unmanned aerial vehicle
The UAV is an acronym for Unmanned Aerial Vehicle, which is
an aircraft with no pilot on board. UAVs can be remote
controlled aircraft (e.g. flown by a pilot at a ground control station) or can
fly autonomously based on pre-programmed flight plans or more complex dynamic
automation systems. UAVs are currently used for a number of missions, including
reconnaissance and attack roles. For the purposes of this article, and to
distinguish UAVs from missiles, a UAV is defined as being capable of
controlled, sustained level flight and powered by a jet or reciprocating
engine. In addition, a cruise missile can be considered to be a UAV, but is
treated separately on the basis that the vehicle is the weapon. The acronym UAV
has been expanded in some cases to UAVS (Unmanned
Aircraft Vehicle System). The FAA has adopted the acronym UAS(Unmanned
Aircraft System) to reflect the fact that these complex systems include
ground stations and other elements besides the actual air vehicles.
Officially,
the term 'Unmanned Aerial Vehicle' was changed to 'Unmanned Aircraft System' to
reflect the fact that these complex systems include ground stations and other
elements besides the actual air vehicles. The term UAS, however, is not widely
used as the term UAV has become part of the
modern lexicon.
The military role of UAV is growing at
unprecedented rates. In 2005, tactical and theater level unmanned aircraft (UA)
alone, had flown over 100,000 flight hours in support of Operation ENDURING
FREEDOM (OEF) and Operation IRAQI FREEDOM (OIF). Rapid advances in technology
are enabling more and more capability to be placed on smaller airframes which
is spurring a large increase in the number of SUAS being deployed on the
battlefield. The use of SUAS in combat is so new that no formal DoD wide
reporting procedures have been established to track SUAS flight hours.
Structure of the Lead：
who-not given
what- fly autonomously
where-not given
why-not given
How- a UAV is treated separately on the basis that the vehicle is the weapon.
When-not given
Keywords:
aircraft 飛機autonomously 自主地
reconnaissance 偵察
reciprocating 往復運動
Unmanned 無人
This invention was really a big step forward high technology. The unmanned aerial vehicles are not only used for passengers but are also used in military. They could spy on the enemy and inform us at once. But the unmanned aerial vehicles may cause other problems. Such as, if they loss control and hurt somebody, that will become a tragedy. It's hard to say whether they are safe or not, but we should be alert to "those airplanes."
回覆刪除The invention is very important in human history. The unmanned aerial vehicles can help us do something dangerous. And it is useful in military, too. It can be used to spot enemy instead of using soldiers. But if the unmanned aerial vehicles become uncontrolled, they may cause a great damage possibly.
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