9K121 Vikhr

From Wikipedia, the free encyclopedia

9K121 Vikhr
Basic data
Function	air-launched anti-tank missile
Manufacturer	KBP Instrument Design Bureau
Unit cost	Unknown
Entered service	Approx. 1990
General characteristics
Engine	Unknown
Launch mass	45 kg
Length	2.80 m
Diameter	130 mm
Wingspan	380 mm
Speed	600m/s, Mach 1.8
Range	8-10 km
Flying altitude	N/A
Warhead	Armor penetration behind ERA, 1,000 mm
Guidance	Laser beam-riding
Fuzes	Proximity and Impact
Launch platform	Helicopters Ka-50 Ka-52 Aircraft Su-25

9A1472 Vikhr (Russian: Вихрь, English: Whirlwind) is a Russian laser guided anti-tank missile system. "9K121" is the GRAU designation for this system. Its NATO reporting name is AT-16. The missile is air-launched from the Ka-50, Ka-52 helicopters and Su-25 aircraft. It is believed to have entered service around 1990, having been first shown publicly at the 1992 Farnborough Air Show.

The missile is designed to engage vital ground targets, including armoured targets fitted out with built in and add-on explosive reactive armor, at a range of up to 8km when fired from a helicopter and 10 km when fired from a fixed wing aircraft in daytime and up to 5 km at night, as well as air targets in conditions of air defense assets activity.

The Vikhr missile is part of the Vikhr-M system, which also includes an automatic sight and a depressible launcher.

The automatic sight is provided with TV and IR channels of target sighting, a laser beam channel of missile control, a laser rangefinder, an automatic target tracking unit, a digital computer and a system of stabilization and aiming of sighting and beam channels. The automatic sight provides for target detection and identification both day and night, automatic target tracking and missile guidance, and generates exact information for gun and rocket firing. The guided missile is kept in a sealed launching transporting container and consists of a HEAT fragmentation warhead fitted with a contact and a proximity fuze, an air-dynamic control actuator, control electronics, a motor and laser detector.

The multi-purpose warhead (two-stage HEAT and an additional fragmentation belt) allows the missile to be used against armoured, airborne and area targets alike. This is an asset compared to the three different missiles required in the 9M120 Ataka-V complex. The use of the proximity fuze allows a near miss of up to 5 m and makes it possible to engage an air target at speeds of 500m/s.

The Vikhr missile laser beam control system provides for its precise guidance owing to data transmission to the missile in the course of its launch, which is excluded in homing systems. The Vikhr missile control system has high jamming immunity because its receiver faces the carrier, thereby protecting it from jamming signals.

The high pinpoint target hit probability (reported 0.95 against stationary targets) is provided by the automatic target tracking system and highly accurate missile control system that makes allowance for changes in the parameters of the carrier and the target in the course of firing.

The missiles can be fired singly or in pairs (at the same target to increase lethality).

The missiles high-speed flight allows it to engage targets rapidly. The system is capable of launching Vikhr missiles against two to four targets during a 30 second period and starting at a range of 10 km, which increases its fire power potential three to four times or earlier systems.

[edit] Confusion with the 9M120 Ataka-V

There was much confusion toward the end of the 1980s regarding the latest Soviet anti-tank systems. The end of the Cold War cleared much of this up but also lead to a general failure to properly publicise new information. This has resulted in more than ninety percent of books published in the west including incorrect information.

The most common error is simply confusing the 9M120 Ataka-V complex with the 9A1472 Vikhr system. These are completely different systems which have been competing for the Russian market. Mil Moscow Helicopter Plant favours the first, while Sukhoi and Kamov favour the latter. Some foreign Mi-24 derivatives have actually been fitted with the 9A1472 the most reliable way to tell them apart is to look for the number of barrels: eight per launcher for the 9M120 and the fixed wing version of the 9A1472 and six per launcher for the helicopter version of the 9A1472. A four barrel launcher is typical of the Igla short range anti-aircraft missile. Russia does not use currently four barrel launchers for airborne anti-tank systems although this will possibly change with the next generation of missile (which will probably weigh more).

After this error the next most common one is in understanding the guidance systems:
- The 9M120 is radio command SACLOS (Semi-Automatic Command to Line-Of-Sight) and an improved version of the popular 9M114 Shturm system carried on the Mi-24V and some ground units. This system gradually loses accuracy at range (as each as radii view from the launch platform covers more space) but can be fired in any condition where a target can be spotted.
- On the other hand the 9A1472 is a "laser beam riding missile". When this first became known it caused much confusion in the west. Analysts simply assumed that the Soviet designers(KPB Instrument Design) had produced a weapon similar to the AGM-114 Hellfire which uses semi-active laser homing (similar to laser guided bombs). Early artist impressions even went so far as to show what appears to be a minature copy of the Kh-29L (or "AS-14 Kedge" a large semi-active laser guided missile that borrows its aerodynamic design from the R-73).

When the first good photographs appeared they lead to still more confusion: There was no visible seeker (causing some to believe it to be an unguided rocket system).

All of this was a long way from the mark: Instead of the NATO's expensive and delicate technology Russia had developed very different approach. A series of non-imaging detectors face-backward from the missile toward the launch platform and guide the missile toward the centre of the laser beam (unlike semi-active laser seekers which aim for laser light reflect off of the target). This is much cheaper and also more resistant to countermeasures. To capitalise on this cost advantage the Soviet designers produced a new control system:

Fixed fins cause the missile to spin in flight and a single moving control surface adjust its course during this rotation. The result is that for the same price the West could build one missile whereas the Soviets could to build five. Any loss of effectiveness being counteracted by pilots being encouraged to fire their missiles in pairs.