Spg-51

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 origin	United States
Manufacturer	Raytheon
Type	Pulse-Doppler radar, Missile fire-control
Frequency	Illuminator: 10.25-10.5 GHz; Tracking Radar: 5.45 GHz - 5.825 GHz;
PRF	4100 pps (surface); 9600-16700 pps (air);
Beamwidth	Illuminator: 0.9° (horizontal), 0.9° (vertical); Tracking Radar: 1.6° (horizontal), 1.6° (vertical);
Pulsewidth	Tracking Radar: 2.1-3.2 μs
Range	Tracking Radar: 100 nmi (190 km)
Azimuth	360° at 12°/s
Elevation	-30° to 83°
Precision	Fire control quality three-dimensional data
Power	Illuminator: 4000 W; Tracking Radar: 1600 W average; 81 kW peak; ;

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]

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

T 47-class destroyer (Du Chayla subclass post AAW modernization)^[5]^[6]
Cassard-class frigate^[7]

German Navy

Lutjens-class destroyer^[6]

Italian Navy

Japan Maritime Self-Defense Force

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

References

^ ^a ^b ^c Friedman, Norman (1981). Naval radar. Annapolis, Md.: Naval Institute Press. pp. 179–180. ISBN 0-87021-967-7. OCLC 8262709.
^ ^a ^b ^c ^d ^e ^f ^g ^h Hemenway, D.F.; Navid, B.N. (September 1978). Reliability of Naval Radar Systems (Report). Washington D.C.: Naval Research Laboratory. pp. 83–88.
^ ^a ^b Winter, Charles F. (Winter 1974). "Mechanically-Scanning Antennas". Electronic Progress. 16 (4): 4. Bibcode: 1974ElPr...16....2W.
^ 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)
^ ^a ^b ^c ^d ^e 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.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ 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)
^ ^a ^b ^c ^d 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)
^ 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)
^ NAVEDTRA 10199-C: Gunner's Mate M 3 & 2. Naval Education and Training Support Command. 1977. p. 147.
^ 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)
^ "Evaluating the DDG". Proceedings of the U.S. Naval Institute. 91 (7): 749. July 1, 1965. Retrieved February 18, 2023.
^ 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

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

External links

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[naval-radar-1] Friedman, Norman (1981). Naval radar. Annapolis, Md.: Naval Institute Press. pp. 179–180. ISBN 0-87021-967-7. OCLC 8262709.

[adc016190-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h Hemenway, D.F.; Navid, B.N. (September 1978). Reliability of Naval Radar Systems (Report). Washington D.C.: Naval Research Laboratory. pp. 83–88.

[mechanically-scanning-antennas-4] Winter, Charles F. (Winter 1974). "Mechanically-Scanning Antennas". Electronic Progress. 16 (4): 4. Bibcode: 1974ElPr...16....2W.

[janes-weapon-systems-1972-1973-6] 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)

[:0-7] 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.

[:1-8] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ 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)

[combat-fleets-of-the-world-9] 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)

[10] 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)

[GMM-3-2-11] NAVEDTRA 10199-C: Gunner's Mate M 3 & 2. Naval Education and Training Support Command. 1977. p. 147.

[12] 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)

[13] "Evaluating the DDG". Proceedings of the U.S. Naval Institute. 91 (7): 749. July 1, 1965. Retrieved February 18, 2023.

[14] 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.

[3] All data in infobox is for SPG-51D unless otherwise stated

[unknown-version-5] It is uncertain as to which version of the SPG-51 this performance figure comes from.

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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 origin	United States
Manufacturer	Raytheon^[1]
Type	Pulse-Doppler radar, Missile fire-control
Frequency	Illuminator: 10.25-10.5 GHz^[2] Tracking Radar: 5.45 GHz - 5.825 GHz^[2]^[a]
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)
Pulsewidth	Tracking Radar: 2.1-3.2 μs
Range	Tracking Radar: 100 nmi (190 km)^[2]
Azimuth	360° at 12°/s^[3]^[b]
Elevation	-30° to 83°^[3]^[b]
Precision	Fire control quality three-dimensional data
Power	Illuminator: 4000 W^[2] Tracking Radar: 1600 W average^[2] 81 kW peak^[2]