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The RIM-174 Standard Extended Range Active Missile (ERAM), or Standard Missile 6 (SM-6) is a missile in current production for the United States Navy. It was designed for extended range anti-air warfare (ER-AAW) purposes providing capability against fixed and rotary-wing aircraft, unmanned aerial vehicles, and anti-ship cruise missiles in flight, both over sea and land. The missile uses the airframe of the earlier SM-2ER Block IV (RIM-156A) missile,〔(Raytheon Missile Systems Standard Missile 6 ), Accessed February 10, 2011.〕 adding the active radar homing seeker from the AIM-120C AMRAAM in place of the semi-active seeker of the previous design. This will improve the capability of the Standard missile against highly agile targets, and targets beyond the effective range of the launching vessels' target illumination radars. Initial operating capability was planned for 2013 and has been successfully achieved on November 27, 2013.〔http://www.navsea.navy.mil/NewsView.aspx?nw=NewsWires&id=337〕 The SM-6 is not meant to replace the SM-2 series of missiles, alongside which it will serve, but does give extended range and increased firepower.〔(Non-Standard: Navy SM-6 Kills Cruise Missiles Deep Inland ) - Breakingdefense.com, 19 August 2014〕 ==Description== The Standard ERAM is a two-stage missile with a booster stage and a second stage. It is similar in appearance to the RIM-156A Standard missile. The radar seeker is an enlarged version adapted from the AIM-120C AMRAAM seeker (13.5 inches versus 7 inches). The missile may be employed in a number of modes: inertial guided to target with terminal acquisition using active radar seeker, semi-active radar homing all the way, or an over the horizon shot with Cooperative Engagement Capability. The missile is also capable of terminal ballistic missile defense as a supplement to the Standard missile three (RIM-161). Unlike other missiles of the Standard family, the Standard ERAM can be periodically tested and certified without removal from the VLS cell. The SM-6 offers extended range over previous SM-2 series missiles, primarily being able to intercept very high altitude or sea-skimming anti-ship missiles; the missile is also capable of performing terminal phase ballistic missile defense. It can discriminate targets using its dual-mode seeker, with the semi-active seeker relying on a ship-based illuminator to highlight the target, and the active seeker having the missile itself send out an electromagnetic signal; the active seeker has the ability to detect a land-based cruise missile amid ground features, even from behind a mountain. The multi-mission SM-6 is engineered with the aerodynamics of an SM-2, the propulsion booster stack of the SM-3, and the front end configuration of the AMRAAM.〔(Navy Missile Hits Subsonic Target Over Land ) - Defensetech.org, 20 August 2014〕 The Navy is adding the Global Positioning System (GPS) to the SM-6 so it has the capability to strike stationary land targets if needed, but given its higher cost than other land attack weapons like the BGM-109 Tomahawk it would not likely be used as a primary option.〔(Pit LRASM Against Tomahawk For Anti-Ship Missile: VADM Aucoin ) - Breakingdefense.com, 5 August 2015〕 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-174 Standard ERAM」の詳細全文を読む スポンサード リンク
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