Ugroza is a precision-guided

Precision-guided munition

A precision-guided munition is a guided munition intended to precisely hit a specific target, and to minimize damage to things other than the target....

 weapons system made in Russian Federation. It is an upgrade for standard Russian "dumb" rockets, including the S-5

S-5 rocket

The S-5 is a rocket weapon developed by the Soviet Air Force and used by military aircraft against ground area targets...

, S-8

S-8 rocket

The S-8 is a rocket weapon developed by the Soviet Air Force for use by military aircraft. It remains in service with the Russian Air Force and various export customers....

, and S-13 rocket

S-13 rocket

The S-13 is a 122 mm calibre unguided rocket weapon developed by the Soviet Air Force for use by military aircraft. It remains in service with the Russian Air Force and some other countries....

s. The system upgrades the "dumb" rockets with laser guidance

Laser guidance

Laser guidance is a technique of guiding a missile or other projectile or vehicle to a target by means of a laser beam. Some laser guided systems utilise beam riding guidance, but most operate more similarly to semi-active radar homing . This technique is sometimes called SALH, for Semi-Active...

, very significantly increasing their accuracy. It requires a laser target designator, from either an airborne or land based source, to "paint" a target. Circular error probable

Circular error probable

In the military science of ballistics, circular error probable is an intuitive measure of a weapon system's precision...

 (CEP) is about 0.8 to 1.8 m, while maximum ranges of rockets varies from the rockets used 1.5–8 km. Ugroza allows rockets to be ripple-fired up to 7 at a time.

The notable novelty is that the system does not use aerodynamic flight control (e.g. tail fins), but impulse steering

Reaction control system

A reaction control system is a subsystem of a spacecraft whose purpose is attitude control and steering by the use of thrusters. An RCS system is capable of providing small amounts of thrust in any desired direction or combination of directions. An RCS is also capable of providing torque to allow...

 with mini-thrusters. It has been dubbed as the Russian concept of impulse corrections (RCIC).

The concept has been demonstrated by Ametech on 1999 MAKS airshow

MAKS Airshow

MAKS is an International Air Show held near Moscow, Russia on Zhukovskiy LII air field. The first show, Mosaeroshow-92, was held in 1992. Since 1993, it was renamed to its current name and is held on odd years .MAKS is an important event in Russian business...

, but it is not known if the system has been manufactured since, and in what numbers. The name Ugroza (sometimes transliterated Ugrosa), have been first used for the company's semi-active laser-guided projectile (SAL-GP) for the 122 mm BM-21 Grad series of multiple rocket launcher

Multiple rocket launcher

A multiple rocket launcher is a type of unguided rocket artillery system. Like other rocket artillery, multiple rocket launchers are less accurate and have a much lower rate of fire than batteries of traditional artillery guns...

s (it did not enter production and have been shelved as of 2010).

Sources are not clear whether in place of laser guidance can optical (TV) guidance be used.

The designation of rockets upgraded with Ugroza are given the suffix "Kor" (from Russian корректируемые, meaning "correctable"):

• S-5Kor
• S-8Kor
• S-13Kor