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Volna 3R41 (Top Dome) Fire Control Radar (FCR)

The Volna 3R41 (Top Dome) Fire Control Radar (FCR) for the S-300F Surface to Air Missiles (SAM) was mounted on the Kirov Petr Velikiy and Slava class units of the Russian Navy. The radar has a modified ground-based version called "Flap Lid" 36N85; some sources mistakenly report it as Top Dome. The 9,400-ton Soviet navy Slava cruiser built in 1983 had the SAN-6b Rif-M VLS with a huge 35-ton 3R41 Volna engagement radar named Top Dome.

The 3R41 Volna is used in Slava and Kirov for guidance of S-300F. The land based 5N63S for S-300P family use backplane feed where the transmit and receive feed is located behind the phased array antenna. But 3R41 used a different arrangement referred as reflective phased array where the feed is located ahead of the array. The phasing principle of the 3R41 Volna is different from a conventional phased array radar.

Instead of individual transceiver elements, 3R41 Volna has a central feed (the nib on the center of the radome) which reflects phase-changed transmissions off a flat surface. 3R41 operates in the J-band, and applies it's phase changes to a flat array that acts as a reflector for the feed mounted on the radome. The small hemispheric radome is associated with the missile control system. The three long dielectric features on the sensor’s front are a part of some sort of diagnostic subsystem, or an ECCM device.

"Top Dome" can simultaneously control two-three missiles for a total of six SAMs in flight). The radar detects both missiles in flight and time-sharing targets through the processor. The system is seems to have a range of 55nm, but against a fighter the 40Nm are more realistic.

The S-300F / Rif system, built into the Chinese Type 051C class destroyer, consists of 6 vertical launchers, each with 8 rockets. Two launchers were installed below the bow deck, behind the bow cannon, while the remaining 4 launchers were installed in the stern hull structure, in front of the heliport. The 5V55RM single-stage rocket has a maximum range of 90 km and operates at targets at altitudes up to 30 km. The 5V55RM missile uses semi-active, radar guidance and is guided by a 3R41 Volna phase-shift target radar (NATO's Top Dome code). This radar allows guiding 12 missiles at 6 targets simultaneously.

It is a phased antenna array under a dome with a diameter of about 4 m with a fixed elevation angle and induced in azimuth. In front of the pedestal there are also three semi-cylindrical radiotransparent caps (presumably an escort transceiver through a rocket) and a small hemispherical cap.

Each radar serves 6 (on project 1144 cruisers) or 8 (on project 1164 cruisers) vertical missile launcher drums and is capable of simultaneously directing missiles at 3 targets in time sharing mode, unlike earlier Soviet naval air defense systems, where each target was accompanied by a separate radar . Scanning by elevation is provided electronically [1] . For each target, simultaneous guidance of two missiles is possible.

RadarTop Dome [3R41 Volna]
Type Radar
Generation Early 1980s
Altitude Max 30 km
Range Max 170 km
Altitude Min 0 m
Range Max 170 km
Range Min 0.2 km
Properties Pulse Doppler Radar (Full LDSD Capability),
Interrupted Continuous Wave Illumination

3R41 Volna Top Dome radar 3R41 Volna Top Dome radar 3R41 Volna Top Dome radar 3R41 Volna Top Dome radar

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Page last modified: 17-10-2019 19:08:56 ZULU