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近日,有媒体报道英国国防部研究出了Wi-Fi穿墙雷达。透过一英尺厚的墙壁,“看”到墙那边人的位置、移动速度和动向,甚至根据细微的呼吸探测到静止不动的人,这就是英国国防部最近资助研究的Wi-Fi穿墙雷达。它体积小巧,非常适合巷战或警方的人质解救行动。而且由于其本身并不发射任何无线电波,所以不会被反雷达装置侦测出来。其工作方式见图1。(1)移动物体:当Wi-Fi无线电波被一个移动物体弹开后,其频率发生变化。例如,假如一个人走向了Wi-Fi波源,反射波的频率增强;而假如这个人正在远离波源,反射波的
Recently, some media reports reported that the Department of Defense developed a Wi-Fi wall-penetrating radar. Through one-foot-thick walls, “watching” the location, speed and movement of people over the wall, and even resting on subtle breaths, this is what the Department of Defense recently funded the study of Wi- Fi through the wall radar. Its compact size is ideal for street fighting or police hostage rescue operations. And because it does not emit any radio waves, it will not be detected by the anti-radar device. The way of working shown in Figure 1. (1) Moving objects: The frequency of a Wi-Fi radio wave changes when it is bounced by a moving object. For example, if a person moves toward a Wi-Fi wave source, the frequency of the reflected wave increases; and if the person is moving away from the wave source,