Radar was secretly developed by several nations before and during world warII. the term radar was named in 1940 meaning radio detection and ranging.   Radar works by sending out radio waves and detecting any reflection from distant  object. Radar which is like seeing with radio waves. It had dozens of uses during ww2. It was used to aim search lights navigate ships to locate enemy ships and air crafts direct

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Gun fire navigate aircrafts and find bombing targets.  Active radar homing is a missile guidance method in In which a guided missile contains radar transverse to find its target. One example isa guided bomb called  the bat used by the United States Navy during ww2. Beginning in August 1944this bomb was almost 12 feet long and 10 feet