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Warships employ Integrated countermeasures and electronic warfare to ward off missile threats

The US Warship ‘USS Mason’ was targeted by two missiles off the coast of Yemen on Sunday but missed the vessel and hit the water instead, a Pentagon spokesman said. The missiles were fired at the USS Mason from Houthi-controlled territory in war-torn Yemen, Capt. Jeff Davis said, adding that the guided-missile destroyer deployed “onboard defensive measures” and was undamaged. But the Houthis — a minority Shia group that has taken control of much of Yemen, including the capital have denied that its forces had targeted the warship.

The Saudi-led coalition, involving several Arab countries, began a military campaign in Yemen in March 2015 after Houthis drove out the US-backed government, led by President Abdu Rabbu Mansour Hadi, and took over Sanaa. The crisis quickly escalated into a multisided war, which allowed al Qaeda and ISIS — other enemies of the Houthis — to grow stronger amid the chaos, reports CNN. The conflict has killed an estimated 10,000 Yemenis and left millions in need of aid, according to the United Nations.

The Falklands conflict was first that really alerted navies to the power of the sea-skimmer, when 3 Royal Navy ships were hit by Exccet anti-ship missiles. Naval Warships now faces wide spectrum of threats from hypersonic missiles, ballistic and cruise missiles, cavitating torpedoes, rail guns, lasers and UAVs. Anti-Ship Missiles are guided missiles most of them of the sea skimming variety, and many use a combination of inertial guidance and active radar homing. A good number of other anti-ship missiles use infrared homing to follow the heat that is emitted by a ship; it is also possible for anti-ship missiles to be guided by radio command all the way.

Each class of ship has multiple close, medium, and long-range weapons and countermeasures to address the threat. In the case of the Mason, they used Standard Missile 2 (SM-2) and Enhanced Sea Sparrow Missiles to “splash” the missiles. The SM-2 and ESSM are medium range missiles stored in the ship’s Vertical Launch System cells, along with Tomahawks and other weapon systems., writes Shawn VanDiver a 12-year Navy veteran. ESSMs are unique in that each VLS cell can hold 4 of the missiles, meaning Navy ships can hold several to protect themselves or the units around them. If the missiles made it through those defenses, or were fired closer, the shipboard Phalanx Close-In Weapons System — also known as the CIWS (pronounced “sea-wiz”) — would engage it.

Naval ships employ a variety of soft countermeasures to protect themselves from the missiles. They may include Jamming, spoofing and even cyber warfare techniques as defence against missiles.

Electronic countermeasures

Electronic warfare provide means to counter adversary’s systems while protecting one’s own systems through Electronic Attack (EA), Electronic Protection (EP) and Electronic Support (ES). EA is the electronic countermeasure which includes jamming and deception of enemy radars, electro-optic and communication systems.

Electromagnetic weapons can destroy, intercept or jam approaching enemy missiles, drones, rockets or aircraft at much lesser cost than firing an interceptor missile which can cost up to hundreds of thousands of dollars. This tactic would both force enemies to spend money on expensive weapons while decreasing the offensive and defensive weaponry costs to the U.S., therefore advancing a “cost-imposing” strategy, as Cabiness explained.

Soft kill – decoys

Modern Warships have launchers for a variety of decoys including basic chaff (metal strips to confuse radar) and flares to decoy infra-red sensors.

An infrared countermeasure (IRCM) is a device designed to protect aircraft from infrared homing (“heat seeking”) missiles by confusing the missiles’ infrared guidance system so that they will miss their target. One of the common countermeasures against IR seeking missiles are the Flares that create infrared targets with a much stronger signature than the aircraft’s engines. The flares provide false targets that cause the missile to make incorrect steering decisions. The missile will rapidly break off a target lock-on.

Royal Navy’s Type 45 and 23/26 also have launchers for floating decoys designed to simulate a ship’s radar signature. With seconds to react it takes considerable skill to select which type of decoy to use and where to position it.


Nulka Active Missile Decoy

Developed in cooperation with Australia, Nulka can be used for stand-alone ship protection, or as part of a multi-layer defense system. It is intended to counter a wide spectrum of present and future radar-guided Anti-Ship Missiles (ASMs).

After launch, the Nulka decoy radiates a large, ship-like radar cross section while flying a trajectory that lures ASMs away from their intended targets. Australia developed the hovering rocket while the U.S. developed the electronic payload.

The system is effective over a full 360 degrees around the defended ship. The effectiveness of the decoy is wholly independent of ship maneuvers even in the most extreme environmental conditions.

This decoy weapon system can be commanded automatically or manually by the ship’s EW system or weapons control system. On receiving an ASM threat warning, the relative missile(s) angle of arrival and ship’s positional data are used to preprogram the decoy via the Decoy Launch Processor (DLP). The DLP computes the best launcher to use and an optimized flight path for the selected decoy. The flight path data is communicated to the decoy Flight Control Unit prior to launch. At launch, the decoy payload immediately begins to engage the ASM seeker.

Our Nulka Countermeasures system adds yet another layer to a ship’s layered self-defense system against radio-frequency anti-ship missile attacks. The Nulka decoy simulates the radar return from a large ship overlapping the target signal. To an enemy radio-frequency anti-ship missile, it’s a more attractive target instead. For U.S. and allied ships, it’s the smartest and most reliable way to draw missile fire away from our fleet and defeat the threat.


ONR working on a new electro-optical defense for Navy ships

Office of Naval Research has planned, “ The Combined EO/IR Surveillance and Response System, or CESARS,” program, intended primarily to defend against optically guided anti-ship missiles and fast attack crafts, with unmanned aerial vehicles seen as a secondary threat, according to a presolicitation issued by ONR.

There are two distinct functions that constitute CESARS: Shipboard Panoramic EO/IR Cueing and Surveillance System (SPECSS) and Multispectral EO/IR Countermeasures for Advanced Threats (MEIRCAT). The primary function of SPECSS is to perform wide field-of-view target detection and tracking, with subsequent cueing of MEIRCAT high-resolution sensors.

The functions of the MEIRCAT system are target re-acquistion, tracking, classification/identification, 3-D ranging, threat assessment, CM execution and CM effectiveness monitoring (CMEM). Multi-band capability against multiple targets in a single engagement is required for MEIRCAT. MEIRCAT should be able to provide multiband capability against multiple targets at a time.


The overall CESARS system therefore must provide the following basic capabilities:

•Wide field-of-view (WFOV) situational awareness across multiple wavebands
•Automated multi-target detection, tracking, and cueing algorithms
•Video data acquisition, dissemination, recording, processing, and display
•High resolution classification, identification and tracking in multiple wavebands
•Integrated, precise, and real-time, active-and-passive fine tracking (including range) in multiple wavebands
•Enhanced CM capability against current and advanced multi-band EO/IR threats
•Provide precise 3_D ranging and CMEM information to the shipboard combat system


MEIRCAT high-resolution target identification and tracking cameras: MERICAT comprises high resolution LWIR, MWIR, and visible spectrum sensors. MEIRCAT sensing shall include a multi-band, high-resolution, high-frame-rate capability to support the target classification/identification, active and passive tracking, and CMEA functions.

MEIRCAT Beam Control, Pointing and Processing system includes turret/gimbal, optical bench, and window(s). The  contractor shall supply Inertial Measurement Unit(s) required for tracking ship motion so that the target tracking is maintained.

The MEIRCAT software shall include countermeasure processing, transceiver to gimbal control, and system control processing. The MEIRCAT software must maintain relative coordinates of both imaging systems and targets in the ship coordinate system and provide high repetition rate line-of-sight (LOS) angular and range data for potential targets to Fire Control.

US Navy continuous upgrades for shipboard electronic warfare system

Last year, Northrop Grumman was awarded a $267m contract by the US Navy to develop and manufacture the next-generation SEWIP Block 3 system. SEWIP Block 3 will provide Electronic Attack (EA) capability improvements required for the AN/SLQ-32(V) system to keep pace with the threat. The SEWIP Block 3 solution features active and passive arrays, and electronic warfare and communications functions with continuous 360° coverage. Designed to easily interact with the combat management system, the system’s multi-mission technology provides unprecedented situational awareness to detect, track and engage threats in high-clutter environments.

In contrast to traditional systems designed to operate in a narrow range of frequencies against known threats, “SEWIP Block 3 brings active electronic attack across a wider frequency range…with digital processing that will facilitate new ‘intelligent’ EW processing that will enable the system to react to signals it has never seen before,” said retired Navy commander Bryan Clark, now with the Center for Strategic and Budgetary Assessments. “SEWIP Block 3’s AESA array enables it to be a passive sensor, communication array, or a radar,” he added. “It could also confuse or obscure aircraft and ship radars” as part of the Navy’s new “electromagnetic maneuver warfare” concept.

Traditionally, ships try to shoot down incoming missiles with their own interceptor missiles at the longest possible range, Clark says, but long-range interceptors are expensive and bulky, and ships can’t carry enough — nor can the Navy afford enough — to fend off a Chinese or Russian-style mass salvo. That puts a premium on “non-kinetic” systems that can keep shooting as long as they have electrical power, like the Navy’s prototype laser or the SEWIP Block 3 jammer.

The SEWIP Block 3 enhancements for the shipboard AN/SLQ-32 will be provided through a series of upgrades that will involve the addition of new technologies and capabilities for early detection, signal analysis, threat warning and protection from anti-ship missiles.

SEWIP Block 4 is a future planned upgrade that will provide advanced electro-optic and infrared capabilities to the AN/SLQ-32(V) system.

The U.S. Navy awarded the Lockheed Martin an initial $148.9M contract for full rate production of Surface Electronic Warfare Improvement Program (SEWIP) Block 2 systems with four additional option years to upgrade the fleet’s electronic warfare capabilities so warfighters can respond to evolving threats.

Under this full-rate production contract, Lockheed Martin will provide additional systems to upgrade the AN/SLQ-32 systems on U.S. aircraft carriers, cruisers, destroyers and other warships with key capabilities to determine if the electronic sensors of potential foes are tracking the ship.

SEWIP Block 2 will provide enhanced Electronic Support (ES) capability by means of an upgraded ES antenna, ES receiver and an open combat system interface for the AN/SLQ-32. These upgrades are necessary in order to pace the threat and improve detection and accuracy capabilities of the AN/SLQ-32

“The SEWIP Block 2 System is critically important to the Navy’s operation, and we are proud to continue to provide this capability to the warfighter,” said Joe Ottaviano, electronic warfare program director. “Threats are becoming increasingly sophisticated. Our electronic warfare systems give the warfighter information to enable a response before the adversary even knows we’re there.”

The Navy established SEWIP in 2002. Block 1 provided enhanced electronic warfare capabilities to existing and new ship combat systems to improve anti-ship missile defense, counter-targeting, and counter-surveillance capabilities. SEWIP allows sailors to protect the ship from the threats you can see (incoming missiles) to those you can’t (radar jamming).

The General Dynamics Advanced Information Systems’ AN/SSX-1 is an electronic warfare system that supports a variety of missions including maritime interdiction operations against weapon, chemical and drug smuggling. The AN/SSX-1 collects precision electronic parametric data and correlates it to specific transmissions from ships and aircraft searching for potential matches. It was designed for the US Navy’s Surface Electronic Warfare Improvement Program (SEWIP) which is an upgrade to the AN/SLQ-32 electronic warfare anti-ship missile defense system.

The US Navy in collaboration with Northrop Grumman successfully completed the preliminary design review (PDR) for the next-generation AN/SLQ-32 shipboard electronic warfare system.

Integrated Warfare Systems (PEO IWS) programme executive officer rear admiral Jon A Hill said: “This ensures that the cutting-edge preliminary design is on track to meet necessary technology improvements to the AN/SLQ-32 family of electronic warfare systems through specific enhancements to threat identification, prioritisation, defensive systems optimal assignment, and active engagement.”

The upgraded version of current AN/SLQ-32(V)6 systems will offer enhanced, fully integrated, threat detection and active radar-jamming capability, in addition to critical enhancements in coordinated electronic warfare defence.


Rheinmetall’s MASS

Rheinmetall has developed Multi Ammunition Softkill System, or MASS. supplied the MASS for the Royal Canadian Navy Halifax-class frigate upgrade program. To date, more than 200 MASS systems have been supplied to 14 nations on five continents, including 34 to Canada.

MASS is naval countermeasure system, protecting ships from most modern anti-ship-missiles as well as asymmetric threats in the littoral environment. To complete the defense of the full spectrum of naval Anti Air Warfare threats, MASS provides new capabilities as millimetre wave (MMW)-Decoy capability, MMW-Sensor SME100+ for MMW anti-ship missile detection as well as the off-board corner reflector.

Rheinmetall also offers the MASS variant MASS_ISS (ISS stands for “Integrated Sensor Suite”) that features integrated radar ESM systems and laser warning systems.

Threat analysis conducted by Rheinmetall shows that the threat to seagoing vessels in littoral waters from small weapons such as guided missiles (i.e. asymmetric threats) is basically undetectable using current shipboard sensor systems. In order to bridge this capability gap, Rheinmetall is cooperating with the Israeli company Elta to integrate its NavGuard technology into MASS. NavGuard is a radar-based projectile warning system capable of detecting even small incoming threats. MASS has already undergone successful live-fire testing in combination with NavGuard


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