Abstract:

The design method of a novel ultra-wideband (UWB) receiver for impulse ground penetrating radar systems is described, and the practical circuit of the UWB receiver is implemented. The basic principle of the receiving signal is equivalent-time sampling. The key circuits of the receiver include the pulse generator on a picosecond level, the Schottky diode balanced sampling gate, holding and amplifier circuit and the magic-T hybrid. The sampling bandwidth of the receiver is 4 GHz, which agrees with the calculated value, and the sampling efficiency is as high as 40%. The experimental results show that the shape of the base band signal after equivalent-time sampling agrees very well with the original microwave signal, thus validating the good performance of the ultra-wideband receiver. Therefore, the UWB receiver meets the requirements to receive the echo signal of the ultra-wideband impulse ground penetrating radar.