In this paper, we present a study of short range radar forthrough-the-wall (TTW) detection and tracking of humanbeings. New concepts envisaged here are based on anUltra Wide Band (UWB) waveform and on the use ofnumerous separated antennas. First the choice of thefrequency bandwidth for the ideal radar system isdiscussed. Then a new experimental set-up recently madein our laboratory is presented. This system uses UWBoscillators (VCO) in ultra-fast sweep frequency mode thatare able to cover the 500 MHz - 8 GHz bandwidth. Asimple UWB homodyne set-up is also proposed with threereceiving channels and new performing UWB antennas.This system is now able to detect human motion andlocate it by trilateration. A full wave 2D simulator using the FDTD method hasalso been performed in order to deliver synthetic data forstudying signal processing algorithms (coherent andincoherent). These algorithms, although well known insome other contexts, are here applied to UWB TTWimaging and detection and some quasi real timeformulations are proposed. Results are presented on a testconfiguration computed by the simulator.
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