Mk 92 Guided Missile Fire Control System

The Mk 92 is part of the combat systems of the Oliver Hazard Perry class frigate.

The Mk 92 Fire Control System is a US-built medium-range anti-aircraft missile and gun fire control system. It was developed for the Oliver Hazard Perry class guided missile frigates. The system is a licensed USN version of the Thales Nederland WM-25 fire control system. The Mark 92 fire control system was approved for service use in 1975. Introduction to the fleet and follow-on test and evaluation began in 1978. In 1981, [1]


Radar Systems

The Mk 92 system assigns targets via the ship's air search radar, and surface search radar or from the MK 92's own search radar capabilities. [2]The system has two or three radar sub-systems depending on the model. The first two are combined in to a single system called the Combined Antenna System or CAS is used in all models. The CAS has a track while scan radar (Search) and a tracking radar both housed in an egg shaped randome. The radars can search for, track, and illuminate targets. There is also a third radar for target illumination referred to as the Separate Target Illumination Radar or STIR. The STIR is a radar developed from the AN/SPG-60 radar that is part of the Mk 86 gun fire control system.


  • Mk 92 modification 0 is an early version of the system for the USN.
    Gun and missile control:
    1 air engagement channel
    2 surface-search, TWS channels
  • Mk 92 modification 1 is the version used by United States Coast Guard cutters. It does not use the STIR or control surface to air missiles.
    Gun only:
    1 air engagement channel
    2 surface-search, TWS channels 
  • Mk 92 modification 2 is the version that was originally fit to USN Oliver Hazard Perry class guided missile frigates.
    Gun and missile control:
    2 air engagement channels, including STIR with Mk 107 console
    2 surface-search, TWS channels
  • Mk 92 modification 5 is used by certain Saudi Arabian Badr class corvettes.
    Gun only:
    1 air engagement channel
    2 surface-search, TWS channels 
  • Mk 92 modification 6 is an upgraded version of the modification 2 as part of the CORT program. It was installed on 12 USN FFG-7-class frigates, the eight Republic of China Navy's Cheng Kung-class frigates and two of the Spanish Santa Maria-class units.
    2 air engagement channels, including STIR with Mk 107 console and (coherent receiver/transmitter CORT) transceiver
    2 surface-search, TWS channels

Modification Sufrace Engagement Channels Air Engagement Channels (gun only) Air Engagement Channels
0 2 0 1
1 2 1 0
2 2 0 2
5 2 1 0
6 2 0 2


STIR (Separate Target Illumination Radar) Deactivated

The USN retired the RIM-66E, or Standard missile-1, from active service in 2003. Oliver Hazard Perry frigates in USN service have had the STIR radar removed. The STIR radars are still in use on non-USN vessels.


See also

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