Raytheon AN/ALQ-99
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| Raytheon AN/ALQ-99 | |
|---|---|
| Name | AN/ALQ-99 |
| Manufacturer | Raytheon Technologies |
| Introduced | 1960s |
| Country | United States |
| Type | Tactical jamming system |
| Platform | Aircraft-mounted pods |
Raytheon AN/ALQ-99 is an airborne tactical electronic warfare system developed in the 1960s and fielded on multiple United States aircraft carriers and United States Navy platforms to provide airborne electronic attack. It was designed to support suppression of enemy air defenses on missions alongside EA-6B Prowler and later EA-18G Growler aircraft, integrating with sensors from AN/ALR-67-series and tactics from Joint Tactical Information Distribution System. The system influenced doctrine adopted by NATO, United States Air Force, and allied services during conflicts such as the Vietnam War, Gulf War, and operations over Iraq and Afghanistan.
Development and Design
The AN/ALQ-99 program began under contracts awarded to Raytheon and concurrent development with the Pratt & Whitney-powered airframes used for electronic attack, drawing on lessons from the EC-121 Warning Star and EB-66 Destroyer programs. Design work involved collaboration with the Naval Air Systems Command and the Office of Naval Research to produce removable underwing and fuselage pods carrying high-power transmitter modules, receiver/exciter assemblies, and threat libraries derived from signals collected by Defense Intelligence Agency and National Security Agency assets. Designers prioritized modularity to permit rapid swapping of tactical jamming components, align with maintenance cycles from Patuxent River Naval Air Station testing, and support interoperability with AN/APG radars and NATO electronic warfare doctrine.
Technical Specifications
The AN/ALQ-99 family comprises a transmitter pod, a receiver-exciter set, and a digital control unit integrating with onboard databus architectures standardized by MIL-STD-1553. Typical specifications include wide instantaneous bandwidth spanning VHF, UHF, and portions of the L-band to counter surface-to-air missile guidance and surveillance radars fielded by adversaries such as systems catalogued by Soviet Union and later Russian Federation inventories. The system produces high powered continuous wave and pulsed outputs, uses multiple power amplifier stages designed to NATO emission masks, and relies on cooled components similar to those developed for AN/ASQ-153 families. Avionics interface leveraged wiring harness standards used on Grumman and Boeing carrier-based aircraft, and maintainability employed line-replaceable units derived from MIL-STD-810 reliability requirements.
Variants and Modifications
Variants evolved to address new emitters collected by Signals Intelligence platforms and to meet requirements from Chief of Naval Operations directives. Upgrades included improved exciter suites, digital signal processing modules influenced by developments at MIT Lincoln Laboratory, and frequency-agile transmitters incorporating microprocessor boards from Honeywell subcontractors. Pod adaptations were made for carriage on training and testbeds at Edwards Air Force Base and for use in airborne electronic attack training ranges controlled by Navy Expeditionary Combat Command. Field modification kits responded to countermeasures deployed by forces during the Operation Desert Storm campaign.
Operational History
Operational employment began with deployment on Grumman EA-6B Prowler squadrons assigned to Carrier Air Wing operations in the Pacific and Mediterranean theaters, later transitioning to Boeing EA-18G Growler units in the 2000s. The system provided escort jamming, stand-off suppression, and escort support during strike packages over North Vietnam, the Persian Gulf, and Operation Iraqi Freedom. Tactics developed by squadrons at NAS Whidbey Island and lessons captured by Center for Naval Analyses influenced joint doctrine and training at Naval Strike and Air Warfare Center. Deployment stresses, maintenance demands, and combat performance were documented in after-action reviews by United States Pacific Command and United States Central Command.
Integration and Platforms
The AN/ALQ-99 was integrated onto platforms including the Grumman EA-6B Prowler, Boeing EA-18G Growler during transition periods, and testbed installations on Lockheed Martin F-16 prototypes and specialized drone controllers for training. Integration required avionics maps compatible with ASE suites, power supplies conforming to MIL-STD-704, and aerodynamic fairings assessed at NASA Langley Research Center wind tunnels. Carrier suitability certifications were overseen by Commander, Naval Air Forces and required interoperability trials with Aegis Combat System-equipped surface ships and airborne early warning assets like the Boeing E-2 Hawkeye.
Performance and Limitations
In service, the AN/ALQ-99 delivered effective broadband jamming against legacy radar families catalogued by Soviet Union and some post-Cold War systems, but limitations included high weight, substantial electromagnetic interference with onboard radios noted by Naval Aviation Warfighting Development Center, and maintenance-intensive transmitter units. Reliability issues and mean time between failures were focal points in reports by Congressional Research Service analysts and prompted operational workarounds during Operation Enduring Freedom. The system's analogue heritage constrained rapid software updates relative to modern digitized electronic attack suites developed by Northrop Grumman and other competitors.
Future Replacement and Modernization
Plans to replace the AN/ALQ-99 involved programs under Office of the Secretary of Defense oversight seeking next-generation airborne electronic attack systems incorporating active electronically scanned array transmitters, open-architecture mission systems compliant with Open Systems Architecture mandates, and stealthy low-observable integration influenced by Fifth-generation fighter development. Transition programs coordinated procurement between Naval Air Systems Command and industry teams including Raytheon Technologies, Northrop Grumman, and Boeing to field successors on EA-18G Growler airframes and potential unmanned platforms studied at DARPA and Naval Research Laboratory. Congressional budget cycles and threat assessments by Defense Intelligence Agency continue to shape timelines for full retirement and replacement.