Military UAV is an unmanned aircraft controlled and operated by remote control equipment or self-contained program. According to its control mode, it is mainly divided into three types: radio remote control, automatic program control and integrated control.

With the wide application of high and new technology in weapons and equipment, the research and development of UAV has made breakthrough progress, and has appeared frequently in several local wars, made meritorious achievements repeatedly, and has been highly praised by military people of various countries. It can be predicted that on the battlefield of the 21st century, people will face an increasing number of UAVs, and military UAVs will reshape the combat mode of the 21st century.

As a member of modern air military forces, military UAV has the characteristics of no casualties, less use restrictions, good concealment and high efficiency cost ratio. It plays an increasingly prominent role in modern wars and in recent local wars.

Military UAV has the characteristics of exquisite structure, strong concealment, convenient use, low cost and flexible performance. It is mainly used for battlefield reconnaissance, electronic jamming, carrying cluster bombs, guided missiles and other weapons to perform offensive tasks, as well as air communication relay platform, nuclear test sampler, nuclear explosion and nuclear radiation reconnaissance aircraft.

In future wars. High, medium and low altitude and long, medium and short-range military UAVs will perform various strategic and tactical tasks such as reconnaissance and early warning, tracking and positioning, special operations, relay communication, precision guidance, information confrontation, battlefield search and rescue. In the future, their military application scope and fields will continue to expand and expand.

Intelligence reconnaissance
The reconnaissance UAV realizes all-weather comprehensive reconnaissance capability by installing photoelectric, radar and other sensors. The reconnaissance methods are efficient and diverse. It can scan high-speed information over the battlefield, fly at low speed or hover and stare, providing real-time intelligence support for the army. UAV can go deep into the enemy's hinterland, get close to the enemy's signal radiation source as far as possible, and intercept important low-power short-range communication signals on the battlefield, with obvious advantages. High altitude long endurance strategic reconnaissance UAV flies over the reconnaissance target, replaces some functions of satellites, performs high-altitude reconnaissance missions, and takes clear ground pictures with high-resolution camera equipment, which is of great strategic significance. The portable UAV meets tactical tasks such as battlefield surveillance, target reconnaissance and damage assessment at the company and platoon level. In the Iraq war, the U.S. UAV provided 50% of the reconnaissance intelligence about the enemy's fixed and moving targets. The whole process of distributing and transmitting intelligence did not exceed 10 minutes.

Military strike
UAVs can carry a variety of precision attack weapons to attack ground and sea targets, or carry air-to-air missiles for air combat, as well as anti missile interception. The combat UAV carries the combat unit, finds important targets and carries out real-time attack, so as to realize the "combination of observation and attack". It can reduce casualties and improve the attack capability of troops. The combat UAV can be deployed forward in advance to intercept the tactical missile in the boost phase, and destroy the incoming missile at a long distance as an important air defense. The attack anti radiation UAV carries small and powerful precision guided weapons, laser weapons or anti radiation missiles to attack radar, communication command equipment, etc; Tactical Attack UAV can replace missile in some operational fields. Carry out a one-time attack on the enemy by means of suicide attack; The main combat attack UAV has large volume and fast speed. It can attack and air combat, attack and intercept ground and air targets. It is an important means to achieve global rapid strike capability. In NATO's air raid on Libya, it used "Predator" to launch "helfa" missiles to carry out air strikes on Libya, accurately hit ground targets, and fought with mi-25 fighters, becoming the first military UAV for direct air-to-air combat.

Information confrontation
Due to its unique advantages, on the battlefield, UAV can take off at any time in harsh environment, confront photoelectric information such as laser guidance, microwave communication, command network and complex electromagnetic environment, effectively block the attack, command and reconnaissance capabilities of enemy equipment, and improve its own information operation efficiency. The electronic countermeasure UAV reconnoiters and interferes with the command and communication system, ground radar and various electronic equipment, and supports the operations of various attack aircraft and bombers: the decoy UAV carries a radar echo intensifier or infrared simulator to simulate air targets, deceive enemy radars and missiles, entice enemy radars and other electronic reconnaissance equipment to start up, and lure enemy air defense weapons to fire, Cover the penetration of your own aircraft group; UAVs can also carry out psychological warfare by throwing propaganda materials and shouting at the enemy battlefield.

Communications Relay 
In future wars. Communication system is the lifeline of battlefield command and control, and it is also the focus of attack by both hostile sides. UAV communication network can establish powerful redundant backup communication links and improve survivability. After being attacked, the backup communication network can recover quickly and play an irreplaceable role in network centric warfare. High altitude long endurance UAV expands the communication distance, uses satellites to provide alternative links and directly links with land-based terminals to reduce the threat of physical attack and noise interference. The combat communication UAV adopts a variety of data transmission systems, the in line of sight analog data transmission system is adopted between each combat unit, and the over line of sight communication relay system is adopted with the satellite, which can transmit images, data and other information at high speed and in real time.

Logistic service
With the development of UAV technology. Its mission area has also been expanded. In recent years, the U.S. military has begun to explore the use of UAVs to undertake logistics support tasks such as material transportation, fuel supply and even evacuation of patients. When undertaking such tasks, UAV not only has the advantages of not being affected by complex terrain environment, high speed and avoiding ground enemy ambush, but also has the characteristics of low cost and simple operation. The K-MAX unmanned helicopter developed by American Kaman Airlines successfully completed the world's first UAV cargo mission in Afghanistan on December 17, 2011. At present, it has been deployed in Afghanistan for a long time.
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