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 Although the research aimed at tracking and disabling drones is at
an early stage, there has been at least one field test.
Last New Year's Eve, New York police used a microwave-based system
to try to track a commercially available drone at a packed Times
Square and send it back to its operator, according to one source
involved in the test.
The previously unreported test, which ran into difficulty because of
interference from nearby media broadcasts, was part of the
nationwide development effort that includes the Department of
Homeland Security, the Federal Aviation Administration and the
Defense Department, the source said.
The sources were not authorized to speak about the effort and
declined to be identified.
Asked about the development of counter-drone-technology, the
Department of Homeland Security said it "works side-by-side with our
interagency partners" to develop solutions to address the unlawful
use of drones. Officials with the Defense Department, FAA and New
York Police Department declined to comment.
 But the sources acknowledged that efforts to combat rogue drones
have gained new urgency due to the sharp rise in drone use and a
series of alarming incidents.
The number of unauthorized drone flights has surged over the past
year, raising concerns that one could hit a commercial aircraft
during landing or take-off, or be used as a weapon in a deliberate
attack, the sources said.
Drones have flown perilously close to airliners, interfered with
firefighting operations, been used to transport illegal drugs into
the United States from Mexico, and sparked a security scare at the
White House, among other incidents.
LIMITED POWERS
But U.S. authorities have limited tools for identifying drone
operators, many of them hobbyists, who violate federal rules that
drones fly no higher than 400 feet (120 meters) and no closer than 5
miles (8 km) to airports. One reason for the enforcement gap is that
Congress in 2012 barred the FAA from regulating recreational drones.
A system capable of disabling a drone and identifying its operator
would give law enforcement officials practical powers to block the
flights.
At crowded venues such as Times Square or the Super Bowl, police
want to be able to take control of a drone, steer it safely away
from the public and guide it back to the operators, who can then be
identified, the sources said.
A Reuters analysis of FAA data shows that authorities identified
operators in only one in 10 unauthorized drone sightings reported in
2014, while only 2 percent of the cases led to enforcement actions.
"We can’t shoot it out of the sky. We have to come up with something
that's kind of basic technology so that if something happens, the
drone or device will just go right back to the operators. It won't
crash," one of the sources said.
To do that, experts say that a drone needs to be tracked and
identified with a receiver and then targeted with an electromagnetic
signal strong enough to overwhelm its radio controls.
 “You need enough power to override the transmitter. If I just jam it
so it can’t receive signals, it’s probably going to crash. But if I
know the transmission codes the drone is using, I can control that
object,” said retired U.S. Marine Lieutenant Colonel Muddy Watters,
an electronic warfare expert.
Laws governing the use of drones have lagged their dramatic rise in
areas spanning agriculture, filming and recreational use.
Recreational drone operators are not required to register their
machines, obtain training or put identifying features on the
aircraft, making it extremely difficult for police to track down
rogue operators.
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FIRE-FIGHTING DISRUPTION, SECURITY SCARES
U.S. pilots have reported more than 650 drone sightings this year,
as of Aug. 9, well over double the 238 total for all of 2014, the
FAA said last week.
More than 1 million drones of all kinds are expected to be sold in
the United States this year, compared to 430,000 in 2014 and 120,000
in 2013, according to the Consumer Electronics Association.
In California, errant drones forced firefighters to suspend air
drops of water and fire retardant on wild fires this summer.
In January, a "quadcopter" drone landed on the White House lawn
after its operator lost control of the device in downtown
Washington. Federal officials decided not to bring criminal charges.
Police say their greatest fear is weaponization, as the advance of
drone technology enables the unmanned aerial vehicles (UAVs) to
travel farther and faster and carry larger payloads.
Guns can be fixed to drones and fired with relative ease, as
demonstrated in a popular video posted to YouTube by a Connecticut
teenager in July. The 15-second video, entitled “Flying Gun”, shows
a quadcopter hovering just above the ground in a wooded area and
jerking backward with each of four shots.
The case is under investigation by the FAA to determine whether the
drone violated aviation safety rules.
Safety and security concerns have prompted bipartisan discussions in
Congress about options that include federal support for jamming
drone systems and other potential technology solutions.
Senator Charles Schumer, a New York Democrat, proposed this week
that drone manufacturers be required to install technology capable
of preventing the unmanned aircraft from straying near “no fly”
areas such as airports.
Drone industry executives say that one possible solution is an
industry-wide agreement to include so-called “geo-fencing” software
in drones to prevent them from straying above the legal altitude or
too close to sensitive sites.
Chinese drone maker SZ DJI Technology Co Ltd, whose drone was
involved in the January crash on the White House grounds, has since
released a software fix that will restrict flights around sensitive
areas.
Federal authorities say they are also prepared to bring federal
criminal charges against rogue drone operators who violate FAA
restrictions.
(Additional reporting by David Alexander, Andrea Shalal and Doina
Chiacu; Editing by Soyoung Kim and Stuart Grudgings)
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