In-cabin in-vivo detection and interference suppression method based on FMCW millimeter wave radar
Aiming at the increasing number of accidents caused by children left in car,millimeter wave radar are the mainstream choice for in-cabin living detection due to its advantages of good privacy and low cost. At present,respiration signal is used as the basis of detection in living detection radar,but the problem of strong clutter interference in enclosed metal space in cabin is the main technical challenge. To solve this problem,a method of interference suppression combining time-frequency domain and amplitude phase is proposed. Firstly,the amplitude and phase extracted from the time-domain signal are transformed into the frequency domain by Fourier transform,respectively. And then,the amplitude spectrum,phase spectrum and the time-domain amplitude signal after the removal of interframe interference are multiplied by modulo to generate the interference suppression diagram. Finally,the interference suppression diagram is post-processed to obtain the in-vivo detection results. The measured data show that this algorithm can effectively suppress the strong clutter interference,reduce the probability of missing and false alarm,and complete the in-cabin live detection.
万方数据
维普
