Military Wiki
USS Mahan SPG-55B radars.jpg
The USS Mahan (DDG-42) underway in 1983 to test and evaluate the Terrier New Threat Upgrade (NTU) Combat System. Two AN/SPG-55B directors are above the Mark 10 Terrier/Standard missile launcher and the sailors.
Country of origin United States
Type Missile fire-control
Precision Fire control quality three dimensional data

Rear view of the AN/SPG-55B aboard USS Worden (CG-18).

The AN/SPG-55 was a tracking / illumination radar for Terrier and RIM-67 Standard missiles (SM-1ER/SM-2ER). It was used for target tracking and Surface-to-air missile guidance on numerous ships including Kitty Hawk-class aircraft carriers,Belknap-class cruisers, Leahy-class cruisers and Farragut class destroyers. It was also used on the nuclear-powered single units USS Long Beach (CGN-9), USS Bainbridge (CGN-25) and USS Truxtun (CGN-35). The SPG-55 was part of the Mk 76 missile fire control system.[1]


The designation "AN" stands for "Army-Navy" while "SPG" is not an acronym, but part of the MIL-STD-196E Type Designation System:[2]

  • First letter (installation) - S = Water (surface ship)
  • Second letter (type of equipment) - P = Radar
  • Third letter (purpose) - G = Fire Control or Searchlight Directing


An SPG-55 on the starboard side USS America (CV-66). (center of image)

  • AN/SPG 55 - Original version supported Beam riding Terrier missiles.
  • AN/SPG 55A - Supported Beam-riding and homing Terrier missiles
  • AN/SPG 55B - Supported Beam-riding and homing Terrier missiles as well as newer Standard missiles.

See also


  1. "MK 76 Missile Fire Control System". Archived from the original on 2009-10-24. 
  2. Department of Defense (1998). Department of Defense Standard Practice Joint Electronics Type Designation System. MIL-STD-196E. 

External links

This page uses Creative Commons Licensed content from Wikipedia (view authors).