Image sharpening with waveform compensation for the frequency-domain DORT with a single-antenna UWB radar

Ultra wide-band (UWB) radar is an attractive technology in a variety of applications including security systems. In that pursuit, it is essential to develop low-cost systems that produces clear target images. We have recently developed an imaging method for a simple radar system with a single antenna, namely the frequency-domain DORT (French acronym for decomposition of the time reversal operator) [1] by extending the conventional DORT [2], [3], [4]. Since a point target is assumed, this method cannot produce clear images for a finite-sized target. As a result, images are blurred and compromise image resolution. This study proposes a radar imaging method that can be applied to a finite-sized target. The method modifies the original frequency-domain DORT by introducing a compensation process for the waveform distortion caused by finite-size effects. The effectiveness of the modified method is established with numerical simulations.