JED - October 2016 - 38


seeker. Time is also very important
during the terminal phase of the engagement; seduction rounds bloom
extremely fast.
A variant of seduction mode is
sometimes referred to as "dump
mode." As Dave Adamy explains in
his book, EW104: Electronic Warfare
Against a New Generation of Threats, in
dump mode, a decoy (a chaff round or
an active decoy) is deployed close to
the ship but outside the threat radar's
resolution cell. Once the decoy is deployed, the ship's deception jammer
moves the radar's tracking centroid
onto the decoy.

IR Decoys
Some ASMs have dual-mode (RF
and IR) seekers, and they use their
IR seekers for terminal guidance and
to reject chaff and other types of RF
countermeasures. For these types of
threats, ships can deploy IR decoys
(in coordination with chaff decoys),
as well as dual-payload decoys that

carry chaff and IR decoy materials.
Some IR decoy rounds can also provide an IR "screening" effect, which
is useful when an adversary is using
IR search and track sensors or laser-guided threats.
In an ASM attack, IR decoys are
usually deployed anywhere from 50
meters to 600 meters from the ship
and activate at altitudes around 50100 meters above the surface. Depending on the type of payload, the
IR decoy can provide an IR screen
to prevent target acquisition and/
or seduce the IR missile seeker away
from the ship. Some IR decoy rounds
deploy point source flares (some
use small parachutes to maximize
their "hang time") to seduce the
missile away from the ship. If the
ASM has locked onto the ship, some
seduction IR decoys use a "walk off"
technique by activating multiple
submunitions in a timed sequence
to lure the threat away from the
ship. - J. Knowles

The Journal of Electronic Defense | October 2016

38

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ture and test of a production-representative "Bravo" model.
Comprising 12 vertically-stowed barrels on a rotating plinth, the Centurion
launcher trains on to the appropriate
bearing and then depresses the selected
launcher barrel to the desired firing angle
(as determined by the system firing algorithms). A faceted low RCS cover structure features 12 individual panels, each
designed to depress in unison with its
associated barrel. The electro-mechanical
launcher assembly itself is designed to
weigh less than 1,200 kg and occupy a
deck footprint of less than 1.3 meters.
Response time is less than three
seconds from the stowed position, with
positional accuracy maintained through
compensation for ship movement. This,
in combination with the latest variable-range decoy rounds, should allow
payload placement to be accurately controlled in three axes so as to provide improved ship-signature replication.
Another claimed advantage of the
design is that it allows munitions to be
fired at a far wider range of elevations.
For example, higher angles of elevation
(up to 70º) offer improved protection
against high-dive attacks, while launch
at lower ballistic elevations will reduce
the time of flight for distraction payloads by many seconds. The low angle
of launch also generates significantly
improved IR capability.
Centurion can operate as a stand-alone
system controlled from an operator panel
located in the operations room, or can be
fully integrated into the ship's combat
management system.  The data interface
with the rounds within the launcher allows round identification to be undertaken and pre-flight information passed
automatically to the selected round.
Chemring Countermeasures has developed a variable range 130-mm seduction round using six submunition
payloads (chaff, IR, obscurants or combinations thereof), and a rocket-powered large payload carrier (a 130-mm
to 170-mm flared round) for deploying
distraction payloads (either chaff or
corner reflectors). Its objective is that
the combination of a trainable launcher
and smart algorithms should optimize
the inherent capability within these advanced countermeasures. a

2016-09-14 2:56 PM


http://www.nordengroup.com

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

The View From Here
Conferences Calendar
Courses Calendar
From the President
The Monitor
World Report
Bait in the Trap: Trainable Soft-Kill Systems Proliferate for ASMD
2017 EW/SIGINT Resource Guide
SIGINT History
EW 101
AOC News
Index to Advertisers
JED Quick Look
JED - October 2016 - cover1
JED - October 2016 - cover2
JED - October 2016 - 3
JED - October 2016 - 4
JED - October 2016 - 5
JED - October 2016 - The View From Here
JED - October 2016 - 7
JED - October 2016 - Conferences Calendar
JED - October 2016 - 9
JED - October 2016 - Courses Calendar
JED - October 2016 - 11
JED - October 2016 - From the President
JED - October 2016 - 13
JED - October 2016 - 14
JED - October 2016 - The Monitor
JED - October 2016 - insert1
JED - October 2016 - insert2
JED - October 2016 - 16
JED - October 2016 - 17
JED - October 2016 - 18
JED - October 2016 - 19
JED - October 2016 - 20
JED - October 2016 - 21
JED - October 2016 - World Report
JED - October 2016 - 23
JED - October 2016 - Bait in the Trap: Trainable Soft-Kill Systems Proliferate for ASMD
JED - October 2016 - 25
JED - October 2016 - 26
JED - October 2016 - 27
JED - October 2016 - 28
JED - October 2016 - 29
JED - October 2016 - 30
JED - October 2016 - 31
JED - October 2016 - 32
JED - October 2016 - 33
JED - October 2016 - 34
JED - October 2016 - 35
JED - October 2016 - 36
JED - October 2016 - 37
JED - October 2016 - 38
JED - October 2016 - 39
JED - October 2016 - 2017 EW/SIGINT Resource Guide
JED - October 2016 - 41
JED - October 2016 - 42
JED - October 2016 - 43
JED - October 2016 - 44
JED - October 2016 - 45
JED - October 2016 - 46
JED - October 2016 - 47
JED - October 2016 - 48
JED - October 2016 - 49
JED - October 2016 - 50
JED - October 2016 - 51
JED - October 2016 - 52
JED - October 2016 - 53
JED - October 2016 - 54
JED - October 2016 - 55
JED - October 2016 - 56
JED - October 2016 - 57
JED - October 2016 - 58
JED - October 2016 - 59
JED - October 2016 - 60
JED - October 2016 - 61
JED - October 2016 - 62
JED - October 2016 - 63
JED - October 2016 - 64
JED - October 2016 - SIGINT History
JED - October 2016 - 66
JED - October 2016 - 67
JED - October 2016 - EW 101
JED - October 2016 - 69
JED - October 2016 - AOC News
JED - October 2016 - 71
JED - October 2016 - Index to Advertisers
JED - October 2016 - 73
JED - October 2016 - JED Quick Look
JED - October 2016 - cover3
JED - October 2016 - cover4
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