Description of the radar set, tactical-technical characteristics
Figure 1: AN/SPS-39 radar aboard the U.S. Navy USS Atlanta, 1964.
|frequency:||2 910 … 3 100 MHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||1 850 Hz or 925 Hz|
|pulsewidth (τ):||2 or 4 µs|
|peak power:||1 MW|
|instrumented range:||100 or 160 NM|
(≙ 185 or 296 km)
|beamwidth:||1.1° × 2.25°|
|hits per scan:|
|antenna rotation:||6 or 15 rpm|
The AN/SPS-39 was an E/F-band shipborne 3D air search radar used a parabolic-cylinder reflector antenna fed by a line source to produce the change in phase with frequency necessary to scan its beam electronically in elevation.
The first prototype was presented in January 1960. Upgraded with a planar array and an electronic pitch-roll stabilization instead of the mechanical stabilization of the turntable, this radar evolved into the AN/SPS-52.