Human Target Enhancement Based on Radon Fourier Transform in Through-Wall Imaging Radar

Through-wall imaging radar (TWIR) usually transmits ultra-wideband (UWB) signals to obtain high-range resolution and penetrate walls to image the concealed human targets. Because of the round-trip high attenuation of walls and low reflectivity of human target, the received human target echoes are extremely weak, and consequently it is necessary to enhance the human target echoes and improve the low signal-to-noise ratio (SNR) before image formation. However, directly applying the conventional moving target detection (MTD) is faced with the range migration issue due to the high-range resolution of UWB TWIR. In this paper, we introduce the radon-Fourier transform (RFT) into the UWB TWIR to enhance the human target echo in the velocity domain, which can overcome the range migration. Simulation results show that noise can be effectively suppressed and target echoes can be significantly enhanced.