active jamming


Also found in: Acronyms.

active jamming

[′ak·tiv ′jam·iŋ]
(electronics)

active jamming

Electronic countermeasures in which an attempt is made to mask or suppress the enemy's electromagnetic signals by high-powered radiation or re-radiation to impair the use of a specific band of frequencies. Self-protection jammers, stand-off jammers, and deception jammers are some of the devices used in active jamming. Self-protection jammers jam the radar receivers and thus make the task of detecting the target difficult. Stand-off jammers jam the enemy's receivers from a safe distance. Deception jammers try to confuse the radar receivers.
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Under pressure from advanced Soviet surface-to-air missiles (SAMs) and the McDonnell Douglas F/A-18 Hornet - designed from the outset with an internal active jamming system - the USAF and General Dynamics incorporated space for an active jammer in the first major revision of the design - the F-16C/D Block 25, which was delivered to the USAF from 1984 onwards.
Elta was Loral's in-country partner on the program, and the third batch of F-16Cs was fitted with the domestically produced Elta EL/L-8240 active jamming system.
Active jamming is provided by the Raytheon ALQ-187 internal wideband active EW system, derived from the podded ALQ-184, and the ASPIS also controls the Tracor ALE-47 countermeasures dispenser.
Vympel-R2: Combined "3-cm" naval EW suite (ESM, active jamming and decoy launcher control) for surface-ships of "less than 2,000 tons.
In the near term, both Greece and South Korea can be expected to make definitive choices concerning EW provision on their F-16s, while the Belgians are expected to issue a request for proposals sometime during the course of 1993 for an active jamming subsystem to complement the Carapace warning equipment already purchased.
With active jamming, passive location systems and antiradiation missile delivery ability, they either attacked enemy weapon systems or rendered them ineffective.
For IR threats, the ECU determines which countermeasure will be most effective and selects among the following options: active jamming, expendable dispensing or cooperative jamming and dispensing.
When the active jamming option is selected, the directable IR jammer transmitter (see "Why Directable Jammers?
As far as JED has been able to ascertain, the Falcon 20s are fitted with an internal electronic support measures (ESM)/ active jamming suite which uses predominantly Italian equipment.
The suite used comprises an internalized Lundy ALE-43 D-,E/F- and I-band chaff dispenser and an active jamming subsystem made up of Rockwell-Collins UST-104 (VHF/UHF communications), Rodale DLQ- 3C (I-band fire control/air intercept radars) and Hercules ALQ-176 (D-, E/F- and G-band surveillance radars) transmission units plus fore and aft radar receivers.

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