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Radar It is a term that comes from an English acronym: Radio detecting and ranging("Radio detection and location" ). It's about a system which, through electromagnetic radiation, allows to detect the location or the speed of an object. The notion of radar is also used to name the device that applies this system.

For example: "The army radar detected a suspicious plane flying without authorization over the Baptist River", "According to police radar, the car was traveling at 180 kilometers per hour", "The airport has eight radars to control air traffic".

What radar does is emit waves electromagnetic which are reflected in the objective and are received in the same position of the issuer. That kind of echo allows to process various information, such as distances, speeds, altitudes and addresses of mobile or static objects.

Radars can be classified using a wide variety of criteria for this. Thus, for example, among the most significant proposals are the following:
• If the waveform is taken into account, they can be divided into three groups: continuous wave with modulation, continuous wave and pulsed wave.
• In the case that the number of antennas is considered, they can be classified into three types: multistatic, monostatic and bistatic.

Radars have multiple uses. They can be used by armed forces to know the position and movements of various targets; by policeman to measure the speed with which cars circulate through a highway ; by Airport security to give directions to the planes and avoid collisions; by the captain of a ship to guide you on the high seas; or for him meteorologic service to detect precipitation, among other uses.

At present, the type of radar that is most commonly used and that affects the population on foot is the radar that is used to carry out what are the speed controls. In Spain the DGT (Directorate General of Traffic) is responsible for proceeding to establish these radars by the different provinces.

However, it must be said that these radars have "enemies." And in order to prevent drivers from being fined, apps have even emerged that warn where the corresponding traffic radars are located.

It is possible to classify the radar in many other ways according to other variables. This way we can talk about secondary, tracking or search radars, among others.

We cannot ignore that, as a result of the advancement of social networks, so-called social radars have been shaped. Basically these are the mechanisms that can be used to know the follow-up that an event, character or element is having. Thus, for example, we could point out that those known as Twitter evengs serve to know when a television program is having repercussion and follow-up.

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