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Description of the radar set, tactical-technical characteristics
Alenia RAT-31SL
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Figure 1: Alenia RAT-31SL 3D- Early Warning Radar

frequency: S band
pulse repetition time (PRT):
pulse repetition frequency (PRF): (staggered)
pulsewidth (τ):
receiving time:
dead time:
peak power: 155 kW
average power:
instrumented range: 250 NM
range resolution:
beamwidth: 1,5° (1,3°)
hits per scan: 1 to 3;
antenna rotation: 10 s


RAT-31SL (original designation at Alenia: MRCS-403) is an operating in S-band (IEEE designation) or in E/F-band (NATO designation), 3D air defense radar for target acquisition and fighter guidance, capable of acquiring and escorting targets up to a range of 450 km.

The RAT-31SL is an adaptable radar system for both air defense and air traffic control purposes even under severe ECM conditions. The RAT-31SL is a 3D early warning radar and simultaneously employs multiple independently controlled pencil beams, which provides the flexibility in airspace surveillance and data processing necessary under heavy fixed-target influences.

The radar uses the monopulse method and can reduce its pulse power for good resistance to Anti Radiation Missiles (ARM).

The radar has many EPM capabilities such as the use of an antenna with very small side lobes, fast frequency agility and a separate ECM receive channel to control the EPM measures. The mechanical design allows short set-up and dismantling times to ensure high survivability in the battlefield through rapid deployment readiness.

Picture gallery of Alenia RAT-31SL

Picture 2: Alenia RAT-31SL, the transmitter cabinet with the traveling wave tube traveling wave tube cabinet