JED - July 2014 - 51

E W101

Anti-radiation
Missle

resolution cell with it. When the resolution cell no longer contains the real target, the weapon being guided by the radar will
be guided to the decoy.
Detection decoys look enough like real targets to cause the
radar to acquire and track them. When a radar is searching
for targets, a false target can cause the radar to perform the
decoy's design function. If the radar is a dedicated acquisition radar, the target will be passed to a tracking radar. As
we will discuss later, the operating philosophy in a groundbased air defense network is now normally "hide, shoot, and
scoot," in order to limit an enemy's ability to geolocate radar

PASSIVE AND ACTIVE RADAR DECOYS
A passive decoy creates a radar cross section physically. Obviously, if the decoy is the same size, shape and material as the
real target it is simulating, it will have the same radar cross
section. However, there are ways that a decoy can make itself
look larger. One common technique is to incorporate a pattern
of corner reflectors. A corner reflector produces a radar cross
section significantly larger than its actual size. The formula
for the radar cross section of a corner reflector with circular
edges as shown in Figure 4 is:
= (15.59 L 4) / λ2
Where: s is the radar cross section in square meters
L is the length of a side
λ is the wavelength of the illuminating signal
If the side is one half meter, and the illuminating signal is
at 10 GHz (i.e., the wavelength is 3 cm), the radar cross section
is 1,083 square meters.

SIMULATED
RADAR RETURN

L
AMP

RADAR SIGNAL
4
2

Figure 4: A corner reflector can generate a radar cross section much
larger than its physical size.

Figure 5: An active decoy creates a large radar cross section by
amplifying and rebroadcasting signals received from a target radar.

The Journal of Electronic Defense | July 2014

Figure 3: A detection decoy causes an acquisition radar to acquire the decoy, often requiring
that a tracking radar be activated. This allows the tracking radar to be targeted by an antiradiation missile.

and communications emissions. That
is, radars remain off the air as long as
possible before launching weapons and
then move away from their launching
locations as quickly as possible. If a radar decoy looks like a credible target,
an enemy will be forced to bring up its
tracking radars. As shown in Figure 3,
these tracking radars can be attacked
by antiradiation missiles or precision
guided munitions.
Later in this series, we will deal with
evolving capabilities of modern radars
that require decoys to generate very detailed radar cross sections to make them
look like credible potential targets.

51



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
https://www.nxtbook.com/naylor/JEDM/JEDM0318
https://www.nxtbook.com/naylor/JEDM/JEDM0218
https://www.nxtbook.com/naylor/JEDM/JEDM0118
https://www.nxtbook.com/naylor/JEDM/JEDM1217
https://www.nxtbook.com/naylor/JEDM/JEDM1117
https://www.nxtbook.com/naylor/JEDM/JEDM1017
https://www.nxtbook.com/naylor/JEDM/JEDM0917
https://www.nxtbook.com/naylor/JEDM/JEDM0817
https://www.nxtbook.com/naylor/JEDM/JEDM0717
https://www.nxtbook.com/naylor/JEDM/JEDM0617
https://www.nxtbook.com/naylor/JEDM/JEDM0517
https://www.nxtbook.com/naylor/JEDM/JEDM0417
https://www.nxtbook.com/naylor/JEDM/JEDM0317
https://www.nxtbook.com/naylor/JEDM/JEDM0217
https://www.nxtbook.com/naylor/JEDM/JEDM0117
https://www.nxtbook.com/naylor/JEDM/JEDM1216
https://www.nxtbook.com/naylor/JEDM/JEDM1116
https://www.nxtbook.com/naylor/JEDM/JEDM1016
https://www.nxtbook.com/naylor/JEDM/JEDM0916
https://www.nxtbook.com/naylor/JEDM/JEDM0816
https://www.nxtbook.com/naylor/JEDM/JEDM0716
https://www.nxtbook.com/naylor/JEDM/JEDM0616
https://www.nxtbook.com/naylor/JEDM/JEDM0516
https://www.nxtbook.com/naylor/JEDM/JEDM0416
https://www.nxtbook.com/naylor/JEDM/JEDM0316
https://www.nxtbook.com/naylor/JEDM/JEDM0216
https://www.nxtbook.com/naylor/JEDM/JEDM0116
https://www.nxtbook.com/naylor/JEDM/JEDM1215
https://www.nxtbook.com/naylor/JEDM/JEDM1115
https://www.nxtbook.com/naylor/JEDM/JEDM1015
https://www.nxtbook.com/naylor/JEDM/JEDM0915
https://www.nxtbook.com/naylor/JEDM/JEDM0815
https://www.nxtbook.com/naylor/JEDM/JEDM0715
https://www.nxtbook.com/naylor/JEDM/JEDM0615
https://www.nxtbook.com/naylor/JEDM/JEDM0515
https://www.nxtbook.com/naylor/JEDM/JEDM0415
https://www.nxtbook.com/naylor/JEDM/JEDM0315
https://www.nxtbook.com/naylor/JEDM/JEDM0215
https://www.nxtbook.com/naylor/JEDM/JEDM0115
https://www.nxtbook.com/naylor/JEDM/JEDM1214
https://www.nxtbook.com/naylor/JEDM/JEDM1114
https://www.nxtbook.com/naylor/JEDM/JEDM1014
https://www.nxtbook.com/naylor/JEDM/JEDM0914
https://www.nxtbook.com/naylor/JEDM/JEDM0814
https://www.nxtbook.com/naylor/JEDM/JEDM0714
https://www.nxtbook.com/naylor/JEDM/JEDM0614
https://www.nxtbook.com/naylor/JEDM/JEDM0514
https://www.nxtbook.com/naylor/JEDM/JEDM0414
https://www.nxtbook.com/naylor/JEDM/JEDM0314
https://www.nxtbook.com/naylor/JEDM/JEDM0214
https://www.nxtbook.com/naylor/JEDM/JEDM0114
https://www.nxtbook.com/naylor/JEDM/JEDM1213
https://www.nxtbook.com/naylor/JEDM/JEDM1113
https://www.nxtbook.com/naylor/JEDM/JEDM1013
https://www.nxtbook.com/naylor/JEDM/JEDM0913
https://www.nxtbook.com/naylor/JEDM/JEDM0813
https://www.nxtbook.com/naylor/JEDM/JEDM0713
https://www.nxtbook.com/naylor/JEDM/JEDM0613
https://www.nxtbook.com/naylor/JEDM/JEDM0513
https://www.nxtbook.com/naylor/JEDM/JEDM0413
https://www.nxtbook.com/naylor/JEDM/JEDM0313
https://www.nxtbook.com/nxtbooks/naylor/JEDM0213
https://www.nxtbook.com/nxtbooks/naylor/JEDM0113
https://www.nxtbook.com/nxtbooks/naylor/JEDM1212
https://www.nxtbook.com/nxtbooks/naylor/JEDM1112
https://www.nxtbook.com/nxtbooks/naylor/JEDM1012
https://www.nxtbook.com/nxtbooks/naylor/JEDM0912
https://www.nxtbook.com/nxtbooks/naylor/JEDM0812
https://www.nxtbook.com/nxtbooks/naylor/JEDM0712
https://www.nxtbook.com/nxtbooks/naylor/JEDM0612
https://www.nxtbook.com/nxtbooks/naylor/JEDM0512
https://www.nxtbook.com/nxtbooks/naylor/JEDM0412
https://www.nxtbook.com/nxtbooks/naylor/JEDM0312
https://www.nxtbook.com/nxtbooks/naylor/JEDM0212
https://www.nxtbook.com/nxtbooks/naylor/JEDM0112
https://www.nxtbook.com/nxtbooks/naylor/JEDM1211
https://www.nxtbook.com/nxtbooks/naylor/JEDM1111
https://www.nxtbook.com/nxtbooks/naylor/JEDM1011
https://www.nxtbook.com/nxtbooks/naylor/JEDM0911
https://www.nxtbook.com/nxtbooks/naylor/JEDM0811
https://www.nxtbook.com/nxtbooks/naylor/JEDM0711
https://www.nxtbook.com/nxtbooks/naylor/JEDM0611
https://www.nxtbook.com/nxtbooks/naylor/JEDM0511
https://www.nxtbook.com/nxtbooks/naylor/JEDM0411
https://www.nxtbook.com/nxtbooks/naylor/JEDM0311
https://www.nxtbook.com/nxtbooks/naylor/JEDM0211
https://www.nxtbook.com/nxtbooks/naylor/JEDM0111
https://www.nxtbook.com/nxtbooks/naylor/JEDM1210
https://www.nxtbook.com/nxtbooks/naylor/JEDM1110
https://www.nxtbook.com/nxtbooks/naylor/JEDM1010
https://www.nxtbook.com/nxtbooks/naylor/JEDM0910
https://www.nxtbook.com/nxtbooks/naylor/JEDM0810
https://www.nxtbook.com/nxtbooks/naylor/JEDM0710
https://www.nxtbook.com/nxtbooks/naylor/JEDM0610
https://www.nxtbook.com/nxtbooks/naylor/JEDM0510
https://www.nxtbook.com/nxtbooks/naylor/JEDM0410
https://www.nxtbook.com/nxtbooks/naylor/JEDM0310
https://www.nxtbook.com/nxtbooks/naylor/JEDM0210
https://www.nxtbook.com/nxtbooks/naylor/JEDM0110
https://www.nxtbook.com/nxtbooks/naylor/JEDM1209
https://www.nxtbook.com/nxtbooks/naylor/JEDM1109
https://www.nxtbook.com/nxtbooks/naylor/JEDM1009
https://www.nxtbook.com/nxtbooks/naylor/JEDM0909
https://www.nxtbook.com/nxtbooks/naylor/JEDM0809
https://www.nxtbook.com/nxtbooks/naylor/JEDM0709
https://www.nxtbook.com/nxtbooks/naylor/JEDM0609
https://www.nxtbook.com/nxtbooks/naylor/JEDM0509
https://www.nxtbook.com/nxtbooks/naylor/JEDM0409
https://www.nxtbook.com/nxtbooks/naylor/JEDM0309
https://www.nxtbook.com/nxtbooks/naylor/JEDM0209
https://www.nxtbook.com/nxtbooks/naylor/JEDM0109
https://www.nxtbook.com/nxtbooks/naylor/JEDM0908
https://www.nxtbookmedia.com