新型纳秒级探地雷达脉冲源设计 .pdfVIP

学兔兔 第32卷 第11期 仪 器 仪 表 学 报 V01．32 No．11 2011年11月 Chinese Journal of ScientificInstrument NOV．2011 ：l： 新型纳秒级探地雷达脉冲源设计 许 会，牛长富，李邦宇，吴国瑞 (沈阳工业大学先进在线检测技术省重点实验室 沈阳 1 10870) 摘 要：针对超宽带探地雷达脉冲源的要求，提出并验证了一种利用FPGA触发来合成彼此有任意延迟的窄脉冲波形合成方 法。研究和实际设计了一种提高脉冲源性能的新型宽范围输人输出的线性直流电源，并利用此电源制成了适用于多种雪崩管 为核心的宽范围纳秒级脉冲源，给出了脉冲源各个单元的设计、及雪崩三极管的筛选及老化处理方法。在50 Q负载上得到了 脉宽在2～50 as、幅度在20～180 V的多种超宽带窄脉冲，并对多种雪崩管的雪崩性能进行了对比，给出了集电极充电电容与 脉冲幅度和宽度的关系。 关键词：纳秒级脉冲源；雪崩三极管；波形合成；FPGA触发；宽范围直流电源 中图分类号：TN958 文献标识码：A 国家标准学科分类代码：510．70 Design of a new nanosecond GPR pulse source Xu Hui，Niu Changfu，Li Bangyn，Wu Guorui (Advanced Onli~Measurement Technology Key Lab of Liaoning Praise，Shenyang University of Technology， Shenyang 110870，China) Abstract：A kind of waveform synthesis method is proposed and demonstrated，with which arbitrary delay short—pul— ses can be generated and controlled by an FPGA to meet the requirements of ultra wide band~ound penetrating radar pulse source．A new linear DC power supply with wide-ranges of input and output is studied and designed to improve the performance of the pulse source．The self-made power supply is adopted to make a wide range nanosecond pulse source，which is suitable for using many kinds of avalanche transistors as its core．Detailed design method of the nanosecond pulse source is described，and the methods of screening and aging treatment of the avalanche transistors are introduced．Multiple kinds of nanosecond pulses are obtained on 50 l-I load with the amplitude between 20～ 1 80 V and the pulse width between 2—50