Description of the radar set, tactical-technical characteristics
Figure 1: AWS-1
|frequency:||2 700 … 3 100 MHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||700 Hz|
|pulsewidth (τ):||1 µs|
|peak power:||650 kW|
|instrumented range:||75 NM (≙ 139 km)|
|hits per scan:|
|antenna rotation:||15 min⁻¹|
AWS-1 (abbr. of Air Warning Ship-borne) was 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 and 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 is the sucessor of AWS-1 using the same antenna but with switchable 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.