Layout and Target Estimation Method of Sheltered Area for Multipath Signal

Building environment sensing and shelter target detection technology based on low frequency electromagnetic wave has attracted the attention of researchers around the world. Low frequency electromagnetic wave has good penetration and low loss characteristics, which can realize building structure layout imaging and shelter target detection and tracking, and has important application prospects in the fields of anti-terrorism and stability maintenance, disaster relief and urban mapping. Due to the occlusion of urban buildings, electromagnetic wave propagation will produce complex electromagnetic phenomena such as reflection, transmission and diffraction, resulting in imaging defocusing and unstable target detection and tracking. This paper proposes a reconstruction method of building layout based on the combination of transmitted and reflected signals. Through the result level fusion of reflected projection images and transmission tomography images, the problems of wall position deviation and serious artifact interference existing in the reconstruction process are solved, and efficient and high-precision imaging of building layout under limited scanning paths is realized. The research on building layout and target imaging methods for multipath signals conducted in this paper can not only improve the detection performance of radar equipment in urban buildings, but also be applied to reconnaissance and surveillance in non-line-of-sight areas such as street corners, providing reliable information for anti-terrorism, stability maintenance and automatic driving, and playing an important role in national defense and social applications.