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Zvezda Kh-25MP


NATO: AS-12 Kegler


Overview


Kh-25MP / AS-12 Kegler

Kh-25MP fitted on Su-17 series ground attack fighter.

Source: Miroslav Gyürösi - © Copyright lies with original owner

Origin
Soviet Union
Type
Anti-radiation missile
Entered service
1980's
Status
In service
Development
1978 - ?
Developer
Soviet Union - OKB Zvezda
Production
Soviet Union - Zvezda-Strela
Russia - Zvezda-Strela
Designations
AS-12 Kegler
NATO reporting name
Izdeliye 72
Product index of Kh-27
Izdeliye 711
Product index of Kh-25MP

Description


Introduction

The Kh-25MP is an air-launched anti-radiation missile of Soviet origin. It was developed in the 1970's as a lightweight and short range anti-radiation missile for use by frontline aviation. In the West it is known by the NATO reporting name "AS-12 Kegler". The main role of the Kh-25MP is to improve the ability for frontline aviation to operate by suppressing enemy short range air defense systems.

Design

The Kh-25MP is based on the airframe of the Kh-25 series of air to ground missiles. The Kh-25 series is known in the West as the AS-10 Karen. The Kh-25MP differs in having a passive radar homing seeker. Externally the Kh-25MP can be distinguished by the pointy nosecone and double forward fins. The seeker has a standalone target acquisition ability. The advantage is that the integration effort with aircraft types is limited and the missile can be used on many platforms. A drawback is that the pilot cannot select what target to engage. Nor is it practical to engage multiple targets with different missiles at the same time.

Guidance

The Kh-25MP series feature passive homing radar seekers. The seekers are optimized for specific targets. The abilities differ significantly per variant of the missile. Early prototypes could only be used against MIM-14 Nike-Hercules. The more common Kh-25MP variant has a modular warhead. Before take-off one of two types of seekers is installed. The Kh-25MP adds the ability for use against Hawk and I-Hawk. The Kh-25MPU has a fixed wide range seeker and can also be used against Crotale and Roland. The MPU also has an inertial navigation module that allows the missile to stay on course when the target radar is temporarily shut off, but is not precise enough to accurately strike the last known position when the radar is not turned on anymore.

Launch platforms

The Kh-25MP can be used with a wide variety of aircraft. The most common platform are the M3 and M4 variants of the Su-17 series, including the Su-22 export models. Several variants of the Su-25 can launch the missile as well. The MiG-23BN and MiG-27 ground attack fighters are also able to launch the missile. Su-24M and MiG-29M/K are launch platforms, but seldomly carry the Kh-25MP. A single missile is carried on an APU-68 or APU-68UM launch rail. Often two missiles are carried per launch aircraft.

Users

The Kh-25MP was adopted by Soviet forces and remains in limited use with Russia today. It has been exported to several nations with ties with the Soviet Union. In Russian service the Kh-25MP has been mostly replaced by the more capable and flexible Kh-58, known in the West as the AS-11 Kilter.

Details


Kh-25MP / AS-12 Kegler

Line diagram of Kh-25MP, shown with both types of sensor.

Source: Unknown author - © Copyright lies with original owner

Overview of variants

Kh-27PS
First iteration of the anti-radiation variant of the Kh-25 series of missiles. The designations Kh-27 and Kh-27M are also used. Quickly supplemented and replaced by the improved Kh-25MP.
Kh-25MP
Modular anti-radiation missile. The two types of passive radar seekers, the PRGS-1VP or PRGS-2VP, can be fitted. These are optimized for use against Hawk and I-Hawk. Maximum range is similar to Kh-27, but minimum range has been reduced by more than half.
Kh-25MPU
Improved version of the Kh-25MP. Features a new seeker type that can track a wide range of radar frequencies. Therefore it can also engage Roland and Crotale systems. An inertial guidance system was added. This allows the missile to continue in the general direction of the last known location in case the target radar is temporarily shut off.
Facts Kh-25MP
General
Origin
Soviet Union
Type
Anti-radiation missile
Dimensions
Length
4.19 m for Kh-25MP with PRGS-1VP seeker
4.29 m for Kh-25MP with PRGS-2VP seeker
4.30 m for Kh-25MPU
Diamter
276 mm
Wingspan
755 - 820 mm
Weight
310 kg for Kh-25MP
320 kg for Kh-25MPU
Guidance
Guidance type
Passive radar homing
Guidance unit
Modular exchangeable seekers for Kh-25MP
Variable range seeker for Kh-25MPU
Warhead
Warhead type
High explosive fragmentation
Warhead weight
89.6 kg on Kh-25MP
86 kg on Kh-25MPU
Engagement envelope
Range
3 to 40 km for Kh-25MPU
Max speed
850 - 920 m/s
Average speed
400 - 500 m/s
Launch altitude
50 m to 10 km
Launch aircraft speed
600 - 1.250 km/h