RIM-162 ESSM

The original Sea Sparrow was an expedient design intended to provide short-range defensive fire in a system that could be deployed as rapidly as possible. The AIM-7 Sparrow was the simplest solution as its radar guidance allowed it to be fired head-on at targets and this guidance was easily provided by mounting an aircraft radar on a trainable platform. In the years after its introduction, it was upgraded to follow improvements being made in the air-to-air Sparrow models used by the US Navy and US Air Force. The ultimate version in this line of weapons was the R model, which introduced a new dual-seeker homing system and many other upgrades. After that point, the AIM-120 AMRAAM offered higher performance from a missile that was smaller and lighter, and development of the Sparrow ended in the 1990s.

This left only the Sea Sparrow using the basic platform, and it no longer had to fit on aircraft. So instead of simply using the P and R models as they were, it was decided to dramatically upgrade the weapon as the Evolved SeaSparrow. The ESSM emerged as a completely new weapon, common only in name with the original, although using all of the same support equipment allowing it to be fit to ships already mounting the older models. Compared to the Sea Sparrow, ESSM has a larger, more powerful rocket motor for increased range and agility, as well as upgraded aerodynamics using strakes and skid-to-turn. In addition, ESSM takes advantage of the latest missile guidance technology, with different versions for Aegis/AN/SPY-1, Sewaco/Active Phased Array Radar (APAR), and traditional target illumination all-the-way.

In the 2000s the NATO Seasparrow Project Office began planning an upgraded Block 2 version of the ESSM. In 2014 Canada pledged 200M CAD to underwrite their share of the Block 2's development cost.[9] ESSM Block 2 leverages the existing Block 1 rocket motor and features a dual-mode X band seeker, increased maneuverability, and other enhancements. Block 2 features enhanced communications systems that allow for mid-course guidance correction, which makes the missiles easy to network into the Navy's emerging Cooperative Engagement Capability.[10] Unlike Block 1, Block 2's active radar homing seeker will support terminal engagement without the launch ship's target illumination radars. The upgraded blast-fragmentation warhead was designed, developed and is being produced by Roketsan. The improved ESSM Block II will be fielded by the US Navy from 2020.[11][12]

AMRAAM-ER

The AMRAAM-ER is an Extended Range upgrade to the AIM-120 AMRAAM missile for the NASAMS ground-based air defense system, which combines ESSM rocket motor with the AMRAAM two-stage seeker head.[15]

The Australian frigate HMAS Ballarat firing two ESSMs in 2016

US operational evaluation was conducted in July 2002 aboard USS Shoup. Initial operational capability did not occur until later.[16]

In October 2003, at the USN Pacific Missile Range Facility near Hawaii, Australian frigate HMAS Warramunga conducted a successful firing of an ESSM. The firing was also the first operational use of the CEA Technologies CWI for guidance.[17][18]

In November 2003, approximately 200 nautical miles (370 km) from the Azores, the Royal Netherlands Navy (RNLN) frigate HNLMS De Zeven Provinciën conducted a live fire test of a single ESSM. This firing was the first ever live firing involving a full-size ship-borne active electronically scanned array (i.e. the APAR radar) guiding a missile using the Interrupted Continuous Wave Illumination (ICWI) technique in an operational environment.[19] As related by Jane's Navy International:

During the tracking and missile-firing tests, target profiles were provided by Greek-built EADS/3Sigma Iris PVK medium-range subsonic target drones. [...] According to the RNLN, ... "APAR immediately acquired the missile and maintained track until destruction". [...] These ground-breaking tests represented the world's first live verification of the ICWI technique.[20]

In August 2004, a German Navy Sachsen-class frigate completed a series of live missile firings at the Point Mugu missile launch range off the coast of California that included a total of 11 ESSM missile firings.[20] The tests included firings against target drones such as the Northrop BQM-74E Chukkar III and Teledyne Ryan BQM-34S Firebee I, as well as against missile targets such as the Beech AQM-37C and air-launched Kormoran 1 anti-ship missiles.[20]

Further live firings were performed by the RNLN frigate HNLMS De Zeven Provinciën in March 2005, again in the Atlantic Ocean approximately 180 nautical miles (330 km) west of the Azores.[20] The tests involved three live-firing events (two of which involved the ESSM) including firing a single SM-2 Block IIIA at an Iris target drone at long range, a single ESSM at an Iris target drone, and a two-salvo launch (with one salvo comprising two SM-2 Block IIIAs and the other comprising two ESSMs) against two incoming Iris target drones.[20]

All ESSM launches from De Zeven Provinciën and Sachsen-class frigates involved ESSMs quad-packed in a Mark 41 Vertical Launching System.

The first "kill" by the RIM-162D from a United States Navy carrier's Mk 29 launcher was achieved during a training exercise by USS John C. Stennis on 7 October 2008.[21]

On 14 May 2013, the ESSM intercepted a high-diving supersonic test target, demonstrating the ability to hit high-G maneuvering, low-velocity air threats, as well as surface targets. No software changes were needed to prove the ESSM's enhanced capability.[22]

On 30 August 2015, during the annual 'Co-operation Afloat Readiness and Training' ('CARAT') exercise, the ESSM was fired from the Royal Thai Navy Naresuan-class guided-missile frigate HTMS Naresuan and achieved a direct hit on a BQM-74E drone missile launched from the USN amphibious dock landing ship USS Germantown.[23]

On 9 October 2016, USS Mason fired one RIM-162 ESSM and two SM-2s to defend against two incoming Houthi anti-ship cruise missiles, potentially Chinese-built C-802 missiles. It is unknown if the RIM-162 was responsible for intercepting either of the missiles, but the incident marked the first time the ESSM was used in a combat situation.[24]

In 2018, the ESSM Block 2 passed its first live fire test, successfully intercepting a BQM-74E target drone using its active guidance seeker-head.[25]

The Spanish frigate Álvaro de Bazán launches an ESSM to intercept a simulated enemy missile during exercise Formidable Shield 2017

Source: US Navy—Fact File: Evolved Seasparrow Missile[26]

ESSM Consortium Members:

•  Australia
•  Canada
•  Denmark
•  Germany
•  Greece
•  Netherlands
•  Norway
•  Spain
•  Turkey
•  United States

Foreign Military Sales (FMS):

•  Belgium
•  Chile
•  Finland[27][28]
•  Japan
•  Mexico[29]
•  Portugal
•  Thailand
•  United Arab Emirates

• K-SAAM
• CAMM (missile family)
• HQ-16
• Buk missile system
• VL-SRSAM
• List of missiles

Wikimedia Commons has media related to RIM-162 Evolved Sea Sparrow.

• Designation Systems.net: Raytheon RIM-162 ESSM
• NATO SEASPARROW Project Office
• NAMMO Raufoss - Nordic Ammunition Company