Radar is the transliteration of English Radar, derived from the abbreviation of radio detection and ranging, which means "radio detection and ranging", that is, using radio methods to find targets and determine their spatial positions. Therefore, radar is also called "radio positioning". Radar is an electronic device that uses electromagnetic waves to detect targets. The radar emits electromagnetic waves to illuminate the target and receives its echo, thereby obtaining information such as the distance from the target to the electromagnetic wave emission point, distance change rate (radial velocity), orientation, altitude and other information.
