AMR-June-July-2013
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
C L O S E<br />
A I R<br />
S U P P O R T<br />
ance kits and spare parts, and to provide<br />
repair and sustainment services as part of<br />
a $99.9 million contract awarded by the<br />
United States Department of Defense on<br />
15th March. The contract will run until<br />
January 2016, and includes the supply of<br />
JDAM kits for a foreign customer,<br />
although the identity of this buyer is not<br />
being revealed.<br />
The JDAM architecture is built around<br />
a GPS kit and the weapon can achieve a<br />
stand-off range of circa 28 kilometres (15<br />
nautical miles). The rationale behind the<br />
development of JDAM was to provide a<br />
precision weapon which would not be<br />
adversely affected by battlefield obscurants<br />
such as smoke and moisture in the<br />
air unlike laser-guided bombs. One of the<br />
key attractions of JDAM has been its cost<br />
with the price tag for guidance kits being<br />
around $27,000 per unit. This compares<br />
very favorably to other precision strike<br />
systems on the market such as the<br />
Raytheon BGM-109C/D Tomahawk Land<br />
Attack Missile.<br />
Throughout its service life, the JDAM<br />
family has been progressively upgraded.<br />
This has included the addition of a laser<br />
seeker to provide a choice of guidance<br />
options realized via the Precision Laser<br />
Guidance Set (PLGS) initiative developed<br />
by Boeing in partnership with Israel’s<br />
Elbit Systems. Contracts followed for this<br />
weapon in 2007 with Boeing delivering<br />
400 laser seekers to the United States Air<br />
Force and 200 to the Navy. The laser-guided<br />
variant of the JDAM is known as the<br />
GBU-54 LJDAM (Laser JDAM). It made its<br />
first appearance in combat in August<br />
2008, successfully destroying a moving<br />
vehicle. Full rate production of the GBU-<br />
54 LJDAM commenced in September<br />
2012, with Boeing currently building 2,300<br />
bomb guidance kits. Export sales<br />
occurred, notably to Germany, which has<br />
become the first customer for the weapon<br />
signing a contract with Boeing for its supply<br />
in <strong>July</strong> 2008. Alongside its fulfillment<br />
of this contract, Boeing has been involved<br />
in the provision of anti-jamming kits to<br />
augment the weapon.<br />
In addition to the GBU-54 LJDAM,<br />
other variants of this weapon are under<br />
development. In 2009, it was announced<br />
that Boeing was developing the extended<br />
range JDAM-ER. This will have a reach of<br />
80km (43nm) albeit with no degradation<br />
in accuracy. Moreover, the price of this<br />
weapon is expected to be lower at circa<br />
$10,000 per unit. Production of the JDAM-<br />
ER is expected to commence in 2015.<br />
42<br />
Small Diameter Bomb<br />
One perennial concern with any PGM is<br />
the size of the bomb’s warhead. Although<br />
accuracy has steadily improved over the<br />
years, concerns regarding collateral damage<br />
have resulted in design engineers<br />
evolving weapons with comparatively<br />
small explosive loads. This allows the<br />
bomb to detonate destroying the target<br />
while reducing damage to the surrounding<br />
area. This is particularly relevant<br />
when CAS is being performed in a builtup<br />
environment.<br />
Designated as the GBU-53B Small<br />
Diameter Bomb-II (SDB-II) and produced<br />
by Raytheon, the 114kg (250lb) weapon<br />
reaches its target using GPS, laser,<br />
Millimeter Wave (MMW) radar and Infra-<br />
Red (IR) guidance. When the weapon is<br />
released small wings pop out of its body<br />
giving it a standoff range of 22km (40nm),<br />
although as the weapon is un-powered,<br />
this will vary according to launching altitude.<br />
The four distinct guidance modes are<br />
intended to provide the user with a large<br />
number of targeting options. The semiactive<br />
laser ensures pin-point accuracy,<br />
while the MMW radar allows the detecl<br />
ASIAN MILITARY REVIEW<br />
l