Objective To diminish the high frequency noise components in bio-radar echo signal using the frequency differentiating property of Hilbert-Huang transform(HHT) so as to improve the abilily of ultra wideband (UWB) bio-radar's identification for life information. Methods The intrinsic mode function(IMF) of the pre-lreated bio-radar echo signal was gntten by the way of empirical mode decomposition(EMD), the IMF was divided into two parts, of which the dominanl component was. noise and useful signal separately, and then the useful information of those IMFs in which noise took the dominant position was extracted, which was combined with the IMFs in which useful signal was dominant to acquire the life information in UWB bio-radar echo signal in order to achieve the target recognition. Results HHT could diminish the noise components of high frequency in UWB bio-ra展开▼
