Secondary surveillance radar

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Term secondary surveillance radar
Status


Mandatory for


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Related entries

Air Traffic Control Radar Beacon System

Broader term


Narrower term


Abbreviation

SSR

Definition

A surveillance radar system which uses transmitters/receivers (interrogators) and transponders.

Definition Source

ICAO Official definition, ANNEX 10/IV Aeronautical Telecommunications — Surveillance Radar and Collision Avoidance Systems

Note

Secondary surveillance radar (SSR), which had its beginnings in wartime Identification Friend or Foe (IFF) systems, transmits pulses of energy which trigger a response from an airborne transponder, with range and bearing obtained in the same way as primary radar. (source: ICAO, "APOSI Airports International" 1993, April, p. 28 [TF-ATM])