Researchers make progress spotting suicide vests at standoff distances.

• Author: Magnuson, Stew
• Position: Homeland Security News

One of the Department of Homeland Security's 12 academic centers of excellence is seeking to adapt millimeter wave technology currently used at airport screening stations to detect suicide bombers at standoff distances.

Person-borne improvised explosive devices, which are shaped from a variety of metals and concealed under clothing, are difficult to detect. Airport-style scanners and pat-downs are of limited value, given that a detonation could still claim many victims.

DHS' Science and Technology Directorate wants to stop suicide bombers before they reach their intended target.

"For the suicide bomber problem we need a high performance radar system that can send out very specific types of signals a half a football field away and identify specific features under clothing," Carey Rappaport, professor of electrical and computer engineering at Northeastern University, said in a statement. Northeastern is the location of the ALERT Center, an acronym that stands for Awareness and Localization of Explosives Related Threats. This center of excellence focuses on the detection, mitigation and response to explosives-related threats.

The center ultimately selected a millimeter wave based system as the best available technology, said Rappaport. Millimeter waves are a subset of the microwave band, which in turn is part of the larger radio wave band. These waves operate within a frequency range of 30 to 300 GHz. Unlike X-rays, millimeter-waves are non-ionizing and universally considered non-carcinogenic. They don't have the bad reputation of the backscatter detectors that the Transportation Security Administration recently pulled from airports.

Once an exotic technology only used by the military, millimeter wave hardware is now coming down in price, Rappaport said. HX1, a supplier of millimeter-wave products, components and sub-systems, is providing radar modules for the project.

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