Adaptive RF interference canceller in high dynamic range Doppler radar for landmine detection

摘要

Doppler radar detects a target's movement by characterizing the frequency variations of the reflection RF signal. In this paper, Doppler radar is utilized for detecting landmines through vibration sensing. By checking the Doppler frequency of reflection signal resulting from the landmine's response to the vibration stimulus, the buried landmine can be detected. In this operation, large RF interferences in the system may diminish the dynamic range of Doppler radar and degrade its sensing performance. An adaptive RF interference canceller is designed to enhance the reflection signal from the landmine and increase the dynamic range of Doppler radar by more than 20 dB. For performance validation, experiments on detecting a landmine stimulated by a vibration source are conducted.