A High Voltage Pulse Generator used in Ground Penetrating Radar

The ultrawideband-impulse ground penetrating radar (GPR) is widely used in shallow surface exploration. The performance of GPR is mainly determined by the pulse generator and evaluated by the resolution, detection distance and so on. A pulse with narrow width, high repetition frequency and high amplitude usually brings a better resolution. In this paper, we proposed a simple and reliable pulse generator circuit structure, which can overcome the instability of trigger signal and is easy to integrated digital circuits. Then, we analyzed the power of the collector resistance and factors affecting the highest repetition frequency. The typical 10%-90% fall time is 2.88ns and the amplitude is up to 248V when repetition frequency is 100KHz.