Our task is clear we need
 a way to safely detect explosive
threats on people and in their bags and
 we have to this without physically
searching them or impacting their flow
 through the transit system.
The Surface Transportation Explosive
 Threat Detection Program is working in
collaboration with the surface transportation
 system end users and our stateholders
as well as our partners at Johns Hopkins
 applied physics laboratory and MIT
Lincoln lab to close the surface transportation
 security gap through innovative
technologies designed to work together
 and provide a layed approach to security
throughout the transportation system.
 We're also investing in standoff threat dedection
systems using complementary parts
 of the electromagnetic system.
These systems will serve as a key component
 of the layered screening concept.
This is the Centimeter Wave Array that
 we're developing here at
APL as apart of our layered threat detection
 approach. These
would be incorporated into the walls
 you would be going down a hallway,
people can just walk in front of this, this
 images them but at
such a blurry level that most people would
 not consider this to be particularity invasive. 
Its only the very large things, that you
 know, hey that looks like a rife, that looks like
an explosive. So that an operator will
 see the people walking by the array
and the large false colored red blob that
 says he's concealing something.
The power and the frequencies we're emitting
 are the same as put out by your
wifi. This will not harm you in any way.
These are lower then exposures that you
 will get from your own cellphone.
Our concept is use a low-cost system
 like a centimeter wave system
as the initial layer of defence identifying
 potential items of interest.
Then we can use a millimeter wave system
 as our next layer providing a more detailed
view of potential threat items. Both layers
 working in a safe way that
maintains the traveling publics privacy.
This system is a prototype standoff microwave
 imager. Its a panel that's placed on a wall. 
or a corridor or perhaps on the ceiling,
 the idea here 
is that if you come into proximity of the unit
 with a concealed bomb or rifle 
its going to be able to see it. Microwave
 sensing can complement FOVEA
by providing information that FOVEA doesnt have.
 So you can immagine
a scenario where FOVEA alerts us to the fact
 that somebody has
dropped a bag and walked away.
 Now if that's all we know, we don't kknow
if the bags empty, or weather we need
 to call in a bomb tech to check things out.
Microwave sensing can tell us if the
 bag is empty or its full of metal. 
Or perhaps if it has some other suspicious
 item inside. That will allow us to
tailor our response to save resources,
 save time and keep everybody safe.
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