| 摘要: |
| 在超宽带穿墙雷达接收机系统中，其关键的等效采样技术需要一种极窄脉宽高电压的脉冲触发采样门电路来对接收信号进行采样。介绍了超宽带取样脉冲产生技术，讨论并分析了几种常用超宽带脉冲产生方法的特点及其局限性。提出了新型的肖特基二极管脉冲整形网络，设计并实现了应用于等效采样接收机系统的新型亚纳秒取样脉冲产生器，很好地结合了雪崩晶体管与脉冲整形网络的优势，在显著减小脉宽的同时保持了较高的脉冲幅度。通过仿真分析和制作测试，获得了脉冲底宽为400 ps、幅度为6.46 V和波动水平为-14.7 dB的单极性窄脉冲，实测结果与设计数值一致性良好。这种简单高效廉价的电路十分符合超宽带穿墙雷达等效采样接收机取样脉冲的设计。 |
| 关键词: 超宽带；穿墙雷达 取样脉冲产生器 等效采样；雪崩晶体管 肖特基二极管 |
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| Design of a novel sampling pulse generator for ultra-wideband through-wall radar |
| GUO Yu,ZHU Guo-fu |
| () |
| Abstract: |
| In the receiver of through-wall radar,equivalent sampling technology is the key technology which requires a narrow and high-amplitude pulse to trigger the sampling gate for sampling. In this paper,the ultra-wideband(UWB) pulse technologies are described,and then different approaches for generating UWB pulse are analyzed and compared. The considered pulse generation technologies are based on logic gates,Step-Recovery Diodes(SRD) and avalanche transistors. Furthermore,a novel approach for the sub-nanosecond sampling pulse generator of the equivalent sampling receiver is investigated. The basis of the generator is an avalanche transistor and a unique pulse-shaping circuit,which is composed of the Schottky diode and used to reduce the pulse width and maintain the higher pulse amplitude. Finally，the sampling pulse generator with pulse duration of 400 ps，pulse amplitude of 6.46 V and ringing level of -14.7 dB is simulated and fabricated. Good agreement between the measured and simulation results is achieved. With the features such as simple structure,stable performance and low cost,the proposed design is ideal for the sampling pulse of the UWB equivalent sampling receiver. |
| Key words: UWB through-wall radar sampling pulse generator equivalent sampling avalanche transistor Schottky diode |
《电讯技术》编辑部 