Through-Wall Imaging Radar

Abstract : The ability to locate moving targets inside abuilding with a sensor situated at a standoffrange outside the building would greatly improvesituational awareness on the urban battlefield. Aradar imaging system was developed to imagethrough walls, providing a down-range versuscross-range image of all moving targets at avideo frame rate. This system uses an S-band,frequency-modulated, continuous-wave radarwith a spatial frequency range gate coupledto a time-division multiplexed, multiple-input,multiple-output antenna array to rapidly acquire,process, and display radar imagery at a framerate of 10.8 Hz. Maximum expected rangethrough a 20 cm thick, solid concrete wall is20 m. Measurements show that this system canlocate humans (moving or standing still) behind10 and 20 cm thick, solid concrete walls andthrough cinder-block walls.