Computer Model of Indoor Environment Signature for Sensing TWR Applications

A portable handheld RADAR called through-wall radar (TWR) is utilized for the identification and localization of stationary and/or moving objects, particularly people concealed behind solid walls or obstacles. Applications in Homeland Security and Defense that are in need for through-wall detection of both live and non-living entities are suited for it. Techniques have been proposed for the determination of the radar cross section (RCS) of various types of targets. Depending on the target size and selected frequency range, RCS can be investigated in either an outdoor environment, indoor environment, or inside an anechoic chamber. This paper has attempted to analyze simple geometric objects and evaluate the effect of variables variation such as frequency and shaping effects on the generated radar cross section (RCS). Consequently, the established results led to the study and analysis of a much-complicated indoor environment containing five furniture pieces in a frequency range of 1-3 GHZ of the through the wall radar imaging (TWRI) range. The RCS evaluation is achieved using high frequency structure simulator (HFSS) tool. The targets to be measured are 3D modeled by Computer Aided Design (CAD) firstly and then using Borohydride solution setup to illuminate the target in far-field conditions. The simulation results clearly show a substantial variation in scattering with azimuth, material, shaping and frequency factors. The goal is to achieve radar cross section estimation and differentiation of objects to design an ultrawideband (UWB) radar systems for indoor environment sensing and through-wall imaging.