precision approach radar

Also found in: Acronyms, Wikipedia.

precision approach radar

[prə′sizh·ən ə¦prōch ′rā‚där]
A radar system located on an airfield for observation of the position of an aircraft with respect to an approach path, and specifically intended to provide guidance to the aircraft during its approach to the field; the system consists of a ground radar equipment which is alternately connected to two antenna systems; one antenna system sweeps a narrow beam over a 20° sector in the horizontal plane; the second sweeps a narrow beam over a 7° sector in the vertical plane; course correction is transmitted to the aircraft from the ground. Abbreviated PAR.

precision approach radar (PAR)

precision approach radar (PAR)
Surveillance scope (ASR).
precision approach radar (PAR)
Precision approach radar scope.
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.
References in periodicals archive ?
The Army's new AN/FPN-67 fixed based precision approach radar provides the US Army air traffic controllers with a proven, cost-effective tool that provides accurate and reliable aircraft position information to aid in the landing operations in adverse weather and low visibility conditions.
Designated the AN/TPN-31 by the US Army, the system comprises an S-band air surveillance radar, L-band secondary surveillance radar/identification friend or foe system, X-band precision approach radar and air traffic management system.
Communications and Information Technology company Harris Corporation (NYSE: HRS) announced on Tuesday that it has received an eight-year, USD96m ceiling, single-award IDIQ contract from the US Naval Air Systems Command (NAVAIR) to supply precision approach radars (PAR) to the US Navy, Air Force and Army.
announced that it has been awarded a contract to provide Mobile Approach Control System Precision Approach Radars (MACS PAR) to the US Air Force.

Full browser ?