AN/SPG-51

The AN/SPG-51 is an American tracking / illumination fire-control radar for RIM-24 Tartar and RIM-66 Standard missiles. It is used for target tracking and Surface-to-air missile guidance as part of the Mk. 73 gun and missile director system, which is part of the Tartar Guided Missile Fire Control System.[4]

AN/SPG-51
The superstructure of the USS Richard E. Byrd (DDG-23) showing the ship's radars, 1983. There are two AN/SPG-51 directors shown directly in the center of the image.
Country of originUnited States
ManufacturerRaytheon[1]
TypePulse-Doppler radar, Missile fire-control
Frequency
PRF
  • 4100 pps (surface)
  • 9600-16700 pps (air)[2]
Beamwidth
  • Illuminator: 0.9° (horizontal), 0.9° (vertical)
  • Tracking Radar: 1.6° (horizontal), 1.6° (vertical)
PulsewidthTracking Radar: 2.1-3.2 μs
RangeTracking Radar: 100 nmi (190 km)[2]
Azimuth360° at 12°/s[3][lower-alpha 2]
Elevation-30° to 83°[3][lower-alpha 2]
PrecisionFire control quality three-dimensional data
Power
  • Illuminator: 4000 W[2]
  • Tracking Radar:
    • 1600 W average[2]
    • 81 kW peak[2]

Aircraft tracking is based on monopulse radar utilizing Pulse-Doppler radar signal processing in MK 74 MOD 14 and MK 74 MOD 15. The MK 74 MOD 15 configuration includes continuous-wave radar tracking in addition to pulse-Doppler tracking. It provides illumination for bistatic radar operation associated with missile guidance in all configurations. Older systems rely on conical scanning rather than monopulse.

Platforms

 French Navy

 German Navy

 Italian Navy

 Japan Maritime Self-Defense Force

 Royal Australian Navy

 Royal Netherlands Navy

 Spanish Navy

 United States Navy

Variants
  • SPG-51: Original Model.
  • SPG-51B: Upgraded SPG-51 designed for use with Improved Tartar (IT) missile.[11]
  • SPG-51C: Automatic acquisition and tracking, increased reliability, and improved ECCM capabilities, clutter rejection, and multiple target resolution.[1]
  • SPG-51D: Klystron replaced with traveling-wave tube to permit the transmission to be chosen from a much wider bandwidth. Increased use of integrated circuitry and digital circuitry.[2]
  • SPG-51E: Proposed "universal fire control radar" capable of controlling the RIM-8 Talos as well as Tartar.[1] Not built in quantity.[12]
  • AN/SPG-51 radars of a Cassard class frigate
    AN/SPG-51 radars of a Cassard class frigate

References
  1. Friedman, Norman (1981). Naval radar. Annapolis, Md.: Naval Institute Press. pp. 179–180. ISBN 0-87021-967-7. OCLC 8262709.
  2. Hemenway, D.F.; Navid, B.N. (September 1978). Reliability of Naval Radar Systems (Report). Washington D.C.: Naval Research Laboratory. pp. 83–88.
  3. Winter, Charles F. (Winter 1974). "Mechanically-Scanning Antennas". Electronic Progress. 16 (4): 4. Bibcode:1974ElPr...16....2W.
  4. Jane's weapon systems. 1972-73: 4th ed. Ronald Thomas Pretty, Dennis Henry Ross Archer. London: Jane's Yearbooks. 1972. p. 540. ISBN 0-354-00105-1. OCLC 655668873.{{cite book}}: CS1 maint: others (link)
  5. Jordan, John (1986). An illustrated guide to modern destroyers. New York, N.Y.: Prentice Hall. pp. 58, 70, 77, 79, 134. ISBN 0-13-450776-2. OCLC 13010345.
  6. The World's navies. Christopher Chant. Newton Abbot [England]: David and Charles. 1979. pp. 63, 92–93, 104, 122, 229, 231, 241. ISBN 0-7153-7689-6. OCLC 5798981.{{cite book}}: CS1 maint: others (link)
  7. Combat fleets of the world : their ships, aircraft, and armament, 1986/87. Jean Labayle Couhat, United States Naval Institute (6th ed.). Annapolis, Md.: Naval Institute Press. 1986. pp. 13, 123, 420, 643. ISBN 0-85368-860-5. OCLC 14161346.{{cite book}}: CS1 maint: others (link)
  8. Jane's fighting ships, 2009-2010 2009/2010. Stephen Saunders (112th ed.). Coulsdon: Jane's Information Group. 2009. p. 395. ISBN 978-0-7106-2888-6. OCLC 652063550.{{cite book}}: CS1 maint: others (link)
  9. NAVEDTRA 10199-C: Gunner's Mate M 3 & 2. Naval Education and Training Support Command. 1977. p. 147.
  10. Jane's strategic weapons systems. Duncan Lennox, Roger Loasby, Jane's Information Group (1st ed.). Coulsdon, Surry, Eng.: Jane's Information Group. 1989. p. 405. ISBN 0-7106-0880-2. OCLC 20284225.{{cite book}}: CS1 maint: others (link)
  11. "Evaluating the DDG". Proceedings of the U.S. Naval Institute. 91 (7): 749. July 1, 1965. Retrieved February 18, 2023.
  12. Friedman, Norman (1989). The Naval Institute guide to world naval weapons systems. United States Naval Institute. Annapolis, Md.: Naval Institute Press. p. 201. ISBN 0-87021-793-3. OCLC 20098065.

Notes
  1. All data in infobox is for SPG-51D unless otherwise stated
  2. It is uncertain as to which version of the SPG-51 this performance figure comes from.


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