2015 Volume 12 Issue 11 Pages 20150200
This paper presents a novel design of low-frequency coded ground penetrating radar (GPR) for deep detection. In order to increase the signal-to-noise ratio (SNR) of the returned signals of the deep targets, 2048 groups of Golay codes with 8 chips and 1 kW peak power are radiated by the transmitter. The receiver has two receiving channels, the first channel with a gain of 10 dB is used to obtain the reference signals, and the second channel, which has a maximum gain of 50 dB for deep targets and a minimal gain of −10 dB for shallow targets, is designed to receive the radar echoes. The real-time impulse compression is computed with 280 DSP48 slices of FPGA in parallel. Two pairs of fiber modules are used for synchronization between the transmitter and receiver. The transmitter and the receiver are discussed in detail. The experimental results show that the proposed low-frequency coded GPR has good detection performance for deep detection applications.