Biological radar human body target identification method based on zero crossing point technology

The invention discloses a biological radar human body target identification method based on a zero crossing point technology. The method comprises following four steps of a zero crossing point extracting step, a time domain accumulating step, a signal to noise ratio estimating step and a threshold value judging step. The condition that human body breathing zero crossing point characteristic quantification is detected by a UWB (ultra-wide bandwidth) biological radar is realized in the zero crossing point extraction step; zero crossing point extraction results are accumulated at time in time domain accumulation step, so that misjudgment caused by accident factors is lowered; the signal to noise ratio estimation is used for quantitative indexes of human body target identification; and set threshold values of the quantitative indexes are judged, and automatic identification on a human body target is finally realized in the threshold value judging step.