AN/APS-115

AN/APS-115
Name	AN/APS-115
Country	United States
Type	Airborne maritime surveillance radar
Introduced	1970s
Manufacturer	Litton Industries

AN/APS-115 is an airborne maritime surveillance radar developed in the United States for anti-submarine warfare and surface-search roles. It evolved from earlier airborne radar efforts to support naval aviation, carrier operations, and coalition task forces. The radar was integrated onto patrol aircraft and contributed to search and reconnaissance missions alongside platforms from NATO and allied services.

Development and Design

The radar traces its lineage through a series of programs involving Naval Air Systems Command, Litton Industries, General Dynamics, Raytheon, and contractors tied to Lockheed Corporation platforms. Design work referenced systems fielded during the Korean War and the Vietnam War to meet requirements set by Commander, U.S. Pacific Fleet and Commander, U.S. Atlantic Fleet. Engineers worked with standards from North Atlantic Treaty Organization interoperability initiatives and consulted with Naval Research Laboratory scientists. The program incorporated lessons from projects overseen by Secretary of the Navy offices and testing at Patuxent River and Naval Air Station Jacksonville facilities. Development milestones intersected with procurement decisions influenced by the Defense Appropriations Act and congressional oversight committees.

Technical Specifications

The radar used pulse-Doppler and surface-search techniques refined after the era of systems like those aboard P-3 Orion aircraft. Frequency bands, antenna arrays, and signal processing modules evolved with contributions from teams at Massachusetts Institute of Technology's Lincoln Laboratory and industrial partners such as Hughes Aircraft Company. The system architecture reflected advances also present in avionics suites from Martin Marietta and sensor fusion efforts associated with Office of Naval Research programs. Test instrumentation and acceptance trials involved personnel trained under curricula from Naval Air Training Command and engineers formerly associated with Grumman Corporation.

Operational Use and Platforms

Operators integrated the radar into maritime patrol platforms including aircraft produced by Lockheed Corporation, modifications managed by Sikorsky Aircraft-affiliated facilities, and avionics upgrades coordinated with Northrop Grumman. Crews from Fleet Air Reconnaissance Squadron units, squadrons assigned to Carrier Air Wing groups, and detachments under Allied Forces Southern Europe employed the system during deployments. Missions coordinated with commands such as U.S. Fleet Forces Command and multinational exercises involving Royal Australian Air Force, Royal Air Force, and Canadian Forces maritime units. Installation and logistic support involved depots at Naval Air Station Whidbey Island and Marine Corps Air Station Kaneohe Bay.

Variants and Upgrades

Over its service life, the radar received upgrades comparable to modernization efforts seen in programs supported by Defense Advanced Research Projects Agency and procurement offices under Under Secretary of Defense for Acquisition. Upgraded signal processors paralleled developments adopted in systems for E-2 Hawkeye, and software revisions mirrored efforts at Johns Hopkins University Applied Physics Laboratory. Field modifications and retrofit kits were distributed through programs connected to Naval Air Systems Command and depot-level maintenance overseen by Naval Air Station North Island logistics. Collaborative initiatives included technology transfer with defense contractors like BAE Systems and integration testing alongside sensors from Thales Group.

Performance and Capabilities

Performance characteristics enabled long-range surface-search, contact tracking, and cueing for anti-surface and anti-submarine weapons consistent with mission sets defined by Chief of Naval Operations priorities. Capabilities included maritime surveillance, search-and-rescue support during operations coordinated with United States Coast Guard, and littoral monitoring in theaters related to Gulf of Aden and Strait of Hormuz security operations. Interoperability allowed data sharing with command elements at United States Central Command and allied maritime coordination centers such as those linked to NATO Allied Maritime Command.

Combat History and Notable Deployments

The radar saw deployment on patrols during periods of heightened tension such as operations during the Cold War, regional contingencies tied to the Iran–Iraq War era disruptions to shipping, and later counter-piracy and maritime interdiction missions in areas like the Horn of Africa. It participated indirectly in tasking associated with carrier strike groups operating from USS Nimitz (CVN-68) and other capital ships, and in multinational exercises including events hosted by RIMPAC and NATO Exercise Ocean Venture. Crews utilizing the radar supported real-world operations coordinated with commanders at United States European Command and United States Pacific Command.

Category:Airborne radars Category:United States military equipment