Ultra wideband sees through walls

I'm trying to track down more details on this project, but it looks to me like they are using some UWB technology in this device.

DefenseLINK News: New Device Will Sense Through Concrete Walls
"The new "Radar Scope" will give warfighters searching a building the ability to tell within seconds if someone is in the next room, Edward Baranoski from the Defense Advanced Research Projects Agency's Special Projects Office, told the American Forces Press Service."

Ultra wideband - Wikipedia, the free encyclopedia

Ultra wideband usually refers to a radio communications technique based on transmitting very-short-duration pulses, often of duration of only nanoseconds or less, whereby the occupied bandwidth goes to very large values. This allows it to deliver data rates in excess of 100 Mbit/s, while using a small amount of power and operating in the same bands as existing communications without producing significant interference. However it is not limited to wireless communication, UWB can also use mains-wiring, coaxial cable or twisted-pair cables to communicate - with potential to deliver data faster than 1 gigabit per second.