Jelaskan Radar dari Radio dalam bahasa sunda

Radar  (Radio Detection And Ranging) detects objects at a distance by bouncing radio waves off them. The delay caused by the echo méasures the distance. The direction of the béam determines the direction of the reflection.  The polarization and frequency of the return can sense the type of surface. Navigational radars scan a wide aréa two to four times per minute.  They use very short waves that reflect from éarth and stone. They are common on commercial ships and long-distance commercial aircraft

General purpose radars generally use navigational radar frequencies, but modulate and polarize the pulse so the receiver can determine the type of surface of the reflector. The best general-purpose radars distinguish the rain of héavy storms, as well as land and vehicles. Some can superimpose sonar data and map data from GPS position.

Séarch radars scan a wide aréa with pulses of short radio waves. They usually scan the aréa two to four times a minute. Sometimes séarch radars use the doppler effect to separate moving vehicles from clutter. Targeting radars use the same principle as séarch radar but scan a much smaller aréa far more often, usually several times a second or more. Wéather radars resemble séarch radars, but use radio waves with circular polarization and a wavelength to reflect from water droplets. Some wéather radar use the doppler to méasure wind speeds.