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The Hughes AN/ASG-18 was a prototype fire control system and radar, originally intended for the XF-108 Rapier interceptor aircraft, for the United States Air Force.

The AN/ASG-18 was the U.S.marker's first pulse doppler radar, and had look-down/shoot-down capability, though it could only track one target at a time. This was paired with an infrared search and track system. Range of the radar was estimated at between 200 and 300 miles (322 to 482 km), with reliable detection of bomber-sized targets at 100 miles. The installation itself was massive, weighing 2,100 lb (953 kg), and taking up most of the nose of the aircraft. The system was to be used with the Hughes AIM-47 Falcon missile, which also had a range of about 100 miles.

While development work was done with the XF-108, the AN/ASG-18 and Falcon missiles were first tested on a highly modified Convair B-58 bomber. To fit the radar, the nose was lengthened nearly 7 feet (2.13 m), and the infrared sensors were mounted on either side of the forward fuselage. A single missile was housed in a specially built pod underneath the fuselage.

Known as "Snoopy" due to the shape of the nose, before the AN/ASG-18 equipped B-58 could fly, the XF-108 program was cancelled, and the proposed Lockheed YF-12 interceptor was to instead receive the radar/missile system pair. Tests of the system were conducted first in 1960 and until 1963 only on the modified B-58, after which the YF-12 took over until the cancellation of the whole program in 1966 .

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