Radar
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Radar
Radar (/'reɪ.dɑːr/), an acronym for Radio Detection and Ranging, is a detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.
Etymology
The term radar was coined in 1940 by the United States Navy as an acronym for Radio Detection And Ranging.
Related Terms
- Radio wave: A type of electromagnetic wave, as are microwaves, infrared radiation, X-rays, and gamma-rays. Radio waves have the longest wavelength in the electromagnetic spectrum.
- Detection: The action or process of identifying the presence of something concealed.
- Ranging: The action or process of measuring the distance from one point to another.
- Electromagnetic spectrum: The range of wavelengths or frequencies over which electromagnetic radiation extends.
- Wavelength: The distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
- Frequency: The rate at which something occurs or is repeated over a particular period of time or in a given sample.
See Also
- Sonar: A system for the detection of objects under water and for measuring the water's depth by emitting sound pulses and detecting or measuring their return after being reflected.
- Lidar: A method for measuring distances by illuminating the target with laser light and measuring the reflection with a sensor.
External links
- Medical encyclopedia article on Radar
- Wikipedia's article - Radar
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