探地雷达回波信号等效采样控制系统硬件设计

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2ns的等效采样，最小延时0.15ns、最大延时1313.25ns的采样时窗，及理论数据吞吐量为480Mbit/s的数据传输.系统的集成度高，可嵌入应用，硬件易更新.

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

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 commands and complete the later algorithm.The data communication with upper computer was realized through USB2.0.The control method for the data 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.