Design of GPR Transmitting Pulse Signal Based on FPGA

Aiming at the non-contact detection scene of GPR, it is necessary to adjust the repetition frequency of transmitting pulse waveform flexibly, and a GPR pulse signal design based on FPGA is proposed. The scheme uses FPGA to control the generation of adjustable pulse signals, which are amplified by high-frequency power amplifier circuit, and the signal repetition frequency can be adjusted by software. The theory of transmitting pulse waveform design is analyzed, the FPGA logic circuit is designed to generate pulse signal, and the high frequency power amplifier circuit is designed to solve the problem of low power of FPGA signal. The effectiveness of the scheme is verified by experiments. Experimental results show that the pulse signal generated by the scheme has stable frequency amplitude and the output power meets the requirements of non-contact detection. Compared with the traditional pulse signal generation device using switching devices, the structure is simple and the pulse signal can be set flexibly.