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〕 (2011) 11.2m(FY2014) (Block 1B) |propellant=Stage 1: MK 72 Booster, solid-fuel, Aerojet Stage 2: MK 104 Dual Thrust Rocket Motor (DTRM), solid-fuel, Aerojet Stage 3: MK 136 Third Stage Rocket Motor (TSRM), solid-fuel, ATK Stage 4: Throttleable Divert and Attitude Control System (TDACS), () |production_date= |service= |engine= |weight=1.5 t |length=6.55 m (21 ft 6 in) |height= |diameter= 34.3 cm (13.5 in) for Block I missiles 53.3 cm (21 in) for Block II |wingspan= 1.57 m (62 in) |speed= 3 km/s (Mach 10.2) Block IA/B 4.5 km/s (Mach 15.25) Block IIA |vehicle_range= 700 km (378 miles) Block IA/B 2500 km (1350 miles) Block IIA 〔 |ceiling= 500 km (311 miles) Block IA/B 1500 km (933 miles) Block IIA 〔 |altitude= |filling=Lightweight Exo-Atmospheric Projectile (LEAP) kinetic warhead |guidance=GPS/INS/semi-active radar homing/passive LWIR infrared homing seeker (KW) |detonation= |launch_platform= }} The RIM-161 Standard Missile 3 (SM-3) is a ship-based missile system used by the United States Navy to intercept short-to intermediate-range ballistic missiles as a part of Aegis Ballistic Missile Defense System.〔(Raytheon Completes SM-3 Test Flight Against Intermediate Range Ballistic Missile ), Raytheon Company, Retrieved 6 September 2011〕 Although primarily designed as an anti-ballistic missile, the SM-3 has also been employed in an anti-satellite capacity against a satellite at the lower end of low Earth orbit.〔Pentagon news briefing of February 14, 2008 ((video ), (transcript )): although no name for the satellite is given, the launch date of December 14, 2006 is stated〕 The SM-3 is primarily used and tested by the United States Navy and also operated by the Japan Maritime Self-Defense Force. ==Motivation and development== The SM-3 evolved from the proven SM-2 Block IV design. The SM-3 uses the same solid rocket booster and dual thrust rocket motor as the Block IV missile for the first and second stages and the same steering control section and midcourse missile guidance for maneuvering in the atmosphere. To support the extended range of an exo-atmospheric intercept, additional missile thrust is provided in a new third stage for the SM-3 missile, containing a dual pulse rocket motor for the early exo-atmospheric phase of flight.〔(【引用サイトリンク】url=http://www.globalsecurity.org/space/systems/sm3-upgrades.htm )〕 Initial work was done to adapt SM-3 for land deployment ("Aegis ashore") to especially accommodate the Israelis, but they then chose to pursue their own system, the NATO code-name Arrow 3. A group in the Obama administration envisioned a European Phased Adaptive Approach (EPAA) and SM-3 was chosen as the main vector of this effort because the competing U.S. THAAD does not have enough range and would have required too many sites in Europe to provide adequate coverage. Compared to the GMD's Ground-Based Interceptor however, the SM-3 Block I has about to of the range. A significant improvement in this respect, the SM-3 Block II variant widens the missile's diameter from 0.34 m (13.5 in) to .53 m (21 in), making it more suitable against intermediate-range ballistic missiles. The Block IIA missile is largely new sharing only the first-stage motor with the Block I. The Block IIA was "designed to allow for Japan to protect against a North Korean attack with fewer deployed ships" but it is also the key element of the EPAA phase 3 deployment in Europe. The Block IIA is being jointly developed by Raytheon and Mitsubishi Heavy Industries; the latter manages "the third-stage rocket motor and nose cone". The U.S. budgeted cost to date is $1.51 billion for the Block IIA.〔(MDA Still Sees 2018 Deployment In Restructured SM-3 IIA Plan )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「RIM-161 Standard Missile 3」の詳細全文を読む スポンサード リンク
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