AN/ASG-18

Hughes AN/ASG-18HughesHughes AN/ASG-18 Fire Control System
The Hughes AN/ASG-18 Fire Control System was a prototype airborne fire control radar system for the planned North American XF-108 Rapier interceptor aircraft for the United States Air Force.wikipedia
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Pulse-Doppler radar

Dopplerpulse-Dopplerpulse doppler
It was the US's first Pulse-Doppler radar, giving it look-down/shoot-down capability, and was also the first track while scan radar (could track one target at a time).
The Hughes AN/ASG-18 Fire Control System was a prototype airborne radar/combination system for the planned North American XF-108 Rapier interceptor aircraft for the United States Air Force, and later for the Lockheed YF-12.

North American XF-108 Rapier

XF-108 RapierF-108 RapierXF-108
The Hughes AN/ASG-18 Fire Control System was a prototype airborne fire control radar system for the planned North American XF-108 Rapier interceptor aircraft for the United States Air Force.
The final configuration for the rear cockpit in the YF-12A looked similar to that of the F-108 since it incorporated the same displays and controls required for the Hughes AN/ASG-18 fire control system.

Look-down/shoot-down

look downlook down shoot downlook-down
It was the US's first Pulse-Doppler radar, giving it look-down/shoot-down capability, and was also the first track while scan radar (could track one target at a time).
The Hughes AN/ASG-18 fire control system was a prototype airborne radar/combination system for the planned North American XF-108 Rapier interceptor aircraft for the United States Air Force, and later for the Lockheed YF-12.

AIM-47 Falcon

AIM-47 GAR-9 / AIM-47 FalconFalcon
The system was to be used with the Hughes AIM-47 Falcon missile, which also had a range of about 100 miles.
It was developed in 1958 along with the new Hughes AN/ASG-18 radar fire-control system intended to arm the Mach 3 XF-108 Rapier interceptor aircraft and, after its cancellation, the YF-12A.

Track while scan

track-while-scanability to track two targets while scanningTWS
It was the US's first Pulse-Doppler radar, giving it look-down/shoot-down capability, and was also the first track while scan radar (could track one target at a time).
The original TWS airborne set was the Hughes Aircraft AN/ASG-18 of the XF-108 Rapier, which could track a single target.

Lockheed YF-12

YF-12Lockheed YF-12AYF-12A
Before the test "Snoopy" could fly, the XF-108 program was cancelled, and the proposed Lockheed YF-12 interceptor was to instead receive the radar/missile system pair.
The main changes involved modifying the A-12's nose by cutting back the chines to accommodate the huge Hughes AN/ASG-18 fire-control radar originally developed for the XF-108 with two infrared search and track sensors embedded in the chine leading edge, and the addition of the second cockpit for a crew member to operate the fire control radar for the air-to-air missile system.

Convair B-58 Hustler

B-58 HustlerB-58Convair B-58A Hustler
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 Hustler bomber.
One was specially modified to test the Hughes radar system intended for the Lockheed YF-12 interceptor and the North American F-108 Rapier, which had an extended nose to accommodate the radar and was nicknamed "Snoopy" (see Aircraft on Display).

Fire-control radar

fire control radargunnery radarradar
The Hughes AN/ASG-18 Fire Control System was a prototype airborne fire control radar system for the planned North American XF-108 Rapier interceptor aircraft for the United States Air Force.

United States Air Force

U.S. Air ForceAir ForceUSAF
The Hughes AN/ASG-18 Fire Control System was a prototype airborne fire control radar system for the planned North American XF-108 Rapier interceptor aircraft for the United States Air Force.

Infrared search and track

infra-red search and trackIRSTInfra-red search and track (IRST)
This was paired with an infrared search and track (IRST) system.

L3 Electron Devices

Hughes Electron DynamicsElectron Dynamic DevicesBoeing Electron Dynamic Devices
In the early 1950s, Hughes secured a military contract for the XF-108 Rapier interceptor's AN/ASG-18 fire control system and radar.

Republic XF-103

XF-103F-103Republic F-103
Part of this project was the development of the advanced Hughes AN/ASG-18 pulse-doppler radar and the GAR-9 missile.

AN/AWG-9

AWG-9AN/APG-71APG-71
The Rapier had much better performance than the Missileer, although its AIM-47 Falcon and AN/ASG-18 radar, both from Hughes, were somewhat less advanced than their Navy counterparts.

Douglas F6D Missileer

F6D MissileerAN/DPN-53Fleet Air Defense
Hughes was also supplying the AN/ASG-18 radar system for the F-108, and while it was less advanced than the AN/APQ-81 and lacked track-while-scan, it had even greater range.