The Application of Time Domain Beamforming to Ultra-wideband Through-wall Imaging Radar
Chen Jie①②; Fang Guang-you①; Li Fang①
①Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China; ②Graduate University of the Chinese Academy of Sciences, Beijing 100039, China
Abstract:Ultra-WideBand (UWB) through-wall imaging radar is a promising technique and can be widely used for detecting and locating moving people through obstacles. In this paper, time domain beamforming method is presented for UWB through-wall imaging applications. The propagating wave slows down, encounters refraction and is attenuated as it passes through the wall. Firstly, the travel time is calculated from the antenna to the target in closed form based on the refraction model. Next, the beamformer design is presented, which incorporates the wall effects. Finally, Finite-Difference Time-Domain is used to demonstrate the efficacy of beamforming method and the impact of incorrect estimates of the wall thickness and dielectric constant on performance is also considered.