Two-Step Imaging Method and Resolution Analysis for UWB Through Wall Imaging

Through wall imaging (TWI) is one of the applications of ultra wideband (UWB) that attracts recent interests for its capability to penetrate the common wall materials. However, in the multi targets imaging scenario, false imaging is a crucial problem leading to the failure of imaging and generating the false target. This paper proposes a two-step imaging method for UWB TWI and analyzes the imaging resolution. The proposed imaging method theoretically solves the problem during the imaging processing. Based on the proposed method, imaging resolution for TWI is analyzed and derived. The results show that the imaging resolution is directly decided by the imaging system time resolution and the imaging method. So it is concluded that the imaging signal with good time resolution, such as UWB short pulse, will result in a good imaging resolution.