AN/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
Type	Pulse-Doppler radar, Missile fire-control
Precision	Fire control quality three-dimensional data

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 on Template:Sclass-s, Template:Sclass-s, and Template:Sclass-s.

The Italian Navy used it aboard their Audace class, Durand de la Penne class and Template:Sclass-s. The French Cassard class, Royal Netherlands Navy Tromp class and Spanish Baleares class frigates also use this system.

Older variants were used on Template:Sclass-s, as well as the related German Lütjens class and Perth class used by the Royal Australian Navy.

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.

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  AN/SPG-51 radars of a Cassard class frigate

External links

• MK-74 Guided Missile Fire Control System (GMFCS)
• AN/SPG-51D Missile Director Radar