= side-looking, adj.

Esp. in primary radar. Designating radar in which the transmitted signal is reflected by the target (in contrast to secondary radar, in which…

A secondary radar system, used for precision navigation and for distance measurement, in which an aircraft or ship determines its distance from…

Of a radar homing system, satellite, etc.: relying on radiation generated by the target or by some other system, rather than generating its own…

Radar. Designating or employing a mode of radar operation in which the direction (and usually also the range) of a target is precisely determined…

(a) back scattering; (b) the radiation scattered in this way; hence in Telecommunications (see quot. 1960); also attributive.

(of radar, lidar, etc.) having a single device serving as both transmitter and receiver.

Designating radar or sonar in which the beam is transmitted sideways and downwards, typically from an aircraft for the mapping of relief; relating…

Designating side-looking sonar and radar, esp. on a ship; relating to, employing, or derived from such a system. Cf. side-scanning, adj.

Originally U.S. Designating an airborne or satellite radar system designed to distinguish the radar signal of an airborne body situated between it…