中文摘要：

为了抑制雷达式非接触生命探测系统中的动目标干扰，提出可跟踪干扰谱峰的滤波算法，用于检测受到同频带干扰影响的呼吸信号。对信号一次滤波后．进行Yule—Walker功率谱估计，发现可能的同频带干扰谱峰．通过与标准呼吸信号进行归一化互相关系数计算，对干扰谱峰定位，从而进行二次滤波，提取呼吸信号。结果表明，经二次滤波算法处理后，呼吸信号中同频带干扰谱峰被识别并抑制。对于单一同频带干扰谱峰，该算法能有效抑制同频带干扰，提取呼吸信号。

英文摘要：

To develop a filtering algorithm which could trace the spectral peaks of the interference and which was used to extract the breath signal with the same band interference in radar non-contact life-detecting system, second filtering algorithm was studied. Through first filtering,the probable interfering spectral peaks （ISP） could be detected by Yule-Walker spectrum estimating and could be located by calculating the coefficients of normalized cross-correlation function according to standard breath signal. Thus the breath signal could be extracted through a second filtering. By using the second filtering algorithm （SFA）, the same band interfering spectral peaks with breath signal could be recognized and inhibited. So we conclude that the same band mono-ISP could be inhibited by using SFA and breath signals could be effectively extracted.