Design of high scanning rate for array impulse ground penetrating radar

摘要

A high-efficiency scheme based on both time division multiplexing (TDM) and parallel processing of FPGA is proposed in this paper to address the problem of high scanning rate in high-speed measurements with UWB array GPR. The merit of this new scheme is that all trigger signals of all the channels can be delayed in a controllable step through the same delay chip at different times. Each channel of the array GPR can obtain a sample during the same PRF. Additionally, data acquisition time has been reduced drastically by taking full advantage of the parallel processing capabilities of FPGA. Consequently, the scanning rate of the array GPR with this new scheme has been increased drastically. Furthermore, a dual-band GPR with the central frequency of 1GHz and 2GHz is designed to validate the efficiency and stability of the proposed scheme. Experiments show that each antenna of this dual-band GPR can obtain 512 samples per scan at a super high scanning rate of 1,900 scans per second, and it is very stable and efficient.