secondary radar

secondary radar

[′sek·ən‚der·ē ′rā‚där]
(electronics)
Radar which receives pulses transmitted by an interrogator and makes a return transmission (usually on a different frequency) by its transponder, as opposed to a primary radar which receives pulses returned from illuminated objects.

secondary radar

A radar system wherein a radio signal transmitted from the radar station initiates the transmission of a radio signal from another station (ICAO). Examples of secondary radars are IFF (identification friend or foe) and secondary surveillance radar. See identification friend or foe.
References in periodicals archive ?
Its MSSR 2000 I secondary radar is deployed for military friend-or-foe identification by the US and NATO allied countries all over the world.
They lost contact at 8.16pm The report says: "The wreckage was found about 30 metres from the position of the last secondary radar point."
TIS-A is an older ground-based system that relies on the Mode S radar system (secondary radar surveillance) and is found in some approach control airspace.
By 1126:15, the time of the last secondary radar return, the airplane had descended from 1800 to 1100 feet msl and leveled off momentarily every 100 feet between 1500 and 1100 feet.
Primary radar detects all aircraft in its range without the need for aircraft co-operation, while enhanced mode secondary radar selectively interrogates each of them to obtain an answer with precise identification and other relevant data, such as its course and altitude.
Founded in 2007, Cambridge Pixel is a developer of sensor processing and display solutions including primary and secondary radar interfacing, processing and display components for military and commercial radar applications.
The two major methods used to track planes are primary radar and secondary radar. Primary radar - one of the earliest methods of tracking, uses radio signals, which are constantly being emitted by the plane.
Transponders work on secondary radar, allowing ATC to observe both altitudes and squawk codes.
Online discussion among pilots has centred on unconfirmed secondary radar data from Malaysia that suggested the aircraft was climbing at a speed of 353 knots, about 100 knots too slow, and that it might have stalled.
Online discussions among pilots centred on unconfirmed secondary radar data from Malaysia that suggested the missing plane was climbing at a speed of 353 knots, about 100 knots too slow in such weather conditions.
2- Supply and installation of primary and secondary radar systems in Salalah Airport at RO 5,723,280.
At 1:21am secondary radar blipped MH370 in its last confirmed position, crossing the navigational waypoint known as IGARI in the Gulf of Thailand.

Full browser ?