• 제목/요약/키워드: Transponder system

검색결과 129건 처리시간 0.024초

고속 RFID Reader 시스템 개발 (Development of High-Speed RFID Reader System)

  • 신재호;홍연찬
    • 제어로봇시스템학회논문지
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    • 제13권9호
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    • pp.915-919
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    • 2007
  • This paper proposed a transponder detection method to reduce recognition time in RFID system. It's also shown that conventional procedure of communication in the system could cause a waste of time when a reader recognizes a transponder. The reduction of recognition time can be obtained by developing a circuit to detect a transponder actively. Detecting a transponder is achieved by using the voltage variation of reader antenna voltage that happens when a transponder approaches to the vicinity of magnetic field formed by the reader. By adding a comparator to the antenna receiver of a reader, the reader can perceive approach or existence of a transponder. A reader for experiment is made using the MFRC500 by Phillips that supports ISO/IEC 14443 protocol. Comparing the proposed method with the conventional methods by experiment, there are 47.5ms reduction of recognition time maximally and 12ms in average.

솔라셀과 RF송수신기를 이용한 무선인식장치 (A Wireless Identification System Using a Solar Cell and RF Transceivers)

  • 이성호
    • 센서학회지
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    • 제25권5호
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    • pp.337-343
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    • 2016
  • In this paper, we newly introduce a wireless identification system using a solar cell and RF transceivers. The reader sends interrogating signal to a transponder using LED visible light, and the transponder responds to the reader using RF signal. The transponder consists of a solar cell, an amplifier, a microprocessor, and an RF transmitter. The solar cell receives the visible light from the reader and generates current to supply electric power to the other devices in the transponder. At the same time, the solar cell detects interrogating signal in the reader light. The microprocessor senses the interrogating signal and generates a responding signal. The RF transmitter radiates the responding signal to the reader. The transponder is a passive circuit because it operates without external power. In experiments, the maximum read distance between a reader and a transponder was about 1.6 meter.

The Communication Satellite Transponder Testing by EGSE System

  • 조진호;;이성팔
    • 한국위성정보통신학회논문지
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    • 제2권2호
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    • pp.36-40
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    • 2007
  • EGSE is used to check out satellite payload during the development prior to launch. The EGSE represented in this paper is a test system for Ka band communication transponder of COMS. The EGSE consist of two subsystems as CTS subsystem and PCTS subsystem. Communication Test subsystem (CTS) performs satellite transponder RF performance testing, data analysis and trending. Most of transponder RF performances are automatically tested by the CTS subsystem. Power, Command & Telemetry subsystem (PCTS) monitor telemetry messages from the transponder and send tele-commands to satellite transponder for the configuration change. PCTS also provide simulated S/C power to the transponder during the ground validation testing. The EGSE test functions are verified by the transponder simulator testing and will be used for the flight model transponders testing.

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고속열차 위치검지를 위한 트랜스폰더 시스템 운용 주파수 연구 (A Study on Radion Frequency of the Transponder System for High-speed and High-precision Train Location Detection)

  • 안일엽;성낙명;김재호;최성찬
    • 전기학회논문지
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    • 제66권1호
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    • pp.237-242
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    • 2017
  • This paper presents development of the transponder system which provides an accurate train position, especially for supporting 400km/h high speed train. Here, we analyzed an operating frequency band of the transponder system which can be interoperable with the Eurobalise system already installed in Korea railroad as to be used for the automatic train protection (ATP). By investigating the power frequency band and its data frequency band of the transponder system, we presents the adoptable frequency band for the developed transponder system. Additionally, through the real testbed using HEMU-430X, we evaluate its performance requirement and shows interoperable operation with the Eurobalise system.

디지털방식의 위성 트랜스폰더 반송파 복원 방안 연구 (A Digital Carrier Recovery Scheme for Satellite Transponder)

  • 이윤종;최승운;김종훈
    • 한국통신학회논문지
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    • 제34권10A호
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    • pp.807-813
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    • 2009
  • 위성 트랜스폰더는 상향 링크 신호를 복원하여 신호처리를 수행 하고, 하향 링크를 통해 지상국으로 전송하기 위한 통신 시스템이다. 이때 고속 비행에 의해 발생하는 도플러 주파수 편이로 인한 주파수 추적 및 동기시스템이 필요하며, 이를 위해 아날로그 트랜스폰더 방식으로는 PLL (Phase Locked Loop)을 사용하여 수신시스템의 반송파 복원을 획득한다. 이러한 방식은 위성의 기능에 따라 PLL구조 및 Loop필터의 구조와 설계방식의 변경을 필요로 한다. 본 논문에서는 이러한 아날로그 트랜스폰더를 대체할 수 있는 디지털 방식의 반송파 복원방안을 제안하였다. 이러한 방식은 근거리통신 위성이나 심 우주용 통신 위성의 특성에 따른 회로설계 변경 없이 동일한 하드웨어 플랫폼에 소프트웨어 변경으로 최적의 동기화를 구현할 수 있다.

철도교통용 고속 트랜스폰더시스템 실차 시험 (Field Test of High-Speed Transponder System for Rail Transport)

  • 박성수;김성진;이재호
    • 전기학회논문지
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    • 제65권1호
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    • pp.208-213
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    • 2016
  • In order to detect the exact position of high-speed train, it is necessary to obtain location information from the transponder tag installed along the track. When the transponder tag receives the energizing signal from the train, it sends a telegram to the reader, which includes location information. In high-speed railway environment, this telegram can be corrupted by electromagnetic interference caused by onboard electric train power equipments or wayside devices. In order to assess the performance of transponder system under this harsh environment, we carried out field test using HEMU-430X. Field test results are briefly introduced and discussed for the evaluation of the transponder system under development.

충전전지를 사용한 Passive Transponder에서의 RF-DC 컨버터 (A study on RF-DC converter of the Passive system)

  • 김광수;김종범;김양모
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
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    • pp.112-114
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    • 1998
  • The passive system requires RF-DC converter. RF-DC converter, which is used in microwave region, is more affected by parasitic elements than used in low frequency region. So it is difficult to make the converter. RF-DC converter usually consists of resonator, shottky diode, capacitor, voltage regulator. In this study, we used the rechargeable battery instead of capacitor. If any passive transponder requires more power than general transponder, battery tech of this components is important to apply for the passive system. In this paper, passive transponder, which requires more power than general passive transponder, is presented and compared to general passive transponder.

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Passive 트랜스폰더에서의 전력변환 효율 향상을 위한 연구 (Improving power conversion efficiency of the passive transponder)

  • 김광수;이교성;김양모
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 하계학술대회 논문집 F
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    • pp.1951-1953
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    • 1998
  • In this study, we present the power conversion system of the passive transponder which is operated at 2.4GHz. First, The passive transponder which is the power conversion system is one of the passive transponder elements is presented. And then the power conversion system is analyzed and simulated.

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OPTIMIZED CONFIGURATIONS OF KA-BAND TRANSPONDER SUBSYSTEM FOR ETRI'S SATCOM SYSTEM

  • Lee Yong-Min;Lee Seong-Pal;Park Jae-Woo
    • 한국우주과학회:학술대회논문집(한국우주과학회보)
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    • 한국우주과학회 2004년도 한국우주과학회보 제13권2호
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    • pp.312-315
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    • 2004
  • In order to optimize the configurations of Ka-band transponder subsystem, the tradeoff design has been performed iterately with emphasis on the improving performances of the payload system as well as effectiveness of Satellite Communication (SATCOM) system operation. It is necessary to allocate performance to the transponder equipments and to keep providing the main services. It begins with analyzing the requirements and allocating performance parameters by establishing budgets for electrical and mechanical characteristics. In this paper, introduction of SATCOM system and finally optimized Ka-band transponder configuration that is to be used for preliminary design will be mainly presented.

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솔라셀을 이용한 가시광 인식용 수동형 트랜스폰더 (A Passive Transponder for Visible Light Identification Using a Solar Cell)

  • 이성호
    • 센서학회지
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    • 제23권4호
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    • pp.238-244
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    • 2014
  • In this paper, we introduce a new passive transponder that operates without external power in a visible light identification system. The transponder consists of a solar cell, a photodiode, a microprocessor, and a visible LED. When a reader sends light to the transponder, the solar cell generates current from the reader light and supplies power to the other elements in the transponder. At the same time, the photodiode detects the pulse in the reader light and initiates a microprocessor to generate and send a responding light to the reader. In experiments, we realized a passive transponder using a solar cell that operated at a distance of 1m without external power.