JED - April 2016 - 37

EW 101

Directed Energy Weapons

- Part 7

Typical HPRF Weapon Systems - cont'd
By Dave Adamy

ACTIVE DENIAL SYSTEM 2

The Active Denial System 2 (ADS2) is a portable version that
is enhanced and ruggedized. From open-source literature, the
system is basically like the vehicle-mounted ADS but more stable.
There are efforts to miniaturize ADS systems so that they can
be mounted in aircraft or vehicles. There are also programs to
develop hand-held ADSs which are described as "about the size
of a shot gun" and are intended for use by police in non-military
situations. These types of devices would obviously also be useful
in military applications, prisons, etc. These devices are compared
with Tasers, which are the current non-lethal devices in use.
There is much discussion about accountability issues. Police are
generally required to account for any cartridge they fire, but
the nature of the ADS would allow it to be used without leaving
any tell-tale evidence of its use or abuse.

Silent Guardian
Silent Guardian is a smaller (non-lethal) ADS that fires 2
second microwave energy bursts from a 45 x 45-inch antenna.
It is effective to 250 meters. It can target specific individuals
while supporting checkpoint security, embassy
protection, homeland security and peacekeeping
operations. It can go from
standby to armed mode in
less than two seconds and
can switch targets in the
same time period.

Vigilant Eagle
Vigilant Eagle is a
ground based system to
protect against surfaceto-air missiles at airfields
and airports. It detects
and tracks missiles with
a very low false-alarm rate
using distributed infrared
sensors. Then, a high-

power microwave beam is produced by an active electronically
scanned array antenna. The beam has a range of at least 100
km as shown in Figure 1. It penetrates the bodies of missiles
and destroys their processors and other electronics. Since there
are far fewer airfields than aircraft, this approach to missile
defense is far more economical than aircraft mounted defenses.

Electromagnetic Pulse
An electromagnetic pulse (EMP) is a short burst of electromagnetic energy. It can be a natural occurrence, such as
a lightning strike, or can be man-made. EMP is disruptive or
damaging to electronic equipment and at very high levels can
also create physical damage to buildings or aircraft. The short
duration of EMP energy bursts causes them to have a wide frequency spectrum. As shown in Figure 2, a typical EMP energy
waveform has a very sharp leading edge and decays more slowly.
It usually induces a corresponding signal in victim equipment.
EMP weapons can be nuclear or non-nuclear. Nuclear EMP
(NEMP) is the result of a nuclear explosion, and High-altitude
EMP (HEMP) produces a much larger pulse because of interaction
with the atmosphere and the Earth's magnetic field. There are
also non-nuclear EMP (NNEMP) weapons.
NEMP weapons, particularly HEMP weapons, cause destruction of electronic equipment over a very large area. A much
described scenario is an atomic weapon exploded at very high
altitude shutting down all of the electronics in a city or larger

Airport

100

km

Figure 1: A Vigilant Eagle system detects and destroys SAM threats out to 100 km around an airport.

The Journal of Electronic Defense | April 2016

L

ast month, we discussed the Active Denial System,
a vehicle mounted, non-lethal system designed to
move people out of an area. This month, we will
discuss a few other high-power radio frequency
(HPRF) systems.

37



JED - April 2016

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

The View From Here
Conferences Calendar
Courses Calendar
From the President
The Monitor
World Report
DARPA Profile: Advanced Materials
Mission Profile: Non-Kinetic Thinking Creates New Possibilities for Air and Missile Defense
Threat Monitor
EW 101
AOC News
Index of Advertisers
JED Quick Look
JED - April 2016 - cover1
JED - April 2016 - cover2
JED - April 2016 - 3
JED - April 2016 - 4
JED - April 2016 - 5
JED - April 2016 - The View From Here
JED - April 2016 - 7
JED - April 2016 - Conferences Calendar
JED - April 2016 - 9
JED - April 2016 - Courses Calendar
JED - April 2016 - 11
JED - April 2016 - From the President
JED - April 2016 - 13
JED - April 2016 - 14
JED - April 2016 - The Monitor
JED - April 2016 - 16
JED - April 2016 - 17
JED - April 2016 - 18
JED - April 2016 - 19
JED - April 2016 - 20
JED - April 2016 - 21
JED - April 2016 - 22
JED - April 2016 - World Report
JED - April 2016 - DARPA Profile: Advanced Materials
JED - April 2016 - 25
JED - April 2016 - 26
JED - April 2016 - 27
JED - April 2016 - Mission Profile: Non-Kinetic Thinking Creates New Possibilities for Air and Missile Defense
JED - April 2016 - 29
JED - April 2016 - 30
JED - April 2016 - 31
JED - April 2016 - 32
JED - April 2016 - 33
JED - April 2016 - 34
JED - April 2016 - Threat Monitor
JED - April 2016 - 36
JED - April 2016 - EW 101
JED - April 2016 - 38
JED - April 2016 - AOC News
JED - April 2016 - 40
JED - April 2016 - Index of Advertisers
JED - April 2016 - JED Quick Look
JED - April 2016 - cover3
JED - April 2016 - cover4
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