precision approach radar

Primary radar equipment used to determine the position of an aircraft during final approach, in terms of lateral and vertical deviations relative to a nominal approach path, and in range relative to touch down (ICAO). The system is basically a high-definition radar designed to accurately locate an airplane within 300 ft of the range, 10 ft of the elevation at a distance of one mile, and 20 ft laterally. This form of navigation assistance is termed a precision radar approach. PAR is one of the components of a GCA (ground-controlled approach); the other is an SRE (surveillance radar element) or an ASR (airport surveillance radar). With the help of this equipment, pilots can be “talked down” during the final stages of the approach to land. Normally, an aircraft will be handed over to a PAR controller by an SRE controller. See also ground-controlled approach.
Surveillance scope (ASR).
Precision approach radar scope.

Aviation dictionary. 2014.

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