AGM-45 Shrike

AGM-45 Shrike
An AGM-45 being fired by a Navy A-4 Skyhawk
Type	Air-to-surface anti-radiation missile
Place of origin	United States
Service history
In service	1965–1992
Wars	Vietnam War,[1] Yom Kippur War,[2] Falklands War, Operation El Dorado Canyon, Gulf War
Production history
Designed	1963
Specifications
Weight	390 pounds (177.06 kg)
Length	10 feet (3.05 m)
Diameter	8 inches (203 mm)
Warhead	67.5 kg (149 lb) MK 5 MOD 1 (or MK 86 MOD 1) blast-fragmentation, or 66.6 kg (147 lb) WAU-9/B blast-fragmentation
Wingspan	3 feet (914 mm)
Speed	Mach 1.5
Guidance system	Passive radar homing
Launch platform	A-4 Skyhawk, A-6 Intruder, F-105 Thunderchief, F-4 Phantom II, Avro Vulcan (not regular service)

AGM-45 Shrike is an American anti-radiation missile designed to home in on hostile anti-aircraft radar. The Shrike was developed by the Naval Weapons Center at China Lake in 1963 by mating a seeker head to the rocket body of an AIM-7 Sparrow. It was phased out by U.S. in 1992^[1] and at an unknown time by the Israeli Air Force (the only other major user), and has been superseded by the AGM-88 HARM missile. The Israel Defense Forces developed a version of the Shrike that could be ground-launched and mounted it on an M4 Sherman chassis as the Kilshon (Hebrew for Trident).^[1][3]

History

The Shrike was first employed during the Vietnam War by the Navy in 1965 using A-4 aircraft. The Air Force adopted the weapon the following year using F-105F and G Thunderchief Wild Weasel SEAD aircraft, and later the F-4 Phantom II in the same role. The range was nominally shorter than the SA-2 Guideline missiles that the system was used against, although it was a great improvement over the early method of attacking SAM sites with rockets and bombs from F-100F Super Sabres. A Shrike was typically lofted about 30 degrees above the horizon at a Fan Song radar some 15 miles (25 km) away for a flight time of 50 seconds. Tactics changed incrementally over the campaigns of 1966 and 1967 until the advent of the AGM-78 Standard ARM. This new weapon allowed launches from significantly longer range with a much easier attack profile, as the ARM could be launched up to 180 degrees off target and still expect a hit and its speed allowed it to travel faster than the SA-2. Even after the AGM-78 entered service, the Weasels still carried the Shrike because the ARM cost about $200,000, while a Shrike cost only $7,000. If USAF pilots expended an ARM they would have to fill out a lengthy form during debriefing. A somewhat standard load for the F-105G was a 650 US gal (2,500 L) centerline fuel tank, two AGM-78s on inboard pylons and two Shrikes on the outboards. The mix varied slightly for jamming pods and the occasional AIM-9 Sidewinder but this was the baseline.

Shrike was involved in a friendly fire incident during a 15 April 1972 airstrike on Haiphong. Two missiles struck USS Worden (CG-18) killing one crewman and injuring nine more. An American pilot apparently interpreted the PIRAZ cruiser's AN/SPG-55 radar as a North Vietnamese SAM site. Worden required ten days shipyard work at the Subic Bay Naval Base to repair the damage.^[4]

Although the Shrike missile did not enter regular service with the United Kingdom, it was supplied to the RAF for use in the Falklands War of 1982. RAF Shrikes were fitted to modified Vulcan bombers in order to attack Argentinian radar installations during Operation Black Buck. The main target was a Westinghouse AN/TPS-43 long range 3D radar that the Argentine Air Force deployed during April to guard the Falklands' surrounded airspace. The Argentine operators were aware of the anti-radar missiles and would simply turn it off during the Vulcan's approaches. This radar remained intact during the whole conflict. However, air defences remained operational during the attacks and the Shrikes hit two of the less valuable and rapidly replaced secondary fire control radars. Also, following a Vulcan making an emergency landing at Rio de Janeiro, Brazilian authorities confiscated one Shrike which was not returned.^[5]

About 95 AGM-45s were used in 1991 during Desert Storm against Iraqi air defense, mostly by F-4Gs.^[6]

Variants

The Shrike's limitations are characterized primarily in the fact that subvariants abound, each tuned to a different radar band. Angle gating, used to prioritize targets, was included in every subvariant of the AGM-45A and B after the A-2 and B-2. It was also slow and the lack of punch in the warhead made it difficult for bomb damage assessment, as well as inflicting any damage to the Fan Song Radar vans beyond a shattered radar dish, an easy item to replace or repair. The short range, combined with its lack of speed (compared to the SA-2 SAM) made for a difficult attack. The missile had to be well within the range of the SAM and if a SAM was fired the SAM would get to the aircraft first. Also the missile had few tolerances and had to be launched no more than + or − 3 degrees from the target. Many pilots in Vietnam did not like the Shrike because of its limitations and its success rate of around 25%.

The differences between the AGM-45A and B are in the rocket motor used, and in the warheads capable of being fitted. The AGM-45A used the Rocketdyne Mk 39 Mod 0 (or apparently in some cases the Aerojet Mk 53 Mod 1) motor, while the AGM-45B used Aerojet Mk 78 Mod 0 which greatly increased the range of the missile. As for warheads, the Mk 5 Mod 0, Mk 86 Mod 0, and WAU-8/B could all be fitted to the AGM-45A and were all blast-fragmentation in nature. The AGM-45B made use of the improved Mk 5 Mod 1 and Mk 86 Mod 1 warheads, as well as, the WAU-9/B, again all blast-fragmentation in type.

The following table provides information on what radar bands were associated with certain guidance sections, and the subvariant designation.

A Shrike hitting a simulated target.

Designation	Guidance Section	Targeted Bands
AGM-45A-1	Mk 23 Mod 0	E/F Band
AGM-45A-2 AGM-45B-2	Mk 22 Mod 0/1/2	G Band
AGM-45A-3 AGM-45B-3	Mk 24 Mod 0/1/34	Broad E/F Band
AGM-45A-3A AGM-45B-3A	Mk 24 Mod 2/5	Narrow E/F Band
AGM-45A-3B AGM-45B-3B	Mk 24 Mod 3	E/F Band
AGM-45A-4 AGM-45B-4	Mk 25 Mod 0/1	G Band
AGM-45A-6 AGM-45B-6	Mk 36 Mod 1	I Band
AGM-45A-7 AGM-45B-7	Mk 37 Mod 0	E/F Band
AGM-45A-9 AGM-45B-9	Mk 49 Mod 0	I Band
AGM-45A-9A AGM-45B-9A	Mk 49 Mod 1	I Band, "G bias"
AGM-45A-10 AGM-45B-10	Mk 50 Mod 0	E Band to I Band

For unknown reasons, -5 and -8 were not produced.

See also

• International Signal and Control

References

1. http://www.vectorsite.net/twbomb_09.html#m2
2. Spencer Tucker, The encyclopedia of the Arab-Israeli conflict: a political, social, and military history. A - F, Volume 1, 2008, ABC-CLIO, p. 685
3. http://www.israeli-weapons.com/weapons/vehicles/self_propelled_artillery/kilshon/Kilshon.html
4. "Worden (DLG-18) IV". Naval History and Heritage Command. United States Navy. Retrieved 8 September 2015.
5. http://www.raf.mod.uk/history/OperationBlackBuck.cfm
6. http://www.harpoondatabases.com/encyclopedia/Entry693.aspx

External links

• The AGM-45 Shrike at Designation Systems.net