The original usage was RADAR since it is an acronym (RAdio Detection And Ranging) and people encountering it in written form may have thought it a typographical error were it not capitalized. But now...
What does radar what? What does it do? Weather radar scans layers of the atmosphere to find rain and storms. Rain or clouds will reflect the radar signal back to the transmitter, indicating a cloud...
Radar is an acronym for RAdio Detection and Ranging. It uses RF (Radio Frequencies) to detect and range a so called "Target". It is an active sensor which mean that it emits power (RF waves) which...
Radar sends out a radio wave and measures the reflected radio wave using it to calculate a target's speed, shape, material the object is made of, and direction of movement.