AWG-9

AWG-9
Name	AWG-9
Type	Pulse-Doppler fire-control radar
Country	United States
Manufacturer	Hughes Aircraft Company
Designed	1960s
Production	1969–1980s
Number built	~700
Frequency	X band
Range	>100 nautical miles (vs. bomber-sized targets)
Diameter	36-inch planar array antenna
Power	High (exact figure classified)
Altitude	Look-down/shoot-down capability

AWG-9. The AN/AWG-9 was a long-range, X band pulse-Doppler radar and weapon control system developed by the Hughes Aircraft Company for the United States Navy. It was the central sensor of the F-14 Tomcat's air intercept system, famed for its ability to track up to 24 targets and guide multiple AIM-54 Phoenix long-range air-to-air missiles simultaneously. The system's unprecedented power and look-down/shoot-down capability were critical to the Fleet Air Defense mission during the Cold War, providing the U.S. Navy with a decisive advantage against potential threats from Soviet bomber aircraft and cruise missiles.

Development and history

The AWG-9's origins trace to the ambitious, and ultimately canceled, F-111B program, a naval variant of the General Dynamics F-111 Aardvark developed under the TFX program. Hughes Aircraft Company was tasked with creating a revolutionary radar and missile system to fulfill the Navy's requirement for a long-range fleet defense interceptor. Following the termination of the F-111B in 1968, the advanced AWG-9 system was transferred to the new Grumman F-14 Tomcat airframe. Key figures in its development included engineers at Hughes Aircraft Company and program managers within the Department of Defense. The system entered service with VF-1 "Wolfpack" in 1974 aboard the USS *Enterprise* (CVN-65).

Technical specifications

The AWG-9 operated in the X band frequency range and utilized a powerful traveling-wave tube amplifier. Its most distinctive physical component was a large, 36-inch diameter planar array antenna housed in the F-14 Tomcat's distinctive nose radome. The system integrated several modes: a long-range pulse-Doppler search and track mode, a shorter-range continuous wave illumination mode for guiding semi-active radar homing missiles like the AIM-7 Sparrow, and a infrared search and track (IRST) capability. It was directly linked to the AIM-54 Phoenix missile's active radar homing seeker, enabling launch-and-leave engagements. The radar's signal processor and avionics were cooled by a dedicated liquid cooling system.

Operational use

The AWG-9 was deployed exclusively aboard the Grumman F-14 Tomcat with the United States Navy and the Imperial Iranian Air Force. In American service, it was a cornerstone of Carrier Air Wing operations from the 1970s through the 1990s, providing carrier battle groups with an unmatched outer air battle capability. The system saw no combat use with the U.S. Navy in its primary long-range role, though its track-while-scan capabilities were utilized during encounters with Libyan aircraft over the Gulf of Sidra. The Imperial Iranian Air Force reportedly used the system in combat during the Iran–Iraq War. Its operational doctrine was deeply integrated with the E-2 Hawkeye and the Naval Tactical Data System.

Capabilities and performance

The AWG-9's most celebrated capability was its ability to track up to 24 airborne targets at ranges exceeding 100 nautical miles and simultaneously guide up to six AIM-54 Phoenix missiles against six separate threats. Its high-power output and advanced pulse-Doppler processing granted a robust look-down/shoot-down ability, allowing it to detect and engage low-flying targets against heavy ground clutter—a critical feature against cruise missile threats like the AS-4 Kitchen. In testing, the system and AIM-54 Phoenix combination achieved successful intercepts at ranges over 100 miles. The system's Track while scan mode allowed the F-14 crew, the Naval Flight Officer and pilot, to maintain situational awareness while prosecuting engagements.

Variants and upgrades

The primary upgrade to the AWG-9 was the AN/APG-71 radar developed for the F-14D Super Tomcat. The AN/APG-71 retained the AWG-9's antenna and transmitter but incorporated modern digital signal processing derived from the F-15 Eagle's AN/APG-70 radar, offering improved reliability, electronic counter-countermeasures (ECCM), and a higher-resolution synthetic aperture radar ground mapping mode. Other evolutionary improvements to the AWG-9 fleet included software updates and compatibility with newer weapons like the AIM-120 AMRAAM, though the F-14 community primarily relied on the AIM-54 Phoenix and AIM-7 Sparrow. No direct export variants beyond the systems sold to Iran were produced.

Legacy and influence

The AWG-9 established the technological paradigm for long-range, multi-target engagement capabilities in naval aviation. Its direct successor, the AN/APG-71, carried its legacy into the late 1990s. The system's requirements and operational concepts heavily influenced later developments like the AN/APG-77 of the F-22 Raptor and the AN/APG-81 of the F-35 Lightning II, particularly in multi-target tracking and sensor fusion. The retirement of the F-14 Tomcat and its unique weapon system ended an era of dedicated fleet defense interceptors in the U.S. Navy, with its role absorbed by the Aegis Combat System on *Ticonderoga*-class cruisers and networked engagements by aircraft like the F/A-18E/F Super Hornet.

Category:Avionics Category:Radar Category:United States Navy avionics