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
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.

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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