JED - July 2014 - 50

EW 101

Electronic Warfare Decoys

Radar Decoys - Part 1
By Dave Adamy

T

The Journal of Electronic Defense | July 2014

50

he purpose of any decoy is to make a sensor
believe it is seeing something real. Of course, this
depends on the way that the sensor receives its
information. If the sensor is optical or thermal,
the decoy must create the proper optical image,
including size, shape and color (or wavelength).
For example, before the Normandy invasion in World War II,
fake facilities were built in locations that would make enemy
airborne photo reconnaissance conclude that the invasion was
to take place in Calais.
A radar identifies potential targets by analysis of the signals reflected from objects illuminated by its transmitter.
Thus, radar decoys must generate false returns that the radar
will decide are real targets.
In this series, we will discuss decoys in terms of their operational missions, the ways they generate false targets in the
radars they counter, and how they are deployed

MISSIONS OF DECOYS
There are three basic missions of radar decoys as shown in
table 1: saturation, seduction and detection.
Saturation decoys, as shown in Figure 1, create many false
targets that look enough like real targets to force the radar to
expend time and processing resources to distinguish real from

false targets. Ideally, the radar will be unable to make this
differentiation and must therefore expend many weapons in
order to destroy the few targets among the many false targets.
Even if the decoy cannot completely fool the sensor, it should
be difficult enough to differentiate that the detection process
is significantly slowed. The mission of the decoys is thus to
saturate the enemy's information throughput so that there will
not be time during an engagement to defend against an attack.
In this case, the decoys must look enough like real targets to
fool the radar to some level. The radar's analysis capabilities
dictate the necessary decoy features - the more sophisticated
the radar processing, the more complex the decoys must be.
Seduction decoys are placed within a radar's resolution cell
along with a real target that is being defended, as shown in
Figure 2. The resolution cell is the volume in which the radar
cannot determine whether a single target or multiple targets
are present. The cell is shown in two dimensions for simplicity,
but is actually a three dimensional volume. In this mission, the
decoy must look more like the target than the target does. To
be successful, the seduction decoy must "seduce" the radar's
tracking circuits away from the real target to itself. Now, the
radar is tracking the decoy rather than its intended target,
and the radar will center its resolution cell on the decoy. As
the decoy moves away from the protected target, it takes the

Decoy
Movement
Relative to Target

Figure 1: Saturation decoys create many false targets to overload the
capability of an adversary radar or the weapons it controls.

Figure 2: A seduction decoy "seduces" the tracking of a radar away from
its intended target and leads it to another location.



JED - July 2014

Table of Contents for the Digital Edition of JED - July 2014

The View From Here
Conferences Calendar
Courses Calendar
From the President
The Monitor
Washington Report
World Report
The Art of Fusion – Ew and Radar for Fighter Aircraft
EPAWSS: F-15 Ew Upgrade Ready to Launch
Technology Survey: Airborne Ir Decoys and Dispensers
EW 101
New Products
AOC Election Guide
AOC News
Index of Advertisers
JED Quick Look
JED - July 2014 - cover1
JED - July 2014 - cover2
JED - July 2014 - 3
JED - July 2014 - 4
JED - July 2014 - 5
JED - July 2014 - The View From Here
JED - July 2014 - 7
JED - July 2014 - Conferences Calendar
JED - July 2014 - 9
JED - July 2014 - Courses Calendar
JED - July 2014 - 11
JED - July 2014 - From the President
JED - July 2014 - 13
JED - July 2014 - 14
JED - July 2014 - The Monitor
JED - July 2014 - 16
JED - July 2014 - 17
JED - July 2014 - 18
JED - July 2014 - 19
JED - July 2014 - 20
JED - July 2014 - 21
JED - July 2014 - 22
JED - July 2014 - 23
JED - July 2014 - Washington Report
JED - July 2014 - 25
JED - July 2014 - World Report
JED - July 2014 - 27
JED - July 2014 - The Art of Fusion – Ew and Radar for Fighter Aircraft
JED - July 2014 - 29
JED - July 2014 - 30
JED - July 2014 - 31
JED - July 2014 - 32
JED - July 2014 - 33
JED - July 2014 - 34
JED - July 2014 - 35
JED - July 2014 - 36
JED - July 2014 - 37
JED - July 2014 - EPAWSS: F-15 Ew Upgrade Ready to Launch
JED - July 2014 - 39
JED - July 2014 - 40
JED - July 2014 - 41
JED - July 2014 - 42
JED - July 2014 - Technology Survey: Airborne Ir Decoys and Dispensers
JED - July 2014 - 44
JED - July 2014 - 45
JED - July 2014 - 46
JED - July 2014 - 47
JED - July 2014 - 48
JED - July 2014 - 49
JED - July 2014 - EW 101
JED - July 2014 - 51
JED - July 2014 - 52
JED - July 2014 - New Products
JED - July 2014 - 54
JED - July 2014 - AOC Election Guide
JED - July 2014 - 56
JED - July 2014 - 57
JED - July 2014 - 58
JED - July 2014 - 59
JED - July 2014 - 60
JED - July 2014 - 61
JED - July 2014 - 62
JED - July 2014 - AOC News
JED - July 2014 - 64
JED - July 2014 - Index of Advertisers
JED - July 2014 - JED Quick Look
JED - July 2014 - cover3
JED - July 2014 - cover4
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