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Radar is a term that comes from the acronym: Radio detecting and ranging ("detection and location by radio"). It is a system which, through the electromagnetic radiation to detect the location (location) or the speed of an object. The concept of radar is also used to refer to the device which applies this system.
Examples: "the radar detected an army aircraft suspect flying without permission on the river', «According to police radars, the car was travelling at 180 kms per hour», «airport has eight radars to control the circulation air.
The purpose of the radar is to emit electromagnetic waves which are reflected on the target and which are received in the same position of the transmitter. This kind of echo can handle a variety of information, such as distance, speed, altitude and direction of mobile or fixed/static objects.
The radars have multiple uses. They can be used by the military for the position and the movement of the different objectives; by the police to measure the speed of cars on a highway; the security of the airports to provide instructions/guidance to aircraft and to avoid collisions; by the captains of the ships to orient themselves on the sea; or by the meteorological service to detect precipitation (rain), among other uses.
It is possible to classify the radars in different ways according to different variables. Thus, one can speak of monostatic, bistatic and multistatic radar, continuous wave, wave pulsed, primary, secondary, monitoring or research, among others.