www.radartutorial.eu www.radartutorial.eu Card Index of Radar Sets - Air Defense Radar

AR-3D (Type 94 radar)

Description of the radar set, tactical-technical characteristics

Figure 1: AR-3D
(© The Decca Legacy)

Figure 1: AR-3D
The Decca Legacy)

frequency: 2 915 … 3 055 MHz
(S band)
pulse repetition time (PRT): 4 000 µs
pulse repetition frequency (PRF): 250 Hz
pulsewidth (τ): 36 µs
receiving time:
dead time:
peak power: 1.1 MW
average power: 10 kW
instrumented range: 260 NM (≙ 480 km)
range resolution:
beamwidth: β= 1°; ε= 2°
hits per scan:
antenna rotation: 6 min⁻¹

AR-3D (Type 94 radar)

AR-3D is operating in the S band 3D- early warning and fighter control radar. In the Royal Air Force the radar was designated as Type 94 radar.

The antenna was fitted with a 12 × 12 meter single curved parabolic reflector. It used the principle of frequency scanning phased array, producing a Pencil-Beam that scanned in elevation from 0 to 30 degrees. The transmitter used a Traveling Wave Tube followed by a klystron power amplifier. The transmit pulse was a linear frequency modulated pulse of 36 µs length with a saw-tooth-like frequency shift of 140 MHz. In the receiver, this frequency range was divided into eight frequency channels, each of which was responsible for a range of elevation angles.