The so-called “Active Denial System” works by heating the outer surface of the target’s skin using millimeter waves — short wavelength microwaves. The effect is painful, but generally harmless, and forces the target to get out of the beam. Recently, it’s been proposed as a possible defense against pirates; last month, Raytheon gave a presentation on Active Denial at a NATO workshop on anti-pirate equipment and technologies.
This presentation mentions an “Impending Direct Commercial Sale” of a commercial version of the Active Denial system known as Silent Guardian (pictured). This is Active Denial in a box, a 10,000-pound containerized system that can be mounted on a ship, a truck, or a fixed installation. It’s got an effective range of about 250 meters. The beam has a power of around 30 kilowatts.
The anti-pirate presentation shows how a set-up with two antennas could achieve almost 360-degree coverage for a small container ship.
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