• Title, Summary, Keyword: ETCS

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Data Rate Enhancement by using QPSK on Physical Layer of Korea Dedicated Short Range Communications (QPSK 변조를 통한 DSRC Data Rate 향상 방안)

  • Park, Jin-Young;Kim, Han-Kyoung;Jeon, Wang-Won
    • 한국정보통신설비학회:학술대회논문집
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    • pp.50-54
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    • 2007
  • 현재 국내에서 ITS(Intelligent Transport Systems) 통신방식으로 이 용되고 있는 DSRC 방식은 TTA(한국정보통신기술협회)의 기술표준으로서 대전시,전주시에 적용되어 BIS(Bus Information Service)에 이용되고 있고,최근 고속도로 ETCS(Electronic Toll Collection System)가 DSRC방식으로 전국고속도로 Tollgate 에서 2007년 연말에 개통될 예정이다. DSRC 방식은 2000년에 TTA(한국정보통신기술협회)에서 기술표준이 제정되어 현재 1Mbps 의 Data 용량을 가진다. DSRC 방식의 물리링크 변조방식은 ASK(Amplitude Shift Keying)로 ITS 확장 서비스 적용을 위해 변조방식을 QPSK(Quadrature Phase Shift Keying )로 개선하게 되면 이론적으로 4배의 Data Rate 향상이 이루어진다. 물리적인 RF 변조방식을 ASK에서 QPSK로 바꿔 간단히 Data Rate을 개선하게 되면 회로구현의 경제성이 향상되어 DSRC 응용 서비스가 활성화 될 것이다.

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Pattern-Based Modeling of CBTC Onboard System (Design Pattern을 이용한 CBTC 차상시스템의 모델링)

  • Lim, Jae-Shik;Han, Jae-Mun;Yang, Chan-Seok;Kim, Hyoung-Hoon;Cho, Yong-Gee
    • Proceedings of the KSR Conference
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    • pp.371-377
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    • 2008
  • A design pattern is a general reusable solution to a commonly occurring problem in software design. A design pattern is not a finished design that can be transformed directly into code. It is a description or template for how to solve a problem that can be used in many different situations. Moreover, the name of pattern itself also can be a kind of common language among developers and patterns can be easily imported to various applications demanding similar requirements. In this paper, we present models of CBTC onboard system which follows ERTMS/ETCS specifications and present patterns applied to our system.

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Functional Analysis between LTE-Railway and Public Safety-LTE (LTE 기반 철도통합망(LTE-R)과 재난통신망(PS-LTE)의 기능 분석)

  • Kim, Yong-Kyu;Yoon, Yong-Gi;Kim, Ju-Youp;Song, Yong-Soo;Choi, Sang-Won
    • Journal of the Korean Society for Railway
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    • v.20 no.1
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    • pp.20-30
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    • 2017
  • Due to the evolution of wireless communications technology, Long Term Evolution (LTE), which is a $4^{th}$ generation mobile communications system, has been adopted as a railway communications system. This LTE Railway (LTE-R) system is composed of various elemental functions, which are largely categorized into public safety and wireless communications for train control. Research on the public safety functions of railway communications have their roots in TRS based national public safety communication systems, and research on wireless communications functions for train control have their roots GSM-R, which is utilized by the ETCS in Europe. Based on these circumstances, this paper first analyzes the requirements for developing public safety technology in LTE-R, and compares those requirements with the functions of public safety LTE (PS-LTE), which is being deployed for the first time in the world by the South Korean government. Based on an analysis of the common and specific functions of LTE-R and PS-LTE, we conclude that there is little problem in integrating LTE-R and PS-LTE from the perspective of functionality. Second, this paper provides a comparison of the LTE-R requirements for the Quality of Service (QoS) with those of GSM-R utilized by the ETCS. This offers a guideline to allow LTE-R to be applied to a 500km/h train control system.

Design of Communication Protocol for Developing WISDOM(Wireless Interface Signal Control System for Dynamic and Optimal Management) (WISDOM(차세대 신호제어시스템) 개발을 위한 통신 프로토콜 설계)

  • Jung, Sung-Dae;Lee, Sang-Sun;Yoon, Young-Bum;Kim, Jong-Bok;Moon, Young-Jun
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.7 no.1
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    • pp.92-100
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    • 2008
  • The existing transportation systems is emerged as a major obstacle to solve the problems such as a traffic jam and the increasing cost for a distribution and a traffic safety. In hun, ITS targeting intellectual vehicles and transportation infrastructure like road and signals is getting more important and the standards of ITS wireless communication is also getting attention. New traffic control strategies are being developed to utilize real-time traffic information collected by detection method using ITS wireless technology. Especially, DSRC system is being expanded wit ETCS and the use of OBU is spreading. These infrastructures will have much influence on ITS industry and a profound study on the method of utilizing a present infrastructure is going on in various fields. The optimum traffic signal control system using quality real-time information through these infrastructure is under development and so is WISDOM. Accordingly, this paper proposes communication protocol utilizing DSRC to collect real-time traffic information in WISDOM.

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Study on the mutual interference of mixed mode operation between KTX and AREX train at the airport linked line (공항철도연계 구간의 고속열차(KTX)와 전동열차(AREX) 혼용운용에 따른 ATP지상설비간 상호간섭 영향에 관한 연구)

  • Kim, Su-Bong;Song, In-Kuen
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.7
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    • pp.23-30
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    • 2016
  • ccording to the airport railroad linkage facility expansion project constructing a connecting line to the airport railway and improving the signal system and Gyeongui Susaek Station, a high-speed train is able to run directly from Gyeongbu and Honam to the airport railway. According to mixed operation of high-speed Korea Train Express (KTX) and Airport Railroad Express (AREX) trains, to establish ERTMS/ETCS L1 ATP to operate the KTX train, the signaling system of the AREX train is the same as the existing ATC/ATO, but its operation became impossible because the high-speed train causes mutual interference between the "high-speed train (KTX) and AREX ground signaling equipment" and between the "AREX train and KTX (high-speed train) ATP ground equipment." Thus, it was necessary to have a supplemental technical interference analysis comparing the characteristics of the AREX beacon and the KTX balise. So, we resolve the problems of mutual interference between the "high-speed train (KTX) and AREX ground signaling equipment" and between the "AREX train and KTX (high-speed train) ATP ground equipment" with a test using an actual train, and we confirm the technical validity with three types of test module.

Electromagnetic Wave Absorber Sheet for 940 MHz Dedicated Short Range Communication Frequency Bands Using Fe Based Alloy Soft Magnetic Metal Powder (Fe-계 연자성 금속분말을 이용한 940 MHz 단거리 전용 통신 (DSRC) 대역 전파 흡수체)

  • Kim, ByeongCheol;Seo, ManCheol;Yun, Yeochun
    • Korean Journal of Materials Research
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    • v.29 no.6
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    • pp.363-370
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    • 2019
  • The recent development of information and communication technologies brings new changes to automobile traffic systems. The most typical example is the advancement of dedicated short range communication(DSRC). DSRC mainly consists of an intelligent transportation system(ITS), an electronic toll collection system(ETCS) and an advanced traveler information system(ATIS). These wireless communications often cause unnecessary electromagnetic waves, and these electromagnetic waves, in turn, cause frequent system malfunction. To solve this problem, an absorber of electromagnetic waves is suggested. In this research, various materials, such as powdered metal and iron oxides, are used to test the possibility for an effective absorption of the unnecessary electromagnetic waves. The various metal powders are made into a thin sheet form by compositing through processing. The electromagnetic characteristics(complex permittivity, complex permeability) of the fabricated sheet are measured. As a result, we achieve -6.5 dB at 940 MHz(77.6 % absorption rate) with a 1.0 mm-thickness electromagnet wave absorber, and -9.5 dB at 940 MHz(88.8 % absorption rate) with a 2.0 mm-thickness absorber.

A Study on the Safety Braking Distance in ATP System (ATP시스템의 안전제동거리에 대한 연구)

  • Kim, Min-Kyu;Kim, Min-Seok;Kim, Jong-Soo;Yun, Yu-Boem;Lee, Jong-Woo
    • Proceedings of the KSR Conference
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    • pp.132-139
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    • 2011
  • ATP(Automatic Train Protection) system in railroad signalling system is on-board signalling system which is controlled by train control information such as location and speed of trains. Safety is ensured by transmitting the train control information between on-board and wayside device in the ATP system. When an engineer disregards the speed limit on a tachometer, the train is automatically stopped by the on-board device. Recently, the studies of increasing speed of the train have been developed. Eurobalise in ERTMS/ETCS system is used in case that speed of trains is up to 500[km/h]. A study of safety braking distance is needed by increasing the speed of train in the ATP system. Train data and track data are required to calculate the safety braking distance. The train data includes formations of trains, length of trains, service brake and emergency brake etc. Also, the track data includes slope of track, curve of track, length of track, speed limit etc. In this paper, the speed profile is computed by analyzing the train and track data in the ATP system. It is demonstrated by applying to subway line 2 in Seoulmetro through the on-site test.

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The analysis of TSI procedure in the ERTMS/ETCS (ERTMS/ETCS의 TSI 절차에 관한 분석)

  • Lee, Sang-Hyeok;Kim, Min-Seok;Jung, Dae-Young;Ko, Young-Hwan;Lee, Jong-Woo
    • Proceedings of the KSR Conference
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    • pp.125-131
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    • 2011
  • TSI(Technical Specification for Interoperability) is the highest technical specification in the Europe Railway and is composed by assessment items and essential requirements included by safety, reliability, availability, health, environment protection and technical compatibility. It is used on the research and development in the next generation railway technical. Currently, TSI procedures have been asked to bid for high speed rail business in Europe and Brazil. Also, all the railway systems such as infrastructure, signaling, electric and rolling stock system corresponding with standard of TSI procedures are exported and imported. Recently, Safety Critical System which has been studied on future railway R&D business in Korea is the state of the art train control system. And it is needed for system assessment of TSI procedures before system test and operation. In this paper, basic research is performed for analyzing TSI procedures suitable for the state of the art train control system in Korean railway.

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A Study on The recognition rate of Electronic Toll Collecting System for Using RFID (RFID를 이용한 ETCS 인식률에 관한 연구)

  • Jang, Seong-Won;Park, Byeong-Ho;Park, Chan-Hong;Sung, Hyeon-Kyeong
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.615-618
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    • 2010
  • 본 논문은 900MHz 대역의 RFID를 이용하여 고속도로 자동 요금징수 시스템을 개발하고, 차량에 부착한 태그를 RFID 리더가 인식하는 효율을 높이기 위하여 최적의 태그부착위치와 안테나 설치위치에 대하여 연구하고 속도에 따른 인식률을 연구 하였다. 연구결과 RFID 리더의 높이는 170cm일 때 지표면과의 각도 $80^{\circ}$와 차량 진행 방향과 RFID 리더의 안테나 면과의 각도 $90^{\circ}$일 때 최적의 RFID 리더 설치 위치를 나타냈고, 태그의 위치는 차량 전면 유리 운전석 쪽 아래 모서리에서부터 가로 10cm와 세로 10cm에서 가장 좋게 나타났다. 차량과 RFID 리더간의 거리에 따른 차량의 속도별에 의한 인식률은 차량과 RFID 리더간의 수평 거리가 25cm 이하일 때 30km/h에서 80km/h까지 모든 경우에 100%의 인식률을 보임으로써 빠른 속도로 톨게이트를 통과하여도 충분히 인식할 수 있을 것으로 나타났다.

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A Study on the Synthesis and Refining of Isothiazoline Derivatives (Isothiazoline 유도체의 합성 및 정제에 관한 연구)

  • Sung, Ki-Chun;Kim, Ki-Jun
    • Journal of the Korean Applied Science and Technology
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    • v.14 no.2
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    • pp.93-102
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    • 1997
  • Isothiazoline derivatives is widely used to food, medical drug and industrial goods, cosmetics etcs, and it makes to restrain and to sterilize a breeding of microbe as a preservative and a sterilizing agent. It differs with the raw material of paraoxybenzoic acid derivatives or imidazolydinyl urea to be in use at present, on the efficacy and effect, and has various characteristics. This synthesis makes 3,3'-dithiodipropionic chloride to add a thionyl chloride in 3,3'-dithiodipropionic acid, and 3,3'-dithiodipropionic methyl amide makes to synthesize in a reflux reaction the mono methyl amine to 3,3'-dithiodipropionic chloride. And last synthesis becomes to make chlorination-cyclization molecule doing a reflux reaction in the temperature of $90{\sim}100^{\circ}C$ to mix excessively thionyl chloride and ethylene dichloride to 3,3'-dithiodipropionic methyl amide. The last synthesis material has got in the mixture of 5-chloro-2-methyl-4-isothiazoline-3-one and 2-methyl-4-isothiazoline-3-one, and it is so-called isothiazoline derivatives. The purification of isothiazoline derivatives makes to fuse in ethyl acetate, and makes to decolorize and to deodorize in recrystallization. This experiment has been in synthesis and purification of isothiazoline derivatives, and has tried to measure on the antisepsis and sterilization function of microbe according to pH or content change.