Active Missile Decoy System
NULKA Decoy is designed to lure incoming missiles away from surface ships.
and Canadian surface combatants have been fitted with NULKA.
manufactures the payload for the NULKA decoy and British Aerospace manufactures
NULKA is an active missile decoy system that provides effective all-weather
self-protection for naval vessels against anti-ship missiles.It
can be used as part of a multilayer defence system or for stand-alone
the threat is provided by the ship's electronic support measures system
or other equipment and NULKA uses this information to calculate the
optimum launch time and trajectory for the decoy.
The NULKA system
allows for automatic or operator designation of a missile threat and,
upon designation of a particular threat, will respond rapidly by launching
an autonomous airborne decoy. Prior to launch the system calculates
the optimum decoy flight trajectory for the mission and programmes that
trajectory data into the decoy's flight control unit.
With its programmable
and controllable flight path, the rocket hovers and positions itself
to provide a more attractive target for the threat missile.
The hovering rocket decoy air vehicle is held in a hermetically sealed
canister which acts as a lifetime storage container, as well as the
launch tube for the decoy. It is propelled by a solid fuel rocket motor.
Control of the decoy's
flight is achieved by a thrust control mechanism which acts on the motor's
efflux, and a spin control unit mounted on top of the decoy.
programming from the launcher processor, the decoy's flight trajectory
is determined by a digital flight control unit mounted immediately above
the rocket motor. The combination of thrust and flight control enables
successful launches to be made in severe sea state and high wind conditions.
The hovering flight
characteristics of the decoy vehicle permit the effective use of the
Sippican payload with wide area coverage, thus enabling one decoy to
counter multiple threats. Once launched, the decoy operates autonomously
and following its stored flight commands, moves away from the ship at
its preprogrammed height and speed to present an alternative and more
attractive target to incoming missiles.
As well as providing back-up for ships fitted with combat and fire-control
systems, the Fire-Control System (FCS) allows NULKA to be installed
and operated on ships not having these systems. The FCS accepts the
minimum input data required either automatically from the electronic
support measures system or manually from an operator. With its own processor,
the FCS manages the launching of decoys from multiple launchers located
around the ship.
In Australian service,
NULKA is to be fitted to `ANZAC' and `Adelaide' class frigates together
with (in the longer term) offshore patrol vessels.
British Aerospace Australia Ltd
the is system fitted on 4 x RAN FFGs (not yet on Syd and Adel), and
on HMAS WARRAMUNGA (so far) and 2 of the Canadian TRUMP Class (Iroquois
The decoy (Nulka)
is launched at a pre-determined time which is calculated upon the type
of threat (anti-ship missile) and its range.
The decoy then
launches to a point in space and decoys the missile away from the ship.
Each launcher holds
4 rounds, each round is inside a canister for environmental and screening
On the RAN and Canadian
ships the System consists of 1 Primary Fire Control Panel on the bridge,
1 Secondary FCP in the OPS room, and 4 launchers fed via 4 PPSs (Processor
Power Supply) units.
On the Canadian
and FFG ships there is also a unit called the RIM (Remote Interface
Module) which is basically the unit that interfaces between:
a. the UYK43 computer
and Synchro data on a FFG
b. the Canews EW
system on the Canadian ships
On ANZAC class the
system as described above, is interfaced to the C2 Combat Sys LAN via
SIUs (Standard Interface Units) which are essentially nodes on the combat
LAN. The RIM is not used.
Nulka Movie - Click
here for a picture image sequence of a Nulka Firing - (Windows