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AN/APS-31

Description of the radar set, tactical-technical characteristics

Figure 1: Douglas AD-4 Skyraider mit dem AN/APS-31 im POD unter dem rechten Flügel

Figure 1: Douglas AD-4 Skyraider mit dem AN/APS-31 im POD unter dem rechten Flügel

Specifications
frequency: 9 375 GHz
(X-band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 800, 400, and 200 Hz
pulsewidth (τ): 0,5, 2,25, and 4.5 µs
receiving time:
dead time:
peak power: 52 kW
average power:
instrumented range: 200 NM (≙ 370 km)
range resolution:
accuracy:
beamwidth:
hits per scan:
antenna rotation:
MTBCF:
MTTR:

AN/APS-31

AN/APS-31 is operating in X-band surveillance and navigation radar.

AN/APS-31 is a further development of the AN/APS-15. It used two sector PPI scopes with a diameter of 5 inches (≙ 12.7 cm) and showed a forward sector of 160°. The Antenna uses a symmetrical parabolic reflector with a horn radiator.

The AN/APS-31B version used a larger antenna with only a 1.5° beam width but could steer only in a sector of either 60° or 120°.

AN/APS-31 radar was mounted in several US-Navy aircraft from 1950 to the 60s, including the Douglas AD Skyraider, Lockheed P-2 Neptune, and the Grumman S-2 Tracker. It often replaced the AN/APS-20.