一种等效时变增益探地雷达接收机设计  

Design of Equivalent Sampling Ground Penetrating Radar Receiver with Time-varying Gain Dynamic Range

作　　者：徐伟[1] 张明[1] 

机构地区：[1]中国人民解放军工程兵学院工程装备管理与保障系,江苏徐州221004

出　　处：《现代雷达》2016年第11期75-78,83,共5页Modern Radar

摘　　要：无载波冲激体制的探地雷达具有脉冲波形产生简单、测量速度快、不存在频域旁瓣干扰等特点,目前的商用探地雷达大多采用这种体制。但是现有的探地雷达系统普遍存在接收机动态范围较小的问题,限制了其在深层探测领域的应用。针对冲激体制探地雷达的大动态范围接收机技术进行深入研究,提出了适用于等效采样电路的时变增益动态范围压缩技术,设计的动态压缩电路可以有效地对接收信号进行20 d B的动态范围压缩,并且研制出了性能优越的等效时变增益探地雷达接收机。Impulse ground penetrating radar （ GPR） has some obvious advantages in the field survey, such as simple waveform gen-eration, high pulse repetition, no interference in frequency domain and so on. The common GPR systems are based on the impulse radar technique and are prevalent in the commercial market. However, small dynamic range is the common problem in the GPR re-ceiver system currently, which limits its application in the field of deep penetrating. In this thesis, the large dynamic range receiv-er technology of impulse GPR system is studied deeply and time-varying gain dynamic range compression technology is proposed for the equivalent sampling circuit. The technology can provide 20 dB dynamic range compression for the received signal. A physical receiver has also been developed with good performance.

关 键 词：探地雷达 接收机 动态范围 时变增益 

分 类 号：TN957.5[电子电信—信号与信息处理]