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Description of the radar set, tactical-technical characteristics
frequency: 2.7 … 2.9 GHz
(S band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 250 … 1 200 Hz
pulsewidth (τ): 1; 2; 50 or 100 µs
receiving time:
dead time:
peak power: 10 kW
average power: ≤ 1 kW
instrumented range: 450 km (@23 dBZ)
range resolution:
beamwidth: ≤ 1.7°
hits per scan:
antenna rotation: 0 … 6 rpm


The JMA-254 is operating in the S band, only semiconductor-based precipitation radar manufactured by Japan Radio Corporation. Due to its long-range and lower attenuation in the S band, the radar can detect dangerous weather events far out in the ocean before they hit the mainland.

It uses a symmetrical parabolic antenna with a diameter of about 5 m and linear-horizontal polarization. The multi-channel digital receiver has a sensitivity of −110 dBm.

The radar was developed in 2011. It was the World’s first S-band solid-state weather radar.