Through-wall imaging system using horn antennas

摘要

Through-wall Radar (TWR) is a non-destructive technique used to determine targets behind a visually obstructed area. The common problems faced by this system are false alarms and clutters present in the environment. In this paper, we discuss the design and fabrication of a pair of Ultra Wide Band (UWB) horn antennas. These antennas, along with Vector Network Analyzer (VNA) as the waveform generator is used to perform several A scans and then combine them into a single B-scan image of the targets. MATLAB is used to successfully generate a raw 2-D image of the target with a minimal error in the X,Y coordinates of the targets. The clutter in the raw image is then removed using an algorithm to obtain a filtered image. Experiments are conducted for various wall materials of different dielectric constants. The outcome of the work lays a foundation for the implementation of more complex TWR systems.