四川轻化工大学学报（自然科学版）2026，Vol.39Issue(3)：39-48,10.DOI:10.11863/j.suse.2026.03.05
基于周期性延时衔接法的顺序等效采样方法
Sequential Equivalent Sampling Method Based on Periodic Delay Coupling
摘要
Abstract
To address the limitations of the sampling timing system delay range in timedomain reflectometry(TDR)instruments for long cable fault testing,a sequential equivalent sampling method based on periodic delay coupling is proposed.A detailed comparison with traditional sequential equivalent sampling methods analyzes the advantages of this approach in terms of delay range and sampling speed.The method employs a programmable delay chip to achieve precise stepped delays of the sampling clock signal,using the maximum delay range of the delay chip to connect multiple cycles of the sampling clock,thus extending the delay range.This approach simplifies the hardware design of the stepped delay circuit while ensuring the precision of the stepped delay,significantly reducing hardware costs.A field-programmable gate array(FPGA)is used to sort the sampled data in chronological order to reconstruct the signal being measured.Experiments are conducted to validate a delay range of 10 µs and a stepped delay precision of 10 ps,which can greatly enhance the performance of TDR instruments in the field of long cable testing.关键词
TDR/周期性延时衔接法/FPGA/延时范围/步进延时精度/顺序等效采样Key words
TDR/periodic delay coupling method/FPGA/delay range/stepped delay precision/sequential equivalent sampling分类
信息技术与安全科学引用本文复制引用
杨龙,刘永春,曹勇,田伟,杨帅..基于周期性延时衔接法的顺序等效采样方法[J].四川轻化工大学学报（自然科学版）,2026,39(3):39-48,10.基金项目
工信部行业计量技术规范项目(JJFZ(电子)007-2021) （JJFZ(电子）
广东省重点科技产业质量基础共性技术研究及应用项目(2020B0404030002) （2020B0404030002）
厅市共建智能终端四川省重点实验室(SCITLAB-300010) （SCITLAB-300010）
