2K11M1 "Circle-M1" – SAM medium range

appeared in 1958 , the S-75 could not provide reliable protection against air strikes combined arms (armored) associations in military operations, because it had a low mobility and a great time of deployment. Therefore there was a need for a troop SAM crawler, having as good maneuverability maneuverable able to cover their combined arms (armored) compounds and parts. Development SAM 2K11 "Krug" was launched in 1958 year. Since the "Circle" was supposed to be medium-range complex (which required bulky missiles, transmit antenna and radar devices SAMs), it has not been possible to place all the elements on a single crawler.

SAM 2K11 “A circle” – video

Therefore, in parallel with the creation of surface-to-air missile developed launcher and radar systems for various purposes. Joint tests of the complex began in 1963 year, and 1965 2Q11, the SAM "Circle" was adopted in the future repeatedly modernized. V1967 goduuZRK "circle-A" lower boundary of the affected area has been reduced from 3 km to 250 m, and the proximal border decreased from 11 to 9 km. After improvements in SAM 1971 year of the new SAM "Circle M" far edge of the affected area increased from 45 to 50 km, and the upper limit increased from 23,5 to 24,5 km. SAM "Circle-M1" was adopted in 1974 year. Martial means "Circle" SAM up: a) self-propelled launcher (SPU) 2P24 with two missiles ZM8; b) missile guidance station (NRC) 1C32; at) station obnaruzheniya and reconnaissance (SOC) 1C12. SPU 2P24 is a tracked chassis GM-123 with installed gun carriage (rotating electric cylinders and raises bar for two missiles), computing devices (SRP), equipment training missiles for launch, navigation system and the telecode connection with CHP. CHP 1S32 -Radar centimeter range, Made GM-124 chassis and providing missile guidance command telecontrol method of the first kind. Antenna CHP system ("Antenna column") It is a complex structure, consisting of reflector antennas sighting radar targets (Radar-1), antennas narrow and wide beam radar rocket sighting (Radar-2), the command station antenna (IBS), high-frequency devices transmitting and receiving systems and the television camera optical sight (TOV).

Self-propelled launcher 2P24 SAM “Circle-M”

The machine itself placed calculation, indicating and control apparatus, computing devices, navigation system, device low frequency receiving systems, Interference protection system, automatic rangefinders targets and missiles, navigation system and the system telecode connection with the SPU and the command post of the division. Protection from CHP RLP lesion is achieved by using a discontinuous radiation modes and guided radar software-1 at the transmitter is turned off, as well as semi-automatic target tracking on the image on the screen TOV. SOC 1S12 – Circular scan radar with a range of up to 180 km, Made chassis GM-426. GM-123 and GM-124 -legkobronirovannye machines, created on the basis of the chassis experimental artillery SU-100P, and GM-426 was developed based on the caterpillar tractor AT-T. Independent power supply ground elements provided by SAM installed on their gas-turbine power units. SAM has a weight of about ZM8 2,5 m and airspeed to 10OO m / s. It is equipped with a marching supersonic ramjet engine, fill 270 kg kerosene, and four discharged after start starting solid boosters first stage. The missile has a proximity fuse, control radio control receiver and an onboard transponder. The hardware includes vehicles made on the basis of transport and loading vehicle (Edit) 2T6, transport vehicle (TM) 2T5, indicator measuring screening station 2V9 and reconstruction means.

missile guidance station 1S32 SAM “Circle-M”

Automatic control fighting SAM "Circle" provides a set of K-1 ACS "Crab". AT 1981 g. It was adopted by the new ACS 9S468M1 "Polana-D1" (PBU B-9S478 and 9S479 PBU-D). Anti-aircraft missile brigade, armed SAM "Circle", staffing compound was VOP-arms (tank) army or front or was part of an antiaircraft rocket artillery division. The brigade had in its composition control battery (PBU-B, consisting of a cockpit combat control (BMF) 9S486 and pairing cab 9S487 and radar P-40, P-18, P-19, FIRST-16), three anti-aircraft missile division, technical unit and battery maintenance. SAM works as follows. SOU 1S12 explores and transmits information to the AR-D, which provides processing 8 goals. PBU-D also receives information targeting (by 4 goals) of PBU-B and 4 goals transmits target information on CHP. Antenna SNR automatically turns in the direction of said target, and radar-1 performs a quick search in a narrow sector, It produces grip and precise tracking of the target. RPC turn defines the angles of radar antennas 2, avtodalnomer rocket tuned to the missile seizure (1300 m). According to data from the NDC to the desired point vstrelivaniya unfold carriages launchers. After starting the rocket it is captured and is accompanied by the radar-2. Filed radar 1 and radar-2 produced in the PSA Flight Control Team, are encoded in the encoder and transmitted to the missile board using SEC. When approaching the target is transmitted to the SAM command to start work radar fuze. When removing missiles from the target of not more than 50 m occurs undermining HE fragmentation warhead directional.
The disadvantages are the need of the SAM assembly and fueling their missiles before loading the SPU to, weak capacity for exploration CHP, do not allow the battery to fully conduct independent combat operations, Powerful radiation CHP and SDA transmitters, which increases the probability of hitting their PRR, as well as the complexity of the operation of CHP 1S32. However, SAM "Circle" was quite modern and suitable for their time and ensure effective execution of combat missions.

detection station 1S12 SAM goals “Circle-M”

Performance characteristics 2K11M1 SAM "Circle-M1"

charging SAM

Start SAM SAM "Circle-M1" photo

A source