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ASR-30

Description of the radar set, tactical-technical characteristics

Figure 1: ASR-30

Figure 1: ASR-30

Specifications
frequency: 1 250 … 1 350 MHz
(L-Band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 524 Hz (average)
pulsewidth (τ): 2 µs
receive time:
dead time:
peak power: 2 MW
average power: 3.65 kW
instrumented range: 120 NM (≙ 220 km)
range resolution:
accuracy:
beamwidth: 1.6°
hits per scan:
antenna rotation: 12 rpm
MTBCF: 5 000 hrs
MTTR:

ASR-30

ASR-30 was operating in L-Band fully coherent air surveillance radar for use in air traffic management.

The reflector antenna with the size 9.4 m high x 10 m wide was fitted with two feed horns. It used the technology of high- and low beam to reduce the influence of ground clutter. The high beam horn was in receive-only-mode. Both horns were in polarity diversity to reduce weather clutter. The transmitter used two klystrons in frequency diversity. All essential assemblies (except the antenna) were duplicated for redundancy.

An integrated secondary radar (IFF) used the parabolic reflector of the primary radar also. Its emitter was mounted next to the feed horns and used the main reflector “squinting”. This simultaneously compensate the longer processing time in the decoder so that the IFF response was available simultaneously with the echo signal.

This radar was developed from the ARSR-3 in the late 1960s and was the most modern and powerful air traffic control radar during this era. However, it was over-sized in terms of maximum range and too expensive. It could not succeed against the cheaper S-band ATC-radars using magnetrons.