by http://www.scientificamerican.com/article.cfm?id=laser-downs-uavs&sc=...
July 19, 2010 | 33 comments
U.S. Navy Laser Weapon Shoots Down Drones in Test [Video]
During a recent test, a Navy laser using a tracking system from Raytheon
shot down four unmanned aerial vehicles
By Larry Greenemeier
In a grainy, black-and-white video that looks like a home movie of a UFO
attack a sleek aircraft streaks through the sky one minute, only to burst
into flames the next and plummet into the sea. The silent video, which
Raytheon Co. debuts Monday at the U.K.'s Farnborough International Air Show
2010, however, is not science fiction. The defense contractor says it
depicts part of a test conducted in May during which the U.S. Navy used a
solid-state laser to shoot down unmanned aerial vehicles over the Pacific
Ocean.
During the test, the Navy's Laser Weapon System (LaWS), guided by Raytheon's
Phalanx Close-In Weapon System sensors, engaged and destroyed four UAV
targets flying over water near the Navy's weapons and training facility on
San Nicolas Island in California's Santa Barbara Channel, about 120
kilometers west of Los Angeles. The Phalanx-a rapid-fire,
computer-controlled, radar-guided gun system-used electro-optical tracking
and radio frequency sensors to provide range data to the LaWS, which is made
up of six solid-state lasers with an output of 32 kilowatts that
simultaneously focus on a target.
See video below
The maritime UAV target practice session could be a significant step in a
decades-long quest undertaken by the U.S. military and several defense
contractors to bring lasers to the battlefield. Raytheon's latest test
follows related experiments in 2006 and 2008. In the former, Raytheon used a
solid-state laser to destroy a static mortar, whereas in the latter, the
laser blew up an incoming mortar shell over land.
Knocking down drones over water is a different matter though. The effect of
the moist maritime environment on a laser's ability to propagate has been a
nagging question for the technology, says Mike Booen, vice president of
Raytheon's Advanced Security and Directed Energy Systems product line. Now
that the laser-enhanced Phalanx has demonstrated the ability to find and hit
incoming UAVs, the weapon will be installed on an operational Navy test ship
for additional testing, he adds. Still, even if the laser system continues
to test successfully, such a weapon would not be fully developed for combat
before 2016, according to Booen.
The U.S. military has used Phalanx for decades to shoot down mortars and
rockets. The weapon combines a 20-millimeter Gatling gun that fires at a
rate of either 3,000 or 4,500 shots per minute, with radar to search for and
track targets. The U.S. Navy has used a land-based version of Phalanx in
Iraq since 2005. Mounting a laser cannon beside the Gatling gun should
extend the range at which incoming ordinance and UAVs can be eliminated.
Although Booen says that for security reasons he cannot divulge the distance
at which the laser-based systems can shoot down incoming threats (or the
UAVs' altitudes during the Navy test), he notes that the military would not
be interested in the new laser technology if it could not at least double
the range of existing weapons.
A UAV's altitude depends largely on its design and its mission.
Hand-launched unmanned aircraft systems made by AeroVironment, Inc., for
example, typically operate at altitudes below 150 meters but are able to fly
much higher, according to Steve Gitlin, a spokesman for the Monrovia,
Calif.-based company. "[Altitude] is largely driven by the resolution of
their imaging sensors," he adds. Larger aircraft that AeroVironment and
others are developing are expected to be able to operate at upward of 16.5
kilometers.
Much of what the public knows about UAVs comes from news reports describing
how the U.S. and its allies use drones to attack enemy fighters as well as
incidents where civilians have been killed by unmanned aircraft. Booen
points out, however, that enemies of the U.S. and its allies are also using
UAVs either to attack troops or to track troop movements. Iran reportedly
has been doing this for years.
In addition to Raytheon's work, fellow defense contractor Northrop Grumman
plans to test its solid-state Maritime Laser Demonstration (MLD) system with
the Navy by the end of the year. For the at-sea demonstration, Northrop will
power its laser up to 15 kilowatts in order to defend against simulated
attacks of a Navy ship by smaller boats. A relatively low-power laser beam
could set alight wood or fiberglass hulls, fuel or vulnerable weapons from
stand-off distances of a kilometer or more, according to a May 14 Scientific
American article.
Navy planners are interested in using lasers in to help naval vessels fend
off potential attacks by squadrons of small boats, citing an incident that
occurred in early 2008 in the Strait of Hormuz (a waterway connecting the
Gulf of Oman and Persian Gulf). "The MLD system we are under contract to
build for [the U.S. Office of Naval Research] will be scalable to a variety
of power levels," according to Northrop spokesman Bob Bishop. "That means
that laser power can be added-or subtracted-to meet the level of response
necessary to address the threat, all within the same modular laser weapon
system."
The military hopes that, in addition to extending the range of their
weapons, lasers will also improve targeting precision. Another advantage,
Booen says, is that lasers require electricity rather than ordinance. As
long as there is current, the weapon will not run out of ammo.
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