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The through-the-wall human being detection and localization in the complexenvironments by using the radar system has many possible applications such asfor law enforcement, and search and rescue missions in disaster-stricken areas.This paper discusses the experimental study of ultra-wideband impulse radar forobscured human respiration detection through spectrum analysis. We investigatethe effect of the range of human-wall and radar-wall to the peak factor valueof human respiration sign power spectrum. This result will be useful as areference for analyzing the possibility of the sign to be detected by the radarwith respect to the distance from both sides. According to the experimentalresults, longer both distance increases gradually the peak factor value.However, the peak became narrower. Besides, at a very short distance betweenareas and walls, the peak factor became very small because of the strongreflection of both objects. Therefore, an adaptive threshold technique andbackground suppression are needed in order to maintain the detectionperformance against any possible conditions.

Experimental Study of Through-the-Wall Respiration Sign Detection Using Ultra-wideband Impulse Radar