适用于探地雷达应用的低过冲平衡脉冲发生器  

Lowovershoot balanced pulse generator for GPR application

作　　者：刘晋伟[1,2] 叶盛波[1] 张群英[1] 尹德[1,2] 方广有[1] 

机构地区：[1]中国科学院电子学研究所电磁辐射与探测技术重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《电子测量技术》2017年第8期58-62,共5页Electronic Measurement Technology

基　　金：国家高技术研究发展计划项目(863计划)(2012AA061403.05)资助

摘　　要：设计了一种新型的超宽带ns级低过冲平衡脉冲发生器。该脉冲发生器包含驱动电路、雪崩三极管脉冲电路和脉冲整形电路3部分,驱动电路用以锐化触发脉冲;雪崩三极管脉冲电路采用独特的晶体管级联结构产生大幅度的高斯脉冲;脉冲整形电路利用并联端接电阻网络和肖特基二极管减小信号反射,最后使用巴仑产生平衡的高斯脉冲,该电路最高可以在300KV脉冲重复频率下正常工作。测量结果表明,在100KV脉冲重频时该脉冲发生器可以输出一对峰峰值为230V、前沿为1.3ns的平衡脉冲,并有着极小的振铃和过冲。这些特征说明,该脉冲发生器在探地雷达应用中有着更深探测距离和更快数据处理速度的优势。A novel nano-seconds ultra-wideband （UWB） balanced pulse generator is designed and demonstrated in this paper. It contains a pulse drive circuit, an avalanche transistor pulse circuit and a pulse forming circuit. The pulse drive circuit produces a sharper trigger pulse and the avalanche transistor pulse circuit uses a novel transistor cascade construction to produce a high amplitude gauss pulse. At last, the pulse forming circuit utilizes parallel butt joint resistor network and schottky diode to eliminate the signal reflection and uses balun to produce a balanced gauss pulse. It can operate well at the pulse repetition frequeney（PRF） up to 300 kHz. Measurement results are presented, which show the output of the generator are balanced pulses with peak values of 230 V at 100 kHz PRF and 1.3 ns in pulse leading edge with very small ringing and overshoot. These characters of the balanced gauss pulses are advantageous for obtaining deeper detection range and costing less data computation time when it is applied to ground penetrating radar applications.

关 键 词：探地雷达 超宽带 雪崩三极管 低过冲 脉冲整形电路 

分 类 号：TN958[电子电信—信号与信息处理]