UWB Radar for detection and positioning of human beings in complex environment has been developed and manufactured. Novelty of the radar lies in its large operational bandwidth (11.7 GHz at - 10 dB level) combined with high stability. Detection of respiratory movement of a person in laboratory conditions has been demonstrated. Based on experimental results human being radar return has been analysed in frequency band from 1 GHz till 12 GHz. Novel principle of human being detection is considered and verified experimentally.@en