Stealth technology , also termed low observable technology LO technology , is a sub-discipline of military tactics and passive and active electronic countermeasures ,  which covers a range of methods used to make personnel, aircraft , ships , submarines , missiles , satellites , and ground vehicles less visible ideally invisible to radar , infrared ,  sonar and other detection methods. It corresponds to military camouflage for these parts of the electromagnetic spectrum i. Development of modern stealth technologies in the United States began in ,   where earlier attempts to prevent radar tracking of its U-2 spy planes during the Cold War by the Soviet Union had been unsuccessful. Such changes to shape and surface composition comprise stealth technology as currently used on the Northrop Grumman B-2 Spirit "Stealth Bomber". The concept of stealth is to operate or hide while giving enemy forces no indication as to the presence of friendly forces.
Radar Detection: A Research of the Science, History, and Uses
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The history of radar where radar stands for RA dio D etection A nd R anging started with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell 's seminal work on electromagnetism. The development of systems able to produce short pulses of radio energy was the key advance that allowed modern radar systems to come into existence. By timing the pulses on an oscilloscope , the range could be determined and the direction of the antenna revealed the angular location of the targets. The two, combined, produced a "fix", locating the target relative to the antenna.
Sir Robert Alexander Watson-Watt created the first radar system in , but several other inventors have taken his original concept and have expounded and improved on it over the years. The question of who invented radar is a bit murky as a result. Many men had a hand in developing radar as we know it today. Born in in Brechin, Angus, Scotland and educated at St. In , he designed devices that could locate thunderstorms.