UWB生物雷达多静止人体目标呼吸检测中“遮蔽效应”的实验研究

Experimental study on shadowing effect of multi static human targets respiration detection with UWB bio-radar

目的:研究使用超宽带(ultra wide band,UWB)生物雷达进行多个静止人体目标探测时的"遮蔽效应",为最终解决多目标探测难题打下基础。方法:以模拟呼吸装置为探测目标,设计UWB生物雷达多静止目标呼吸检测实验,研究目标的呼吸频率、幅度以及目标之间的角度、距离等因素对"遮蔽效应"的影响。结果:"遮蔽效应"主要受多个目标之间的相对位置影响,目标的呼吸频率或呼吸幅度对其影响不明显。结论:在对多个静止人体目标进行呼吸检测时存在"遮蔽效应",产生该效应的主要原因是前一个目标本身对电磁波传播的阻挡,而其呼吸参数改变时对"遮蔽效应"没有明显影响。

Objective To study the shadowing effect when using UWB bio-radar to detect multiple static human targets to solve the problem in multi-target detection. Methods With simulated breathing apparatus as detection targets, the UWB bioradar multi static targets respiration detection experiment was designed, and the influences of distance and angle between targets and its respiratory frequency and amplitude on the shadowing effect were studied. Results The shadowing effect was mainly affected by the relative position of the multiple targets, while the respiratory frequency and amplitude of the target had less influence on it. Conclusion When multi static human targets are detected the shadowing effect does exist, and the effect mainly derives from the block of electromagnetic wave by the front target, while the change of respiratory parameters of the front target has little influence on the effect.