Through-wall imaging by TE and TM hybrid polarization inversion based on FDFD and frequency hopping scheme

In this paper, TE and TM hybrid polarization contrast source inversion (CSI) based on FDFD and frequency hopping scheme is applied to through-wall imaging (TWI). The through-wall configuration is incorporated as a priori information in the background configuration of our FDFD inversion scheme. Multiple frequencies are used to improve the imaging performance. As the permittivity and conductivity of the targets are always higher than those of the air, the positivity of the contrast is utilized as a priori information to enhance the inversion performance. 2D simulation results show that the permittivity and conductivity of the targets behind the wall can be well reconstructed.