• Research on Electromagnetic Interference and Protection Technology of Balise Transmission System in Neutral Section
• Li Zhiyu
• 2022 Vol. 19 (7): 1-6. DOI:10.3969/j.issn.1673-4440.2022.07.001
• Abstract ( ) PDF (3753KB)( )
• The balise transmission system is an important part of the train operation control system, and the electromagnetic environment at its installation location is complex. In actual operation, BTM failures caused by electromagnetic interference are frequent, which poses a hidden danger to the safe operation of trains. In order to improve the electromagnetic compatibility performance of balise transmission system, this paper studies the electromagnetic interference of balise transmission system in neutral section and proposes corresponding protection scheme. Firstly, the theoretical analysis of the causes of pantograph catenary discharge in the neutral section is carried out, and the electromagnetic radiation in the uplink frequency band of BTM operating in the neutral section is measured; then the electromagnetic interference coupling law of neutral section pantograph catenary discharge to the on-board antenna of the balise transmission system is studied by modeling and simulation of the train and balise transmission system; finally, according to the characteristics of electromagnetic interference spatial coupling, the protective measures to block its energy coupling path are proposed, the CAU antenna shield is designed, its shielding effect is measured in the laboratory, and the operational test is carried out in the field. The results show that after the CAU antenna is equipped with a shield, the differential mode electromagnetic interference at 3~3.5MHz in the BTM operating frequency band can be reduced by about 20 dB, while the BTM message quality is improved from 0.83 to 0.91. This shows that the proposed shield solution can effectively improve the anti-interference performance of the CAU antenna and will not affect the normal signal transmission of the BTM, thus ensuring the normal communication technology requirements of the balise transmission system. It is expected to reduce the failure rate of the balise transmission system and has a high application value.
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• Method of Graphical Modeling Based on Signal Monitoring Equipment
• Tan Yan Fan Chunxue, Cao Yahui, Luo Xin
• 2022 Vol. 19 (7): 7-12,17. DOI:10.3969/j.issn.1673-4440.2022.07.002
• Abstract ( ) PDF (3155KB)( )
• With the release of the 2020 version of the centralized signal monitoring technical standard, higher requirements are put forward for the graphics of monitoring equipment. This paper adopts the method of graphic modeling of equipment and proposes the storage and display of the corresponding relationship based on the graphic information matrix of the signal monitoring equipment. The information of the signal equipment is stored in the graphical information matrix, and then the equipment status information is displayed in real time through 2D or 3D graphical modeling. Through the implementation of this method, the full-scale and three-dimensional display effect can be realized, providing the "degree of health" and "full life-cycle monitoring" of the signal equipment, as required by the 2020 version of monitoring standard. At the same time, more details are displayed, showing the logical combination, series/parallel connections and the relationship of mutual supervision of different signal equipment. This paper is of great guiding significance for the development of follow-up centralized signaling monitoring.
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• Research on Special Interlocking Function of BOOL Subsystem in RMU
• Jiang Shuang
• 2022 Vol. 19 (7): 13-17. DOI:10.3969/j.issn.1673-4440.2022.07.003
• Abstract ( ) PDF (1218KB)( )
• The logic processing subsystem (BOOL) of resource management system (RMU) is equivalent to the existing station interlocking. Because of the requirements of RMU's system itself and system interface, the design and implementation of related functions of BOOL subsystem are quite different from those of the existing interlocking. Based on the related functions of existing station interlocking, this paper compares and analyzes the logic of route setting and release as well as the logic of changing section direction in BOOL subsystem, and explains in detail the special requirements of BOOL subsystem.
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• Research on Upgrading of TW-2 Hump Automatic Control System
• Li Zisheng, Hu Weidong
• 2022 Vol. 19 (7): 18-22,45. DOI:10.3969/j.issn.1673-4440.2022.07.004
• Abstract ( ) PDF (1084KB)( )
• This paper briefly describes the background, objective and content of the research on the upgrading of TW-2 Hump Automatic Control System. The system structure, the database design and the software module design of the upgraded system are described in detail. An integration server is added to the system structure to enhance the data service and the interface service ability. Microsoft SQL Server is used as the database and the relational data structure is redefined. The software programs are redesigned for the user operation layer, the integration management layer, the upper control layer and the lower control layer. The humping route module serves as an example to describe the control flow of the system in detail. The upgraded system has passed the test and verification, the software functions are perfect, the human-computer interaction is friendly and the maintenance function is improved.
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• Experimental Study on Lightning Impact Characteristics of Track Circuit Equipment
• Xu Ye, Gao Bin, Li Bo, Zhou Yuqiu, Xiang Nianwen, Zhang Wei
• 2022 Vol. 19 (7): 23-29. DOI:10.3969/j.issn.1673-4440.2022.07.005
• Abstract ( ) PDF (1806KB)( )
•  In order to obtain the lightning impact characteristics of track circuit equipment under different temperature and humidity conditions, the tests of common mode and differential mode lightning response characteristics are carried out on its key equipment under different conditions. The test results show that the ambient temperature is positively correlated with the peak value of common mode and differential mode lightning responses, while the ambient humidity is negatively correlated with the peak value of differential mode lightning responses and is basically not affected by the common mode lightning impulse overvoltage of equipment.
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• MVB Simulation Method of On-board Equipment Based on Socket Communication
• Sun Erjing, Zhang Guozhen, Zhang Zhenxing
• 2022 Vol. 19 (7): 30-33. DOI:10.3969/j.issn.1673-4440.2022.07.006
• Abstract ( ) PDF (1245KB)( )
• Based on the application of MVB in on-board equipment and the analysis of MVB and Socket data transmission process, this paper proposes an MVB simulation method for on-board equipment based on Socket communication, and introduces the function design of MVB simulation method, virtual MVB software architecture and data transmission process in detail.
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• Discussion on Linkage between Train Doors and Platform Screen Doors of CTCS2 + ATO System
• Yan Wei
• 2022 Vol. 19 (7): 34-39. DOI:10.3969/j.issn.1673-4440.2022.07.007
• Abstract ( ) PDF (1189KB)( )
• This paper introduces the application of a platform screen door system in intercity railways, describes the setting of the system and platform doors and the principle of interface implementation as well as the main problems in the application based on CTCS2+ATO subsystem. This paper classifies and analyzes these problems, proposes the fault handling ideas and improvement suggestions, so as to reduce the equipment failure rate. Preventive measures and ideas are put forward to reduce interface faults in the train door and platform door system that may occur during the subsequent construction of new lines, so as to reduce the impact of the interface faults on the operation as much as possible, in order to ensure the normal operation of new line construction.
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• Application of Real Scene Holographic and Intelligent Recognition Technology in Railway Freight Yards
• Chen Gang, Xia Lei, Liang Duozi, Chen Gang, Yuan Qianfang, Ye Weichun
• 2022 Vol. 19 (7): 40-45. DOI:10.3969/j.issn.1673-4440.2022.07.008
• Abstract ( ) PDF (6448KB)( )
• This paper elaborates on the existing monitoring equipment and common problems of the current railway freight yards, and proposes the use of AR (augmented reality) technology and image intelligent recognition technology to solve the safety management and control problems of different railway freight yards. At the same time, it introduces and summarizes the effect of the application of intelligent safety management and control in the freight yards. The application and conclusions have practical significance for the intelligent management and control of railway freight yard safety in the exploratory stage, and also provide reference solutions for the development of IT-based railway freight yard safety.
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• Application of 5G in Intelligent High-speed Railways
• Chen Su, Zhao Sheng
• 2022 Vol. 19 (7): 46-50,76. DOI:10.3969/j.issn.1673-4440.2022.07.009
• Abstract ( ) PDF (2839KB)( )
• 5G has the advantages of large bandwidth, high reliability, low latency and massive connections, and has become an indispensable and important information infrastructure for intelligent high-speed railways. In this paper, the application status of GSM-R system is analyzed, and the existing problems of GSM-R system are pointed out. Then the paper analyzes the application requirements of 5G of intelligent high-speed railways, and puts forward the corresponding application mode according to the various business requirements of the intelligent high-speed railways. The fusion applications of a new generation of communication and information technology in the railway industry, marked by 5G, cloud computing, big data, artificial intelligence, and the Internet of Things, will effectively improve the quality, safety, reliability and operational management efficiency of railway transportation services.
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• Station Platform Landmark Display System Based on Wireless Communication Technology
• Li Junpeng, Shi Bizhou
• 2022 Vol. 19 (7): 51-53,101. DOI:10.3969/j.issn.1673-4440.2022.07.010
• Abstract ( ) PDF (1770KB)( )
• This paper proposes and designs a management system of landmark LED indicators installed on the floor of a station platform, so that passengers can quickly find the carriage numbers, in order to replace multiple sets of trackside signs on the current station platforms. The system is controlled wirelessly by the station dispatching system, with LEDs indicating the number of each carriage. This design can shorten the boarding time of passengers.
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• Application of Digital Optical Fiber Repeaters in Railway Communication
• Gao Jianping
• 2022 Vol. 19 (7): 54-57. DOI:10.3969/j.issn.1673-4440.2022.07.011
• Abstract ( ) PDF (1404KB)( )
• This paper introduces the composition and application characteristics of the digital optical fiber repeater system, compares the application differences between the digital optical fiber repeaters and the distributed base stations, and emphasizes the problems arising from the application of such repeaters in railways. Based on the characteristics and coverage modes of such repeaters, a solution is proposed to reduce the influence of time delay on railway communication by adjusting the setting parameters of the repeaters in a specific scenario. This paper provides a theoretical basis for setting the parameters of these repeaters in high-speed scenarios and for the security of the application of GSM-R system.
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• Research on Station-level Network Communication of Shenhua Dispatching Information System
• Yang Shu
• 2022 Vol. 19 (7): 58-62. DOI:10.3969/j.issn.1673-4440.2022.07.012
• Abstract ( ) PDF (1400KB)( )
• This paper studies the station-level network requirements of Shenhua dispatching information system in order to ensure the operation of Shenhua dispatching information service while improving the station-level network performance. Through analyzing the technical requirements of network reliability, availability and security, this paper puts forward the station-level networking scheme of Shenhua dispatching information system to meet the business demands. Meanwhile, the station-level network scheme combines with the corporate-level and center-level network schemes to establish the whole Shenhua dispatching information system, in order to ensure the long-term and stable operation of the network.
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• Research on 5G Public-Private Network Convergence Scheme for Urban Rail Transit
• Yang Qi, Feng Jingran, Zhou Min, Ge Weitao, Li Minxuan
• 2022 Vol. 19 (7): 63-69. DOI:10.3969/j.issn.1673-4440.2022.07.013
• Abstract ( ) PDF (1478KB)( )
• Based on the demands for wireless bearing services of urban rail transportation, the main wireless bearing services of urban rail are introduced and the demand for broadband wireless services for the future is envisioned. The main options to meet these demands include establishing a virtual private network by slicing and MEC and utilizing the 5G network equipment of operators; sharing 5G base stations with operators and building a small core network independently; using operators' 5G core networks and wireless networks and providing UPF and MEC independently; leasing operators' frequencies and providing a self-built network. The advantages and disadvantages of each of the scheme above are compared and analyzed.
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• Improvement of Low-Medium Speed Maglev Signal System Based on Intermittent ATC System
• Wang Guan, Yang Mingchun
• 2022 Vol. 19 (7): 70-76. DOI:10.3969/j.issn.1673-4440.2022.07.014
• Abstract ( ) PDF (1440KB)( )
• Based on the demand for operation management of Fenghuang Maglev Express  (a cultural tourism line), this paper is dedicated to improve the adaptability of intermittent ATC system to low or medium speed maglev lines. Several functions of the existing and mature intermittent ATC system are improved, including the protection against a train moving past a red light, special control telegrams of the balises, intermittent temporary speed limit, the management of passenger boarding and getting off, system structure improvement, the measurement of speed and distance and other functions. A new control system of intelligent and autonomous operation is developed by such optimization, providing high quality solutions for low or medium speed maglev signal systems.
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• Design of Integrated Service Carriers Based on EUHT in Urban Rail Transit
• Di Shiping, Lei Jun
• 2022 Vol. 19 (7): 77-82. DOI:10.3969/j.issn.1673-4440.2022.07.015
• Abstract ( ) PDF (1151KB)( )
• Based on the analysis of the requirements of integrated service carriers in urban rail transit, the characteristics of EUHT wireless communication technology are studied. It is proposed to use EUHT train-trackside wireless communication system to carry the integrated services in urban rail transit. After the engineering design, the system is deployed and put into use in Beijing Subway Capital Airport Express. The field test results show that the train-trackside wireless communication system based on EUHT can meet all the requirements of integrated service carriers in urban rail transit.
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• Analysis of Subway Passenger Profiles Based on Mobile Payment Data
• Zhang Mingzhu, Li Yu, Jiao Jingli
• 2022 Vol. 19 (7): 83-86. DOI:10.3969/j.issn.1673-4440.2022.07.016
• Abstract ( ) PDF (1195KB)( )
• In order to provide better subway operation services for passengers and to provide differentiated services for different passengers, this paper takes mobile payment data as the research object, and establishes an analysis model through data collection and processing, so as to compile consumer profiles for subways. This method provides the data support for more targeted operation management, and provides the scientific and powerful decision-making basis for operation decisions.
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• Research on Internet Ticketing Revenue Audit of Urban Rail Transit
• Zhao Daqi
• 2022 Vol. 19 (7): 87-91,120. DOI:10.3969/j.issn.1673-4440.2022.07.017
• Abstract ( ) PDF (1009KB)( )
• The Internet ticket revenue audit under the new circumstances is quite different from the original cash revenue audit. How to extract the necessary revenue data from the complex system data will become the key issue. Based on the analysis of traditional ideas of the audit of data on ticketing cash revenue and the typical ticketing scenarios in the Internet mode, this paper puts forward the hierarchical definitions of receivable and received revenues in the audit data and their data extraction methods, and completes the revenue audit through data comparison. Based on the current situation, this paper puts forward the optimization methods of Internet ticket audit, so as to improve the accuracy and efficiency of non-cash revenue audit.
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• Risk Management of Reconstruction Projects of Existing Signal Systems for Urban Rail Transit
• Liu Yuanwei
• 2022 Vol. 19 (7): 92-95. DOI:10.3969/j.issn.1673-4440.2022.07.018
• Abstract ( ) PDF (1078KB)( )
• The upgrading of signal systems is a necessity to improve the transportation efficiency and break through the limit of existing minimum operation intervals. This paper studies and evaluates the risk management of projects for upgrading the existing signal systems of urban rail transit, summarizes the risk characteristics of these projects, lists the risks and identifies 45 risk points, classifies them into six risk factors, and then analyzes each risk factor and puts forward specific countermeasures to resolve or reduce the losses of the risks.
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• Analysis of High-voltage Pulse Track Circuits Interfering with Locomotive Signals in Electrified Sections
• Liu Xi
• 2022 Vol. 19 (7): 96-101. DOI:10.3969/j.issn.1673-4440.2022.07.019
• Abstract ( ) PDF (1990KB)( )
• High-voltage pulse track circuit is one of the new track circuit systems to solve the problem of poor shunting of track circuits. After being applied in some stations, the poor shunting caused by rail surface corrosion has been improved, but in practical application, there is the problem of interference with locomotive signals. Based on the actual cases, this paper analyzes the causes and mechanism of the potential problem caused by the high-voltage pulse track circuits applied in the electrified sections, and puts forward some targeted improvements.
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• Design and Analysis of Track Vacancy Logical Detection at Railway Boundaries of QJK System
• Zhang Qi
• 2022 Vol. 19 (7): 102-106. DOI:10.3969/j.issn.1673-4440.2022.07.020
• Abstract ( ) PDF (1140KB)( )
• In the actual application process, the automatic block sections of normal speed railway lines realize the track vacancy logical detection through the integrated controlling system for sections. When a railway line crosses the railway boundaries of different railway administrations, different treatment methods are adopted due to the consideration of site conditions, cost and maintenance convenience. This paper discusses the problems in and solutions to the track vacancy logical detection at such boundaries through the integrated controlling system for sections. Based on different actual situations, different design schemes are proposed and their advantages and disadvantages are analyzed and corresponding restrictions and protective measures are proposed to ensure the safety of the automatic block sections of normal speed railway lines, which can provide reference for the selection of schemes in actual engineering projects.
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• Research on Design of High-power Filters
• Zhao Junwei
• 2022 Vol. 19 (7): 107-111. DOI:10.3969/j.issn.1673-4440.2022.07.021
• Abstract ( ) PDF (1426KB)( )
• High-power filters are widely used in onboard communication systems. The current BTM transmitter board has a mature band-pass high-power filter in the output part. The main purpose is to suppress the second and third harmonics. This paper takes the Euroloop  as an example to discuss a design research on high-power filters. The Euroloop onboard system needs to receive the CDMA (Code Division Multiple Access) signals from the trackside equipment, and also needs to ensure the normal operation of the balises. The activation signal of a balise is 27.095MHz, and the transmission output power is 20W (43dBm). These signals are transmitted in the same coaxial cable. A high-power filter is required in the RF front-end to filter out 27.095MHz signals to ensure that 13.5MHz CDMA signals are received normally, and the corresponding interference signals need to be suppressed.
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• Analysis of Train Control Center Alarm of Inconsistent State Acquisition Information and Driving Control Information Caused by Track Circuit Board
• Yu Yang
• 2022 Vol. 19 (7): 112-115. DOI:10.3969/j.issn.1673-4440.2022.07.022
• Abstract ( ) PDF (4628KB)( )
• An alarm is raised by the train control center because of the inconsistency between state acquisition information and driving control information of signals caused by the interruption of communication with ZPW-2000 track circuits. This paper analyzes this alarm by examining the design principles and technical requirements of the train control center, makes inferences and restores the failure process step by step based on the data on the maintenance terminal, determines the cause of the failure, and proposes a solution.
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• Design Optimization of Yellow-flash-yellow Circuits of Railway Hub Station Signal
• Yun Huimin, Liang Xiaobo
• 2022 Vol. 19 (7): 116-120. DOI:10.3969/j.issn.1673-4440.2022.07.023
• Abstract ( ) PDF (1294KB)( )
• In view of the situation that the length of the control cable between the home signal (or the receiving signal) and the signal tower is about 3 km in the railway hub or the special station with long throat section, the yellow-flash-yellow signal aspect is unstable or cannot be displayed normally. This paper analyzes and studies this problem from the perspective of engineering design, and puts forward the design optimization solution.
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