穿墙生命探测回波信号分析

Signal Analysis of Through-the-Wall Surveillance

穿墙生命探测(TWS)是研究障碍物后有无生命现象的一种探测技术。该文主要研究基于连续波体制的TWS探测器回波信号。推导了这种探测器的回波信号表达式,根据生命体征特点,采用简谐振动模型,利用贝塞尔函数对回波信号展开分析并进行了实验验证。实测信号和仿真信号的比较结果表明二者吻合良好。详细分析了穿墙前后TWS探测器回波变化特征,指出穿墙后信号处理的重点是对呼吸信号的检测。

Through-the-Wall Surveillance （TWS） is a kind of detection technique for finding human beings behind barriers. The echo signal of TWS detector which is based on continuous wave is investigated. The signal expression is derived, and a simple harmonic vibration model based on the movement characteristics of human body is applied. The expression is extended in Bessel series. Experimental measurement is accomplished to verify the theoretical derivation. The comparison of experimental signals to simulated signals indicates that they are well fit. The difference of the echo signal of TWS detector between with-or-without-wall is analyzed, and it shows that the breath movement component is primary when a human being is detected through a wall. The results are useful for further study on signal processing of TWS detector.