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AWS-1

Description of the radar set, tactical-technical characteristics

Figure 1: AWS-1

Specifications
frequency: 2 700 … 3 100 MHz
(S-Band)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 700 Hz
pulsewidth (τ): 1 µs
receive time:
dead time:
peak power: 650 kW
average power:
instrumented range: 75 NM (≙ 139 km)
range resolution:
accuracy:
beamwidth:
hits per scan:
antenna rotation: 15 min-1
MTBCF:
MTTR:

AWS-1

The AWS-1 was an operating on a single frequency in S-Band naval radar for surface warning and air and surface target indication. It was developed in 1956/57 amd was primarily designed for installation of destroyers, frigates and corvettes.

The AWS-1 antenna was a double curved parabolic reflector with a width of 16 feet and cosecant squared antenna pattern. The feed of the antenna was only linearly polarized. The transmitter used a magnetron operating on a fixed frequency. The receiver was fitted with a klystron as local oscillator and was fitted with an automatic frequency control.

The antenna reflector was very successful and became a prime example for several other radars, from AR-1, AR-15 to Watchman.

AWS-2

AWS-2 is the sucessor of AWS-1 using the same antenna but with switcheable linear or circular polarization and a hydraulic stabilized against pitch and roll turntable. The transmitter used tuneable magnetrons in two frequency sub-bands (2.7 … 2.9 GHz and 2.9 … 3.1 GHz). The receiver used a parametric amplifier with a bandwidth of 15 MHz and digital moving target indication with double cancellation.