Tactical Systems

Identification Friend or Foe

Identification Friend or Foe...
About IFF
Innovative identification solutions from more than 75 years of IFF experience.

About IFF

With our breadth of expertise in avionics and sensor systems, BAE Systems offers significant capability in the area of IFF systems. Spanning more than 75 years of IFF experience, we have delivered over 14,000 transponders, 1,500 interrogators, and 6,000 combined interrogator/transponder systems. Our advanced IFF products enable warfighters to identify friendly forces and make informed decisions in time-critical situations.

IFF technology can be used on existing, new, and emerging platforms including unmanned aerial vehicles, ships, fixed-wing aircraft, and helicopters.


IFF product family




IFF Transponders

IFF Transponder

Our transponders allow aircraft and ships to be identified as friendly forces by responding to interrogations from ground-based or airborne IFF systems. The transponders installed on aircraft and naval vessels establish the identity of friendly forces. Products: AN/APX-117, AN/APX-118, AN/APX-123, AN/APX-124, AN/DPX-7 Reduced Size Transponder.

go to Reduced Size Transponder
  • Flexible interface designed to accommodate retrofit and new installations
  • Modes 1, 2, 3/A, C, 4, 5, S, and ADS-B
  • DoD AIMS certified

IFF Interrogators

IFF Interrogators

The IFF interrogators offer modular architecture for customized configurations and optimized performance for surveillance, air traffic control, and range instrumentation. The AN/APX-41 (C) is the standard U.S. Navy integrator with more than 1,000 units delivered.

  • Operates autonomously or in conjunction with a host radar
  • Modes 1, 2, 3/A, C, 4, 5, and S
  • DoD AIMS certified

Combined Interrogator Transponders (CITs)

Combined interrogator transponders (CIT)

Combined Interrogator Transponders are compact, versatile IFF systems for highly mobile platforms. They provide the warfighter with added ability to identify friendly aircraft in a secure environment.

Products: AN/APX-113 (V), AN/APX-125, and AN/APX-126

  • Modes 1, 2, 3/A, C, 4, 5, S (XP only), and ADS-B
  • DoD AIMS certified
  • Multiple antenna configurations

Cryptographic Computer and Emulator Products

Cryptographic Computer Products

The universal cryptographic computer is used in conjunction with interrogator and/or transponder subsystems to encrypt interrogator challenges, generate transponder encoded replies, and process the coded replies back to the interrogator.

Products: KIV-6 Mark XII IFF Crypto, KIV-77 and KIV-78 Emulators

  • Highly reliable, compact design
  • Loaded with an operational key code each day
  • DoD AIMS certified

IFF Ship Antennas

OE-120/UPX Antenna Group product image

The antenna group supports a wide range of systems, including identification friend or foe (IFF), secondary surveillance radar, and air traffic control radar. The field-proven system is highly reliable, offering constant fleet protection for navies around the world.

Products: OE-120/UPX Antenna Group

  • Instantaneous, multiple target identification
  • Accommodates all standard IFF modes
  • Electronically steered system architecture


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IFF product literature



Transponder products

Interrogator products


Combined Interrogator / Transponder products


Cryptographic Computer and Emulator Products


Tactical Systems

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