radar

(noun)

A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of sent radio waves (usually microwaves) reflected from their surfaces.

Related Terms

  • thermal agitation
  • terahertz radiation

Examples of radar in the following topics:

  • Microwaves

    • This frequency range is used for most radar transmitters, microwave ovens, wireless LANs, cell phones, satellite communication, microwave radio relay links, and numerous short range terrestrial data links.
    • Radar, first developed in World War II, is a common application of microwaves.
    • By detecting and timing microwave echoes, radar systems can determine the distance to objects as diverse as clouds and aircraft.
    • A Doppler shift in the radar echo can determine the speed of a car or the intensity of a rainstorm.
    • Sophisticated radar systems can map the Earth and other planets, with a resolution limited by wavelength.
  • Antennae

    • These include: radio broadcasting, broadcast television, two-way radio, communications receivers, radar, cell phones, and satellite communications; as well as other devices such as garage door openers, wireless microphones, bluetooth enabled devices, wireless computer networks, baby monitors, and RFID tags on merchandise.
  • The Production of Electromagnetic Waves

    • ., light) and used in modern technology—AM and FM radio, cordless and cellular phones, garage door openers, wireless networks, radar, microwave ovens, etc.
  • Turbulence Explained

    • Another method of detecting this type of turbulence is ultrasound, used as a medical indicator in a process analogous to Doppler-shift radar (used to detect storms).
  • The Nuclear Arms Race

    • Both superpowers built large radar arrays to detect incoming bombers and missiles.
  • Examples and Applications

    • The magnetron has practical applications in radar, heating (as the primary component of a microwave oven), and lighting.
  • Radio Waves

    • Artificially generated radio waves are used for fixed and mobile radio communication, broadcasting, radar and other navigation systems, communications satellites, computer networks and innumerable other applications.
  • Power

    • Even the most cogent and valuable statement may slip under a business reader's radar the first time it appears.
  • The Battle of the Atlantic

    • By spring 1943, the British had also developed an effective sea-scanning radar small enough to be carried in patrol aircraft armed with airborne depth charges.
  • Conclusion: WWII and the U.S.

    • Additionally, radar had been developed during the war.
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