摘要
探地雷达回波信号具有频带宽、动态范围大的特点,如采用实时取样方法对其取样,则要求取样系统具有极高的采集速率和分辨率,目前在硬件实现上存在困难。考虑到探地雷达系统所固有的特点,本文提出采用等效取样方法实现雷达回波信号的取样,讨论了取样变换电路的选型和设计,实现了一个基于AD9500的实际电路。实验结果表明,该电路克服了速度方面的困难,实现了雷达回波信号的取样,提高了信噪比,增加了系统的带宽,满足了雷达系统的要求。
The echo of ground penetrating radar normally characterizes in broad wideband, large dynamic range. In real time sampling occasion, extremely sampling speed and resolution is demanded, which is hard to achieve by hardware resources at present. Considering the inherit feature of ground penetrating radar system, we present a equivalent sampling method to realize the sampling of radar echo signal, and discuss the selecting of sampling convert circuit. So a step-sampling circuit based on AD9500 is completed. The result demonstrates that the circuit can effectively conquer the speed difficulty and reliably achieve radar echo signal sampling. The system improve the Signal-to-Noise rat, broaden the system wideband, and meet the requirements of radar system.
出处
《电子测量技术》
2007年第10期1-3,196,共4页
Electronic Measurement Technology
基金
教育部开放式基金资助项目(K200611)
