• Research on Test Scene of Large-number Turnout for High Speed Railway Train Control System
• Gao Xinjun, Wang Wentao, Zhou Yongjian, He Leiqiang, Niu Qin
• 2021 Vol. 18 (4): 1-4. DOI:10.3969/j.issn.1673-4440.2021.04.001
• Abstract ( ) PDF (1114KB)( )
• According to the current design specification of large-number turnout for train control system and the control logic of onboard system, this paper breaks through the traditional test content and adds the large-number turnout test scene.
• 

• Research on Demand and Method of Comprehensive Monitoring of Switch Machine
• Baocai Rangtai, Mo Chongming, Zhai Wenge, Ding Zhaorong
• 2021 Vol. 18 (4): 5-10. DOI:10.3969/j.issn.1673-4440.2021.04.002
• Abstract ( ) PDF (1340KB)( )
• Due to the particularity of switch equipment, it is difficult to obtain real-time operation parameters, which restricts the development of maintenance mode of switch equipment. Based on the existing sensor technology and switch machine monitoring requirements, combined with the safety and reliability requirements of the switch machine, this paper puts forward the switch machine moni-toring items that can be implemented at this stage, and takes ZDJ9 switch machine as an example for implementation. The measured parameters can be used as the basic data for subsequent processing, and can be used for fault prediction and health diagnosis of switch machine.
• 

• Distance-based Line Data Processing Algorithm
• Yu Wenbin
• 2021 Vol. 18 (4): 17-23,34. DOI:10.3969/j.issn.1673-4440.2021.04.004
• Abstract ( ) PDF (1904KB)( )
• This paper presents a distance-based algorithm for site data processing based on long-chain hashing algorithm by analyzing the difference of railway signal products such as TCC, RBC and TSRS software for railway line data processing. It not only makes the line data configuration flexible and unified by providing data configuration users with an interface to define their own configuration rules, but also makes development users get points comparison, scope judgment, distance calculation of line data without in consideration to line data configuration rules by providing the calculation interface of relative and absolute distance of any point on the railway line, so as to solve the problem that the current line data processing logic cannot be universal due to the different line data configuration rules of various products. The paper also puts forward further prospects and plans for the subsequent application of this algorithm in line data processing.
• 

• Research on Liaison between Yards and Train Control System in Interconnection of High-speed and Conventional Speed Railway
• Zhou Hailong
• 2021 Vol. 18 (4): 24-28. DOI:10.3969/j.issn.1673-4440.2021.04.005
• Abstract ( ) PDF (1082KB)( )
• Taking Hohhot East Station (including yards of both high-speed railway and conventional railway) of Zhangjiakou-Hohhot railway as an example, the paper analyzes the optimal scheme for setting the interlocking and train control systems for the conventional railway, and presents the scheme of setting signals for the liaison line between yards of the high-speed railway and conventional railway according to the length of the liaison line. When the line is too short to set a signal, crossover turnouts will be controlled with double-working switches in conventional yards, meanwhile, the train receiving/departure routes through the turnouts in reverse position will be set in two interlocking sections separately. When the liaison line is long, it needs to be considered in combination with factors such as safety, convenient operation, and investment saving. This article recommends the scheme of setting up a virtual train signal at the liaison line. When handling the train receiving-departure route, sectional route handling is also needed in the two interlocking areas.The recommended scheme can meet the operation requirements of receiving-departure trains and EMUs between high-speed and conventional yards.
• 

• Thoughts on Construction of Effective Training Methods for ZPW-2000A Track Circuit for Passenger Dedicated Line
• Li Yuqian
• 2021 Vol. 18 (4): 29-34. DOI:10.3969/j.issn.1673-4440.2021.04.006
• Abstract ( ) PDF (3292KB)( )
• ZPW-2000A track circuit system of passenger dedicated line is widely used in high-speed railways, and is one of the core basic signalling equipment. The whole transmission channel laid on site is long, and is divided into indoor signalling equipment and outdoor trackside equipment. There are many different kinds of equipment; especially the parameters of outdoor cable lines and rail lines are greatly affected by the surrounding environment, so it is difficult to be familiar with the whole track circuit system in a short time. In view of the current situation that there is no ZPW-2000A track circuit training system close to the actual field application, this paper puts forward a set of practical training processes and methods with strong implementation, which provides a reference for the field front-line maintenance units to further familiarize themselves with the track circuit system and improve the on-site emergency handling capacity.
• 

• Research on Performance of RaptorQ Code in Railway Broad-casting System
• Liu Yiwei
• 2021 Vol. 18 (4): 35-38,58. DOI:10.3969/j.issn.1673-4440.2021.04.007
• Abstract ( ) PDF (1393KB)( )
• Railway communication has some specific system requirements, such as high re-liability and availability, low system time delay and error rate. Embedding RaptorQ code in the railway broadcast communication system as a FEC (forward error correction coding) method can effectively reduce the system bit error rate and maximize the use of system resources. Depending on the coding characteristics of Raptor itself, the success of decoding is only related to the amount of information received, and the loss of part of information will not affect the information on application layer..In this paper, we studied the performances of RaptorQ codes by mean of executing some simulations under different packet loss rate to obtain a 100% decoding success rate by gradually increasing the decoding overhead rate.Time Analysis of Wireless Network Slicing Based on Fountain Codes[J]. Journal of Harbin Institute of Technology, 2018, 50(11): 167-170.
  [6]马为.喷泉码译码性能分析研究[D].西安：电子科技大学，2012.
  [7]龚赟.数字喷泉码度分布优化和Raptor码译码
  算法研究[D].桂林:桂林电子科技大学，2017.
  
• 

• Design of LKJ Wireless Security Communication Device
• Tang Zilin, Xiao Lizhi, Wu Yue, Zhou Xuedong
• 2021 Vol. 18 (4): 39-42,70. DOI:10.3969/j.issn.1673-4440.2021.04.008
• Abstract ( ) PDF (1600KB)( )
• LKJ onboard data is the basis of LKJ 2000(LKJ-15) to realize train control and operation analysis. LKJ data are different with the different running lines, transportation locomotives and train operation modes. LKJ data may be tampered with, attacked and penetrated during vehicle-ground transmission and wireless data reloading using the public wireless network (4G/3G). In order to solve the current problems and difficulties of railway LKJ data reloading, improve the efficiency of data reloading and ensure the security of wireless data reloading, it is of great significance to study a LKJ wireless security communication device with network security protection  function.
• 

• Discussion on Railway Wireless Communication Equipment Layout in Valley
• Yuan Tingrui, Tao Duocheng
• 2021 Vol. 18 (4): 43-46. DOI:10.3969/j.issn.1673-4440.2021.04.009
• Abstract ( ) PDF (986KB)( )
• With the construction of railways in western China, mountainous and valleys have become the common terrains of railways in this area. Due to the special geographical environment, river valleys have placed special demands on the layout of wireless communication equipment. Combined with the Dujiangyan-Siguniangshan Rail Transit Project, this paper conducts a comparative analysis on the coverage requirements and installation schemes of the wireless communication equipment layout along the river valley, so as to provide suggestions and references for the deployment of wireless communication equipment in the river valley.
• 

• Research on Scheme of Intelligent Parking Lot for Super Large Comprehensive Transportation Hub
• Zhao Sheng
• 2021 Vol. 18 (4): 47-51. DOI:10.3969/j.issn.1673-4440.2021.04.010
• Abstract ( ) PDF (2436KB)( )
• This paper studies the realization scheme of intelligent parking lot for super large comprehensive transportation hubs, and solves many problems such as low operating efficiency of traditional parking lots, difficulties in reverse car search, low utilization rate of parking spaces, single payment method, poor safety and poor travel experience. With the comprehensive use of AI, 5G, indoor positioning and navigation, cloud computing, big data, mobile payment and other emerging technologies, through the hub integrated management platform to deeply integrate each subsystem, and receive external information such as smart city and smart transportation, to form a highly collaborative intelligent parking system. After the completion of the smart parking lot, it can effectively improve the operation efficiency of the hub, relieve parking and traffic pressure, improve service level and travel convenience, protect the safety of people's lives and property, and promote social and economic development.
• 

• Research on Decision-making of Maintenance Mode of Urban Rail Equipment Based on Hierarchical Clustering
• Zhou Maoqing, Chen Zhuo, , Zhang Ning, Zhang Bingsen
• 2021 Vol. 18 (4): 52-58. DOI:10.3969/j.issn.1673-4440.2021.04.011
• Abstract ( ) PDF (1478KB)( )
• In order to facilitate managers to formulate the targeted maintenance strategies for equipment and promote the transformation of rail transit enterprises to refined operations, five characteristics such as type of equipment failure, equipment failure impact, relative maintenance cost, failure reparability and parameter extraction are selected to build a hierarchical analysis model of urban rail equipment characteristics to calculate the equipment characteristic weights, and use hierarchical clustering method to cluster equipment according to equipment characteristics and average distance as the characteristic similarity measurement method, then according to the applicability of each maintenance method and the results of equipment clustering, a logical decision method is used to select the maintenance method for the equipment. Finally, take the Wuxi metro equipment as an example to verify the feasibility of the program.
• 

• Technological Scheme of Signalling Control System for Tram
• Yao Wenhua, Hou Xili, Jia Yunguang, Song Fengjuan
• 2021 Vol. 18 (4): 59-63. DOI:10.3969/j.issn.1673-4440.2021.04.012
• Abstract ( ) PDF (1174KB)( )
• Based on key technologies such as multi-sensor fusion positioning, autonomous train route handling, and cooperative control at crossing, a new tram signalling control system is constructed which provides an important guarantee for safe and reliable tram operation, ensures the safe and efficient operation of vehicles and people in mixed right-of-way, improves the safety and availability of the system, reduces the cost, and improves the traffic volume.
• 

• Research on New Metro Train Self-positioning and Active Protection System
• Jiang Xianjin, Fan Jianwei, Jiang Huaishen
• 2021 Vol. 18 (4): 64-70. DOI:10.3969/j.issn.1673-4440.2021.04.013
• Abstract ( ) PDF (1875KB)( )
• The paper introduces a new type self-positioning and active protection system for metro train, which adopts the inertial navigation platform which has been maturely applied in the domestic aerospace field as the main positioning means, supplemented by electronic map of lines, and performs multi-source positioning information fusion by integrated application of multi-sensors such as vision and radar to correct the integral error of inertial navigation platform time. The on-site practical trial of the new type self-positioning and active protection system for metro train in urban rail transit proves that the system can not only provide high reliability and high precision positioning information for the train control system, but also realize the train active protection.
• 

• Research on Integrated Security System for Urban Rail Transit
• Zhao Ye, Fu Baoming, Zhang Ning
• 2021 Vol. 18 (4): 71-76. DOI:10.3969/j.issn.1673-4440.2021.04.014
• Abstract ( ) PDF (1504KB)( )
• In order to solve the isolated information island of station security inspection equipment, realize the information management of security inspection equipment and deal with the on-site security inspection emergencies in time, this paper makes a comprehensive analysis from the functional design, architecture design, information platform architecture and other aspects, and puts forward the design scheme of urban rail transit security inspection integrated system. At the same time, the design scheme of security inspection integrated system is applied to engineering practice. By building security inspection local area network and security inspection information platform, the status of station security inspection equipment, security inspection personnel, security inspection events and other information are uploaded to the security inspection information platform in real time, so as to realize the information and digital management of security inspection. The construction of integrated security inspection system is helpful to improve the level of security inspection in stations and the emergency management ability of urban rail transit.
• 

• Research on Fully Automatic Train Washing Scheme of Urban Rail Transit
• Qin Xiaohu, Sun Xiaoguang
• 2021 Vol. 18 (4): 77-82. DOI:10.3969/j.issn.1673-4440.2021.04.015
• Abstract ( ) PDF (1226KB)( )
• As one of the important functions of the full automatic train operation control system, fully automatic train washing can greatly improve the efficiency of train washing and reduce the workload of subway operation and maintenance personnel. This paper studies the information interaction, interface method, communication process and the state of the train washing machine in the process of automatic washing of urban rail transit, and gives the implementation plan of the automatic washing function of urban rail transit.
• 

• Causes and Countermeasures of Train-ground Communication Failure of Thales CBTC System for Shanghai Metro
• Tang Chunyan
• 2021 Vol. 18 (4): 83-88. DOI:10.3969/j.issn.1673-4440.2021.04.016
• Abstract ( ) PDF (2189KB)( )
• Thales CBTC signalling system for Shanghai Metro is a train control system based on communication technology. It does not rely on track circuit to detect train position and transmit information to onboard equipment, but uses communication technology to exchange information through wireless base station cellular network. The wireless cellular network is arranged in overlapping mode to ensure the uninterrupted exchange of information. This paper mainly analyzes the reasons for the failure of train-ground communication in Shanghai metro CBTC system, and puts forward the corresponding solutions.
• 

• Analysis of Chinese and European Railway Standard System Differences and Foreign Railway Projects Solutions
• Yu Changhong, Wu Binghao, Liu Gang
• 2021 Vol. 18 (4): 89-99,103. DOI:10.3969/j.issn.1673-4440.2021.04.017
• Abstract ( ) PDF (1104KB)( )
• Starting from the origins of different standards in China and Europe, the paper briefly introduces the railway standards of China and Europe respectively, and analyzes the differences between them. Focusing on the standards in the field of railway communication and signalling, this paper analyzes the differences in the implementation of railway engineering projects between China and foreign countries, divides overseas railway engineering projects into four generic phases: preliminary design phase, detailed design phase, installation & commissioning phase, and test & acceptance phase, and describes the main tasks of each phase. Finally, based on the actual engineering projects, this paper analyzes the impact of the differences in the standard system on the implementation of overseas projects, and puts forward corresponding offsetting measures for the reference of overseas projects, hoping to help improve the overall management and control ability of overseas projects and support “the Belt and Road”.
• 

• Research on Train Signalling System Scheme for Existing Railway Mass Transit Operation in Chongqing Main Urban Area
• Zhou Zhihui
• 2021 Vol. 18 (4): 100-103. DOI:10.3969/j.issn.1673-4440.2021.04.018
• Abstract ( ) PDF (1322KB)( )
• Based on the research of mass transit operation of Chengdu-Chongqing railway in the main urban areas of Chongqing City, combined with operation demands and the railway line’s characteristics, this paper analyzes the differences, the adaptability and the factors to be considered for the different schemes of the railway signal system, and provides feasible ideas for the selection of signal system scheme in similar cases.
• 

• Research on Preventing and Resolving Risk of Patent Infringement in "Going Out" of Railway Communication & Signal Products
• Zhou Shiwei, Xie Zuocheng
• 2021 Vol. 18 (4): 104-108. DOI:10.3969/j.issn.1673-4440.2021.04.019
• Abstract ( ) PDF (1092KB)( )
• From the perspective of the territoriality of patent rights and the normalization of the risk of overseas patent infringement, taking the railway communication signal products as the object, this paper investigates the importance of preventing and resolving the risk of overseas patent infringement to enterprises. From the three aspects of "prevention and early warning in advance, coordinated handling in the event, and summary and promotion afterwards", different dimensions such as patent layout and application, patent early warning and response, patent invalidation and infringement litigation, this paper formulates risk prevention and resolution strategies, and builds an institutionalized, information-based, professional and full-staff overseas patent infringement risk management system to comprehensively improve the ability of overseas patent infringement risk prevention and control of enterprises.
•