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| APY-9 | |
|---|---|
| Name | APY-9 |
| Caption | Surveillance radar system |
| Country | United States |
| Designer | Northrop Grumman |
| Introduced | 2013 |
| Type | AESA airborne radar |
| Frequency | S band |
| Platform | E-2D Advanced Hawkeye |
| Status | In service |
APY-9 is an airborne, mechanically scanned electronically steered array surveillance radar developed for carrier-based airborne early warning and control missions. It provides long-range detection, tracking, and surveillance capabilities for naval task forces and integrates with airborne command, control, and battle management systems. The system emphasizes wide-area surveillance, maritime domain awareness, and high-clutter tracking in littoral and open-ocean environments.
The radar originated from a modernization effort led by Northrop Grumman to replace legacy systems on the E-2 family and align with requirements from United States Navy acquisition programs. Development involved collaboration with contractors and stakeholders including Raytheon Technologies, Lockheed Martin, and naval laboratories such as the Office of Naval Research and Naval Air Systems Command. Design milestones referenced lessons from systems like the AN/APY-2, AN/APY-7, and cooperative programs with allies including Royal Navy and Japan Maritime Self-Defense Force. Airworthiness and integration testing proceeded through evaluations at Patuxent River Naval Air Station and live trials aboard USS Harry S. Truman (CVN-75), guided by doctrine from U.S. Pacific Fleet and U.S. Fleet Forces Command.
The APY-9 combines mechanically rotating assemblies with electronically scanned array elements to balance coverage and beam agility, influenced by research from Massachusetts Institute of Technology and the Naval Research Laboratory. System architecture uses open-systems principles promoted by Defense Advanced Research Projects Agency initiatives and interoperability frameworks championed by North Atlantic Treaty Organization standards.
APY-9 employs active electronically scanned array (AESA) technology operating primarily in the S band, with multi-mode waveforms for surveillance, track-while-scan, and synthetic aperture modes. Antenna sizing and rotation rates were derived from studies involving MIT Lincoln Laboratory, Johns Hopkins University Applied Physics Laboratory, and modeling used by DARPA programs. Key performance attributes include long-range detection comparable to surveillance radars like the AN/APY-2, ability to detect low-observable targets discussed in analyses by Center for Strategic and International Studies, and high-resolution maritime imaging akin to systems featured in NATO demonstrations.
Signal processing chains utilize technologies from firms such as IBM and NVIDIA for real-time filtering, with algorithms developed in partnership with Carnegie Mellon University and Stanford University research groups. Electronic counter-countermeasures draw on concepts implemented in programs from Defense Information Systems Agency and doctrinal testing by United States Naval Test Pilot School.
Initial operational test and evaluation phases involved deployments with Carrier Air Wing 7 and operational assessments aligned with training at Naval Air Station Norfolk and deployments to regions patrolled by U.S. Sixth Fleet and U.S. Seventh Fleet. APY-9-equipped aircraft participated in exercises such as RIMPAC, Malabar, and bilateral engagements with Japan Maritime Self-Defense Force and Royal Australian Navy units. Data from early deployments informed tactics developed by Commander, Naval Air Forces and integration pathways with command structures like U.S. European Command.
Operational feedback emphasized enhanced situational awareness in congested littoral zones, interoperability with airborne assets such as the Boeing P-8 Poseidon and carrier strike groups including USS Theodore Roosevelt (CVN-71), and contributions to tasking for surface action groups and strike packages coordinated with United States Central Command.
Primary integration occurred on the Northrop Grumman E-2D Advanced Hawkeye, leveraging the aircraft’s mission systems stack and avionics suites produced by companies like Honeywell and Rockwell Collins. Cross-platform data-links supported connectivity with platforms including the Boeing F/A-18E/F Super Hornet, EA-18G Growler, and command nodes like the Aegis Combat System aboard Arleigh Burke-class destroyer vessels. Network-centric interoperability used standards such as those promoted by Multinational Interoperability Council and link protocols consistent with Link 16 implementations overseen by NATO and Joint Chiefs of Staff planners.
Integration required avionics certification coordinated with Federal Aviation Administration standards for carrier operations and testing with organizations like Naval Air Systems Command and Fleet Readiness Center Atlantic.
Planned and fielded upgrades included software-defined enhancements, incremental hardware refreshes, and interoperability expansions coordinated with Program Executive Office for Air ASW, Assault & Special Mission Programs (PEO(A)) and Naval Air Systems Command. Upgrade paths referenced open architecture mandates from Department of Defense guidance and drew on modular designs seen in other programs such as those by Raytheon for air-surveillance radars. Potential variants considered multicore processing boosts from Intel and GPU acceleration from NVIDIA, as well as maritime-surveillance add-ons inspired by systems used by the French Navy and Italian Navy.
Primary operator is the United States Navy aboard carrierborne squadrons equipped with the E-2D. Collaborative deployments and information exchanges have occurred with partner navies including the Japan Maritime Self-Defense Force, Royal Australian Navy, Royal Navy, and participants in multinational exercises like RIMPAC and Malabar.
Operational reports included scrutiny over cost growth in modernization programs tracked by Government Accountability Office reviews and acquisition oversight by Congressional Budget Office staff. Debates among stakeholders in hearings held by the Senate Armed Services Committee and House Armed Services Committee addressed lifecycle costs, schedule slippages, and trade-offs between capability and procurement quantity. Technical concerns raised during testing were evaluated by Naval Air Systems Command and independent assessments from think tanks such as RAND Corporation and Center for Strategic and Budgetary Assessments.
Category:Radars