Description of the radar set, tactical-technical characteristics
Figure 1: 91N6
|frequency:||2.9 … 3.3 GHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):|
|instrumented range:||600 km|
|accuracy:||200 m, 0.5°|
|hits per scan:|
|antenna rotation:||5 or 10 min⁻¹|
91N6 (NATO-designator “Big Bird”) is operating in the S-Band surveillance and tracking radar developed for the SA-21 “Growler” surface-to-air missile system (Russian designator: S-400 “Triumf”). Basically, the 91N6E is an upgraded variant of the 64N6E radar (NATO-designator “Tombstone”) with the same antenna design but higher transmitter power. Its digital signal processing can detect up to 300 targets.
The radar is placed in two containers, one fixed with the radar electronic and the indicators, the second with the transmitters, receivers and the antennas. The main antenna is a reflection type of space feeded phased-array antenna using 2 700 phase shifters. Two main antennas are mounted back-to-back with beam scanning in two planes. The radar offers different operating modes for maximum adaptation to combat conditions, e.g. continuous antenna rotation, sector view, stopped antenna drive and additional antenna tilt. The 64N6E incorporates additional auxiliary antenna/receiver channels for suppression of sidelobe jammers. An IFF-System is incorporated.
- 91N6 - intended for maintenance with SA-10A “Grumble” (Russian designator: S-300) and SA-21 “Growler” (Russian designator: S-400 “Triumf”) SAM-systems, developed in 1978;
- 91N6A - modernized for use in S-400M “Triumf” SAM-systems, developed in the mid-80s;
- 91N6М - modernized for future use in S-500 “Prometheus” SAM-systems (maximum range: 640 km);
- 91N6E - variant for export, without the Russian IFF and possibly reduced combat characteristics.