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Description of the radar set, tactical-technical characteristics

Figure 1: Short-range radar AN/FPS-124 at Lailor River, Nunavut (Canada)

Figure 1: Short-range radar AN/FPS-124 at
Lailor River, Nunavut (Canada)
(69°6'39.01" N   83°32'22.50" W)

frequency: 1218 to 1398 MHz
(at six assigned frequencies)
pulse repetition time (PRT):
pulse repetition frequency (PRF):
pulsewidth (τ):
receive time:
dead time:
peak power:
average power:
instrumented range: 70 NM (≙ 113 km)
range resolution:
hits per scan:
antenna rotation:
MTBCF: > 4000 hrs
MTTR: < ½ hr


The AN/FPS-124 is a gap filler radar for the North Warning System. The radar is a high-reliability, unattended and easily maintained short-range radar designed to operate in conjunction with the AN/FPS-117 long-range surveillance radars in the upgraded North Warning System. The radars can detect and track small radar cross-section, low flying targets, and are to be particularly effective in detecting cruise missile penetration of US and Canadian airspace.

FPS-124 uses a cylindrical phased-array antenne operating in L-Band that is approximately 12 ft (3.66 m) tall with a diameter of 5 ft (1.25 m). The electronics for the transmitter/controller are located inside the cylindrical assembly. It is cooled by 11 fans, which are the only moving parts in the system.

A total of 39 units have been produced.