Breaking Down the Walls
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In recent tests held at MIT’s Lincoln Laboratory, the radar successfully showed humans moving behind solid concrete, which could give the military a powerful advantage in urban combat situations. In the video below, the Lincoln Lab team shows how the radar can detect images moving behind solid concrete and cinder-block walls.
http://youtu.be/H5xmo7iJ7KA
The researchers’ device combines two rows of antenna — eight receiving elements on top, 13 transmitting ones below — with computing equipment connected to a movable cart. Rather than using visible light to look through walls, which is ineffective, or x-ray, which is too dangerous, the radar system uses microwave technology about as powerful as a traditional cellular phone.
From ExtremeTech:While the system does have limits – it can’t detect beyond walls eight inches thick – the Lincoln Labs team envisions a radar unit mounted on a military vehicle and providing real-time video through walls as far as 60 feet away at a rate of 10.8 frames per second.Basically, it works just like a normal radar system: 44 antennae send out S-band microwaves (2-4GHz, about 10cm peak to peak). Most of these microwaves — 99.4% — bounce off the solid concrete wall. The 0.6% that make it through bounce off any objects on the other side, and then come back through the wall, losing another 99.4% of the waves. By the time the microwaves return to the array, the signal is just 0.0025% of its original strength.
This technology has potential beyond military implications – such as police or emergency-response teams – but the team’s current focus is giving the U.S. military an immense advantage in combat situations.
Project Leader Gregory Charvat told Fox News:“If you’re in a high-risk combat situation, you don’t want one image every 20 minutes, and you don’t want to have to stand right next to a potentially dangerous building.”
"This is meant for the urban war fighter … those situations where it's very stressful and it'd be great to know what's behind that wall."
Comments
Michael Seiler
Sat, 10/29/2011 11:24am
How about inventing a radar that can distinguish non-combattant civilians from combattants? It could help reduce what is so euphemistically referred to as "collateral damage."