The AN/SPG-55 was an American 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 as part of the Mk 76 missile fire control system.[1] It was controlled by a UNIVAC 1218 computer.

SPG-55 radars aboard USS Mahan (DDG-42) on 21 August 1983 (6429184).jpg
USS Mahan (DDG-42) with Mark 10 Terrier/Standard missile launcher
Country of originUnited States
TypeMissile fire-control
PrecisionFire control quality three-dimensional data
Rear view of the AN/SPG-55B aboard USS Worden (CG-18).


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

Onboard shipsEdit

  United States NavyEdit

  Italian NavyEdit


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 alsoEdit

External linksEdit


  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.