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Noise jamming is the form of electronic countermeasure where jammer transmit an interference signal ( white noise) in enemy’s radar direction so that the aircraft reflection is completely submerged by type of jamming is also called ‘denial jamming’ or ‘obscuration jamming’.

Non-Cooperative Target Recognition (NCTR ) techniques such as jet-engine modulation used by modern radar (most radars after 1980s) can distinguish decoys from real aircrafts. Against a conically scanning tracking radar, an inverse gain repeater jammer has the effect of causing positive feedback, which pushes the tracking radar antenna away from the target rather than toward the target.

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.…