Through-wall imaging is a potentially game-changing military technology that could be used to locate enemy combatants inside of a building in an urban combat zone. Unfortunately this technology continues to be a topic of research rather than an operational capability. There are many technologies being researched to image through walls but radar is most promising because radio waves routinely propagate through walls to great effect. Examples include an AM or FM broadcast receiver that works indoors. Cell phones work indoors. Wireless routers deployed indoors often provide good coverage outdoors.
A through-wall radar system directs its transmit and receive antennas toward a wall and image or detect what is on the other ...