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Airfield Surveillance Radar ASR-9

ASR-9
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Figure 1: ASR-9 Tower
(© MIT Lincoln Laboratory

Manufacturer: Westinghouse Electronics, (now: Northrop Grumman Corporation Electronic Sensors and Systems Division, Baltimore, Maryland)

The Northrop Grumman ASR-9 is an advanced radar system, which has been operational at 135 U.S. locations and was the first airport surveillance radar to display weather and aircraft simultaneously. The first installation began in 1989 and was completed in 1995.

ASR-9 Tower
(© MIT Lincoln Laboratory)

Figure 2: Equiped with different beacon ASR-9 antenna

The ASR-9 combines circular polarisation with moving target detection for vastly improved aircraft detection in weather. A separate weather channel generates six weather levels, any two of which may be selected at one time by the controller. For detection of small targets in severe clutter, the ASR-9 employs a dual-beam antenna (Transmit in low beam only), advanced digital processing, sophisticated constant false alarm rate circuitry, and a scan-to-scan tracker. A clutter processor with a fine grain clutter map enhances returns from tangentially flying aircraft.

The system is completely unattended, incorporating a remote maintenance and monitoring system, and has a dual-channel mean time between failure of over 3,500 hours. Should a fault occur, a built-in test detects and isolates the problem, a capability that can be controlled from a central facility. Redundancy has also been incorporated in the antenna subsystem by the use of dual- drive motors and dual- azimuth pulse generators.

ASR-9 Tower © Northrop Grumman

Figure 3: ASR-9 antenna mounted on a tower

Beschreibung des Radargerätes; ausgewählte Taktisch-technische Daten
Description of the radar set, tactical-technical characteristics
Description de l'unité de radar, les caractéristiques techniques tactique
Radar birimi, taktik-teknik özellikleri açıklaması
Описание; Основные тактико-технические характеристики (Базы данных)

Specifications
frequency: 2.7 to 2.9 Gigahertzes
pulse repetition time (PRT):  
pulse repetition frequency (PRF): 325 to 1200 pulses per second
pulsewidth (τ): 1 microsecond
receive time:  
dead time:  
peak power: 1.3 Mwgawatt
average power:  
displayed range: up to 60 nautical miles
range resolution: 450 ft
beamwidth: 1.4 degrees
hits per scan:  
antenna rotation: 12.5 rpm

Publisher: Christian Wolff
Text is available under the GNU Free Documentation License, and the
Creative Commons Attribution-Share Alike 3.0 Unported license, additional terms may apply.