Plain English Meaning

A type of radar that uses very short radio waves to 'see' the runway and surroundings through fog, haze, or darkness, and shows the result on a cockpit display so the pilot can fly the approach.

Full Definition

A short-wavelength radar sensor operating in the millimeter-wave portion of the radio spectrum (roughly 30–300 GHz) used in some Enhanced Flight Vision Systems to detect runway features, terrain, and obstacles in low-visibility conditions and present them on the pilot's display.

Context Anchor

Seen in discussions of Enhanced Flight Vision Systems (EFVS) used during and - operations.