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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Active jamming is of left-hand circular polarization with the transmitting power of 30 dBmW, and equivalent RCS of it is approximately five times as large as the boat's.
For typical radar targets, such as warships and aircrafts, it usually varies from 4 to 8; that of corner reflectors ranges from 7 to 9; that of active jamming with circular polarization approximates 1; that of active jamming with vertical polarization is more than 20; however, that of active jamming with horizontal polarization is less than 1/20.
Caption: Figure 6: Angle estimation of the target being interfered with by active jamming.
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.
The next active jamming system to fly on the F-16 - at long last - was the Northrop Grumman/ITT AN/ALQ-165 Advanced Self-Protection Jammer (ASPJ).
The ALQ-184 is the lead system in an effort to develop a database of test data for an active jamming system.
Of the cited user nations, Egypt has led the -21 upgrade effort with a program which included the introduction of the ALE-40 chaff/flare dispenser and an active jamming pod of Italian origin.
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.
At the same time, it will offer full integration of a warning subsystem covering radar frequency, millimeter-wave, infrared (IR) and laser threats with active jamming and expendables.
"With active jamming, passive location systems and antiradiation missile delivery ability, they either attacked enemy weapon systems or rendered them ineffective."

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