JED - MARCH 2016 - (Page 52)

EW 101 Directed Energy Weapons - Part 6 Typical HPRF Weapon Systems By Dave Adamy T his month and next, we will look at a few high power radio frequency (HPRF) systems, considering their applications, their technical parameters, their advantages and their shortcomings. The information in these two columns comes from several open literature reports on google. Active Denial System The Journal of Electronic Defense | March 2016 52 endure more than 5 seconds. The effects on targeted individuals can be to heat the whole body, make an intolerably hot spot on the skin, create what feels like a bee sting over the whole body, or create vibrations within the body. Picture a terrorist moving into an area surrounded by a coerced crowd of innocent civilians. Effectively applied, the ADS will break up the party in seconds. The ADS generator is a gyrotron, cooled by a closed-loop water cooling system. Its output can be set over the range 100 kW to 100 MW, and the power and beam duration are computer The active denial system (ADS) is a non-lethal HPRF system designed to cause people to move away from an area. Its applications include breaking up riots and preventing hostile people from approaching a vulnerable asset which they intend to damage or destroy. Figure 1 is a picture of the ADS mounted on a HUMVEE. Figure 2 is a functional diagram of the ADS and its target. The ADS operates at 95 GHz. It focuses a high power beam of radio frequency energy on human targets to increase their skin temperature to intolerable levels without killing them. This is very like what happens in a microwave oven, but since the oven operates at only 2.45 GHz, it penetrates 2/3 of an inch (1.2 cm) into the food being cooked. This is deep enough to transfer significant energy to the food over the extended time that the signal is present. Because of its significantly higher operating frequency, the ADS penetrates only 1/64 inch (0.4 mm) and is applied in 4 second bursts. This raises the skin temperature to painful levels without damaging deeper tissue, and the pain is gone very quickly when the beam is turned off or directed away from the targeted individual. People become extremely uncomfortable at a skin temperature of 111°F degrees F (44°C), get first degree burns at 124°F (51°C) and second degree burns (blisters) at 136°F (58°C). In ADS testing, most subjects experienced pain in 3 seconds and none of the subjects could Figure 1: The Active Denial System can be mounted on a Humvee. (USAF photo)

Table of Contents for the Digital Edition of JED - MARCH 2016

The View From Here
Conferences Calendar
Courses Calendar
From the President
The Monitor
Washington Report
World Report
Detecting Next-Generation Emitters
Technology Survey: TWTs and MPMs
SIGINT History
EW 101
AOC News
2016 AOC Industry Member Guide
Index of Advertisers
JED Quick Look

JED - MARCH 2016