探地雷达采集系统时间展宽电路校正方法研究  

Research on time broadening circuit correction method of ground penetrating radar acquisition system

作　　者：任以晨 郑隆浩 张志刚 宾峰[1,2] 唐立军 REN Yichen;ZHENG Longhao;ZHANG Zhigang;BIN Feng;TANG Lijun(School of Physics&Electronic Science,Changsha University of Science&Technology,Changsha 410114,China;Hunan Province Higher Education Key Laboratory of Modeling on the Near-Eeath Electromagnetic Environments,Changsha 410114,China)

机构地区：[1]长沙理工大学物理与电子科学学院,湖南长沙410114 [2]近地空间电磁环境监测与建模湖南省普通高校重点实验室,湖南长沙410114

出　　处：《电子设计工程》2022年第11期1-5,共5页Electronic Design Engineering

基　　金：湖南省重点研发计划项目(2018GK2054);湖南省高校重点实验室项目(N201905);湖南省水利科技项目(XSKJ2019081-44)。

摘　　要：时间展宽电路是探地雷达随机等效采样系统的核心模块,用于将纳秒级的脉冲信号展宽为微秒级的脉冲信号,实现随机等效采样的数据恢复。由于展宽电路在井下工作的环境温度变化会严重影响其工作性能,目前缺少对电路校正的方法。为此,研究了一种时间展宽电路校正方法。该研究方法为将一个纳秒级脉冲宽度的标准脉冲源作为时间展宽电路的输入信号,得到时间展宽电路的输入输出关系,建立时间映射表,用于校准时间展宽电路。通过改变展宽电路的电容容值来模拟环境温度变化,对时间展宽电路进行测试,结果表明,改进后的时间展宽电路时间测量误差小于0.1 ns。The time spreading circuit is the core module of the groundpenetrating radar random equivalent sampling system,which is used to spread the nanosecond pulse signal into microsecond pulse signal to realize the data recovery of random equivalent sampling.Since the ambient temperature variation of spreading circuits working downhole can seriously affect their operating performance,there is a lack of methods to calibrate the circuits.For this reason,a time-spread circuit calibration method is investigated.The method investigates a standard pulse source with nanosecond pulse width as the input signal of the time spreading circuit,obtains the input-output relationship of the time spreading circuit,and establishes a time mapping table for calibrating the time spreading circuit.The time spreading circuit is tested by changing the capacitance value of the spreading circuit to simulate the ambient temperature change,and the results show that the time measurement error of the improved time spreading circuit is less than 0.1 ns.

关 键 词：探地雷达 随机等效采样 时间展宽电路 校正电路 

分 类 号：TN956[电子电信—信号与信息处理]