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RADAR Radio Detection And Ranging
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RADAR Radio Detection And Ranging

Radio Detection And Ranging ,in short RADAR relies on sending and receiving electromagnetic radiation, usually in the form of radio waves (see Radio) or microwaves. Electromagnetic radiation is energy that moves in waves at or near the speed of light. The characteristics of electromagnetic waves depend on their wavelength. Gamma rays and X rays have very short wavelengths.

Visible light is a tiny slice of the electromagnetic spectrum with wavelengths longer than X rays, but shorter than microwaves. Radar systems use long-wavelength electromagnetic radiation in the microwave and radio ranges. Because of their long wavelengths, radio waves and microwaves tend to reflect better than shorter wavelength radiation, which tends to scatter or be absorbed before it gets to the target. Radio waves at the long-wavelength end of the spectrum will even reflect off of the atmosphereâ„¢s ionosphere, a layer of electrically-charged particles in the earthâ„¢s atmosphere.

The challenges for radar are stealth technology,clutter,jamming. It has certain applications like the traffic control,maritime navigation,millitary safety,air traffic control,meteorology etc.
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