Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Implementation of a Labview Based Time-Frequency Domain Reflectometry Real Time System for the Load Impedance Measurement

부하 임피던스 측정을 위한 랩뷰기반 시간-주파수 영역 반사파 실시간 시스템 구현

  • Park, Tae-Geun (Dept. of Electrical & Electronic Engineering,, Yonsei Univ.) ;
  • Kwak, Ki-Seok (Dept. of Electrical & Electronic Engineering,, Yonsei Univ.) ;
  • Park, Jin-Bae (Dept. of Electrical & Electronic Engineering,, Yonsei Univ.) ;
  • Yoon, Tae-Sung (Dept. of Electrical Engineering, Changwon National Univ.)
  • 박태근 (연세대학교 전기전자공학과) ;
  • 곽기석 (연세대학교 전기전자공학과) ;
  • 박진배 (연세대학교 전기전자공학과) ;
  • 윤태성 (창원대학교 전기공학과)
  • Published : 2006.07.12
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Abstract

The purpose of this paper is to implement a Labview based TFDR Real Time system through the instruments of Pci eXtensions for Instrumentation(PXI). The proposed load impedance measurement algorithm was verified by experiments via the implemented real time system. The TFDR real time system consisted of the reference signal design, signal generation, signal acquisition, algorithm execution and results display parts. To implement real time system, all of the parts wore programmed by the Labview which is one of graphical programming languages. In the application software implemented by the Labview we were able to design a suitable reference signal according to the length and frequency attenuation characteristics of the target cable and controled the arbitrary waveform generator(ZT500PXI) of the signal generation part and the digital storage oscilloscope(ZT430PXI) of the signal acquisition part. By using the TFDR real time system with the terminal resistor on the target cable, we applied to the load impedance measurements. In the proposed load impedance algorithm a normalized time-frequency cross correlation function and a cross time-frequency distribution function was employed to calculate the reflection coefficient and phase difference between the input and the reflected signals.

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