MULTICHANNEL ULTRA WIDE BAND BASED (UWB-BASED) RADAR LIFE DETECTOR AND POSITIONING METHOD THEREOF

摘要

A multichannel ultra wide band based (UWB-based) radar type life detector and a two-dimensional positioning method thereof are provided. The life detector comprises a transmitting antenna and three receiving antennas, which respectively form three radar echo signal channels. The two-dimensional positioning method comprises the following steps: A1, enhancing a weak vital sign signal of a static human body in each channels and integrating a radar echo signal in distance in each channels through adopting a method of integrating eight points at an interval of four points; scattering the integrated signal for decomposing, reconstructing and synthesizing a target echo signal and a distance signal; carrying out digital filtration and digital differentiation on the target echo signal and realizing the enhancement of the weak usable signal; A2, distinguishing one-dimensional distance, carrying out space frequency analysis in each channels according to the target echo signal obtained after digital filtration and digital differentiation and the distance signal, and respectively obtaining three projecting signals of the target in three channels; and A3, confirming the two-dimensional position information of the target according to the three projecting signals and displaying an image.