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Description of the radar set, tactical-technical characteristics

Figure 1: SA 319B Alouette III with ORB-31 radar

Figure 1: The Iraqi helicopter “Super Frelon” with the registration F-WXFH had an ORB-31 radar.

frequency: X-band
pulse repetition time (PRT):
pulse repetition frequency (PRF):
pulsewidth (τ):
receiving time:
dead time:
peak power:
average power:
instrumented range:
range resolution:
hits per scan:
antenna rotation:


ORB-31 is operating in the X-band modular radar that can be configured to fit a number of helicopters for surface search, target designation, missile fire control, weather monitoring, navigation, anti-surface warfare and anti-submarine warfare missions. The radar used a parabolic antenna in sector mode, providing a fan beam pattern.

The SA 319B Alouette III could be fitted with ORB-31 radar for maritime warfare, accommodated in a bulbous nose fairing attached to the front cockpit glazing.

Development began in the 1970s. The flight test took place in December 1974.