探地雷达回波信号等效采样控制系统硬件设计  

Hardware design of equivalent sampling control system for echo signal of ground penetrating radar

作　　者：许会[1] 牛长富[1] 邱燕霖[2] 

机构地区：[1]沈阳工业大学辽宁省先进在线检测技术重点实验室,沈阳110870 [2]中国民用航空局东北地区空中交通管理局,沈阳110043

出　　处：《沈阳工业大学学报》2012年第2期186-191,共6页Journal of Shenyang University of Technology

基　　金：辽宁省创新团队基金资助项目(2009T074)

摘　　要：针对无载频探地雷达系统具有复杂的系统时序控制的特点,设计了一种利用FPGA配合可编程延时器件和时变增益器件来完成复杂时序控制的硬件系统.该系统由信号处理器DSP发出控制指令并完成后期算法,再通过USB2.0实现与上位机的数据通信,给出并验证了以DSP为核心、以FPGA实现探地雷达数据采集控制的方法,实现了最小半脉宽2 ns的等效采样,最小延时0.15 ns、最大延时1 313.25 ns的采样时窗,及理论数据吞吐量为480 Mbit/s的数据传输.系统的集成度高,可嵌入应用,硬件易更新.Aiming at the characteristics that the ground penetrating radar has the complicated system time sequential control, a hardware system with adopting FPGA and in combination with programmable delay device and time-varying gain device to accomplish the complicated time sequential control was designed. A digital signal processor （DSP） was used to send out the control commarlds and complete the later algorithm. The data communication with upper computer was realized through USB2. 0. The control method for the da- ta acquisition to be realized through taking DSP as the core and using FPGA＇ in ground penetrating radar was given and verified. The equivalent sampling with the minimum half pulse width of 2 ns, the sampling time with the minimum and maximum delay of 0. 15 ns and 1 313.25 ns, as well as the data transmission with the theoretical data throughput of 480 Mbit/s are realized. The system exhibits high integration level and can be used in embedded mode. Moreover, the hardware of the system is easy to be updated.

关 键 词：探地雷达 等效采样 时变增益放大 时序控制 数据采集 现场可编程逻辑器件 数字信号处理器 USB通信 

分 类 号：TN958.3[电子电信—信号与信息处理]