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AMR-June-July-2013

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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

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