(idiomatic) Without attracting notice; in an undetected or secretive manner.

any radar that is capable of estimating the position of a target based on the return of a single pulse from a cluster of simultaneous beams

A receive-only radar that uses ambient radio signals for search, tracking, surveillance, identification, guidance and mapping.

The application of radar to the study of the atmosphere, and to the observation and prediction of weather.

(astronomy) A technique that uses radar echoes to examine bodies within the solar system, obtaining information about size, shape, topography, surface density, spin etc.

A weatherproof enclosure used to protect a radar antenna.

A device designed to reflect radar waves well in order to make it clearly visible on radar screens. Radar reflectors can be installed for example in boats or signal buoys.

plural of radar dome

A hand-held (or mounted) device that emits a radar beam and uses the Doppler effect to measure the velocity of moving objects (especially traffic)

plural of radar reflector