In this type of system, each of the jamming antennas is acting as the signal source for a repeater- type jammer. In skirt jamming, the jammer exploits the phase response of filters in the radar receiver by injecting a strong jamming signal into a region just above or below the filter frequency.
Barrage jammers have to spread energy over a wide frequency spectrum ,so it is less effective again high power radar. Decoys are towed behind aircraft with a cable so they move at the same speed as parent aircraft, as a result, doppler effect does not help distinguish decoys from the real target.
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