中文摘要：

目的：探讨天线的水平极化和垂直极化对生命探测仪检测效果的影响．方法：对10名受试对象分别采用水平和垂直两种极化方式采集呼吸信号，比较两种信号的幅值；对两种极化方式下的呼吸信号做功率谱估计，对两组谱估计值做配对t检验．结果：水平极化方式下测得的呼吸波信号幅值大于垂直极化方式下测得的呼吸波信号幅值，水平极化与垂直极化测得的呼吸信号能量有统计学意义（P〈0．01）．结论：水平极化方式下的呼吸信号能量明显大于垂直极化方式．当被测对象站立时，天线水平极化方式的检测效果好于垂直极化

英文摘要：

AIM： To discuss the influence of two antenna polarization modes （horizontal polarization and vertical polarization） on the detecting effect of Life-Detection Instrument. METHODS： Respiration signal in horizontal polarization and vertical polarization modes on 10 people were respectively sampled and the amplitudes of the two types of signals were compared. The power of signals in the two polarization modes was estimated, and paired t-test on the estimated values of the power in the 2 groups was conducted. RESULTS： The amplitude of respiration wave in horizontal polarization mode was higher than that in vertical polarization mode. Significant difference existed in the power in the two polarization modes（ P 〈0.01 ）. CONCLUSION： Power of respiration signal in horizontal polarization mode is obviously higher than that in vertical polarization mode. When testing the standing objects, the detecting effect in horizontal polarization mode is better than that in vertical polarization mode.