摘要
介绍了用于土壤参数测量的时域反射仪硬件系统的设计与实现方案,并研制出样机TDR-I。该样机使用DSP做主控板,利用阶跃恢复二极管(SRD)产生140ps上升沿的快沿发射脉冲,采用快慢斜波比较法获得等效采样步进精度为8.7ps的取样脉冲。经过实验数据获取验证,该系统测量效果良好。
Hardware design of a portable time domain reflectometry（TDR） is introduced in this paper. This TDR can be applied to test soil parameters. A prototype of TDR-I has been developed, in which a DSP board is used as the main control unit. A 140 ps rising edge transmit pulse is generated by step recovery diode. The precision of step pulse is achieved to be 8.7 ps by equivalent sampling based on the comparison of fast ramp and slow ramp. The experimental results verified the good performance of the system.
出处
《电子技术应用》
北大核心
2010年第1期75-78,共4页
Application of Electronic Technique
关键词
时域反射仪
等效采样
步进脉冲
采样门
time domain reflectometry
equivalent sampling
step pulse
sampling gate
