microcomputer, an RFID chip, a receiving antenna and a battery. The rain and snow monitoring sensor accesses the single-chip microcomputer through the analog amplification circuit; the RFID chip and the receiving antenna are connected with the single-chip microcomputer. The battery supplies power to the temperature and humidity sensor and the single-chip microcomputer through the voltage stabilizing circuit; and the single-chip microcomputer communicates with the temperature and humidity sensor through an I2C bus. The analog amplification circuit comprises the following parts: a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a first operational amplifier and a second operational amplifier.

3. The train positioning system fusing MVB system and RFID technology according to claim 2, characterized in that, One end of the resistor R1 is connected with a 1.8V power supply, and the other end is connected with a first end of the rain and snow monitoring sensor; a second end of the rain and snow monitoring sensor is grounded. ​ 4. The train positioning system fusing MVB system and RFID technology according to claim 3, characterized in that, ​ ​ 5. The train positioning system fusing MVB system and RFID technology according to claim 1, characterized in that, ​ ​ ​ 6. The train positioning system fusing MVB system and RFID technology according to claim 5, characterized in that, ​ ​ ​ One end of the resistance R2 is connected with the first end of the rain and snow monitoring sensor, and the other end is connected with the negative input end of the first operational amplifier; one end of the resistance R3 is connected with the second end of the rain and snow monitoring sensor, and the other end is connected with the positive input end of the first operational amplifier; one end of the resistance R4 is connected with the positive input end of the first operational amplifier, and the other end is grounded; one end of the resistance R5 is connected with the negative input end of the first operational amplifier, and the other end is connected with the output end of the first operational amplifier; The output end of the first operational amplifier is connected with the positive input end of the second operational amplifier, the negative input end of the second operational amplifier is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the single-chip microcomputer.

7. The train positioning system fusing MVB system and RFID technology according to claim 6, characterized in that, The battery provides 3V direct current voltage; The voltage stabilizing circuit provides 1.8V direct current voltage to the temperature and humidity sensor and the single-chip microcomputer.

8. The train positioning system fusing MVB system and RFID technology according to claim 6, characterized in that, The single-chip microcomputer is a chip with the model of MSPM0C1104, and the temperature and humidity sensor is a chip with the model of CHT8513.

9. The train positioning system fusing MVB system and RFID technology according to claim 1, characterized in that, The composite RFID tags are distributedly installed on the running line; the composite RFID tags are arranged on each station of the running line, the head and tail of the uphill section, the downhill section and the curve section of the running line.

10. The train positioning system fusing MVB system and RFID technology according to claim 1, characterized in that, The vehicle-mounted comprehensive positioning host is installed in the electrical cabinet of the train.

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