• Title/Summary/Keyword: RF Module

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A Study on the Implementation of Digital Radio Frequency Memory (디지털 고주파 메모리 구현에 관한 연구)

  • You, Byung-Sek;Kim, Young-Kil
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.9
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    • pp.2164-2170
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    • 2010
  • Digital Radio Frequency Memory, ( as DRFM ), is a device with the ability to restore output to the input RF signal in the required time after storing the incoming RF signals. Therefore DRFM is widely used in Jammer, EW Simulator, Target Echo Generator, and so on. This paper proposes its hardware implementation composed with the high frequency part and the digital processing part consisting of RF input/output module and local oscillator module. It is also proposed the replicated signal generation method which is consisted of the Analog-Digital conversion in the form of pulsed RF signal quantization, and FPGA to save and produce the playback signal, and RF signals to produce a Digital-Analog Conversion in the digital processing unit. This proposed scheme applied to test board and confirmed the validity of the proposed scheme through the test results obtained by the simulated input signals.

Implementation of Intelligent Measurement System of InterModulation Distorted RF Signals (지능형 누설왜곡전파신호 측정시스템 개발)

  • Kim, Dong-hyeon;Seo, Na-Hyeon;Park, Ki-Won;Rhee, Young-Chul
    • Journal of the Korean Institute of Intelligent Systems
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    • v.27 no.2
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    • pp.144-149
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    • 2017
  • In this paper, we developed an intelligent and wideband RF-receiver module to represent a high dynamic range and good linearity characteristics up to 650MHz-2700MHz frequency band. and implemented an intelligent digital-RF- distorted signal measuring system for the RF distortion (intermodulation) signals. Broadband RF-receive module was designed to represent the optimized linear parameters of the receiver to meet the low noise and wide dynamic range. The designed intelligent digital-distortion(intermodulation) signal measument system measured by applying the 1MHz IF of third intermodulation signal of DUT and Measured data was recorded by program on the PC monitor with GUI interface. By variable up to 650MHz-2700MHz measured data showed up to -127.8dBc to -138dBc of the distortion (intermodulation) signal. And developed intelligent digital- distortion signal measurement system can be used to measure intermodulation distortion signal of wireless system widely.

A Research on Development of Unified RF Module for PCS Base Station (PCS 기지국의 통합 RF 모듈 개발에 관한 연구)

  • 황선호;박준현
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.27 no.2B
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    • pp.145-150
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    • 2002
  • This paper presents an implementation methodology of unified PCS base station system which, is capable of providing PCS services for 3 PCS carriers concurrently. We have built up an unified PCS BTS using a unification module, which is consisted of a multi-channel combiner, duplexer, LNA, power divider, feeder line, and a common set of antennas. PCS unification module is featured with wide-band and high power handling capability and electrical characteristics like insertion loss, isolation have been greatly improved. It was shown that performance of the system in terms of Ec/Io and mobile receive power within the total 30MHz PCS frequency range is uniformly acceptable and measured signal quality and coverage are equivalent to that of the individual PCS base station.

Fundamental design studies of the temperature measurement system on wireless environment (무선 환경에서의 온도 측정 시스템 설계에 관한 기초 연구)

  • 차부상;정우철;류정탁;김연보
    • Proceedings of the Korea Society for Industrial Systems Conference
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    • 2004.06a
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    • pp.101-105
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    • 2004
  • 본 논문에서는 온도 센서로부터 얻어지는 데이터를 전송하고 실시간으로 처리하기 위하여 RF방식을 이용한 단 방향 데이터 전송 시스템을 설계하고 그 특성을 측정하였다. 설계된 무선 전송기능의 온도 측정 시스템은 온도센서 및 제어부, 데이터 전송용 RF module로 구성되었다. 온도 측정을 위한 센서는 AD590 전류 구동 형 전압출력 센서이며 제어부는 PIC one-chip microprocessor를 사용하였다. 또한 데이터의 무선 전송을 위해 433MHz 주파수 대역의 반 이중 RF Module을 사용하여 system을 구현하였다. 실험은 10M 이내의 실내 공간 내에서 수행되었고, 임의의 온도측정 구간에 따른 온도 변화 환경에서 3가지 경우의 (3M,5M,10M) 거리 변화를 두고 데이터를 측정 및 비교 분석하였다. 실험결과 10M 이내의 거리에서는 온도센서로부터 얻어진 데이터를 실시간으로 송수신하여 결과를 처리할 수 있었으며 이를 이용한 다중 Sensor 시스템 구현이 가능한 결과를 얻었다.

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Power Management Circuit for Solar cell Powered Wireless Sensor Nodes (태양전지를 전원으로 사용하는 무선센서 노드를 위한 전원관리회로)

  • Kang, Sung-Muk;Park, Kyung-Jin;Kim, Ho-Seong;Park, Jun-Seok
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.1925_1926
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    • 2009
  • This paper describes a novel power management circuitry for reducing the sleeping mode power dissipation. Based on the proposed power management circuitry, the sensor module can be activated by RF wake-up signal, perform designated process and deactivate itself. There is absolutely no power dissipation at the sleeping mode which takes almost time of the operation. The temperature sensor module using solar cell as energy source has been fabricated and tested. Experimental results show that the sensor module with 3300 ${\mu}$F for storage capacitor can transmits RF temperature data to a receiver at a distance of 20 m every 15 second in a normal indoor light condition and keep the capacitor voltage over 9 V. And the sensor module can operate 100 times with a single charging, that means it is possible for the sensor module to transmit every 5 minute for 8 hours without light or any other power input during the night time.

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An Intelligent Wireless Camera Surveillance System with Motion sensor and Remote Control (무선조종과 모션 센서를 이용한 지능형 무선감시카메라 구현)

  • Lee, Young-Woong;Kim, Jong-Nam
    • Proceedings of the Korea Contents Association Conference
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    • 2009.05a
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    • pp.672-676
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    • 2009
  • Recently, intelligent surveillance camera systems are needed popularly. However, current researches are focussed on improvement of a single module rather than implementation of an integrated system. In this paper, we implemented a wireless surveillance camera system which is composed of face detection, and using motion sensor. In our implementation, we used a camera module from SHARP, a pair of wireless video transmission module from ECOM, a pair of ZigBee RF wireless transmission module from ROBOBLOCK, and a motion sensor module (AMN14111) from PANASONIC. We used OpenCV library for face dection and MFC for implement software. We identified real-time operations of face detection, PTT control, and motion sensor detecton. Thus, the implemented system will be useful for the applications of remote control, human detection, and using motion sensor.

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The Design Method of TR Module Based GaN for Satellite (실용위성 적용을 위한 GaN 기반 TR모듈 설계 기법)

  • Yang, Ho-Jun;Lee, Yu-ri;Cho, Seongmin;Yu, Kyungdeok;Kim, Jong-Pil
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.50 no.1
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    • pp.31-38
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    • 2022
  • TR module using in satellite must consider discriminative electrical and mechanical requirements compare to the one using in ground and aircraft system since not only the environment level of vibration and shock during the launch stage but also the level of radiation, vacuum and thermal variation from orbit environment are more severe than atmosphere condition. This paper describes the environmental conditions of launch and the orbit and, suggests design method of TR module applying GaN to satisfy the unique environmental requirements of satellite systems by especially focusing on parts selection, derating design, RF budget design, manufacturing process design, and thermal design of TR module.

Design of the Dual Receiving Channel T/R Module for the Next Generation SAR Payload (차세대 SAR 탑재체를 위한 이중 수신 채널 T/R 모듈 설계)

  • Won, Young-Jin;Youn, Young-Su;Woo, Sung-Hyun;Yoon, Jae-Cheol;Keum, Jung-Hoon;Kim, Jin-Hee
    • Aerospace Engineering and Technology
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    • v.11 no.2
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    • pp.1-11
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    • 2012
  • This paper describes the transmit/receive(T/R) module for the space based X-band active phased array radar. T/R module is the integrated module which is assembled by the transmitting and receiving RF semiconductor devices to enable the electronically beam steering of the phased array antenna and the key component of the SAR payload. T/R module can selectively receive the polarization signals by the switch according to the established technology but now the technological trend of the T/R module is to receive the horizontal and vertical polarization signal simultaneously. Therefore the research and development of the dual polarization receiving channel T/R module is actively in progress. In this study, as the prior research for the next generation SAR payload, the technological trend of the active phased array radar T/R module and the result of the preliminary design of the dual receiving channel T/R module were described.

A Study of Mobile Phone Interface Module Development for DGPS (GDPS를 위한 휴대전화 Interface Module 개발에 관한 연구)

  • 김창수;윤희철;이태오;정성훈;임재홍
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.05a
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    • pp.197-200
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    • 2002
  • The current Inn technique is many problems that is permission of radio station using RF Wireless Modem, that is influence of geographic obstacle using radio wave, that is frequency interference, that is finiteness of frequency resources. In this paper, we are solved many elements, IM replaces RF Wireless Modem, we suggest transmission technique of correction message using mobile phone, we researched Interface Module development which is linkage of DGPS receiver and mobile phone. IM can transmit correction message passing RS-232 port and modem communication control. IM of base station is initialized RS-232 port and modem to move station for correction message transmission, IM waited response mode. IM of move station is initialized RS-232 port and modem, IM requests hand shaking to base station, completed connection establishment. Users are worked Differential surveying using receiving correction message between mobile phones.

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Design of the Transceiver Module for RF Data Communication in ISM Frequency Band (ISM 대역 무선데이터 통신용 송수신 모률설계)

  • Kim Yung-Jin
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.7
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    • pp.1165-1171
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    • 2006
  • In this paper, we designed radio data transceiver to control the machine or equipments for automation in local areas. The designed module can transmit data with 153.6Kbps and uses 424MHz RF carrier to transmit data in the ISM band regulation. It has a processor, CPLD chip of the Altera Company, to control the data in transmitting and receiving. The processor is implemented by programming with VHDL. We will make this module with compact in dimension and higher data rate and apply to RFID technology.