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A CKF based GNSS/INS train integrated positioning method

A CKF based GNSS/INS train integrated positioning method

引用

International Conference on Mechatronics and automation

作者： Liu, Jiang Cai, Bai-Gen Tang, Tao Wang, Jian State Key Laboratory of Rail Traffic Control and Safety School of Electronics and Information Engineering Beijing Jiaotong University Beijing 100044 China School of Electronic and Information Engineering Beijing Jiaotong University Beijing 100044 China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781424451418

Train positioning with high precision and integrity is crucial to train control system. For conventional positioning methods in multi-sensor integration frame could not meet the performance requirements, a GNSS/INS integrated positioning system architecture is built, in which the cubature Kalman filter is analyzed and employed to solve the problem of nonlinearity and computation efficiency, and the integrity design is realized by the principal component analysis based fault detection and diagnosis. Validation with practical measurement and results of simulation demonstrate that the CKF approach earns a high accuracy and efficiency ability than traditional UKF and PF solutions, and the integrity performance of the train positioning system could be improved by the PCA based FDD strategies. © 2010 IEEE.

关键词： Principal component analysis

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Research and application on MBT and TTCN-3 based automatic testing approach

Research and application on MBT and TTCN-3 based automatic t...

引用

International Conference on Computer Application and System Modeling

作者： Zhao, Xianqiong Zheng, Wei State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China School of Electrical and Information Engineering Beijing Jiaotong University Beijing China

ISBN: (纸本)9781424472369

Combining the advantages of model-based testing (MBT) method in the testing-automation field, as well as the advantages of TTCN-3 testing language in the field of the message-based black box testing, this paper presents a automatic testing approach of distributed real-time System based on the MBT and TTCN-3. Under the premise of considering the complexity and the real-time features of the distributed real-time system, this method first decomposed the distributed real-time system into multiple entities;for each entity, using an extended time Input/Output Automata-Labeled-ports TIOA(LpTIOA) to describe the entity according to its functional requirement specification;then derive the test case set based on an improved search algorithm;and then transfer these test cases into TTCN-3 language described test cases according to the seven regulation presented in this paper;finally achieved the TTCN-3 test platform and complete some functional tests on the CTCS-3 Level Onboard subsystem. © 2010 IEEE.

关键词： Interactive computer systems

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Load-balanced data aggregation tree construction for large scale cluster monitoring system

Load-balanced data aggregation tree construction for large s...

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2010 International Conference on Information, Networking and automation, ICINA 2010

作者： Xiao, Yuqian Zhu, Mingfa Xiao, Limin Ruan, Li School of Computer Science and Engineering Beihang University Beijing 100191 China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781424481057

The cluster monitoring system observes the operation of the system, analyzes the performance data, and displays results. It is crucial for cluster management and performance measurements as the monitoring data can be used to diagnose problems and to suggest remedies by both end users and system administrators. Scalable resource monitoring is essential to the cluster management. This paper proposes a scalable cluster monitoring architecture that builds a structured data aggregation tree(DAT) of master monitoring nodes by using the Chord P2P algorithm. The DAT leverages the Chord topology and routing mechanisms and it is implicitly constructed from native Chord routing paths without previous monitoring nodes membership and topology configuration. To balance the storage space used by monitoring data and computing load of the monitoring node, we propose a balanced routing algorithm that dynamically selects the parent of a node from its finger nodes by its distance to the root. We have evaluated the performance and scalability of our DAT-based monitoring system with up to 2500 nodes in a simulated environment. Our experiments results show that the balanced DAT scheme monitoring system scales well to a large number of nodes. Without explicitly configuring parent-child relationship, it is well adaptive to node arrival and departure and can be easily deployed. © 2010 IEEE.

关键词： Digital storage

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Research on highway ramp control based on cellular automata

Research on highway ramp control based on cellular automata

引用

International Conference on Mechatronics and automation

作者： Gou, Chen-Xi Cai, Bai-Gen Wei, ShangGuan State Key Laboratory of Rail Traffic Control and Safety School of Electronic and Information Engineering Beijing Jiaotong University Beijing 100044 China School of Electronic and Information Engineering Beijing Jiaotong University Beijing China

ISBN: (纸本)9781424451418

As we all know, freeway solves the problem about the lack of the transportation resources in home and then contributes to the development in economy. However, as economy developed fast, the growing number of motor, together with people's favor to choose freeway, makes freeway full of motor, chaos and congestion. On-ramp control is one of the efficient ways to regulate the flow of traffic entering the freeway and reduce the congestion on freeway. Based on ramp control in freeway and simulation and modeling, which is discussed in home and abroad, this essay used the micro-model, Cellular Automata traffic model (CA) in on-ramp transportation modeling, hoping that the freeway on-ramp transportation model could describe the character of the real on-ramp transportation in freeway;according to the long waiting-queue problem on the on-ramp, signal control system is applied with two different control methods, set-time signal timing method and dynamic signal timing method;based on the simulation results, conclusion is obtained. © 2010 IEEE.

关键词： Cellular automata

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Electromagnetic compatibility design of multi-sensor based train integrated positioning system

Electromagnetic compatibility design of multi-sensor based t...

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International Conference on Electromagnetics in Advanced Applications (ICEAA)

作者： Wang, Jian Cai, Bai-Gen Liu, Jiang Shangguan, Wei State Key Laboratory of Rail Traffic Control and Safety School of Electronic and Information Engineering Beijing Jiaotong University Beijing 100044 China School of Electronic and Information Engineering Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781424473687

With the rapid development of the intelligence and complication to railway systems, there are increasing demands of electromagnetic compatibility performance for train borne system, where the electromagnetic compatibility performance of train positioning system (TPS) is crucial to the design process of the entire system. In this paper, the system architecture of TPS integrating multi sensors is introduced, based on the overall design of the multi-sensor based train integrated positioning system, the electromagnetic interference of the TPS is analyzed at the power module, communication module, transmission and PCB routing, then the electromagnetic compatibility solutions are introduced in hardware and software. Lab test of the TPS validates the performance with proposed strategies. ©2010 IEEE.

关键词： Electromagnetic compatibility

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Fault estimation of large scale wind turbine systems

Fault estimation of large scale wind turbine systems

引用

作者： Wei, Xiukun Liu, Lihua State Key Laboratory for Rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 China Traffic and Transportation School Beijing Jiaotong University Beijing 100044 China Institute of Automation Beijing Information Science and Technology University Beijing 100192 China

ISBN: (纸本)9787894631046

Fault diagnosis of large scale wind turbine systems has received much attention in the recent years. Effective fault prediction would allow for scheduled maintenance and for avoiding catastrophic failures. Thus the availability of wind turbines can be enhanced and the cost for maintenance can be reduced. In this paper, we consider the sensor and actuator fault detection issue for large scale wind turbine systems where the individual pitch control is used for loads reduction. The faults considered in the paper are mainly the blade root bending moment sensor faults and blade pitch actuator faults. With the aid of a dynamical model of the wind turbine system, A dynamic filter, which is designed based on GKYP lemma in the finite frequency domain, is used to estimate the fault magnitude. The effectiveness of the proposed approach is demonstrated by simulation results for several fault scenarios.

关键词： Wind turbines

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A cubic spline curve based track map generation method for train control

A cubic spline curve based track map generation method for t...

引用

International Conference on Mechatronics and automation

作者： Wang, Jun Cai, Bai-Gen Wang, Jian Wei, ShangGuan State Key Laboratory of Rail Traffic Control and Safety School of Electronic and Information Engineering Beijing Jiaotong University Beijing 100044 China School of Electronic and Information Engineering Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781424451418

With high accuracy and storage efficiency, digital track map plays an important role in train positioning system as a special sensor, and directly affects the safety of the train operation control. In this paper, the characteristics of the track are analyzed with practical measurements, a distance discrimination is utilized to reject abnormal data, and a vertical distance criterion and cubic spline curve based algorithm is presented to reduct numerous measurement data and fit the track. By using the distance criterion and vertical distance based local optimum algorithm, a group of feature points are generated to represent the feature of rail tracks. Then the well-fitting cubic spline algorithm is employed to fit the tracks with high precision and optimize the feature point set, and then the smooth tracks could be realized by segmental cubic curves. Validation with practical measurements from Qinghai-Tibet line demonstrate that with a proper limited error of the vertical distance the proposed algorithm could realize data reduction and map generation effectively. © 2010 IEEE.

关键词： Curve fitting

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The Universal Interoperability Platform for Distributed Information Systems

The Universal Interoperability Platform for Distributed Info...

引用

The 8th World Congress on Intelligent control and automation(第八届智能控制与自动化世界大会 WCICA 2010)

作者： Yanhui Wang Chenchen Zhang Xuemei Xiao Yuan Ling State Key Laboratory of Rail Traffic Control and Safety School of Traffic and Transportation Beijing Jiaotong University Beijing，100044，China

With the development of information technology, ‘Information Island’ has become an obstacle to information resources sharing cross domains. In this paper, a universal interoperability platform for distributed information systems is built as the carrier for interoperability behavior of distributed information systems. Firstly, the logical structure of interoperability platform is described from the aspects of function module and module interactions. Then, the physical structure of the interoperability platform is discussed. Last, from the application level, the product of interoperability platform is described.

关键词： Distributed information systems Security Distributed databases Information processing Semantics Software

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Optimization model for railway freight station layout based on agent

Optimization model for railway freight station layout based ...

引用

International Conference on Computational Aspects of Social Networks, CASON

作者： Du, Yan Ping Jia, Limin Zhao, Yunyun Qin, Yong Rail Traffic Control and Safety State Key Laboratory Beijing Jiaotong University Beijing 100044 China School of Mechanical and Electronic Engineering Taiyuan University of Science and Technology Taiyuan 030024 China School of Electronic-Information Engineering Taiyuan University of Science and Technology Taiyuan 030024 China

ISBN: (纸本)9780769542027

An optimization model of China railway freight station layout based on agent and human-element-model has been put forward to solve the problems that have hindered the normal product, such as too many railway freight stations and too clear distance between stations, and so on. The model uses the classical Sugarscape as the reference and integrates the intelligence of Agent and the combination of subjectivity and objectivity of Human-element. The owners are regarded as autonomic Agents and the freight stations are regarded as resources in the model. The Agent energy can change during it seeks the resources, and its value is decided by its own energy. According to the set rules, a freight station layout in a definite scope is obtained through stimulation analysis, and the existing processes of different owner are analyzed. The simulation results show that the model has the characteristics of intelligence and autonomy, and it is meaningful to optimize the freight station layout and set the strategic cargo-loading and logistics strategy. © 2010 IEEE.

关键词： Optimization

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Design of a VoIP Media Stream Encryption Device

Design of a VoIP Media Stream Encryption Device

引用

International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Meng Xiao Cuiran Li School of Automation & Electrical Engineering Lanzhou Jiaotong University Lanzhou China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China

The design of a VoIP media stream encryption device based on ARM9 CPU is introduced. The device can be deployed between the Soft Switch or IP-PBX and the VoIP terminal, dedicatedly used for the encryption/de-encryption of the VoIP signal and the RTP voice packet. As an illustration, the encryption flow of the packet is described when the VoIP protocol is SIP and the encryption algorithm is RC4. Then a test is implemented to compare the packet before the encryption and after that, the effectiveness of the design is proved.

关键词： Encryption Algorithm design and analysis Production facilities Switches Loading

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