一种采用TDR的传输线阻抗测量和校准  

A method of transmission line impedance measurement and calibration using TDR

作　　者：胡媛媛 张敏娟[1,2] 卫晨博 崔一凡 高云峰 Hu Yuanyuan;Zhang Minjuan;Wei Chenbo;Cui Yifan;Gao Yunfeng(School of Information and Communication Engineering,North University of China,Taiyuan 030051,China;Research Institute Frontier Interdisciplinary Sciences,North University of China,Taiyuan 030051,China;School of Instrument and Electronics,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学信息与通信工程学院,太原030051 [2]中北大学前沿交叉科学研究院,太原030051 [3]中北大学仪器与电子学院,太原030051

出　　处：《电子测量技术》2024年第19期63-69,共7页Electronic Measurement Technology

基　　金：山西省基础研究计划项目(202303021211163)资助。

摘　　要：时域反射技术作为一种能够直观反映传输线阻抗变化的技术,广泛应用于阻抗检测领域。但在对传输线进行特性阻抗测量的过程中存在校准不准确、阻抗测试精度低等问题。针对这些问题,本文设计了特性阻抗时域测量和校准系统。该系统采用最短区间估计算法测量传输线上的电压,实现了对传输线特性阻抗的测量。通过对四根具有不同长度和特性阻抗的同轴线缆进行测量,测量结果的误差控制在±1%以内,符合阻抗测量的要求。实际结果表明,该系统能够精确地测量传输线的阻抗。此方法简化了操作流程、规避了手动选择所导致的主观偏差,为传输线阻抗检测技术的发展提供了一种新方法。Time domain reflection technology,as a technique that can intuitively reflect changes in transmission line impedance,is widely used in the field of impedance detection.However,there are problems such as inaccurate calibration and low impedance testing accuracy in the process of measuring the characteristic impedance of transmission lines.In response to these issues,this article designs a time-domain measurement and calibration system for characteristic impedance.The system uses the shortest interval estimation algorithm to measure the voltage on the transmission line,achieving the measurement of the characteristic impedance of the transmission line.By measuring four coaxial cables with different lengths and characteristic impedances,the measurement error is controlled within±1%,meets the requirements of impedance measurement.The actual results show that the system can accurately measure the impedance of transmission lines.This method simplifies the operation process,avoids subjective bias caused by manual selection,and provides a new method for the development of transmission line impedance detection technology.

关 键 词：时域反射技术 特性阻抗测量 最短区间估计法 校准 

分 类 号：TN98[电子电信—信息与通信工程]