Description of the radar set, tactical-technical characteristics
Figure 1: AWACS Blimp ZPG-3W
|frequency:||420 … 430 MHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||300 Hz|
|pulsewidth (τ):||6 µs|
|peak power:||2 MW|
|instrumented range:||220 NM (≙ 410 km)|
|hits per scan:|
|antenna rotation:||6 rpm|
AN/APS-70 was an operating in the UHF-Band airborne early warning radar. It was capable of detecting distant flying objects through multiple layers of cloud clutter.
The AN/APS-70 was fielded in three experimental development versions. Two radars were built by Lincoln Laboratory, two by Hazeltine Electronics, and two by General Electric (GE). The broadband 425-megahertz antennas (including Identification Friend-or-Foe, IFF) were supplied by Hughes. All three firms carried out production under contract to Lincoln Laboratory, and the technology was thus transferred to industry.
The AN/APS-70 was used in P2V-6, EC-121, EZ-1C, and in the blimp ZPG-3W. In the EC-121, the antenna is located in the large black radome under the fuselage. On the ZPG-3W, the the radar was installed inside the helium envelope, supported from the bottom of this radar platform. Above the envelope was a small radome with an additional height finder AN/APS-62. The AN/APS-70 search radar had a rotating antenna measuring 40 feet wide by 6 feet high ( 12.2 x 1.8 m). An IFF (interrogation friend or foe) antenna was attached at the bottom of the AN/APS-70 antenna.