BAE Systems to provide land- and sea- VME identification-friend-or-foe (IFF) interrogators for air defense

June 13, 2023
The AN/UPX-50(C) digital IFF interrogator is a technology refresh upgrade to the Navy's AN/UPX-41(C) and AN/UPX-45(C) IFF interrogators.

PATUXENT RIVER NAS, Md. – U.S. Navy air defense experts needed digital identification-friend-or-foe (IFF) interrogators for Navy surface warships and land sites. They found their solution from BAE Systems.

Officials of the Naval Air Systems Command at Patuxent River NAS, Md., announced a $18.9 million contract on 30 May to the BAE Systems Electronic Systems segment in Greenlawn, N.Y., for 18 AN/UPX-50(C) digital identification boxes and 50 retrofit kits to convert AN/UPX-41(C) to AN/UPX-50(C) for the Navy and U.S. Coast Guard.

The AN/UPX-50(C) digital IFF interrogator that is the upgraded U.S. Navy Mode 5 level 1and level 2 and Mode S interrogator. It is a tech refresh upgrade to the Navy's AN/UPX-41(C) and AN/UPX-45(C) IFF interrogators.

The IFF interrogator is part of the Mark XII and Mark XIIA IFF interrogator processing system. It includes Mode 5 and Mode S, and adds a third receive channel for passive acquisition of Mode 5 Level 2 and ADS-B In.

Related: Navy to contract BAE Systems for IFF interrogators to identify friendly and enemy aircraft

The Mark XIIA IFF interrogator is for naval and land-based air defense, and conforms to U.S. military, NATO, ICAO, and U.S. FAA airborne surveillance, and air traffic control standards.

Its modular and digital architecture accommodates customized configurations for air defense, weapon systems, air traffic control, and range instrumentation.

The interrogator can generate digital target reports, wideband video for passive and active decoding, and provides amplitude monopulse for improved azimuth accuracy over conventional systems. It operates autonomously, or with a host radar.

Related: Curtiss-Wright wins $9 million Navy contract to provide single-board computers for surface warships

The AN/UPX-50(C) digital IFF interrogator is based on the VME embedded computing design standard, uses mbedded M5 NSA certified crypto, offers built-in test, offers growth for a target data extractor.

The interrogator can operate at altitudes to 12,000 feet in temperatures from -28 to 65 degrees Celsius. It meets MIL-S-901D for shock and vibration, exposure to salt fog and humidity, and meets MIL-STD-461D electromagnetic compatibility.

For more information contact BAE Systems Electronic Systems online at, or Naval Air Systems Command at

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