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AR-1

Description of the radar set, tactical-technical characteristics Описание; Основные тактико-технические характеристики (Базы данных)

Figure 1: AR-1

Figure 1: AR-1

Specifications
frequency: 2 750 … 3 050 MHz
(S-Band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 700 Hz
pulsewidth (τ): 1 µs
receive time:
dead time:
peak power: 2 × 650 kW
average power: 2 × 455 W
instrumented range: 70 NM (≙ 130 km)
range resolution:
accuracy:
beamwidth:
hits per scan:
antenna rotation: 15 rpm
MTBCF:
MTTR:

AR-1

The DECCA (later: Plessey) AR-1 is an 2-D terminal approach radar operating in the S-Band. The AR-1 was designed to meet both military and civil airfield approach control requirements.

AR-1 is a frequency diversity radar using two magnetron fitted transmitters and two receivers using a klystron as stable local oscillator, an a low-noise traveling wave tube (TWT) as RF-pre-amplifier. The AR-1 used an analogue system for Moving Target Indication (MTI). It used many different display configurations, utilising the new Fixed Coil PPI-Display.

The antenna of the AR-1 was linearly horizontal polarised only. The innovative shape of the double curved reflector with cosecant squared pattern was exemplary for many later radars, right up to the Watchman.

The AR-1 was installed on a number of international airports, e.g. in 1966 in Sofia, Bulgaria.