Electronic countermeasure

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Inspecting an AN/ALQ-184 Electronic Attack Pod.

An electronic countermeasure (ECM) is an electrical or electronic device designed to

jamming. Self-protecting (defensive) ECM includes using blip enhancement and jamming of missile terminal homers
.

History

The first example of electronic countermeasures being applied in a combat situation took place during the

Port Arthur fortress and on board Russian light cruisers successfully interrupted wireless communication between a group of Japanese battleships. The spark-gap transmitters in the Russian stations generated senseless noise while the Japanese were making attempts to coordinate their efforts in the bombing of a Russian naval base. Germany and United Kingdom interfered with enemy communications along the western front during World War I while the Royal Navy tried to intercept German naval radio transmissions.[1] There were also efforts at sending false radio signals, having shore stations send transmissions using ships' call signs, and jamming enemy radio signals.[1] On the other hand, there were also attempts by the Ottoman side to jam Allied wireless communications during the Gallipoli campaign.[2]

World War II ECM expanded to include dropping chaff (originally called Window), jamming and spoofing radar and navigation signals.[1] German bomber aircraft navigated using radio signals transmitted from ground stations, which the British disrupted with spoofed signals in the Battle of the Beams. During the RAF's night attacks on Germany the extent of electronic countermeasures was much expanded, and a specialised organisation, No. 100 Group RAF, was formed to counter the increasing German night fighter force and radar defences. Cold War developments included anti-radiation missiles designed to home in on enemy radar transmitters.[1]

In the 2007

Israel Air Force used electronic warfare to take control of Syrian airspace prior to the attack.[3] Israeli electronic warfare (EW) systems took over Syria's air defense systems, feeding them a false sky-picture while Israel Air Force jets crossed much of Syria, bombed their targets and returned.[4]

Radar ECM

Main article: Radar jamming and deception
Simulated radar screen in US Navy training exercise showing simulated jamming (triangular white area lower right)

Basic radar ECM strategies are (1) radar interference, (2) target modifications, and (3) changing the electrical properties of air.

chaff is a common method of changing the electromagnetic properties of air to provide confusing radar echos.[1]

Communications ECM

Main article: Radio jamming
Drone counter measures (1st Squadron, 3rd Cavalry Regiment of the US Army drill with the Battelle DroneDefender, 30 October 2018, Iraq.)

Radio jamming or communications jamming is the deliberate transmission of radio signals that disrupt communications by decreasing the signal-to-noise ratio to the point where the target communications link is either degraded or denied service.

Aircraft ECM

German Tornado ECR

ECM is practiced by nearly all modern military units—land, sea or air. Aircraft, however, are the primary weapons in the ECM battle because they can "see" a larger patch of earth than a sea or land-based unit. When employed effectively, ECM can keep aircraft from being tracked by search radars, or targeted by surface-to-air missiles or air-to-air missiles. An aircraft ECM can take the form of an attachable underwing pod or could be embedded in the airframe. Fighter planes using a conventional electronically scanned antenna mount dedicated jamming pods instead or, in the case of the US, German, and Italian air forces, may rely on electronic warfare aircraft to carry them. ECM pods vary widely in power and capability; while many fighter aircraft are capable of carrying an ECM pod, these pods are generally less powerful, capable and of shorter range than the equipment carried by dedicated ECM aircraft, thus making dedicated ECM aircraft an important part of any airforce’s inventory.

Future airborne jammers

The Next Generation Jammer is being developed to replace the current AN/ALQ-99 carried on the E/A-18G electronic warfare plane. Planned for adoption around 2020, it will use a small AESA antenna divided into quadrants[5] for all around coverage and retain the capability of highly directional jamming.

DARPA's Precision Electronic Warfare (PREW) project aims to develop a low-cost system capable of synchronizing several simple airborne jamming pods with enough precision to replicate the directionality of an electronically scanned antenna, avoiding collateral jamming of non-targeted receivers.[6]

An expendable active decoy that uses

Gripen aircraft and the development of a 218 variant is at an advanced stage.[8]

Dedicated ECM aircraft

Shipboard ECM

The ULQ-6 deception transmitter was one of the earlier shipboard ECM installations.

Raytheon SLQ-32 shipboard ECM package came in three versions providing warning, identification and bearing information about radar-guided cruise missiles.[9] The SLQ-32 V3 included quick reaction electronic countermeasures for cruisers and large amphibious ships and auxiliaries in addition to the RBOC (Rapid Blooming Off-board Chaff) launchers found on most surface ships.[9] The BLR-14 Submarine Acoustic Warfare System (or SAWS) provides an integrated receiver, processor, display, and countermeasures launch system for submarines.[9]

Infrared and acoustic analogies

See also: Acoustic quieting
BAE Hot Brick infrared jammer

Infrared homing systems can be decoyed with flares[1] and other infrared countermeasures. Acoustic homing and detection systems used for ships are also susceptible to countermeasures. United States warships use Masker and PRAIRIE (propeller AIR Ingestion and Emission) systems to create small air bubbles around a ship's hull and wake to reduce sound transmission.[1] Surface ships tow noisemakers like the AN/SLQ-25 Nixie to decoy homing torpedoes.[1] Submarines can deploy similar acoustic device countermeasures (or ADCs) from a 3-inch (75-mm) signal launching tube.[1] United States ballistic missile submarines could deploy the Mark 70 MOSS (Mobile submarine simulator) decoy from torpedo tubes to simulate a full size submarine.[1] Most navies additionally equip ships with decoy launchers.[10]

See also

References

  1. ^ a b c d e f g h i j k l m n o p Polmar (1979), p. 121.
  2. ISBN 978-605-80897-7-8
    . Retrieved 6 December 2023.
  3. ^ [1] By YAAKOV KATZ, 09/29/2010, Jerusalem Post
  4. ^ Israel Shows Electronic Prowess Nov 26, 2007, David A. Fulghum and Robert Wall, Aviation Week & Space Technology
  5. ^ "IN FOCUS: US Navy Next Generation Jammer proceeds, but F-35 integration deferred indefinitely".
  6. ^ Broad Agency Announcement Precision Electronic Warfare (PREW) STRATEGIC TECHNOLOGY OFFICE DARPA-BAA 09-65
  7. ^ "New Selex ES expendable active decoy 'britecloud' selected by saab for gripen fighter – DETAIL – Leonardo". uk.leonardocompany.com. Archived from the original on 2016-08-16. Retrieved 2016-07-20.
  8. ^ "Finmeccanica – Selex Es to hold britecloud trials with Gripen – DETAIL – Leonardo". uk.leonardocompany.com. Archived from the original on 2016-08-16. Retrieved 2016-07-20.
  9. ^ a b c d e Polmar (1979), p. 122.
  10. ^ http://www.terma.com/media/118849/skws_022007.pdf Archived 2013-04-26 at the Wayback Machine [bare URL PDF]

Sources

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